HomeMy WebLinkAbout3.3Item 3.3
TOWN OF LOS ALTOS HILLS March 3, 2011
Staff Report to the Planning Commission
SUBJECT: INITIAL STUDY AND NEGATIVE DECLARATION FOR THE LOS ALTOS
HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
FROM: Debbie Pedro, Planning Director
RECOMMENDATION: That the Planning Commission:
Review and forward a recommendation that, based on the Initial Study, the City Council adopt
the attached Mitigated Negative Declaration for the Los Altos Hills/Stanford Trail Improvement
project.
BACKGROUND
In February 2006, the Stanford University Board of Trustees and the County of Santa Clara
entered into a Trail Agreement that obligated Stanford to fund improvements to an existing trail
within the Town. On November 18, 2010, the City Council voted unanimously to pass
Resolution No. 61-10 approving the Agreement between Stanford and the Town regarding the
Trail Project. The Los Altos Hills/Stanford Trail Project includes the restoration and construction
of pathways and bike lanes that spans approximately one lineal mile. The Trail incorporates
existing paths and begins at the intersection of Arastradero and Purissima Roads, follows
Arastradero Road under I-280 westerly to Page Mill Road, then south along Page Mill Road to
the 'intersection of Baleri Ranch and Arastradero Roads.
M_1]i.04181*1416MIN
The proposed project includes three types of trail improvements:
1. Restoration of existing pathways. A number of Type 2B and native paths already exist
within the project area. These paths will be restored to the Town's pathways standards
and top dressed with gravel/quarry fines.
2. Construction of new pathways. All new paths will be constructed according to the
Town's Type 2B Roadside Path requirements including:
• 5 -feet width with 2 -feet wide shoulders where possible
• Surface, 6 -inches of Stevens Creek Quarry Crusher Fines
• 2 -inch x 6 -inch wood headers where necessary
New paths to be constructed include an approximately 445 foot long section along
Arastradero Road that begins at Stirrup Way. This section will require the construction of
a concrete retaining .wall of up to 8' to allow edge widening for the new path. The
L9
Staff Report to the Planning Commission
Los Altos Hills/Stanford Trail Project
March 3, 2011
Page 2 of 3
retaining wall will have a simulated natural stone finish. At this wall location, a second,
native path will be constructed at the top of the adjacent slope.
In addition, an approximately 70 foot long pre -fabricated pedestrian and equestrian
bridge will be installed at the trail crossing at Matadero Creek near Baleri Ranch Road.
3. Bike lanes striping and road widening. Bike lanes will be striped on existing asphaltic
concrete ("AC") paved roadways. In some areas the existing AC surface will require edge
widening to accommodate the bike lanes. The bike lanes on Arastradero from Purissima
to Page Mill Road, and on Page Mill to Berry Hill Court will be constructed in a Class II
configuration (separate, striped lanes in both directions). Portions of the roadway along
the stretch of Arastradero Road between Stirrup Way and the Park and Ride lot will be
widened by 3'-5'.
On Page Mill between Berry Hill and Baleri Ranch Roads, the bike lanes will be Class III
(bikes merge with vehicular traffic in both directions). No road widening is proposed for
this area. On Arastradero Road from Liddicoat Drive to Tracy Court, the roadway on the
south side of Arastradero will be widened by 6"-18".
Tree Removal
Thirteen trees are proposed to be removed as part of this construction project. They include three
Eucalyptus trees on the west side of Arastradero (east of Page Mill Road) to accommodate the
eastbound bike lanes, seven Coast live oaks on Arastradero Road at Stirrup Way to
accommodate the new retaining wall and bike lane, one Peruvian pepper tree west of the
retaining wall to accommodate slope improvements, and two Coast live oaks adjacent to
Matadero Creek near Baleri Ranch Road to accommodate path improvements. No heritage oak
trees (oaks over 12" in trunk diameter) are.proposed to be removed.
Environmental Review
In conformance with the California Environmental Quality Act (CEQA), staff has prepared an
Initial Study/Mitigated Negative Declaration for the project. The Initial Study identified potential
impacts relating to air quality, biological resources, cultural resources, and hydrology and water
quality. Based on the analysis contained in the study, these impacts will be reduced to a less than
significant level with mitigation. A detailed analysis of the potential impacts and mitigation
measures are discussed in the Initial Study. (Attachment 1)
A Notice of Intent to adopt a Mitigated Negative Declaration was published in the Town Crier on
February 9, 2011. The notice was also submitted to the Santa Clara County Clerks Office for a
30 day public review period which began on February 17 and will end on March 17, 2011.
As of this date, the Town has received written comments from resident Edwina Cioffi expressing
concerns about the project's safety impacts on local residents and environmental impacts on
animals including deer and rabbits. (Attachment 3)
Staff Report to the Planning Commission
Los Altos Hills/Stanford Trail Project
March 3, 2011
Page 3 of 3
CONCLUSION
The Trail improvement project will provide a safe and convenient pedestrian/equestrian/bicycle
connection between the residential neighborhoods to the north and south of I-280. The proposed
project is consistent with the Town of Los Altos Hills General Plan Pathways Element (2008)
and Open Space and Recreation Element (2007). The proposed project will be designed and
constructed in compliance with the Town of Los Altos Hills Municipal Code. The project is
designed to accommodate non -motorized modes of travel, including biking, horseback riding,
jogging, hiking and walking.
Based on the Initial Study, staff concluded that the proposed project, as mitigated, will not have a
significant effect on the environment. The Negative Declaration identifies specific mitigation
measures intended to mitigate for any potential significant environmental impacts as described in
the Initial Study. The Initial Study and Negative Declaration are included in this report.
ATTACHMENTS
1. Initial Study/Negative Declaration
2. Biological Assessment prepared by Coast Ridge Ecology
3. Email from Edwina Cioffi, 14250 Baleri Ranch Road, dated February 24, 2011
4. Project plans
3
Attachment 1
NOTICE
Town of Los Altos Bills
Mitigated Negative Declaration
Lead Agency: Town of Los Altos Hills
Planning Department
263 79 Fremont Road
Los Altos Hills, CA 94022
Project Title: Los Altos Hills/Stanford Trail Improvement Project
Location: Arastradero Road and Page Mill Road between Purissma Road and Baleri Ranch
Road.
Project Description: The Los Altos Hills/Stanford Trail Improvement Project includes the construction
of walking paths, bike lanes, a free -span pedestrian bridge across Matadero Creek, and a retaining wall
along Arastradero Road to accommodate a walking path and edge widening for bike lane improvements.
The improvements begin at the intersection of Arastradero Road and Purissima Roads; continue along
Arastradero Road under the I-280 freeway to Page Mill Road and along Page Mill Road near the
intersection of Baleri Ranch Road/Arastradero Road at the proposed bridge crossing of Matadero Creek.
Bike lane improvements continue along Arastradero Road to the Enid W. Pearson Arastradero Preserve
(Palo Alto Open Space) property line. The trail alignment is located within existing Town of Los Altos
Hills pedestrian and equestrian trail easements and road right-of-way, with the exception of one location
near Baleri Ranch Road where realignment of the existing easement is required for the bridge crossing.
The project site encompasses approximately one lineal mile, incorporating existing trails and bike lanes
where possible.
Finding: Although the proposed project could have a significant effect on the environment, there will not
be a significant effect in this case because the mitigation measures listed below have been added to the
project, mitigating potential impacts to a less -than -significant level. An Environmental Impact Report
will not be required.
Mitigation Measures:
1. Aesthetics: None required.
2. Agriculture Resources:. None required.
3. Air Quality:
AIR -1 Bay Area Air Quality Management District (BAAQMD) dust control measures will be
incorporated into Final Improvements Plans/Grading Plans and will be adhered to during
construction for all improvements including the following.
a. All exposed surfaces (e.g., parking areas, staging areas, soil piles, graded areas, and unpaved
access roads) shall be watered two times per day.
JANUARY, 2011
MITIGATED NEGATIVE DECLARATION — Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
b. - All haul trucks transporting soil, sand or other loose material off-site shall be covered.
c. All visible mud or dirt track -out onto adjacent public roads shall be removed using wet
power vacuum street sweepers at least once per day. The use of dry power sweeping is
prohibited.
d. All vehicle speeds on unpaved roads shall be limited to 15 mph.
e. All roadways, driveways, and sidewalks to be paved shall be completed as soon as possible.
f. Idling times shall be minimized either by shutting equipment off when not in use or reducing
the maximum idling time to 5 minutes (as required by the California airborne toxics control
measure Title 13, Section 2485 of California Code of Regulations {CCR}). Clear signage
shall be provided for construction workers at all access points.
4. Biological Resources:
BIO -1 All ground disturbance associated with trail building activities on site will be conducted during
the dry season (April 15 — October 15).
BIO -2 Staging areas and access routes to the work area will be delineated and inspected by the project
biologist prior to establishment to avoid unnecessary impacts to California red -legged frogs and
their habitat. -
BIO -3 Exclusion fencing will be erected around portions of the construction site adjacent to Matadero
Creek and Deer Creek prior to the onset of project activities. Fencing will be a minimum of 3 feet
in height and buried in the soil 4 to 6 inches to inhibit California red -legged frogs from entering
the project area.
BIO -4 Once the exclusion fence is installed, a pre -construction survey will be conducted to ensure that
no California red -legged frogs are present in the project area.
BIO -5 If California red -legged frogs are detected on site, the USFWS would be contacted for guidance
on moving the animal(s) to a safe location. No CRF would be handled without permission from
the USFWS.
BIO -6 During project activities, all trash that may attract predators will be properly contained, removed
from the work site and disposed of regularly. Following construction, all trash and construction
debris will be removed from work areas.
BIO -7 All practicable erosion control Best Management Practices (BMPs) will be implemented to
minimize the potential of impacts to water quality of Matadero Creek and Deer Creek.
BIO -8 No smoking except in vehicles will be permitted within vegetated areas.
BIO -9 Trash dumping will be prohibited.
BIO -10 Woodrat nests within 100 feet of ground disturbing activities shall be surveyed and monitored to
determine if nests are active.
FEBRUARY, 2011 2
MITIGATED NEGATIVE DECLARATION — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
BIO -11 For woodrat nests that can be avoided, orange construction/ protective fencing will be placed
between work areas and woodrat nests, and will include a 2 -foot buffer between the protective
fencing and the nest.
BIO -12 For woodrat nests that cannot be avoided, woodrat nests shall be dismantled by a qualified
biologist. Dismantling will be conducted during the time of year that would least impact breeding
woodrats (i.e. late fall/ winter: November/December/January). Dismantling will be conducted
slowly to avoid impacting neonate woodrats. If woodrat neonates are detected in the nest,
dismantling will cease and the nests will be checked every 48 hours to determine if the neonates
are still present. Dismantling will continue once it is determined that the neonates are no longer
present and have either been weaned from their mothers, or the mothers have moved them from
the nest.
BIO -13 DFG shall be consulted if any San Francisco dusky -footed woodrats (adults, subadults or
neonates) are harmed by project activities.
BIO -14 If ground disturbance activities are proposed during the bird nesting season (February 1— August
31), then preconstruction surveys for nesting birds including raptors such as white-tailed kite and
Cooper's hawk, shall be conducted by a qualified biologist within 300 feet of the construction
area, where access is available, within two weeks prior to construction.
BIO -15 If active bird nests are found, and project activities could potentially impact nesting success,
appropriate no -activity buffer zones shall be established around active nest (s). Typical iso-
activity buffer zones are 300 feet for active raptor nests. If project activities would be conducted
within these buffer zones, the US Fish and Wildlife Service Migratory Bird Treaty Office and the
Department of Fish and Game will be consulted for guidance and all necessary permits would be
obtained.
BIO -16 If ground disturbance activities are proposed during the bird nesting season (February 1 — August
31), then preconstruction surveys for migratory birds, shall be conducted by a qualified biologist.
For migratory raptors including red-tailed hawk, surveys shall be conducted within 300 feet of
the project area where access is available. For non -raptor migratory bird species, surveys shall be
conducted within 100 feet of the project area, where access is available. Surveys for migratory
birds shall be conducted within two weeks prior to any ground disturbance, tree removal and/or
tree pruning activities within the project area.
BIO -17 If active bird nests are found, and project activities could potentially impact nesting success,
appropriate no -activity buffer zones shall be established around active nest (s). Typical iso-
activity buffer zones are 300 feet for active raptor nests, and 100 feet for active migratory bird
nests. If project activities would be conducted within these buffer zones, the US Fish and
Wildlife Service Migratory Bird Treaty Office and the Department of Fish and Game will be
consulted for guidance and all necessary permits would be obtained.
BIO -18 To avoid impacts to roosting bats within the project area, including pallid bat and western red
bat, pre -construction surveys for roosting bats shall be conducted by a qualified bat biologist
within two weeks prior to any ground disturbance, tree removal and/or tree pruning activities
within the project area. Any tree removal on site shall be done according to the recommendations
of the qualified bat biologist. If active bat maternity roosts are detected (this season is typically
between April and August) within a structure or tree that will be impacted by the project, the
FEBRUARY, 2011 3
MITIGATED NEGATIVE DECLARATION — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
roost would need to be avoided until all young are volant, and the Department of Fish and Game
will be consulted for permission in the use of any bat exclusion devices.
BIO -19 To avoid impacts to special status plant species, (San Francisco collinsia and western
leatherwood), one or more preconstruction surveys shall be conducted by a qualified biologist
prior to any ground disturbance and/or vegetation removal within the project area. The survey (s)
should be timed to occur at the most suitable time of year (i.e. bloom period) to detect San
Francisco collinsia and western leatherwood.
BIO -20 If San Francisco collinsia and/or western leatherwood are identified within the project area, and
one or more individual plants could potentially be impacted by project activities, the California
Native Plant Society and the Department of Fish and Game will be consulted to develop
appropriate mitigation measures. Mitigation measures may include seed/plant material collection,
propagation and replanting in an appropriate restoration area(s).
BIO -21 Under no circumstances shall spoils, gravel, paving materials or other construction materials or
debris be placed, even temporarily, along or below the top of bank of the creek.
BIO -22 Best Management Practices (BMPs) to prevent pollutants, construction materials or debris from
entering the creek and storm drains shall be installed prior to the initiation of work and properly
maintained. For further clarification refer to Hydrology and Water Quality Mitigation Measure
HYD -5.
BIO -23 The project proponent shall avoid planting ornamental species reported by the California
Invasive Plant Council to have the potential to be invasive. Species on this list shall be
prohibited from use in landscaping.
6. Cultural Resources:
CUL -1 In the event that archaeological traces are encountered, all construction within a 50 -meter radius
of the find will be halted, the Planning Director will be notified, and an archaeologist will be
retained to examine the find and make appropriate recommendations.
CUL - 2If human remains are discovered, the Santa Clara County Coroner will be notified. The Coroner
will determine whether or not the remains are Native American. If the Coroner determines that
the remains are not subject to his authority, he will notify the Native American Heritage
Commission, who shall attempt to identify descendants of the deceased Native Americans.
CUL - 3If the Planning Director finds that the archaeological find is not a significant resource, work will
resume only after the submittal of a preliminary archaeological report and after provisions for
reburial and ongoing monitoring are accepted. Provisions for identifying descendants of a
deceased Native American and for reburial will follow the protocol set forth in CEQA
Guidelines Section 15064.5(e). If the site is found to be a significant archaeological site, a
mitigation program will be prepared and submitted to the Planning Director for consideration and
approval, in conformance with the protocol set forth in Public Resources Code Section 21083.2.
CUL 4 A final report shall be prepared when a find is determined to be a significant archaeological site,
and/or when Native American remains are found on the site. The final report will include
background information on the completed work, a description and list of identified resources, the
FEBRUARY, 2011 4
MITIGATED NEGATIVE DECLARATION - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
disposition and curation of these resources, any testing, other recovered information, and
conclusions.
7. Geology and Soils: None required.
8. Greenhouse Gases: Refer to Air Quality Mitigation Measure AIR -la. through if
9. Hazards and Hazardous Materials: None required.
10. Hydrology and Water Quality:
HYD -1 A hydraulic analysis shall be completed prior to final bridge design, to calculate peak discharges
for existing and post -project conditions on the site using the Santa Clara Valley Water District
procedures for flood discharge estimation to assess the conveyance area of Matadero Creek and
ensure that bridge construction will not encroach into the conveyance area of the creek and will
not impede or redirect flows in the event of a 100 -year flood.
HYD -2 Obtain permits for the proposed free span pedestrian bridge from the California Department of
Fish and Game and Santa Clara Valley Water District prior to issuance of a grading permit.
HYD — 3 Re -vegetate disturbed areas with watershed native riparian plant species immediately following
construction.
HYD — 4 Erosion and sedimentation control measures, such as silt fencing and use of straw wattles, shall
be implemented during and after construction.
HYD — 5 Prepare a Storm Water Pollution Prevention Plan (SWPPP) incorporating the following Best
Management Practices (BMPs) into grading and construction plans to prevent inadvertent
discharge of materials into Matadero Creek in compliance with the National Pollutant Discharge
Elimination System (NPDES) permit.
a. The contractor will identify and implement specific procedures for the handling
and containment of hazardous materials. This will include establishing dedicated
fueling and maintenance areas for construction vehicles and equipment
(including small equipment such as chainsaws), which will be located at least 65
feet from any drainage, riparian habitat or water body. Fueling must be
performed on level ground.
b. The contractor will identify and implement as appropriate specific procedures
for handling and containment of hazardous materials. These will include catch
basins for refueling and having absorbent pads on hand to respond to accidental
spills.
c. Absorbent spill clean-up materials and spill kits shall be available in fueling
areas and on fueling trucks and shall be disposed of properly after use.
d. Drip pans or absorbent pads shall be used during vehicle and equipment fueling,
unless the fueling is performed over an impermeable surface in a dedicated
fueling area.
e. Fuel tanks shall not be "topped -off'
FEBRUARY, 2011 5
MITIGATED NEGATIVE DECLARATION — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
f. Vehicles and equipment shall be inspected on each day for evidence of leaks.
Leaks shall be repaired immediately or problem vehicles or equipment shall be
removed from the project site.
g. Absorbent spill clean-up materials shall be available in fueling and maintenance
areas and used on small spills instead of hosing down or burying techniques. The
spent absorbent material shall be removed promptly and disposed of properly. .
HYD — 6 The construction plans shall clearly identify all proposed fueling, cleaning or maintenance
areas in accordance with the following:
h. No fueling, cleaning, or maintenance of vehicles or equipment shall take place
within the riparian corridor to avoid the release of deleterious substances into
surface waters.
i. During construction, there will be no use of pesticides for maintenance, or
dumping of waste or refuse.
j. Equipment cleaning and temporary concrete washout area shall comply with the
following:
i. Location of temporary concrete washout facilities will be identified at
least 24 hours prior to a scheduled pour.
ii. Temporary concrete washout facilities, cleaning stations, and staging
areas shall be located on. level ground at least 200 feet from channel
banks. Each facility shall be located away from construction traffic or
access areas to prevent disturbance or tracking.
iii. Temporary concrete washout facilities shall be constructed and
maintained to sufficiently maintain all liquid and concrete wastes
generated by washout operations.
iv. Once concrete wastes are washed into the designated area and allowed to
harden, the concrete shall be broken up, removed and properly disposed
of.
11. Land Use and Planning: None required.
12. Mineral Resources: None required.
13. Noise: None required.
14. Population and Housing: None required.
15. Public Services: None required.
16. Recreation: None required.
17. Transportation and Traffic: None required.
FEBRUARY,2011 6
MITIGATED NEGATIVE DECLARATION — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
18. Utilities and Service Systems: None required.
Copies of the Initial Study used to make the above recommendation are on file and available for public
inspection during regular business hours at the Town Planning Department, 26379 Fremont Road, Los
Altos, California.
Date Debbie Pedro, AICP, Planning Director
FEBRUARY,2011
I
ADMINISTRATIVE DRAFT
INITIAL STUDY
LOS ALTOS HILLS/STANFORD
TRAIL IMPROVEMENT PROJECT
LOS ALTOS HILLS, CALIFORNIA
TRAIL AND BIKE LANE IMPROVEMENTS AT ARASTRADERO AND PAGE MILL ROADS
PREPARED FOR
TowN OF Los ALTOS HILLS
PLANNING DEPARTMENT
26379 FREMONT ROAD
Los ALTOS HILLS, CA 94022
FEBRUARY 2011
METROPOLITAN PLANNING GROUP, INC.
579 CLYDE AVENUE #340
MOUNTAIN VIEW, CA 94043
(650) 938-1111
FEBRUARY, 2011 1
INITIAL STUDY- LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
TOWN OF Los ALTOS HILLS
PLANNING DEPARTMENT
ENVIRONMENTAL CHECKLIST FORM
PROJECT INFORMATION
PROJECT TITLE:
Los Altos Hills/Stanford Trail Improvement
Project
LEAD AGENCY NAME AND ADDRESS:
Town of Los Altos Hills
Planning Department
26379 Fremont Road
Los Altos Hills, CA 94022
PROPERTY OWNER:
Various
GENERAL PLAN DESIGNATION:
Residential and Open Space Conservation
Area
PROJECT DESCRIPTION
PROJECT LOCATION:
Arastradero Road and Page Mill Road between
Purissima Road and Baleri Ranch Road.
(Figure 1)
CONTACT PERSON AND PHONE NUMBER:
Debbie Pedro AICP, LEED AP
Planning Director
Town of Los Altos'Hills
(650) 947-2517
PROJECT APPLICANT:
Town of Los Altos Hills
ZONING:
Residential -Agricultural (R -A)
The Los Altos Hills/Stanford Trail Improvement Project includes the construction of walking paths, bike
lanes, a free -span pedestrian bridge across Matadero Creek, and a retaining wall along Arastradero Road
to accommodate a walking path and edge widening for bike lane improvements. The improvements begin
at the intersection of Arastradero Road and Purissima Roads; continue along Arastradero Road under the
I-280 freeway to Page Mill Road and along Page Mill Road near the intersection of Baleri Ranch
Road/Arastradero Road at the proposed bridge crossing of Matadero Creek. Bike lane improvements
continue along Arastradero Road to the Enid W. Pearson Arastradero Preserve (Palo Alto Open Space)
property line. The trail alignment is located within existing Town of Los Altos Hills pedestrian and
equestrian trail easements and road right-of-way, with the exception of one location near Baleri Ranch
Road where realignment of the existing easement is required for the bridge crossing. The project site
encompasses approximately one lineal mile, incorporating existing trails and bike lanes where possible.
The proposed trails will be constructed consistent with the Town's Type 2B Roadside Path requirements,
including:
5 -feet width with 2 -feet wide shoulders where possible
Surface, 6 -inches of Stevens Creek Quarry Crusher Fines
2 -inch x 6 -inch wood headers where necessary
FEBRUARY 2011 2
INITIAL STUDY — Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
The bike lanes will be striped on existing asphaltic concrete ("AC") paved roadways. In some areas the
existing AC surface will require edge widening to accommodate the bike lanes. The bike lanes on
Arastradero from Purissima to Page Mill Road, and on Page Mill to Berry Hill Court will be constructed
in a Class 11 configuration (separate, striped lanes in both directions).
On Page Mill between Berry Hill and Baleri Ranch Road, the bike lanes will be Class III (bikes merge
with vehicular traffic in both directions). Appropriate striping and signage will be included throughout
the Project.
The Project includes an approximately 445 -foot -long, eight -foot -high (maximum height), concrete
retaining wall on the south side of Arastradero Road, west of Stirrup Way. The wall is necessary to
support cut slopes to allow pathway and edge widening to accommodate the new bike lane. The retaining
wall will have a simulated natural stone finish. At this wall location, there will be two trails; one a Type
2B roadside path at the base of the wall and a second path at the top of the adjacent slope. This second
path will be four -feet wide and have a native soil wearing surface.
The trail crossing at Matadero Creek near Baleri Ranch Road will be accomplished by installing an
approximately 70 foot long pre -fabricated free -span (abutments located outside of the creek banks)
pedestrian and equestrian bridge.
Intersection safety improvements and restriping at the Page Mill Road/Baleri Ranch-Arastradero
(including in -pavement lighting at the crosswalk), Page Mill Road/Berry Hill Court, and Arastradero
Road/Stirrup Way intersections will be completed to accommodate pedestrians.
Thirteen trees will require removal to accommodate project construction. They include three Eucalyptus
trees on the west side of Arastradero (east of Page Mill Road) to accommodate the eastbound bike lanes;
seven Coast live oaks, on Arastradero Road at Stirrup Way to accommodate the new retaining wall and
bike lane, 1 Peruvian pepper tree west of the retaining wall to accommodate slope improvements, and 2
Coast live oaks trees adjacent to Matadero Creek near Baleri Ranch Road to accommodate path
improvements.
BACKGROUND
In February 2006, the Board of Trustees of Leland Stanford Junior University and the County of Santa
Clara entered into an Agreement for Trail Easements, Construction, Management and Maintenance and
Grant of Trail Easements. This Trail Agreement obligated Stanford to offer to fund improvements to an
existing trail within the Town of Los Altos Hills, identified as the C-2 Trail in the Santa Clara
Countywide Trails Master Plan.
PURPOSE OF THE PROJECT
The purpose of the project is to provide a safe and convenient pedestrian/bicycle connection between the
residential neighborhoods to the north and south of I-280. The proposed trail connection would improve
the network of pedestrian and bike facilities, providing additional opportunities for recreation. The
proposed project is consistent with the Town of Los Altos Hills General Plan Pathways Element (2008)
and Open Space and Recreation Element (2007). The proposed project will be designed and constructed
in compliance with the Town of Los Altos Hills Municipal Code. The project is designed to accommodate
non -motorized modes of travel, including biking, horseback riding, jogging, hiking and walking.
VEGETATION REMOVAL
The vegetation within the proposed walking path alignment consists primarily of California Annual
Grassland, Central Coast Riparian Scrub and suburban forest. The project includes the removal of thirteen
FEBRUARY 2011
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
trees. Minor tree trimming and removal of low-lying vegetation may also be required to accommodate the
proposed walking path and bike lanes. As described in the Biological Resources section, potential impacts
to regulated waters, special status species and special status communities resulting from project
construction activities can be avoided or mitigated to a less than significant level. Santa Clara Valley
Water Resources Protection Collaborative Guidelines and Standards for Land Uses Near Streams will be
implemented to further minimize impacts to water quality, wildlife, and vegetation.
GRADING AND DRAINAGE
Substantial grading will not be required to construct the proposed project. A moderate amount of cut will
be required for construction of the retaining wall along Arastradero Road to accommodate a walking path
and new bike lane. Any other disturbed slopes along the creek corridor will be reseeded or replanted after
construction in accordance with the Santa Clara Valley Water Resources Protection Collaborative
"Guidance for Trail Design" in Guidelines and Standards for Land Uses Near Streams.
CONSTRUCTION INFORMATION
All construction work and equipment staging would occur within Los Altos Hills, Cal Trans, and Santa
Clara County road right-of-way, or Town easements. Equipment would be staged on previously disturbed
land to the extent feasible. No work would be required within the active stream (low -flow) channel of
Matadero Creek. It is anticipated that project construction would start in the summer of 2011. The total
duration of project construction is estimated to be approximately six months.
FEBRUARY 2011 4
LOS ALTOS HILLS TRAIL (C2)
SEGMENTS A -K
LOS ALTOS HILLS, CALIFORNIA
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0
INITIAL STUDY — LOS ALTOs HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
SURROUNDING LAND USES AND SETTING
The project site is comprised of approximately one lineal mile of trail and bicycle path improvements
located off Page Mill Road and Arastradero Road along Matadero Creek near the intersection with the I-
280 freeway. The project site is currently developed with asphaltic concrete (AC) road surfaces, existing
bike lanes and both improved and unimproved trails along the length of the project site. The site is
surrounded by residential development, property owned by Santa Clara Valley Water District north of
Baleri Ranch Road, Caltrans right of way and a Park and Ride lot at the intersection of Arastradero and
Page Mill Roads (Santa Clara County maintained), and the I-280 freeway.
OTHER AGENCIES WHOSE APPROVAL IS REQUIRED (e.g. permits, financing approval,
or participation agreement)
Construction of the bridge and trails within the Matadero Creek corridor would require a Streambed
Alteration Agreement from the California Department of Fish and Game and permits from the Santa
Clara Valley Water District.
Removal of trees within the County road right-of-way would be subject to requirements of the Santa
Clara County Department of Roads and Airports for tree removal. Construction of the bike lanes would
require an encroachment permit from the Santa Clara County Department of Roads and Airports, and
Caltrans District 4.
USE OF THE INITIAL STUDY
This Initial Study will be used to obtain a Mitigated Negative Declaration (MND) for the project, which
determines that with the implementation of the mitigation measures identified, that the project would not
have a significant effect on the environment.
ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED:
The environmental factors checked below would be potentially affected by this project, involving at least
one impact that is a "Potentially Significant Impact" as indicated by the checklist on the following pages:
FEBRUARY 2011 7
Aesthetics
Agriculture Resources
X
Air Quality
X
Biological Resources
X
Cultural Resources
Geology/Soils
X
Greenhouse Gases
Hazards & Hazardous
Materials
X
Hydrology/Water Quality
Land Use/Planning
Mineral Resources
Noise
Population/Housing
Public Services
Recreation
Transportation/Traffic
Utilities/Service Systems
Mandatory Findings of
Significance
FEBRUARY 2011 7
INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DETERMINATION: (TO BE COMPLETED BY THE LEAD AGENCY)
On the basis of this initial evaluation:
Debbie Pedro AICP, LEED AP, Planning Director, Los Altos Hills Date
FEBRUARY 2011
I find that the proposed project COULD NOT have a significant effect on the environment, and
a NEGATIVE DECLARATION will be prepared.
X
I find that although the proposed project could have a significant effect on the environment,
there will not be a significant effect in this case because revisions in the project have been
made by or agreed to by the project proponent. A MITIGATED NEGATIVE
DECLARATION will be prepared.
I find that the proposed project MAY have a significant effect.on the environment, and an
ENVIRONMENTAL IMPACT REPORT is required.
I find that the proposed project MAY have a "potentially significant impact" or "potentially
significant unless mitigated" impact on the environment, but at least one effect 1) has been
adequately analyzed in an earlier document pursuant to applicable legal standards, and 2) has
been addressed by mitigation measures based on the earlier analysis as described on attached
sheets. An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the
effects that remain to be addressed.
I find that although the proposed project could have a significant effect on the environment,
because all potentially significant effects (a) have been analyzed adequately in an earlier EIR
or NEGATIVE DECLARATION pursuant to applicable standards, and (b) have been avoided
or mitigated pursuant to that earlier EIR or NEGATIVE DECLARATION, including revisions
or mitigation measures that are imposed upon the proposed project, nothing further is required.
Debbie Pedro AICP, LEED AP, Planning Director, Los Altos Hills Date
FEBRUARY 2011
INITIAL STUDY—LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
EVALUATION OF ENVIRONMENTAL IMPACTS
Issues:
DISCUSSION:
The project entails development of trails and bike lanes with associated site improvements including an
approximately 70 foot long free -span pedestrian bridge and an approximately 445 foot long (maximum
eight foot high) retaining wall located within existing Town pedestrian and equestrian trail easements.
Several trees would be removed from the area south of Arastradero Road to accommodate the retaining
wall and bike lane improvements. These trees include three Eucalyptus trees, nine Coast live oak trees,
and one Peruvian Pepper tree. None of the trees proposed for removal are considered heritage oak trees as
defined by Town Municipal Code regulations. Three large eucalyptus trees that are visible from I-280
would be removed. However these trees are not protected by Town Code regulations and are not visually
prominent or distinctive trees. Two of these eucalyptus trees, identified as tree #21 and #22, appear to
straddle the Town and County boundary line and may be subject to County tree removal requirements.
Three young coast live oak trees, in the vicinity of two of the eucalyptus trees, have recently been planted
and appear to have established themselves. Over the next several years these oak trees will mature and
contribute to the aesthetic quality of this stretch of roadway. The majority of trees in the project site
would remain.
As proposed the project meets all Town Municipal Code requirements for construction and is in
conformance with all General Plan policies. The project would have a less than significant impact and
would not substantially degrade the existing visual character of the site or surroundings.
MITIGATION: None required.
FEBRUARY 2011 9
Potentially
Significant
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Potentially
Mitigation
Significant
No
Significant
Incorporated
Impact
Impact
Impact
1. Aesthetics - Would the project:
a) Have a substantial adverse effect on a scenic vista?
X
b) Substantially damage scenic resources, including, but not
X
limited to, trees, rock outcroppings, and historic buildings
within a state scenic highway?
c) Substantially degrade the existing visual character or
X
quality of the site and its surroundings?
d) Create a new source of substantial light or glare which
X
would adversely affect day or nighttime views in the area?
DISCUSSION:
The project entails development of trails and bike lanes with associated site improvements including an
approximately 70 foot long free -span pedestrian bridge and an approximately 445 foot long (maximum
eight foot high) retaining wall located within existing Town pedestrian and equestrian trail easements.
Several trees would be removed from the area south of Arastradero Road to accommodate the retaining
wall and bike lane improvements. These trees include three Eucalyptus trees, nine Coast live oak trees,
and one Peruvian Pepper tree. None of the trees proposed for removal are considered heritage oak trees as
defined by Town Municipal Code regulations. Three large eucalyptus trees that are visible from I-280
would be removed. However these trees are not protected by Town Code regulations and are not visually
prominent or distinctive trees. Two of these eucalyptus trees, identified as tree #21 and #22, appear to
straddle the Town and County boundary line and may be subject to County tree removal requirements.
Three young coast live oak trees, in the vicinity of two of the eucalyptus trees, have recently been planted
and appear to have established themselves. Over the next several years these oak trees will mature and
contribute to the aesthetic quality of this stretch of roadway. The majority of trees in the project site
would remain.
As proposed the project meets all Town Municipal Code requirements for construction and is in
conformance with all General Plan policies. The project would have a less than significant impact and
would not substantially degrade the existing visual character of the site or surroundings.
MITIGATION: None required.
FEBRUARY 2011 9
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The project site is within an existing urban area zoned for residential and related uses. The site is not
classified a prime farmland, under Williamson Act contract, or designated as forest land. The project site
area is not presently utilized for any agricultural purposes. Development'of the proposed project would
cause no impact to agricultural resources.
NIITIGATION: None required.
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
2. Agriculture Resources - Would the project:
a) Convert Prime Farmland, Unique Farmland, or Farmland
X
of Statewide Importance (Farmland), as shown on the maps
X
prepared pursuant to the Farmland Mapping and
X
Monitoring Program of the California Resources Agency,
to non-agricultural use?
X
b) Conflict with existing zoning for agricultural use, or a
X
Williamson Act contract?
c) Involve other changes in the existing environment which,
X
due to their location or nature, could result in conversion of
Farmland, to non-agricultural use?
X
DISCUSSION
The project site is within an existing urban area zoned for residential and related uses. The site is not
classified a prime farmland, under Williamson Act contract, or designated as forest land. The project site
area is not presently utilized for any agricultural purposes. Development'of the proposed project would
cause no impact to agricultural resources.
NIITIGATION: None required.
FEBRUARY 2011 10
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
3. Air Quality - Would the project:
a) Conflict with or obstruct implementation of the applicable
X
air quality plan?
b) Violate any air quality standard or contribute substantially
X
to an existing or projected air quality violation?
c) Result in a cumulatively considerable net increase of any
X
criteria pollutant for which the project region is non -
attainment under an applicable federal or state ambient air
quality standard (including releasing emissions, which
exceed quantitative thresholds for ozone precursors)?
d) Expose sensitive receptors to substantial pollutant
X
concentrations?
FEBRUARY 2011 10
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The project entails development of trails and bike lanes with associated site improvements including an
approximately 70 foot long free -span pedestrian bridge, and an approximately 445 foot long (maximum
eight foot high) retaining wall, located within existing Town pedestrian and equestrian trail easements.
Project construction and grading activities would generate short-term emissions of criteria pollutants,
including suspended and inhalable particulate matter (airborne dust) and equipment exhaust emissions
and could be considered a potentially significant impact to neighboring residences and construction
workers on a temporary and localized basis. Standard dust control measures, as stipulated by the Air
Quality Management District (BAAQMD), will be used which will ensure that any air quality impacts
remain insignificant. Therefore the impact of grading activities on air quality or sensitive receptors for the
proposed improvements would be considered potentially significant impact and the following mitigation
measures will be required.
MITIGATION:
AIR -1 Bay Area Air Quality Management District (BAAQMD) dust control measures will be
incorporated into Final Improvements Plans/Grading Plans and will be adhered to during
construction for all improvements including the following.
a. All exposed surfaces (e.g., parking areas, staging areas, soil piles, graded areas, and unpaved
access roads) shall be watered two times per day.
b. All haul trucks transporting soil, sand or other loose material off-site shall be covered.
c. All visible mud or dirt track -out onto adjacent public roads shall be removed using wet power
vacuum street sweepers at least once per day. The use of dry power sweeping is prohibited.
d. All vehicle speeds on unpaved roads shall be limited to 15 mph.
e. All roadways, driveways, and sidewalks to be paved shall be completed as soon as possible.
f. Idling times shall be minimized either by shutting equipment off when not in use or reducing
the maximum idling time to 5 minutes (as required by the California airborne toxics control
measure Title 13, Section 2485 of California Code of Regulations {CCR}). Clear signage
shall be provided for construction workers at all access points.
FEBRUARY 2011 11
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
e) Create objectionable odors affecting a substantial number
X
of people?
DISCUSSION
The project entails development of trails and bike lanes with associated site improvements including an
approximately 70 foot long free -span pedestrian bridge, and an approximately 445 foot long (maximum
eight foot high) retaining wall, located within existing Town pedestrian and equestrian trail easements.
Project construction and grading activities would generate short-term emissions of criteria pollutants,
including suspended and inhalable particulate matter (airborne dust) and equipment exhaust emissions
and could be considered a potentially significant impact to neighboring residences and construction
workers on a temporary and localized basis. Standard dust control measures, as stipulated by the Air
Quality Management District (BAAQMD), will be used which will ensure that any air quality impacts
remain insignificant. Therefore the impact of grading activities on air quality or sensitive receptors for the
proposed improvements would be considered potentially significant impact and the following mitigation
measures will be required.
MITIGATION:
AIR -1 Bay Area Air Quality Management District (BAAQMD) dust control measures will be
incorporated into Final Improvements Plans/Grading Plans and will be adhered to during
construction for all improvements including the following.
a. All exposed surfaces (e.g., parking areas, staging areas, soil piles, graded areas, and unpaved
access roads) shall be watered two times per day.
b. All haul trucks transporting soil, sand or other loose material off-site shall be covered.
c. All visible mud or dirt track -out onto adjacent public roads shall be removed using wet power
vacuum street sweepers at least once per day. The use of dry power sweeping is prohibited.
d. All vehicle speeds on unpaved roads shall be limited to 15 mph.
e. All roadways, driveways, and sidewalks to be paved shall be completed as soon as possible.
f. Idling times shall be minimized either by shutting equipment off when not in use or reducing
the maximum idling time to 5 minutes (as required by the California airborne toxics control
measure Title 13, Section 2485 of California Code of Regulations {CCR}). Clear signage
shall be provided for construction workers at all access points.
FEBRUARY 2011 11
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The project area is located within the Town of Los Altos Hills and borders Page Mill Road and
Arastradero Road. The trail alignment is bordered by existing roadways, open lots, residential properties
and Matadero Creek along its western section. The trail alignment parallels Arastradero Road and
Highway 280 on the east, and Page Mill Road and Matadero Creek on the west. The Town is located in
the foothills on the eastern flank of the Santa Cruz Mountains, and consists of flat to moderately steep
topography. Annual rainfall for the Town of Los Altos Hills averages 13.5 inches per year. The most
prominent water feature in the vicinity of the project is Matadero Creek. Matadero Creek is a perennial
creek that emanates from the foothills to the west and flows through the Town of Los Altos Hills and the
City of Palo Alto before entering San Francisco Bay. Other water bodies in the area include Felt Lake
FEBRUARY 2011 12
Potentially
Issues (and Supporting Information Sources)
Potentially
Significant
Impact Unless
Less Than
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
4. Biological Resources - Would the project:
a) Have a substantial adverse effect, either directly or through
X
habitat modifications, on any species identified as a
candidate, sensitive, or special status species in local or
regional plans, policies, or regulations, or by the California
Department of Fish and Game or U.S. Fish and Wildlife
Service?
b) Have a substantial adverse effect on any riparian habitat or
X
other sensitive natural community identified in local or
regional plans, policies, regulations or by the California
Department of Fish and Game or U.S. Fish and Wildlife
Service?
c) Have a substantial adverse effect on federally protected
X
wetlands as defined by Section 404 of the Clean Water Act
(including, but not limited to, marsh, vernal pool, coastal,
etc.) through direct removal, filling, hydrological
interruption, or other means?
d) Interfere substantially with the movement of any. native
X
resident or migratory fish or wildlife species or with
established native resident or migratory wildlife corridors,
or impede the use of native wildlife nursery sites?
e) Conflict with any local policies or ordinances protecting
X
biological resources, such as a tree preservation policy or
ordinance?
f) Conflict with the provisions of an adopted Habitat
X
Conservation Plan, Natural Community Conservation Plan,
or other approved local, regional, or state habitat
conservation plan?
DISCUSSION
The project area is located within the Town of Los Altos Hills and borders Page Mill Road and
Arastradero Road. The trail alignment is bordered by existing roadways, open lots, residential properties
and Matadero Creek along its western section. The trail alignment parallels Arastradero Road and
Highway 280 on the east, and Page Mill Road and Matadero Creek on the west. The Town is located in
the foothills on the eastern flank of the Santa Cruz Mountains, and consists of flat to moderately steep
topography. Annual rainfall for the Town of Los Altos Hills averages 13.5 inches per year. The most
prominent water feature in the vicinity of the project is Matadero Creek. Matadero Creek is a perennial
creek that emanates from the foothills to the west and flows through the Town of Los Altos Hills and the
City of Palo Alto before entering San Francisco Bay. Other water bodies in the area include Felt Lake
FEBRUARY 2011 12
INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
which is located approximately 0.9 miles northwest of the trail alignment and Deer Creek, a perennial
creek that crosses under the trail alignment on the east side of the I-280 Freeway. There are no other
ponds, streams or other wetland habitats located within the project area. A 350 -foot section of the trail
follows an existing trail along Matadero Creek.
The trail alignment was surveyed for biological resources on November 29 and December 7, 2010 by
Coast Ridge Ecology (Attachment 1 Biological Resources Assessment). All plant and animal species
encountered on site were documented as well as plant communities and habitat types that could support
special status species.
PLANT COMMUNITIES AND HABITATS
Vegetation
Vegetation within the trail alignment project area includes Grassland (California Annual Grassland
Series); Central Coast Riparian Scrub (Salix lucida ssp. lasiandra Alliance), and suburban forest that is
associated with residential properties that border the trail alignment (Sawyer 2009). The project area also
includes several *planted roadside trees, most of which will not be impacted by the project.
Grassland habitat within the project area is primarily annual grassland. Annual grassland is dominated by
nonnative Mediterranean annual grasses and an assemblage of non-native forbs. Scattered oak species are
also present. This vegetation type is the most dominant plant community along the trail alignment. Most
of the trailside areas have been heavily disturbed as result of past road building, and vegetation consists of
nonnative plant species that colonize disturbed habitats. Species observed include annual grasses such as
wild oat (Avena barbata), Italian wildrye (Lolium multiflorum), and herbaceous we such as black
mustard (Brassica nigra), cut -leaf geranium (Geranium dissectum) and bristly ox -tongue (Picris
echioides).
Central Coast Riparian Scrub consisting of shining willow (Salix lucida ssp. lasiandra); arroyo willow
(Salix lasiolepis) and black walnut (Juglans californica var. hindsii) is present within Matadero Creek
along the trail alignment. This habitat type is dominated by native tree species and a predominately
nonnative shrub understory that includes Himalaya blackberry (Rubus discolor) and poison hemlock
(Conium maculatum). Central Coast Riparian Scrub (Salix lucida ssp. lasiandra Alliance) is considered a
rare plant community (CDFG 2006).
Suburban forest includes ornamental vegetation as well as remnant native trees such as valley oak
(Quercus lobata).
Roadside trees that will require removal as part of the project include: 3 Eucalyptus trees on the west side
of Arastradero Road, east of Page Mill Road to accommodate the eastbound bike lanes; 7 Coast live oak
trees on Arastradero Road at Stirrup Way at the east end of the new retaining wall, 1 Peruvian pepper tree
(Schinus molle) west of the wall for slope improvements, and 2 Coast live oak trees near Baleri Ranch
Road. Additionally, the project may require the removal of one red willow tree (Salix laevigata) and one
black walnut tree (Juglans californica var. hindsii) located along the trail alignment adjacent to Matadero
Creek. Two of the 3 eucalyptus trees proposed for removal, identified as tree #21 and #22, appear to
straddle the Town and County boundary line and may be subject to County tree removal requirements.
FEBRUARY 2011 13
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
There are no wetland habitats within the project alignment. A pedestrian bridge crossing will span the
width of Matadero Creek. This bridge, as proposed, will span the creek and will not impact any wetlands
or jurisdictional waters within the Creek. One other wetland feature borders the eastern portion of the
alignment. This is a narrow drainage swale on the west side of Arastradero Drive. The drainage is
approximately 700 feet long and extends along Arastradero Drive between Stirrup Way on the north and
Twin Oaks Court on the south. The dominant plant species within the swale is field mustard (Brassica
rapa), an upland species. No wetland vegetation was observed within the swale, and approximately 50%
of the length of the swale is contained in a concrete v -ditch.
To meet the US Army Corps of Engineers (ACOE) definition of wetland, an area must demonstrate three
critical characteristics: wetland vegetation, wetland hydrology, and wetland soils (Federal Interagency
Committee for Wetland Delineation, 1989). Additionally, to fall under jurisdiction of the ACOE, a
wetland must have some evident hydrological connection to other wetlands and/or waters of the United
States. The US Fish. and Wildlife Service definition of wetland is similar: at least periodically, the land
must support predominantly hydrophytes; the substrate must be predominantly undrained hydric soil; or
the substrate is non -soil that is saturated with water or covered by shallow water at some time during the
growing season of the year (Cowardin, et al., 1979). No hydrophytic vegetation or wetland hydrologic
indicators were observed within the project area.
Wildlife Habitat
The habitat types along the trail alignment provide potential foraging and breeding habitat for a variety of
native wildlife species.
Bird species that utilize grassland habitat include chestnut -backed chickadee, oak titmouse, Cooper's
hawk, sharp -shinned hawk (Accipiter striatus), white-tailed kite (Elanus leucurus) and great blue heron
(Ardea herodias), among others. Oak savannah/ grassland provides good foraging habitat and cover for
herbivorous mammals such as California meadow vole (Microtus californicus), pocket Botha's pocket
gopher, black -tailed hare (Lepus californicus) and black -tailed mule deer (Odocoileus hemionus).
Predators that utilize oak savannah/ grassland include gopher snake (Pituophis catenifer), red-tailed hawk
(Buteo jamaicensis) and bats such as pallid bat (Antrozous pallidus).
The riparian woodland habitat associated with Matadero Creek provides excellent habitat for passerine
birds such as song sparrow (Melospiza melodia), Wilson's warbler (Wilsonia pusilla), spotted towhee
(Pipilo maculatus), and bats such as California myotis (Myotis californicus) and Yuma bat (Myotis
yumanensis). Stream habitat combined with understory vegetation and woody debris within the riparian
forest supports amphibians such as Pacific tree frog (Hyla regilla), California red -legged frog (Rana
aurora draytonii) and California newt (Taricha torosa). Predators that likely utilize the riparian habitat
include raccoon (Procyon lotor), gray fox (Urocyon cinereoargenteus), red -shouldered hawk (Buteo
lineatus), and aquatic garter snakes (Thamnophis sp. ), among others.
Matadero Creek in the vicinity of the project area supports native and nonnative fishes. Species of native
fish expected to be present in the reach of creek near the project site include Sacramento sucker
(Catostomus occidentalis) and California roach (Hesperoleucus symmetricus). Non-native fish species
within the watershed that may be present in the creek include bluegill (Lepomus macrochirus), green
sunfish (Lepomis cyanellus) and goldfish (Carassius auratus), (SCVURPPP 2008).
Suburban forest provides habitat for a variety of wildlife, especially birds such as mourning dove
(Zenaida nzacroura), house wren (Troglodytes aedon), and house finch (Carpodacus mexicanus) among
FEBRUARY 2011 14
INITIAL STUDY — Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
others. Remnant native trees, especially larger and older trees, such as large valley oaks (Quercus lobata)
and coast live oaks, increase the habitat value of suburban areas through providing food resources for
wildlife in the form of acorns and insects, as well as providing important structure for nesting and
roosting.
Wildlife observed by sight or sign during the site visits included red-tailed hawk (Buteo jamaicensis),
Cooper's hawk (Accipiter cooperii), hairy woodpecker (Picoides pubescens), Nuttall's woodpecker
(Picoides nuttallii), bushtit (Psaltriparus minimus), scrub jay (Apheloconza californica), Bewick's wren
(Thryomanes bewickii), brown creeper (Certhia americana), oak titmouse (Baeolophus inornatus),
American kestrel (Falco sparverius), chestnut backed chickadee (Poecile rufescens), golden -crowned
sparrow (Zonotrichia atricapilla), Audubon's warbler (Dendroica coronata), black -tailed mule deer,
Botha's pocket gopher (Thomomys bottae), San Francisco dusky -footed woodrat (Neotoma fuscipes
annectens). Larger carnivore species that may also utilize habitats within the project area on an infrequent
basis include bobcat (Felis rufus), coyote (Canis latrans), and on rare occasion Mountain lion (Fells
concolor).
Owl pellets (possibly from a Great horned owl; Bubo virginianus), were observed beneath trees #21 and
#22 along the trail alignment, adjacent to Arastradero Road on November 29, 2010. Both trees are
eucalyptus trees and are proposed for removal. Tree #21 has a possible raptor nest located at
approximately 70 feet in height. Several San Francisco dusky -footed woodrat nests are located near the
trail alignment. All of these nest structures are outside of the project area however one nest is located
within a Coast live oak tree located along Arastradero Road near Stirrup Way that is proposed for
removal.
Wildlife Movement Corridors
Habitat loss, fragmentation, and degradation resulting from land use changes or habitat conversion can
alter the use and viability of wildlife movement corridors (i.e. linear habitats that naturally connect and
provide passage between two or more otherwise disjunct larger habitats or habitat fragments). In general,
studies suggest that habitat corridors provide connectivity for, and are used by wildlife and as such, are an
important conservation tool. According to Beier and Loe (1992), wildlife habitat corridors fulfill several
functions. They maintain connectivity for daily movement, travel, mate -seeking, and migration; plant
propagation; genetic interchange; population movement in response to environmental change or natural
disaster; and recolonization of habitats subject to local extirpation. The suitability of a habitat as a
wildlife movement corridor is related to, among other factors, the habitat corridor's dimensions (length
and width), topography, vegetation, exposure to human influence, and the species in question.
Species utilize movement corridors in several ways. "Passage species" are those species that use
corridors as thru-ways between outlying habitats. The habitat requirements for passage species are
generally less than those for corridor dwellers. Passage species use corridors for brief durations, such as
for seasonal migrations or movement within a home range. As such, movement corridors do not
necessarily have to meet any of the habitat requirements necessary for a passage species' everyday
survival. Large herbivores, such as deer and elk, and medium -to -large carnivores, such as coyotes,
bobcats and mountain lions, are typically passage species. "Corridor dwellers" are those species that have
limited dispersal capabilities — a category that includes most plants, insects, reptiles, amphibians, small
mammals, and birds — and use corridors for a greater length of time. As such, wildlife movement
corridors must fulfill key habitat components specific to a species' life history requirements in order for
FEBRUARY 2011 15
INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
them to survive. In general, however, the suitability and/or utility of the landscape — specifically, of the
landscape as corridor habitat — is best evaluated on a species -level.
Movement corridors for resident and migratory wildlife are not expected to be disrupted by the proposed
trail alignment. The trail will not present any obstacles to existing wildlife movement, and follows an
existing footpath along existing roadways for most it's length.
REGULATORY CONSIDERATIONS
Federal and state -listed species (endangered, threatened, fully -protected) receive various levels of legal
protection under the federal and state endangered species acts and the California Fish and Game Code:
The federal Migratory Bird Treaty Act of 1918 and Section 3500 of the California Fish and Game Code
protect active nests of migratory and other birds, and provide criminal penalties for take of hawks, owls,
and take or disturbance of all bird nests or eggs. Potential impacts to other special status or otherwise
sensitive species must be disclosed and evaluated pursuant to the California Environmental Quality Act
(CEQA).
Wetland permitting requirements that may provide additional protections for species and habitats include
the California Department of Fish and Game (DFG) 1600 Streambed Alteration Agreement permit
process, US Army Corps of Engineers (ACOE) Section 404 permit and the State Regional Water Quality
Control Board (RWQCB) 401 Certification permit.
Federal and State Endangered Species Acts
The United States Endangered Species Act (ESA) is administered by the United States Fish and Wildlife
Service (USFWS). The California Endangered Species Act (CESA), the Native Plant Protection Act
(LAPPA), and CEQA afford protection to species of concern included on State -maintained lists. The
California Department of Fish and Game (CDFG) has statutory responsibility for the protection of State
listed species, and is a trustee agency under CEQA.
Both the Federal and State endangered species acts provide protection for listed species. In particular, the
Federal act prohibits "take". "Take" is defined by the ESA as "to harass, harm, pursue, hunt, shoot,
wound, kill, trap, capture, or collect a federally listed, endangered species of wildlife, or to attempt to
engage in any such conduct." Take not specifically allowed by Federal permit under Section 10(a)(1)(B)
of the ESA is subject to enforcement through civil or criminal proceedings under Section 9 of the ESA.
While "take" is easily understood in the sense of deliberately capturing or killing individual animals,
Federal regulations also define take to include the incidental destruction of animals in the course of an
otherwise lawful activity, such as habitat loss due to development. Under those rules the definition of
take includes significant habitat modification or degradation that actually kills or injures wildlife by
significantly impairing essential behavioral patterns, including breeding, feeding, or shelter (50 CFR
Section 17.3).
Section 10(a) of the ESA permits the incidental take of an endangered or threatened species. Similarly,
Section 2081 of the CDFG Code or use of the CESA allows the Department to enter into management
agreements that make lawful activities which may otherwise result in habitat loss or take of individuals of
a state listed species.
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Species of Special Concern
The California Department of Fish and Game has designated certain animal species as "Species of Special
Concern" due to concerns about declining population levels, limited ranges, and continuing threats that
have made these species vulnerable to extinction. The goal of this designation is to bring attention to
these species in the hope that their population decline will be halted through mitigation or project redesign
to avoid impact. Species of special concern are protected only through environmental review of projects
under CEQA. The California Department of Fish and Game is a trustee agency and is solicited for its
comments during the CEQA process.
Federal species of concern are any species that may become vulnerable to extinction on a National level
from declining population trends, limited range, and/or continuing threats'.
Nesting Birds
Nesting birds, including raptors, are protected by the California Department of Fish and Game Code
3503, which reads, "It is unlawful to take, possess, or needlessly destroy the nest or eggs of any bird,
except as otherwise provided by this code or any regulation made pursuant thereto." Passerines and non -
passerine landbirds are further protected under the Federal Migratory Bird Treaty. Act. As such, the
CDFG typically recommends pre -construction surveys for potentially suitable nesting habitat that will be
directly (actual removal of trees/vegetation) or indirectly (noise disturbance) impacted by construction -
related activities.
California Environmental Quality Act
Some species that are otherwise not protected by the ESA or CESA and do not have a special CDFG or
Fish and Game Code designation (e.g., fully protected) may still, under CEQA, be determined to be
significantly impacted by a project. For example, if a project were to destroy or disturb a roosting site for
either a bat maternity colony or a wintering monarch butterfly colony it could significantly impact the
local and/or regional population of either species. Although loss of an individual bat or monarch butterfly
would likely be considered an insignificant impact, loss of a roost site where multiple individuals are
present may be considered significant. This is because roost sites may be limited in availability and often
have very specific habitat and/or microclimate conditions. When a roost site is lost, individuals may not
be able to find an alternate roost in sufficient time for protection from the elements before expiring.
However unless a roost site has already been studied and the local population of the subject species is
well known, the significance of the loss cannot be readily evaluated. In order to avoid a potential finding
of significant impact to species such as . roosting bats or monarchs, all potential habitats should be
seasonally avoided or field surveys should be completed to determine presence/absence.
California Native Plant Society and CEQA
The California Native Plant Society (CNPS) has developed a rating system for the state's rare, threatened
and endangered plants. Plants rated by CNPS are subject to protection under CEQA, and may also be
protected by state and federal endangered species laws if they are listed by the state or federal
government.
' This is no longer an official U.S. Fish and Wildlife Service category, but is still considered in this document
because it contains many species that could become threatened or endangered
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Regulated Waters
Impacts to stream channels (bed and bank) are regulated by the California Department of Fish and Game
Code §§ 1600 et seq., and may require a DFG Streambed Alteration Agreement. Impacts to wetlands and
streams may also fall under the jurisdiction of the Clean Water Act §404 permit process and the Porter -
Cologne Water Quality Control Act. The U.S. Army Corp of Engineers (USACE) enforces permit
provisions of the Clean Water Act regulating dredge and fill operations. The USACE also exerts
jurisdiction over "waters of the U.S." which include territorial seas, tidal waters, and non tidal waters in
addition to wetlands and drainages that support wetland vegetation, exhibit ponding or scouring, show
obvious signs of channeling, or have discernible banks and high water marks.
The State of California Regional Water Quality Control Board (RWQCB) enforces permit provisions of
the Porter -Cologne Water Quality Control Act. Projects that may potentially impact wetlands in the state
of California require a 401 Certification permit. Each 401 Certification is decided on a case-by-case .basis,
and is guided by the applicable requirements of the CWA, Porter -Cologne and the regulations.
Stormwater Control Requirements
In urbanized areas, stormwater runoff is the largest source of pollution to waters in creeks, ponds and
lakes. Pollution caused by stormwater runoff can be controlled through obtaining and complying with a
municipal stormwater permit from the National Pollutant Discharge Elimination System (NPDES).
Controls set forth in the permit offer an opportunity for development and redevelopment projects to
reduce impacts to water quality.
Town of Los Altos Hills Heritage Oak Tree Designation
Title 12, Chapter 2 of The Town of Los Altos Hills Municipal Code defines a Heritage Oak Tree as "any
tree of the genus Quercus, including, but not limited to, Valley Oak (Quercus lobata), California Live
Oak (Quercus agrifolia), Black Oak (Quercus kelloggii) and Blue Oak (Quercus douglasii) that has a
trunk or multiple trunk thirty-six (36) inches in circumference (approximately twelve (12) inches in
diameter) at a point four (4) feet above the root crowd'. No heritage oak trees are proposed for removal
as part of this project.
Santa Clara Valley Water District Streamside Standards and Guidelines
In their publication User Manual: Guidelines and Standards for Land Use Near Streams, the Santa Clara
Valley Water Resources Protection Collaborative (SCVWRPC 2006)2 emphasizes the vital role of
riparian vegetation in "maintaining stream stability, providing valuable wildlife habitat, and moderating
downstream flooding" , as well as regulating water quality by filtering pollutants from stormwater, such
as oil and grease from roadways, fertilizer runoff from lawns, and excess sediments from upstream.
Specifically, the stream -side environment supports riparian vegetation and the functions riparian
vegetation provides. Riparian vegetation benefits terrestrial species, as well as semi -aquatic amphibians
and reptiles and fish: Such habitat functions include:
Sediment stabilization: provided by riparian trees, shrubs, and grasses;
2 Chapters 2 and 3 of the Guidelines contain the adopted requirements of the Town of Los Altos Hills for
construction near a stream. Chapter 4 contains detailed specifications for use by architects, engineers and other
project designers. Chapters 5-11 do not contain adopted requirements; these chapters are provided as reference
material and background information for homeowners and developers.
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INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL 1WROVEMENT PROJECT
• Shading and water temperature moderation: provided by mature riparian shrubs and trees;
• Overhanging escape cover: provided by shrubs and grasses near the stream edge;
• Coarse particulate organic matter: organic material dropping into the stream in the form of leaves,
insects, etc., that provide input for aquatic food webs;
• Bird breeding and foraging habitat: provided by mature native riparian species, such as
cottonwoods and willows, oaks, other trees, shrubs, forbs, grasses, and the stream banks;
• Foraging, refugia, aestivation, and breeding habitat for semi -aquatic amphibian and reptile
species: provided by low vegetation, rocks, downed materials, and the stream banks;
• Foraging, breeding, hibernacula, and dispersal habitat for mammals: provided by the riparian
vegetation and the stream bank substrate.
Significance Criteria
The significance criteria are based in part on the Environmental Checklist (CEQA Guidelines Appendix G
[Title 14 CCR, Section 15000-15387]). These criteria are used to determine the extent to which the
proposed project would impact sensitive biological resources. The threshold of significance may vary for
each species or habitat, and is determined by the lead agency. Using these guidelines, the Project would
result in a significant impact if it would:
• Have a substantial adverse effect, either directly or through habitat modifications, on any species
identified as a candidate, sensitive, or special -status species in local or regional plans, policies, or
regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service.
• Have a substantial adverse effect on any riparian habitat or other sensitive natural community
identified in local or regional plans, policies, regulations or by the California Department of Fish
and Game or US Fish and Wildlife Service.
• Have a substantial adverse effect on federally protected wetlands as defined by Section 404 of the
Clean Water Act (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct
removal, filling, hydrological interruption, or other means.
• Interfere substantially with the movement of any native resident or migratory fish or wildlife
species or with established native resident or migratory wildlife corridors, or impede the use of
native wildlife nursery sites.
• Conflict with any local policies or ordinances protecting biological resources, such as a tree
preservation policy or ordinance.
• Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community
Conservation Plan, or other approved local, regional, or state habitat conservation plan.
SPECIAL STATUS PLANTS, ANIMALS, AND NATURAL COMMUNITIES
The California Department of Fish and Game (CDFG) Natural Diversity Data Base (CNDDB) maintains
records of reported occurrences of sensitive plant, animal and natural plant communities of concern.
CNDDB records provide useful information about what species have been found in a given project area,
and what species may be expected in similar habitat types. An area that has not been surveyed or visited
may support sensitive species that have not been discovered and reported; and may require site-specific
surveys to rule out special status species occurrences. The U. S. Fish- and Wildlife Service (USFWS),
Sacramento, also maintains lists of listed species and other species of concern that may occur in or be
affected by projects in a given USGS topographic quadrangle.
CNDDB records for the Palo Alto 7.5 minute topographic quadrangle and eight surrounding quadrangles
were reviewed for sensitive element occurrences on the project site (CDFG 2010a). Review of the US
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INITIAL STUDY — Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
Fish and Wildlife Service list of endangered and threatened species for the nine 7.5 minute quadrangles,
and the CNPS on-line Inventory of Rare and Endangered Plants (CNPS 20 10) was also conducted.
Special status species that were identified in the region as having at least some minimal potential for
occurrence based on proximity to the site, or similar habitat utilization were included in Appendix B of
the Biological Assessment (Attachment 1). Special -status species that have a higher probability for
occurrence onsite, based on habitat types and/or recorded observations within 5 miles of the property are
discussed in greater detail below. Special status species found exclusively within habitats not present on
the property (i.e. sand dune, serpentine grassland, salt marsh, freshwater marsh and/or marine habitats,
etc.) were excluded from analysis due to the lack of these habitats on or adjacent to the property.
• There is. potential for one federally listed species, the California red -legged frog, (Rana aurora
draytonir) and one state fully protected species, white-tailed kite (Elanus leucurus) to utilize the
project area.
• One non -listed special status species was found to occur within the trail alignment, the San
Francisco dusky -footed woodrat (Neotoma fuscipes annectens). Four additional non -listed special
status wildlife species were identified as having potential for presence within the project area,
Cooper's hawk (Accipiter cooperii), loggerhead shrike (Lanius ludovicianus), western red bat
(Lasiurus blossevilliz) and pallid bat (Antrozous pallidus),.
• Eight species on various watch lists that also have potential for presence within the project area
include fringed myotis (Myons thysanodes), long-legged myotis (Myotis volans), hoary bat
(Lasiurus cinereus), Yuma bat (Myotis yumanensis), long-eared bat (Myotis evotis), California
thrasher (Toxostoma redivivum), Nuttall's woodpecker (Picoides nuttallii) and oak titmouse
(Baeolophus inornatus).
• Two special status plant species: western leatherwood (Dirca occidentalis) and San Francisco
collinsia (Collinsia multicolor) were identified as having potential to occur within the project
area.
• One rare.plant community, Central Coast Riparian Scrub (Salix lucida ssp. lasiandra Alliance)
was identified within Matadero Creek, adjacent to the trail alignment.
Three additional federally and/or state listed species that are a high priority for conservation are included
in the following discussion. These are San Francisco garter snake (Thamnophis sirtalis tetrataenia),
California tiger salamander (Ambystoma californiense) and steelhead (Oncorhynchus mykiss irideus).
Though these species are not expected to occur on site they are federally listed species and have been
detected in the region (CDFG 2010a).
California Red -legged Frog
The California red -legged frog (CRF) is a federally listed Threatened species and a California Species of
Special Concern.
Red -legged frogs are known to occur in slow -flowing streams, and marshes with heavily vegetated shores
for breeding as well as grasslands, riparian woodland, oak woodland and coniferous forests. These frogs
stay near the shore hidden in vegetation rather than in open water. Seasonal bodies of water are frequently
occupied by red -legged frogs, and in some areas these may be critical for persistence. It is speculated that
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INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
California red -legged frogs may lie dormant during dry periods of the year or during drought. California
red -legged frogs are thought to disperse widely during autumn, winter, and spring rains. Juveniles use the
wet periods to expand outward from their pond of origin and adults may move between aquatic areas.
Frogs disperse through many types of upland vegetation and use a broader range of habitats outside of
breeding season. CRF have been observed to move extensively and travel up to 2 miles or more between
breeding ponds without apparent regard to topography, vegetation type, or riparian corridors (Bulger in
litt.1998, in USFWS, 2002).
The breeding season for CRF generally begins in January and lasts through March. Minimum breeding
age appears to be two years in males and three years in females (Jennings and Hayes 1985). Females lay
750-4000 eggs in clusters attached to aquatic vegetation, two to six inches below the water surface. Eggs
hatch in two to three weeks. Once hatched, the tadpoles generally take between 11 and 20 weeks to
metamorphose, doing so between May and August. Although most tadpoles are expected to transform in
the summer, they can also over -winter, so transformation can take from about 4 to13 months. CRF
typically require a permanent water source with a minimum depth of 0.7 meters (2.5 feet) (USFWS
2004). Successful breeding has been observed in sub -optimal habitats with little or no emergent
vegetation present (USFWS 2004). In the absence of vegetation CRF will attach their eggs to rocks, wood
or other debris.
CRF has been extirpated from 70 percent of its former range and now is found primarily in coastal
drainages of central California, from Marin County, California, south to northern Baja California,
Mexico. Potential threats to the species include elimination or degradation of habitat from land
development and land use activities and habitat invasion by non-native aquatic species (USFWS 2002).
The project area is outside of CRF Critical Habitat (USFWS 2005). The nearest recorded observation of
CRF (Occ. #230 ; 2001) is located at Matadero Creek, approximately 1.0 miles northeast of the project
site (CDFG 2010a). Both adults and tadpoles were observed at this site between 1997 and 2001. There are
several more observations of CRF that have been recorded within 5 miles of the project area including
sightings in Bear Creek and San Francisquito Creek (CDFG 2010a). There are also several additional
creeks and ponds within the Los Altos Hills, Woodside and Portola Valley area that provide potential
habitat for CRF.
There is potential habitat for CRF to occur within the section of Matadero Creek that is adjacent to the
project area. Because CRF can utilize upland habitats and travel up to 2 miles when dispersing from
breeding areas, there is potential that CRF to occur within the trail alignment when dispersing in the rainy
season. Avoidance and minimization measures should be followed to insure CRF are not impacted by the
proposed trail project.
California Tiger Salamander
California tiger salamander (Ambystoma californiense; hereafter referred to as CTS) is a large, terrestrial
salamander with a black body and white to yellow spots and bars (Stebbins 2003). The Central California
Distinct Population Segment (DPS) is federally -listed as Threatened (USFWS 201Ob) and is designated as
a California Species of Special Concern (CDFG 2010b). California tiger salamanders are distributed
throughout the Central Valley and Central Coast ranges from Colusa County south to San Luis Obispo
and Kern counties from sea level to 1054 meters (3,460 feet) in elevation. Two disjunct populations are
located within Sonoma County and Santa Barbara County, which are geographically isolated from the
Central Valley population.
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INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
Critical habitat for the Central California DPS of CTS was designated in 2005 (USFWS 2005) and there
are ten critical habitat units within Santa Clara County. The project area does not overlap with any
critical habitat unit for CTS.
The nearest CNDDB record of CTS (Occ. #63; 2005) is from Lake Lagunita, approximately 2.3 miles
northeast of the project site (CDFG 2010a). CTS have also been documented using restored ponds on the
west side of Junipero Serra Boulevard near Lake Lagunita, approximately 2.1 miles northeast of the
project site. CTS have not'been detected at Felt Lake (pers. comm. Dr. Alan Launer). No breeding or
suitable summer aestivation habitat is present on site or in the immediate project vicinity and CTS is not
expected to occur within or adjacent to the project area.
San Francisco Garter Snake
The San Francisco garter snake (SFGS) is federally and state listed as endangered and is a fully protected
species under §5050 of the California Fish and Game Code. A highly aquatic subspecieg'of the common
garter snake endemic to the San Francisco Bay Area, San Francisco garter snakes are distributed along the
western San Francisco Peninsula from the southern San Francisco County border south to Waddell
Lagoon south of Ano Nuevo and as far west. as Crystal Springs Reservoir. It occurs sympatrically with its
primary prey species, the California red -legged frog (Rana aurora draytonii); however, it will
opportunistically prey on a variety of species including frogs, tadpoles, egg masses, newts, small fish,
salamanders, reptiles, small mammals, birds and their eggs and several small invertebrates (Stebbins
2003).
The nearest recorded observation of SFGS is located near the Stanford Linear Accelerator, approximately
4.0 miles west of the project area (CNDDB 2010a). The only other occurrence within the region is located
approximately 5.1 miles northwest of the project site on a private property on Portola Road.
The closest aquatic habitat that could potentially support SFGS within the vicinity of the project area is
Matadero Creek. This habitat, though it has been documented to support the California red -legged frog
which is an important prey species of the San Francisco garter snake, is unlikely to support San Francisco
garter snakes due to a lack of suitable marsh and/or pond habitat associated with the creek. No other
potentially suitable habitat for this species exists within the vicinity. This species is not expected to occur
within the project area.
Steelhead
Steelhead (Oncorhynchus mykiss irideus) within the Central California Coast ESU was federally -listed as
threatened on August 18, 1997. The Central California Coast ESU Ecologically Significant Unit (ESU)
includes all naturally spawned populations of Steelhead (and their progeny) in California streams from the
Russian River to Aptos Creek, and the drainages of San Francisco and San Pablo Bays eastward to the
Napa River (inclusive), excluding the Sacramento -San Joaquin River Basin (NOAA 2005a). Major river
basins containing spawning and rearing habitat for this ESU comprise approximately 6,516 square miles
in California. The following counties lie partially or wholly within these basins (or contain migration
habitat for the species): Alameda, Contra Costa, Marin, Mendocino, Napa, San Francisco, San Mateo,
Santa Clara, Santa Cruz, Solano, and Sonoma.
Steelheads are anadromous fish that migrate from the ocean into fresh water streams to spawn (Moyle
2002). Rainbow trout refers to the resident form of the species that inhabits lakes or streams and does not
migrate to the ocean. Steelhead build redds (i.e., spawning beds) at the head of riffles where water is well
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oxygenated and nearby pools with deeper water provide safe refuge for juveniles. Optimal temperatures
for growth are 15-18°C. While in freshwater streams, steelhead feed on drifting aquatic organisms,
terrestrial insects and bottom dwelling invertebrates (Moyle 2002 The Santa Clara Hydrologic Unit
includes South Bay creeks from San Francisquito Creek in Palo Alto eastward to Coyote Creek (NOAA
2005b). Matadero Creek occurs within this region, but is excluded from this critical habitat designation
for Central California Coast steelhead ESU.
Matadero Creek watershed probably supported a small steelhead run in the past and steelhead continue to
enter the system from San Francisco Bay, according to local residents (SCBWMI 2001). Channelization,
flood control projects, and barriers such as culverts have drastically reduced fish habitat (SCBWMI
2001). Currently this watershed is not expected to supporta steelhead population (Leidy, et al, 2005).
Deer Creek, a small tributary to Matadero Creek on the east side of the trail alignment, is unlikely to
support steelhead currently, or historically, due to the steepness and low flows of this small watershed
(Leidy, et al, 2005).
San Francisco Dusky -footed Woodrat
The San Francisco dusky -footed woodrat is a California species of special concern and is one of eleven
recognized subspecies. The San Francisco dusky -footed occurs in the Santa Cruz Mountains and in the
East Bay hills. The dusky -footed woodrat is generally a nocturnal mammal that occurs in a variety of
brushy and wooded areas. They inhabit oak and riparian woodlands, coastal scrub, and chaparral habitats
with a well-developed understory. The woodrat builds stick structures (`houses') for nesting up to 2
meters long and a meter in height that may last for tens of years. These stick houses are constructed on the
ground, within shrubs and trees, tree hollows, rock crevices and sometimes in human structures such as
wood sheds. The elaborate stick houses help protect the woodrat from seasonal temperature extremes and
predators. Woodrats exhibit high site fidelity and are highly arboreal. They are generalist herbivores and
live in loosely -cooperative societies. The dusky -footed woodrat eats primarily woody plants, including
leaves, flowers, nuts and berries. Coast live oak trees are an important food resource for this species.
Several San Francisco dusky -footed woodrat nests are located near the trail alignment. All of these nest
structures are outside of the project area however one nest is located within a Coast live oak tree located
along Arastradero Road near Stirrup Way that is proposed for removal.
Raptors and Nesting Birds
No special status birds were observed on the property, however the property provides potential habitat for
several special status birds. Three special status raptors, white tailed kite, Cooper's hawk, and sharp -
shinned hawk have potential to utilize the property.
White-tailed Kite
This species potentially nests within grasslands and oak savannah habitats in the foothills of Woodside
and Portola Valley. White-tailed kites forage over grassland and nest in shrubs and trees. The species is a
year-round resident of Central and Coastal California. This species was not observed during biological
surveys of the property however potential suitable foraging and nesting habitat is present along the trail
alignment.
Cooper's Hawk
This species inhabits dense stands of oak woodlands, riparian deciduous forests, or other forest habitats
often near water and suburban areas (Baicich & Harrison 2005). This woodland raptor hunts in broken
woodlands, along forest edges and suburban areas for medium-sized birds and mammals. Typical nest site
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INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
selection is characterized by mature trees with significant canopy cover; although, species will nest in
suburban areas in a variety of trees (Curtis et al. 2006). One Cooper's hawk was observed flying near the
eastern boundary of the property on November 29, 2010. There is potentially suitable foraging and
nesting habitat for this species along the trail alignment.
Loggerhead Shrike
The loggerhead shrike is designated a California Species of Special Concern by -the California
Department of Fish and Game (CDFG 2010b). Loggerhead shrikes inhabit a variety of habitats from open
grasslands and scrub to woodlands and riparian areas (Yosef 1996, Baicich & Harrison 2005). This
species is a year-round resident throughout much of California; however, population declines have been
observed in the San Francisco Bay Area in areas where oak savannah habitat has been lost (Shuford and
Gardali 2008). Trees, shrubs, and fence posts are important habitat features, which serve as hunting
perches and an announcement site for territory pair maintenance (Shuford and Gardali 2008). Breeding
begins in February and is double- to triple -brooded (Baicich & Harrison 2005). There is potentially
suitable nesting and foraging habitat within the project area.
Other Migratory Birds
The native plant communities and ornamental vegetation on the property provide potential nesting habitat
for a variety of native songbirds, raptors and other species. Species observed that may forage and nest
within the project area include red-tailed hawk, American kestrel, oak titmouse, Nuttall's woodpecker,
Bewick's wren, bushtit, scrub jay, Oregon junco, chestnut -backed chickadee, Anna's hummingbird,
Stellar's jay, scrub jay, and spotted towhee, among others.
Bats
Potential bat roosting and foraging habitat is located on the property due to the habitats present within the
project area and on adjacent properties (annual grassland, riparian, suburban forest). Two special status
bat species were determined to have potential to occur within the project area, pallid bat and western red
bat.
Pallid Bat
The pallid bat is a California Species of Special Concern and a U.S. Forest Service and Bureau of Land
Management Sensitive Species, and a High Priority species by the Western Bat Working Group (CDFG
2010b).
The pallid bat is found in a variety of habitats including all types of woodland especially oak savanna,
grassland, riparian areas and wetlands, orchards, vineyards, and irrigated cropland if appropriate roosting
sites are available. A very social bat, the pallid bat occupies a wide variety of habitats throughout
California, including grasslands, shrublands, woodlands, and forests. The species is most common in
open, dry areas with rocky areas necessary for roosting. Roosts in rock crevices, caves, mine shafts,
under bridges, in buildings and tree hollows. It feeds on a variety of insects and arachnids. There is
moderate potential for pallid bats to use the property for roosting and foraging.
Western Red Bat
The western red bat is designated as a California Species of Special Concern by the California
Department of Fish and Game and a High Priority species by the Western Bat Working Group (CDFG
2010b).
FEBRUARY 2011 24
INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
The western red bat is easily distinguished by its distinctive reddish coloration. Roosting typically occurs
individually in dense clumps of tree foliage in riparian areas, especially willows, cottonwoods and
sycamores, and within orchards and suburban areas in trees and shrubs. Roosts are often hidden from
view and only access from below (Bolster 2005). Red bats are primarily moth specialists, but individuals
will forage for a variety of other insects. Individuals have been observed foraging around street lamps and
flood lights in suburban areas (Bolster 2005). The western red bat migrates long distances, but has been
reported to overwinter in the Bay Area with interspersed winter foraging bouts on warm days (Bolster
2005).
The property provides habitat. for additional species that are on watch lists including fringed myotis, long-
legged myotis, long-eared myotis, Yuma myotis and hoary bat. Additional bats within the region may
utilize the property such as Mexican free. -tailed bat (Tadarida brasiliensis), big brown bat (Eptesicus
fuscus) and others. Though these species do not have protected status under ESA or CESA, impacting a
roosting bat colony could be considered a significant impact under CEQA, due to the limited amount of
suitable roosting habitat and the slow reproductive rate of bats.
Monarch Butterfly
Monarch butterfly is not a state or federally listed species, however due to its unique life history and
habitat requirements it is given special consideration under the California Environmental Quality Act
(CEQA) review process. Winter roost sites extend along the western coast from Mendocino in northern
California, south to Baja California, Mexico. Roost habitat consists of wind -protected tree groves,
typically eucalyptus (Eucalyptus globulus), Monterey pine (Pinus radiata) and Monterey Cypress
(Cupressus macrocarpa), with nectar and water sources nearby. Roost sites consist of congregations of
several hundred to several thousand adult butterflies. Along the Central California coast, monarch
butterflies typically roost between October and February.
The closest record of a monarch roost site is located at-Ardenwood Farms Regional Preserve in Newark,
approximately 13.3 miles northeast of the site (CDFG 2010a). The row of Eucalyptus trees along
Arastradero Road provides potential habitat for monarchs, however monarch roost sites typically consist
of groves of trees that are protected from the wind, with nectar and water sources nearby. These habitat
components are not present within the project area. No Monarch butterflies were observed during
biological surveys in November and December 2010, and trees proposed for removal along the trail
alignment are unlikely to support monarch butterflies.
Special Status Plants and Rare Plant Communities -
No impacts are anticipated to special status species or natural communities as a result of the proposed trail
project. No special status plant species were observed on the property, however the property was
surveyed in the fall, when many plants, especially annuals, are past their bloom stage, and are less visible.
Two special status plants were determined to have potential for presence on site based on habitat types.
These are western leatherwood (Dirca occidentalis) and San Francisco collinsia (Collinsia multicolor).
One rare plant community, Central Coast Riparian Scrub (Salix lucida ssp. lasiandra Alliance), was
identified within the project area (Holland 1986; CDFG 2006; CDFG 2007).
California Red -legged Frog
Potential impacts to California red -legged frogs can be avoided and/or minimized by implementing
minimization and avoidance measures (USFWS 1999b). The following mitigation measures shall be
followed:
FEBRUARY 2011 25
INITIAL STUDY — Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
MITIGATION:
BIO -1 All ground disturbance associated with trail building activities on site will be conducted during
the dry season (April 15 — October 15).
BIO -2 Staging areas and access routes to the work area will be delineated and inspected by the project
biologist prior to establishment to avoid unnecessary impacts to California red -legged frogs and
their habitat.
BIO -3 Exclusion fencing will be erected around portions of the construction site adjacent to Matadero
Creek and Deer Creek prior to the onset of project activities. Fencing will be a minimum of 3 feet
in height and buried in the soil 4 to 6 inches to inhibit California red -legged frogs from entering
the project area.
BIO -4 Once the exclusion fence is installed, a pre -construction survey will be conducted to ensure that
no California red -legged frogs are present in the project area.
BIO -5 If California red -legged frogs are detected on site, the USFWS would be contacted for guidance
on moving the animal(s) to a safe location. No CRF would be handled without permission from
the USFWS.
BIO -6 During project activities, all trash that may attract predators will be properly contained, removed
from the work site and disposed of regularly. Following construction, all trash and construction
debris will be removed from work areas.
BIO -7 All practicable erosion control Best Management Practices (BMPs) will be implemented to
minimize the potential of impacts to water quality of Matadero Creek and Deer Creek.
BIO -8 No smoking except in vehicles will be permitted within vegetated areas.
BIO -9 Trash dumping will be prohibited.
San Francisco Dusky Footed Woodrat
MITIGATION:
BIO -10 Woodrat nests within 100 feet of ground disturbing activities'shall be surveyed and monitored to
determine if nests are active.
BIO -11 For woodrat nests that can be avoided, orange construction/ protective fencing will be placed
between work areas and woodrat nests, and will include a 2 -foot buffer between the protective
fencing and the nest.
BIO -12 For woodrat nests that cannot be avoided, woodrat nests shall be dismantled by a qualified
biologist. Dismantling will be conducted during the time of year that would least impact breeding
woodrats (i.e. late fall/ winter: November/December/January). Dismantling will be conducted
slowly to avoid impacting neonate woodrats. If woodrat neonates are detected in the nest,
dismantling will cease and the nests will be checked every 48 hours to determine if the neonates
are still present. Dismantling will continue once it is determined that the neonates are no longer
FEBRUARY 2011 26
INITIAL STUDY— Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
present and have either been weaned from their mothers, or the mothers have moved them from
the nest.
BIO -13 DFG shall be consulted if any San Francisco dusky -footed woodrats (adults, subadults or
neonates) are harmed by project activities.
Special Status Raptors
The trees and shrubs on the property provide potential nesting habitat for birds including raptors such as
Cooper's hawk and white-tailed kite. Ground disturbance and construction activities on the property could
impact nesting birds, including raptors.
MITIGATION:
BIO -14 If ground disturbance activities are proposed during the bird nesting season (February 1— August
31), then preconstruction surveys for nesting birds including raptors such as white-tailed kite and
Cooper's hawk, shall be conducted by a qualified biologist within 300 feet of the construction
area, where access is available, within two weeks prior to construction.
BIO -15 If active bird nests are found, and project activities could potentially impact nesting success,
appropriate no -activity buffer zones shall be established around active nest (s). Typical iso-
activity buffer zones are 300 feet for active raptor nests. If project activities would be conducted
within these buffer zones, the US Fish and Wildlife Service Migratory Bird Treaty Office and the
Department of Fish and Game will be consulted for guidance and all necessary permits would be
obtained.
Migratory Birds
The native plant communities and ornamental vegetation on the property provide potential nesting habitat
for a variety of native songbirds, raptors and other species.
MITIGATION:
BIO -16 If ground disturbance activities are proposed during the bird nesting season (February 1 — August
31), then preconstruction surveys for migratory birds, shall be conducted by a qualified biologist.
For migratory raptors including red-tailed hawk, surveys shall be conducted within 300 feet of the
project area where access is available. For non -raptor migratory bird species, surveys shall be
conducted within 100 feet of the project area, where access is available. Surveys for migratory
birds shall be conducted within two weeks prior to any ground disturbance, tree removal and/or
tree pruning activities within the project area.
BIO -17 If active bird nests are found, and project activities could potentially impact nesting success,
appropriate no -activity buffer zones shall be established around active nest (s). Typical iso-
activity buffer zones are 300 feet for active raptor nests, and 100 feet for active migratory bird
nests. If project activities would be conducted within these buffer zones, the US Fish and Wildlife
Service Migratory Bird Treaty Office and the Department of Fish and Game will be consulted for
guidance and all necessary permits would be obtained.
Special Status and Non -Special Status Bats
The property provides potential habitat for roosting bats. There are several trees on the property that may
provide day and/or night roosts for special status and non -special status bat species.
FEBRUARY 2011 27
INITIAL STUDY -LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
MITIGATION:
BIO -18 To avoid impacts to roosting bats within the project area, including pallid bat and western red bat,
pre -construction surveys for roosting bats shall be conducted by a qualified bat biologist within
two weeks prior to any ground disturbance, tree removal and/or tree pruning activities within the
project area. Any tree removal on site shall be done according to the recommendations of the
qualified bat biologist. If active bat maternity roosts are detected (this season is typically between
April and August) within a structure or tree that will be impacted by the project, the roost would
need to be avoided until all young are volant, and the Department of Fish and Game will be
consulted for permission in the use of any bat exclusion devices.
Special Status Plants and Plant Communities
MITIGATION:
BIO -19 To avoid impacts to special status plant species, (San Francisco collinsia and western
leatherwood), one or more preconstruction surveys shall be conducted by a qualified biologist
prior to any ground disturbance and/or vegetation removal within the project area. The survey (s)
should be timed to occur at the most suitable time of year (i.e. bloom period) to detect San
Francisco collinsia and western leatherwood.
BIO -20 If San Francisco collinsia and/or western leatherwood are identified within the project area, and
one or more individual plants could potentially be impacted by project activities, the California
Native Plant Society and the Department of Fish and Game will be consulted to develop
appropriate mitigation measures. Mitigation measures may include seed/plant material collection,
propagation and replanting in an appropriate restoration area(s).
Regulated Waters and Wetlands
While the proposed project does not include any in -channel work or grade alteration or construction
below the top of bank, indirect effects on the aquatic environment of Matadero Creek and Deer Creek
could result from project implementation. In addition, direct and indirect impacts to California red -legged
frog habitat within Matadero Creek could be considered significant under CEQA guidelines.
Project implementation could affect the regulated waters and wetlands in the following ways:
Erosion from the project site during construction could release sediments into the creek channels,
adversely affecting the aquatic habitat and indirectly impacting aquatic species.
Inadvertent spills of cement, oil and grease, or other contaminants during construction could
reach the creek channels, adversely affecting the aquatic habitat and indirectly impacting aquatic
species.
In order to avoid indirect impacts regulated waters and wetlands, the measures outlined below shall be
implemented. With the incorporation of these measures, project implementation would not result in any
inadvertent impacts on downstream water quality.
MITIGATION:
BIO -21 Under no circumstances shall spoils, gravel, paving materials or other construction materials or
debris be placed, even temporarily, along or below the top of bank of the creek.
FEBRUARY 2011 28
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
BIO -22 Best Management Practices (BMPs) to prevent pollutants, construction materials or debris from
entering the creek and storm drains shall be installed prior to the initiation of work and properly
maintained. For further clarification refer to Hydrology and Water Quality Mitigation Measure
HYD -5.
Invasive Plant Species
The following measure is recommended to avoid impacts from introduced invasive plant species:
MITIGATION:
BIO -23 The project proponent shall avoid planting ornamental species reported by the California Invasive
Plant Council, to have the potential to be invasive. Species on this list shall be prohibited from
use in landscaping.
DISCUSSION
The project site is located on Arastradero and Page Mill Roads near the intersection of Page Mill Road
and the I-280 freeway. Matadero Creek flows through the project site and residential development
surrounds the project site. Proposed surface improvements will be located in both disturbed and
undisturbed areas. There is typically a higher potential for encountering archaeological resources in areas
adjacent to a creek. Although the extent of surface disturbance at the site would be minimal, the potential
for such resources cannot be completely eliminated due to the site's proximity to the Matadero Creek
corridor. Therefore, the impacts of construction are considered potentially significant and the following
mitigation measures will be required:
MITIGATION:
CUL -lIn the event that archaeological traces are encountered, all construction within a 50 -meter radius
of the find will be halted, the Planning Director will be notified, and an archaeologist will be
retained to examine the find and make appropriate recommendations.
CUL - 21f human remains are discovered, the Santa Clara County Coroner will be notified. The Coroner
will determine whether or not the remains are Native American. If the Coroner determines that
the remains are not subject to his authority, he will notify the Native American Heritage
Commission, who shall attempt to identify descendants of the deceased Native Americans.
FEBRUARY 2011 29
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Im act
5. Cultural Resources - Would the project:
a) Cause a substantial adverse change in the significance of a
X
historical resource as defined in 15064.5?
b) Cause a substantial adverse change in the significance of
X
an archaeological resource pursuant to 15064.5?
c) Directly or indirectly destroy a unique paleontological
X
resource or site or unique geologic feature?
d) Disturb any human remains, including those interred
X
outside of formal cemeteries?
DISCUSSION
The project site is located on Arastradero and Page Mill Roads near the intersection of Page Mill Road
and the I-280 freeway. Matadero Creek flows through the project site and residential development
surrounds the project site. Proposed surface improvements will be located in both disturbed and
undisturbed areas. There is typically a higher potential for encountering archaeological resources in areas
adjacent to a creek. Although the extent of surface disturbance at the site would be minimal, the potential
for such resources cannot be completely eliminated due to the site's proximity to the Matadero Creek
corridor. Therefore, the impacts of construction are considered potentially significant and the following
mitigation measures will be required:
MITIGATION:
CUL -lIn the event that archaeological traces are encountered, all construction within a 50 -meter radius
of the find will be halted, the Planning Director will be notified, and an archaeologist will be
retained to examine the find and make appropriate recommendations.
CUL - 21f human remains are discovered, the Santa Clara County Coroner will be notified. The Coroner
will determine whether or not the remains are Native American. If the Coroner determines that
the remains are not subject to his authority, he will notify the Native American Heritage
Commission, who shall attempt to identify descendants of the deceased Native Americans.
FEBRUARY 2011 29
INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
CUL - 3If the Planning Director finds that the archaeological find is not a significant resource, work will
resume only after the submittal of a preliminary archaeological report and after provisions for
reburial and ongoing monitoring are accepted. Provisions for identifying descendants of a
deceased Native American and for reburial will follow the protocol set forth in CEQA Guidelines
Section 15064.5(e). If the site is found to be a significant archaeological site, a mitigation
program will be prepared and submitted to the Planning Director for consideration and approval,
in conformance with the protocol set forth in Public Resources Code Section 21083.2.
CUL 4 A final report shall be prepared when a find is determined to be a significant archaeological site,
and/or when Native American remains are found on the site. The final report will include
background information on the completed work, a description and list of identified resources, the
disposition and curation of these resources, any testing, other recovered information, and
conclusions.
FEBRUARY 2011 30
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The site area is Monterey Formation bedrock. Matadero Creek cuts through the Monterey Fomation hills
flowing through flad alluvial terrace floor. With thin soil overlaying soft bedrock, liquefaction is not
considered a site hazard. The site is located .6 miles north of the Monte Vista fault and 3 miles northeast
of the San Andreas fault. The site is not located within an Alquist Priolo fault zone or Santa Clara County
fault hazard zone. The site is not located in a State -designated liquefaction hazard zone or a Santa Clara
County liquefaction hazard zone. No serpentine soils exist within the trail alignment or in adjacent areas
near the project area.
Grading quantities for retaining wall construction will require 1,200 cubic yards of cut. As required of all
grading permits issued by the Town, the project will be subject to policies and standards for grading and
erosion control, such as silt fencing, and reseeding graded areas to minimize the potential for soil erosion
on the site. All other engineering aspects of the project will be conditioned by the requirements of the
Town Engineering Division. The project will not expose people or structures to seismic ground shaking
FEBRUARY 2011 31
Potentially
Significant
Issues (and Supporting Information Sources)
Potentially
Significant
Impact Unless
Mitigation
Less Than
Significant
No
Impact
Incorporated
Impact
Impact
6. Geology and Soils - Would the project expose people or
structures to potential substantial adverse effects, including
the risk of loss, injury, or death involving:
a) Rupture of a known earthquake fault, as delineated on the
X
most recent Alquist-Priolo Earthquake Fault Zoning Map
issued by the State Geologist for the area or based on other
substantial evidence of a knowri fault? Refer to Division of
Mines and Geology Special Publication 42.
b) Strong seismic ground shaking?
X
c) Seismic -related ground failure, including liquefaction?
X
d) Landslides?
X
e) Result in substantial soil erosion or the loss of topsoil?
X
f) Be located on a geologic unit or soil that is unstable, or that
X
would become unstable as a result of the project, and
potentially result in on- or off-site landslide, lateral
spreading, subsidence, liquefaction or collapse?
g) Be located on expansive soil, as defined in Table 18-1-B of
X
the Uniform Building Code (1994), creating substantial
risks to life or property?
h) Have soils incapable of adequately supporting the use of
X
septic tanks or alternative wastewater disposal systems
where sewers are not available for the disposal of waste
water?
DISCUSSION
The site area is Monterey Formation bedrock. Matadero Creek cuts through the Monterey Fomation hills
flowing through flad alluvial terrace floor. With thin soil overlaying soft bedrock, liquefaction is not
considered a site hazard. The site is located .6 miles north of the Monte Vista fault and 3 miles northeast
of the San Andreas fault. The site is not located within an Alquist Priolo fault zone or Santa Clara County
fault hazard zone. The site is not located in a State -designated liquefaction hazard zone or a Santa Clara
County liquefaction hazard zone. No serpentine soils exist within the trail alignment or in adjacent areas
near the project area.
Grading quantities for retaining wall construction will require 1,200 cubic yards of cut. As required of all
grading permits issued by the Town, the project will be subject to policies and standards for grading and
erosion control, such as silt fencing, and reseeding graded areas to minimize the potential for soil erosion
on the site. All other engineering aspects of the project will be conditioned by the requirements of the
Town Engineering Division. The project will not expose people or structures to seismic ground shaking
FEBRUARY 2011 31
INITIAL STUDY —Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
or failure, and is not located on unstable soils. Therefore, it is anticipated that impacts dues to geology
and soils will be considered a less than significant impact.
MITIGATION: None required.
DISCUSSION
In 2006 California passed the California Global Warming Solutions Act (AB 32), which limits statewide
greenhouse gas (GHG) to 1990 levels and establishes a goal of achieving these emission reductions by
2020. AB 32 required the California Air Resources Board (CARB) to adopt a comprehensive blueprint for
limiting. GHG emissions by the end of 2008 and complete the necessary rulemaking to implement the
plan by the end of 2011.In addition the adoption of SB 97 in 2007 mandates that the California Office of
Planning and Research (OPR) prepare CEQA Guidelines to establish standards for evaluation of GHG
emissions including the creation of feasible mitigation measures. The California Resource Agencies
adopted amendments to the CEQA Guidelines for GHG emissions that require public agencies in
California to. evaluate GHG emissions within their CEQA documents using either qualitative or
quantitative methods. Although the modified CEQA Guidelines require that CEQA documents evaluate
GHG emissions to determine if they will be significant, the CEQA Guidelines do not establish a
methodology or quantitative thresholds for making this determination.
The Bay Area Air Quality Management District (BAAQMD) has adopted revisions to their CEQA
Guidelines for addressing Air Quality impacts. These guidelines include proposed quantitative thresholds
for GHG emissions.
The proposed project entails construction of new trails, bike lanes, a 55 foot long free -span pedestrian
bridge, and a 445 foot long (six foot maximum height) retaining wall. The project would not generate new
motor vehicle traffic and will generate GHG emissions substantially below the BAAQMD thresholds.
Temporary construction activities could generate greenhouse gas emissions and is considered a
potentially significant impact. Bay Area Air Quality Management District emissions control measures
will be adhered to during construction for all improvements and implementation of Air Quality mitigation
measures la. through If. will reduce temporary construction impacts to less than significant.
MITIGATION: Refer to Air Quality Mitigation Measure AIR -1a. through If.
FEBRUARY 2011 32
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Inco orated
Im act
Impact
7. Greenhouse Gases - Would the project:
a) Generate greenhouse gas emissions, either directly or
X
indirectly, that may have a significant impact on the
environment, based on any applicable threshold of
significance?
b) Conflict with any applicable plan, policy or regulation of
X
an agency adopted for the purpose of reducing the
emissions of greenhouse gases?
DISCUSSION
In 2006 California passed the California Global Warming Solutions Act (AB 32), which limits statewide
greenhouse gas (GHG) to 1990 levels and establishes a goal of achieving these emission reductions by
2020. AB 32 required the California Air Resources Board (CARB) to adopt a comprehensive blueprint for
limiting. GHG emissions by the end of 2008 and complete the necessary rulemaking to implement the
plan by the end of 2011.In addition the adoption of SB 97 in 2007 mandates that the California Office of
Planning and Research (OPR) prepare CEQA Guidelines to establish standards for evaluation of GHG
emissions including the creation of feasible mitigation measures. The California Resource Agencies
adopted amendments to the CEQA Guidelines for GHG emissions that require public agencies in
California to. evaluate GHG emissions within their CEQA documents using either qualitative or
quantitative methods. Although the modified CEQA Guidelines require that CEQA documents evaluate
GHG emissions to determine if they will be significant, the CEQA Guidelines do not establish a
methodology or quantitative thresholds for making this determination.
The Bay Area Air Quality Management District (BAAQMD) has adopted revisions to their CEQA
Guidelines for addressing Air Quality impacts. These guidelines include proposed quantitative thresholds
for GHG emissions.
The proposed project entails construction of new trails, bike lanes, a 55 foot long free -span pedestrian
bridge, and a 445 foot long (six foot maximum height) retaining wall. The project would not generate new
motor vehicle traffic and will generate GHG emissions substantially below the BAAQMD thresholds.
Temporary construction activities could generate greenhouse gas emissions and is considered a
potentially significant impact. Bay Area Air Quality Management District emissions control measures
will be adhered to during construction for all improvements and implementation of Air Quality mitigation
measures la. through If. will reduce temporary construction impacts to less than significant.
MITIGATION: Refer to Air Quality Mitigation Measure AIR -1a. through If.
FEBRUARY 2011 32
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The project site is not located in the vicinity of an air strip and will not include the routine transport or
release of hazardous materials, and will not interfere with an adopted emergency response plan. Since the
site is mostly undeveloped, the potential for encountering hazardous materials during project construction
would be low. Construction of the project will include roadway paving, retaining wall construction, and
installation of Stevens Creek Quarry Crusher Fines on trails and may involve the temporary use and
transport of potentially hazardous materials. Standard safety conditions and compliance with local and
State ordinances concerning the use and transport of toxic substances and use of hazardous materials
FEBRUARY 2011 33
Potentially
Significant
Issues (and Supporting Information Sources)
Potentially
Significant
Impact Unless
Mitigation
Less Than
Significant
No
Impact
Incorporated
Impact
Impact
8. hazards and Hazardous Materials - Would the project:
a) Create a significant hazard to the public or the environment
X
through the routine transport, use, or disposal of hazardous
materials?
b) Create a significant hazard to the public or the environment
X
through reasonably foreseeable upset and accident
conditions -involving the release of hazardous materials into
the environment?
c) Emit hazardous emissions or handle hazardous or acutely
X
hazardous materials, substances, or waste within one-
quarter mile of an existing or proposed school?
d) Be located on a site which is included on a list of
X
hazardous materials sites compiled pursuant to Government
Code Section 65962.5 and, as a result, would it create a
significant hazard to the public or the environment?
e) For a project located within an airport land use plan or,
X
where such a plan has not been adopted, within two miles
of a public airport or public use airport, would the project
result in a safety hazard for people residing or working in
the project area?
f) For a project within the vicinity of a private airstrip, would
X
the project result in a safety hazard for people residing or
working in the project area?
g) Impair implementation of or physically interfere with an
X
adopted emergency response plan or emergency evacuation
plan?
h) Expose people or structures to a significant risk of loss,
X
injury or death involving wildland fires, including where .
wildlands are adjacent to urbanized areas or where
residences are intermixed with wildlands?
DISCUSSION
The project site is not located in the vicinity of an air strip and will not include the routine transport or
release of hazardous materials, and will not interfere with an adopted emergency response plan. Since the
site is mostly undeveloped, the potential for encountering hazardous materials during project construction
would be low. Construction of the project will include roadway paving, retaining wall construction, and
installation of Stevens Creek Quarry Crusher Fines on trails and may involve the temporary use and
transport of potentially hazardous materials. Standard safety conditions and compliance with local and
State ordinances concerning the use and transport of toxic substances and use of hazardous materials
FEBRUARY 2011 33
INITIAL STUDY— LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
related to construction of the project will ensure that any potential public health risks would be less than
significant.
NIITIGATION: None required.
FEBRUARY 2011 34
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
9. Hydrology and Water Quality - Would the project:
a) Violate any water quality standards or waste discharge
X
requirements?
b) Substantially deplete groundwater supplies or interfere
X
substantially with groundwater recharge such that there
would be a net deficit in aquifer volume or a lowering of
the local groundwater table level (e.g., the production rate
of pre-existing nearby wells would drop to a level which
would not support existing land uses or planned uses for
which permits have been granted)?
c) Substantially alter the existing drainage pattern of the site
X
or area, including through the alteration of the course of a
stream or river, in a manner which would result in
substantial erosion or siltation on- or off-site?
d) Substantially alter the existing drainage pattern of the site
X
or area, including through the alteration of the course of a
stream or river, or substantially increase the rate or amount
of surface runoff in a manner, which, would result in
flooding on- or off-site?
e) Create or contribute runoff water which would exceed the
X
capacity of existing or planned stormwater drainage
systems or provide substantial additional sources of
polluted runoff?
f) Otherwise substantially degrade water quality?
X
g) Place housing within a 100 -year flood hazard area as
X
mapped on a federal Flood Hazard Boundary or Flood
Insurance Rate Map or other flood hazard delineation map?
h) Place within a 100 -year flood hazard area structures, which
X
would impede or redirect flood flows?
i) Expose people or structures to a significant risk of loss,
X
injury or death involving flooding, including flooding as a
result of the failure of a levee or dam?
j) Inundation by seiche, tsunami, or mudflow?
X
FEBRUARY 2011 34
INITIAL STUDY -LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION:
Construction activities and ground disturbance in proximity to Matadero Creek have the potential to
degrade water quality if soil materials exposed during construction, or hazardous materials were
accidentally released into the tributary. These impacts are prohibited by Section 9 of the Clean Water Act.
Protection measures are considered necessary to prevent excavated soil and construction or hazardous
materials from inadvertently entering Matadero Creek during construction.
An approximately 70 foot long pre -fabricated free -span pedestrian bridge is. proposed across Matedero
Creek in the vicinity of Baleri Ranch Road. Detailed drawings of the bridge have not yet been developed,
however, preliminary plans show that the bridge would avoid impacts to the conveyance area of the creek,
by anchoring the bridge to concrete piers on either side of the creek banks (no piers or anchors would be
located within the creek). The piers would be above the top of the banks, elevating the bottom of the
bridge above the banks. Therefore, it is anticipated that the proposed bridge will not impede or redirect
flows in the event of a 100 year flood. The process of installing the bridge would include either strip
footing or drilling and the placement of piers which could result in the release of sediment or construction
and hazardous materials into the creek. Adoption of mitigation measures HYD -1 and HYD -2 will reduce
hydrology impacts to a less than significant level.
The proposed trails project consists of a five foot wide trail, approximately one linear mile in length,
constructed of pervious Stevens Creek Quarry Crusher fines and new bike lands. It is expected that the
project will disturb more than one acre of land and will be subject to the Notice of Intent (NOI)
requirements of the San Francisco Bay Regional Water Quality Control Board (SFBRWQCB) under the
State Nation Pollutant Discharge Elimination System (NPDES). A Storm Water Pollution Prevention Plan
will be developed and implemented consistent with mitigation measure HYD -3 through HYD -6 will
reduce water quality impacts to a less than significant level.
The proposed bridge is consistent with the Water Collaborative Guidelines and Standards for Land Uses
Near Streams in that the proposed bridge will be located above the 100 -year flood elevation and no
vegetation is proposed for removal. Disturbed soils will be re -vegetated with watershed specific native
plant species from within the Matadero Creek riparian corridor.
Construction of a free span bridge in addition to implementation of erosion control measures, post
construction re -vegetation measures and measures requiring designation of storage areas for hazardous
materials and washing areas for equipment will decrease the potential impacts to hydrology and water
quality to less than significant with mitigation.
MITIGATION:
HYD A A hydraulic analysis shall be completed prior to final bridge design, to calculate peak discharges
for existing and post -project conditions on the site using the Santa Clara Valley Water District
procedures for flood discharge estimation to assess the conveyance area of Matadero Creek and
ensure that bridge construction will not encroach into the conveyance area of the creek and will
not impede or redirect flows in the event of a 100 -year flood.
HYD -2 Obtain permits for the proposed free span pedestrian bridge from the California Department of
Fish and Game and Santa Clara Valley Water District prior to issuance of a grading permit.
HYD — 3 Re -vegetate disturbed areas with watershed native riparian plant species immediately following
construction.
HYD — 4 Erosion and sedimentation control measures, such as silt fencing and use of straw wattles, shall
be implemented during and after construction.
FEBRUARY 2011 35
INITIAL STUDY - LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
HYD — 5 Prepare a Storm Water Pollution Prevention Plan (SWPPP) incorporating the following Best
Management Practices (BMPs) into grading and construction plans to prevent inadvertent
discharge of materials into Matadero Creek in compliance with the National Pollutant Discharge
Elimination System (NPDES) permit.
a. The contractor will identify and implement specific procedures for the handling
and containment of hazardous materials. This will include establishing dedicated
fueling and maintenance areas for construction vehicles and equipment
(including small equipment such as chainsaws), which will be located at least 65
feet from any drainage, riparian habitat or water body. Fueling must be
performed on level ground.
b. The contractor will identify and implement as appropriate specific procedures for
handling and containment of hazardous materials. These will include catch basins
for refueling and having absorbent pads on hand to respond to accidental spills.
c. Absorbent spill clean-up materials and spill kits shall be available in fueling areas
and on fueling trucks and shall be disposed of properly after use.
d. Drip pans or absorbent pads shall be used during vehicle and equipment fueling,
unless the fueling is performed over an impermeable surface in a dedicated
fueling area.
e. Fuel tanks shall not be "topped -off'
f. Vehicles and equipment shall be inspected on each day for evidence of leaks.
Leaks shall be repaired immediately or problem vehicles or equipment shall be
removed from the project site.
g. Absorbent spill clean-up materials shall be available in fueling and maintenance
areas and used on small spills instead of hosing down or burying techniques. The
spent absorbent material shall be removed promptly and disposed of properly.
HYD — 6 The construction plans shall clearly identify all proposed fueling, cleaning or maintenance areas
in accordance with the following:
h. No fueling, cleaning, or maintenance of vehicles or equipment shall take place
within the riparian corridor to avoid the release of deleterious substances into
surface waters.
i. During construction, there will be no use of pesticides for maintenance, or
dumping of waste or refuse.
j. Equipment cleaning and temporary concrete washout area shall comply with the
following:
i. Location of temporary concrete washout facilities will be identified at
least 24 hours prior to a scheduled pour.
ii. Temporary concrete washout facilities, cleaning stations, and staging
areas shall be located on level ground at least 200 feet from channel
banks. Each facility shall be located away from construction traffic or
access areas to prevent disturbance or tracking.
iii. Temporary concrete washout facilities shall be constructed and
FEBRUARY 2011 36
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
maintained to sufficiently maintain all liquid and concrete wastes
generated by washout operations.
iv. . Once concrete wastes are washed into the designated area and allowed to
harden, the concrete shall be broken up, removed and properly disposed
of.
DISCUSSION
The Los Altos Hills General Plan designates the areas within the project site as "Residential" with an
"Open Space Conservation" overlay. Surrounding land uses include residential development, property
owned by Santa Clara Valley Water District north of Baleri Ranch Road, Caltrans right of way and a Park
and Ride lot at the intersection of Arastradero Road and Page Mill Road, and the I-280 freeway. The Los
Altos Hills General Plan does not identify any habitat conservation plans or natural community
conservation plans that apply to the project site.
Based on the scope of the proposed project and surrounding uses, the proposed project will not physically
divide an established community or conflict with any special policies. Based on the scope of the proposed
project, site location and surrounding uses it is anticipated that the project would have no impact on land
use or conflict with any specific plan, habitat conservation or natural community conservation plan.
MITIGATION: None required.
FEBRUARY 2011 37
Potentially
Significant
Issues (and Supporting Information Sources)
Potentially
Significant
Impact Unless
Mitigation
Less Than
Significant
No
Impact
Incorporated
Impact
Impact
10. Land Use and Planning - Would the project:
a) Physically divide an established community?
X
b) Conflict with any applicable land use plan, policy, or
X
regulation of an agency with jurisdiction over the project
(including, but not limited to the general plan, specific
plan, local coastal program, or zoning ordinance) adopted
for the purpose of avoiding or mitigating an environmental
effect?
c) Conflict with any applicable habitat conservation plan or
X
natural community conservation plan?
DISCUSSION
The Los Altos Hills General Plan designates the areas within the project site as "Residential" with an
"Open Space Conservation" overlay. Surrounding land uses include residential development, property
owned by Santa Clara Valley Water District north of Baleri Ranch Road, Caltrans right of way and a Park
and Ride lot at the intersection of Arastradero Road and Page Mill Road, and the I-280 freeway. The Los
Altos Hills General Plan does not identify any habitat conservation plans or natural community
conservation plans that apply to the project site.
Based on the scope of the proposed project and surrounding uses, the proposed project will not physically
divide an established community or conflict with any special policies. Based on the scope of the proposed
project, site location and surrounding uses it is anticipated that the project would have no impact on land
use or conflict with any specific plan, habitat conservation or natural community conservation plan.
MITIGATION: None required.
FEBRUARY 2011 37
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The Los Altos Hills General Plan does not identify any regionally or locally -important mineral resources
on the project site or in its vicinity. The project will not result in significant grading or excavation. There
will be little to no disturbance of mineral resources. Therefore the project would have no impact on
mineral resources.
MITIGATION: None required.
Potentially
Significant
Issues (and Supporting Information Sources)
Potentially
Impact Unless
Less Than
No
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
12. Noise - Would the project result in:
Impact
Incorporated
Impact
Impact
11. Mineral Resources - Would the project:
X
a) Result in the loss of availability of a known mineral
X
resource that would be of value to the region and the
residents of the state?
X.
b) Result in the loss of availability of a locally -important
X
mineral resource recovery site delineated on a local general
X
plan, specific plan or other land use plan?
DISCUSSION
The Los Altos Hills General Plan does not identify any regionally or locally -important mineral resources
on the project site or in its vicinity. The project will not result in significant grading or excavation. There
will be little to no disturbance of mineral resources. Therefore the project would have no impact on
mineral resources.
MITIGATION: None required.
FEBRUARY 2011 38
Potentially
Significant
Issues (and Supporting Information Sources)
Potentially
Significant
Impact Unless
Mitigation
Less Than
Significant
No
Impact
Incorporated
Impact
Impact
12. Noise - Would the project result in:
a) Exposure of persons to or generation of noise levels in
X
excess of standards established in the local general plan or
noise ordinance, or applicable standards of other agencies?
b) Exposure of persons to or generation of excessive
X.
groundborne vibration or groundborne noise levels?
c) A substantial permanent increase in ambient noise levels in
X
the project vicinity above levels existing without the
project?
d) A substantial temporary or periodic increase in ambient
X
noise levels in the project vicinity above levels existing
without the project?
e) For a project located within an airport land use plan or,
X
where such 'a plan has not been adopted, within two miles
of a public airport or public use airport, would the project
expose people residing or working in the project area to
excessive noise levels?
FEBRUARY 2011 38
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The noise levels created during the grading and construction of the project could create a temporary
disturbance to neighboring properties. The project will conform to the Town's construction hours
(Municipal Code Chapter 6 - Section 5-6.02) regulations and Noise regulations (Municipal Code Chapter
2). Compliance with these regulations will ensure that the neighboring properties are not significantly
impacted.
With enforcement of time restrictions and noise level standards, contained in the Town Noise regulations,
construction noise levels will be made to comply with the Town Noise regulations. Therefore the project
will not result in the exposure of persons to noise levels in excess of applicable standards or increase
ambient noise levels and impacts from temporary construction noise will be less than significant.
MITIGATION: None required.
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
f) For a project within the vicinity of a private airstrip, would
X
the project expose people residing or working in the project
X
area to excessive noise levels?
DISCUSSION
The noise levels created during the grading and construction of the project could create a temporary
disturbance to neighboring properties. The project will conform to the Town's construction hours
(Municipal Code Chapter 6 - Section 5-6.02) regulations and Noise regulations (Municipal Code Chapter
2). Compliance with these regulations will ensure that the neighboring properties are not significantly
impacted.
With enforcement of time restrictions and noise level standards, contained in the Town Noise regulations,
construction noise levels will be made to comply with the Town Noise regulations. Therefore the project
will not result in the exposure of persons to noise levels in excess of applicable standards or increase
ambient noise levels and impacts from temporary construction noise will be less than significant.
MITIGATION: None required.
DISCUSSION
The proposed project would not result in development for human occupancy and will not increase growth
in the area. The proposed project will not displace existing housing, nor cause the construction of
replacement housing. The proposed project is consistent with the Los Altos Hills General Plan and zoning
designations. Therefore, the project will have no impact on population and housing.
MITIGATION: None required.
FEBRUARY 2011 39
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
13. Population and Housing - Would the project:
a) Induce substantial population growth in an area, either
X
directly (for example, by proposing new homes and
businesses) or indirectly (for example, through extension of
roads or other infrastructure)?
b) Displace substantial numbers of existing housing,
X
necessitating the construction of replacement housing
elsewhere?
c) Displace substantial numbers of people, necessitating the
X
construction of replacement housing elsewhere?
DISCUSSION
The proposed project would not result in development for human occupancy and will not increase growth
in the area. The proposed project will not displace existing housing, nor cause the construction of
replacement housing. The proposed project is consistent with the Los Altos Hills General Plan and zoning
designations. Therefore, the project will have no impact on population and housing.
MITIGATION: None required.
FEBRUARY 2011 39
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
DISCUSSION
The proposed project would result in the construction of a pedestrian bridge, new and resurfaced trails
and separate bike lanes. The project would not require the need for additional school facilities, parks, and
fire or police services. Therefore the project would have no impact on public services or facilities.
MITIGAITON: None required.
Potentially
Significant
Issues. (and Supporting Information Sources)
Potentially
Significant
Impact Unless
Mitigation
Less Than
Significant
No
Impact
Incorporated
Impact
Impact
14. Public Services -
a) Would the project result in substantial adverse physical
X
impacts associated with the provision of new or physically
altered governmental facilities, need for new or physically
altered governmental facilities, the construction of which
could cause significant environmental impacts, in order to
X
maintain acceptable service ratios, response times or other
performance objectives for any of the public services:
Fire protection?
X
Police protection?
X
Schools?
X
Parks?
X
Other public facilities?
X
DISCUSSION
The proposed project would result in the construction of a pedestrian bridge, new and resurfaced trails
and separate bike lanes. The project would not require the need for additional school facilities, parks, and
fire or police services. Therefore the project would have no impact on public services or facilities.
MITIGAITON: None required.
DISCUSSION
The project will not result in a substantial increase of park usage or require new or expanded services.
The project will improve the safety of the bike lanes and trails for pedestrian and equestrian users. The
FEBRUARY 2011 40
Potentially
Significant
Issues (and Supporting Information Sources)
Potentially
Significant
Impact Unless
Mitigation
Less Than
Significant
No
Impact
Incorporated
Impact
Impact
15. Recreation -
a) Would the project increase the use of existing
X
neighborhood and regional parks or other recreational
facilities such that substantial physical deterioration of the
facility would occur or be accelerated?
b) Does the project include recreational facilities or require
X
the construction or expansion of recreational facilities,
which might have an adverse physical effect on the
environment?
DISCUSSION
The project will not result in a substantial increase of park usage or require new or expanded services.
The project will improve the safety of the bike lanes and trails for pedestrian and equestrian users. The
FEBRUARY 2011 40
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
project would be consistent with the goals and policies of the Open Space and Conservation Element of
the Town's General Plan. Therefore potential impacts will be kept at a less than significant level.
MITIGATION: None required.
DISCUSSION
The proposed project includes trail improvements, bike lanes and bicycle and pedestrian safety
improvements along Arastradero and Page Mill Roads. The project will encourage greater use of non -
motorized travel along this corridor by addressing key safety concerns.
The proposed improvements include the following:
➢ Pedestrian crossings at the south and east portions of the intersection of Baleri Ranch and Page
Mill Roads.
➢ Installation of a pathway and pedestrian bridge north of Baleri Ranch Road.
FEBRUARY 2011 41
Potentially
Significant
Issues (and Supporting Information Sources)
Potentially
Significant
Impact UnlessFSignificancant
Mitigation
s Than
No
Impact
Incorporated
m act
Impact
16. Transportation/Traffic - Would the project:
a) Conflict with an applicable plan, ordinance or policy
X
establishing measures of effectiveness for the performance
of the circulation system, taking into account all modes of
transportation including mass transit and non -motorized
travel and relevant components of the circulation system,
including but not limited to intersections, streets, highways
and freeways, pedestrian and bicycle paths, and mass
transit?
b) Conflict with an applicable congestion management
X
program, including, but not limited to level of service
standards and travel demand measures, or other standards
established by the county congestion management agency
for designated roads or highways?
c) Result in a change in air traffic patterns, including either an
X
increase in traffic levels or a change in location that results
in substantial safety risks?
d) Substantially increase hazards due to a design feature (e.g.,
X
sharp curves or dangerous intersections) or incompatible
uses (e.g., farm equipment)?
e) Result in inadequate emergency access?
X
f) Conflict with adopted policies, plans, or programs
X
regarding public transit, bicycle, or pedestrian facilities, or
otherwise decrease the performance or safety of such
facilities?
DISCUSSION
The proposed project includes trail improvements, bike lanes and bicycle and pedestrian safety
improvements along Arastradero and Page Mill Roads. The project will encourage greater use of non -
motorized travel along this corridor by addressing key safety concerns.
The proposed improvements include the following:
➢ Pedestrian crossings at the south and east portions of the intersection of Baleri Ranch and Page
Mill Roads.
➢ Installation of a pathway and pedestrian bridge north of Baleri Ranch Road.
FEBRUARY 2011 41
INITIAL STUDY — LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
➢ Restriping of the stop signs and installation of crosswalks at Berry Hill Court and Stirrup Way.
➢ Restriping of the stop sign at Twin Oaks.
➢ Restriping of turn lanes at the intersection of Page Mill and Arastradero Roads.
➢ Restriping of bike lanes along Page Mill Road and the western portion of Arastradero Roads.
➢ Road widening to accommodate new bike lanes along the eastern portion of Arastradero Road.
Project construction would entail 1,200 cubic yards of excavated soil for construction of a proposed 445
foot long (eight foot maximum height) retaining wall. Export of material off-site could generate up to 120
truckloads (assuming 10 cubic yards per truck). Truck operations would occur between 8:00 am. 5:30
p.m. A total .of approximately ten to twenty truck trips per day would be generated for approximately six
to twelve work days assuming approximately one to two trucks could be filled per hour.
The Town will work with the contractor to devise a traffic control plan to ensure safe and efficient traffic
flow under periods when soil is hauled on or off the project site. This would include, but would not be
limited to, provisions for the contractor to place construction notification signs noting the dates and time
of construction and hauling activities, or providing additional traffic control. All trucks hauling soil, sand,
and other loose debris will need to be covered (refer to Air Quality mitigation measure lb.). This
requirement will reduce potential traffic safety hazards to a less -than -significant level.
MITIGATION: None required.
FEBRUARY 2011 42
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
17. Utilities and Service Systems — Would the project:
a) Exceed wastewater treatment requirements of the
X
applicable Regional Water Quality Control Board?
b) Require or result in the construction of new water or
X
wastewater treatment facilities or expansion of existing
facilities, the construction of which could cause significant
environmental effects?
c) Require or result in the construction of new storm water
X
drainage facilities or expansion of existing facilities, the
construction of which could cause significant
environmental effects?
d) Have sufficient water supplies available to serve the
X
project from existing entitlements and resources, or are
new or expanded entitlements needed?
e) Result in a determination by the wastewater treatment
X
provider, which serves or may serve the project that it has
adequate capacity to serve the projects projected demand in
addition to the providers existing commitments?
FEBRUARY 2011 42
V
INITIAL STUDY— LOS ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT.
DISCUSSION
The project will not require the construction of new utilities or necessitate new service demands.
Therefore the project will have no impact to utilities, sewer and water or storm water treatment systems.
MITIGATION: None required.
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
f) Be served by a landfill with sufficient permitted capacity to
X
accommodate the projects solid waste disposal needs?
X
g) Comply with federal, state, and local statutes and
X
regulations related to solid waste?
DISCUSSION
The project will not require the construction of new utilities or necessitate new service demands.
Therefore the project will have no impact to utilities, sewer and water or storm water treatment systems.
MITIGATION: None required.
Through review of the proposed project the Town of Los Altos Hills finds that there are no potentially
significant impacts with the implementation of mitigation measures as recommended. The mitigation
measures provided in this Initial Study demonstrate that the proposed project does not have the potential
to substantially degrade the quality of the environment, reduce the habitat or cause a fish or wildlife
population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce
or -restrict the number or the range of a rare or endangered plant or animal, or eliminate important
examples of the major periods of California history or prehistory.
The proposed project includes development of new and resurfaced trails, a 55 foot long free span
FEBRUARY 2011 43
Potentially
Significant
Potentially
Impact Unless
Less Than
Issues (and Supporting Information Sources)
Significant
Mitigation
Significant
No
Impact
Incorporated
Impact
Impact
18. Mandatory Findings of Significance -
a) Does the project have the potential to degrade the quality
X
of the environment, substantially reduce the habitat of a
fish or wildlife species, cause a fish or wildlife population
to drop below self-sustaining levels, threaten to eliminate
a plant or animal community, reduce the number or
restrict the range of a rare or endangered plant or animal
or eliminate important examples of the major periods of
California history or prehistory?
b) Does the project have impacts that are individually
X
limited, but cumulatively considerable? ("Cumulatively
considerable" means that the incremental effects of a
project are considerable when viewed in connection with
the effects of past projects, the effects of other current
projects, and the effects of probable future projects)?
c) Does the project have environmental effects which will
X
cause substantial adverse effects on human beings, either
directly or indirectly?
Through review of the proposed project the Town of Los Altos Hills finds that there are no potentially
significant impacts with the implementation of mitigation measures as recommended. The mitigation
measures provided in this Initial Study demonstrate that the proposed project does not have the potential
to substantially degrade the quality of the environment, reduce the habitat or cause a fish or wildlife
population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce
or -restrict the number or the range of a rare or endangered plant or animal, or eliminate important
examples of the major periods of California history or prehistory.
The proposed project includes development of new and resurfaced trails, a 55 foot long free span
FEBRUARY 2011 43
INITIAL STUDY — Los ALTOS HILLS/STANFORD TRAIL IMPROVEMENT PROJECT
pedestrian bridge, road widening to accommodate new bike lanes, a 445 foot long (eight foot maximum
height) retaining wall, and roadway stripping to improve bicycle, and pedestrian safety. Surrounding uses
include single family residences, Santa Clara Valley Water District land north of Baleri Ranch Road,
Caltrans right of way, a Park and Ride lot at the intersection of Arastradero Road and Page Mill Road,
and the I-280 freeway.
Overall the proposed project would not significantly degrade the quality of the environment, have
substantial adverse effects on human beings directly or indirectly, or have any cumulatively considerable
impacts.
FEBRUARY 2011 44
Attachment 2
BIOLOGICAL RESOURCES ASSESSMENT
FOR
TOWN OF LOS ALTOS HILLS — C-2 TRAM
ARASTRADERO ROAD PATHWAY'
EUPROVEMENTS
LOS ALTOS HILLS, CALIFORNIA `§
G'a4
^F
PREPARED FO'`W'
Town,,`M-,'Los Altos Hills `qF
26379� reihonX Road =3
Los Altos7Hills, CWS4022
PREPAREDLY:
`` Coast Ridge Ecology
10.7 Geneva Avenue
Saz'sFrancisco, CA 94112
415' 404-6757 — Fax: 415-404-6097
Email: Crecology@gmail.com
January 2011
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Patinvay Improvements — January 2011-- Page i
TABLE OF CONTENTS
I. SUMMARY ..........................................................................................................................1
H. PROPERTY LOCATION.................................................................................................. 4
III. PROJECT DESCRIPTION.............................................................................................. 4
IV. METHODS...........................................................................................
V. EXISTING SETTING..........................................................................
A. SOILS....................................................................................................
B. HYDROLOGY AND WATER RESOURCES .................................................
VI. PLANT COMMUNITIES AND HABITAT TYPES....... ::..
A. VEGETATION........................................................... �� .......
B. WILDLIFE HABITAT.....................................................4
C. WILDLIFE MOVEMENT CORRIDORS ....................
....
` 7 1
VII. REGULATORY CONSIDERATIONS...... ..
A. FEDERAL AND STATE ENDANGERED SPECIESACTS.
B. SPECIES OF SPECIAL CONCERN
C. NESTING BIRDS .......................................................
D. CALIFORNIA ENVIRONMENTAL QUALITY ACT.........
E. CALIFORNIA NATIVE PLANT SOCIETY AND CEQA ..
F. REGULATED WATERS ........................:....:
G. STORMWATER CONTROL REQUIREMENTS ...s
H. TOWN OF LOS ALTOS HILLS HERITAGE�TRE) 3DESIC
I. SANTA CLARA VALL F "WA `ER DISTRICT 'REAMS]
J. SIGNIFICANCE CRITERIA . .....
....
VIII. SPECIAL STAT -6 LANI'S, ANIMAL$,,:ANI
A. CALIFORNr RED -LEGGED FROG . :..
s�
B. CALIFORNIA TIGER SALAMANDER .................
C SAN3FRANCISCO GARTER SNAKE ............
D. `STEELHEAD ........ �J ...... . '.................
ti , Ay
E. SAN FR-A?<1CISCO DUSKY=,FOOTED WOODRAT
F. RAPTORS"WNDNESTING 'BIRDS ......................
G. BATS........`.. ' s ..............................
H: MONARCH BUTTEZFI,Y..............................................................................
�..
I. SPECIAL STATUS PLANTS AND RARE PLANT COMMUNITIES .......................
�. 12
;y.... _........................................ 13
............................................. 13
.'.......................................... 13
................................. 14
Y
...�. i-ar
........................................... 14
.............................................. 14
71 ........................................... 15
STANDARDS AND GUIDELINES ... 15
..................................................16
NATURAL COMMUNITIES ..17
............... 18
...............19
............... 20
............... 21
............... 22
............... 23
............... 24
............... 25
............... 25
IX. RECOMMENDED AVOIDANCE AND MINIMIZATION MEASURES ................ 27
A. CALIFORNIA RED -LEGGED FROG..................................................................................... 27
B. SAN FRANCISCO DUSKY -FOOTED WOODRAT................................................................... 28
C. PROTECTION OF SPECIAL STATUS RAPTORS..................................................................... 29
D. PROTECTION OF MIGRATORY BIRDS................................................................................. 29
E. PROTECTION OF SPECIAL STATUS AND NON -SPECIAL STATUS BATS ............................... 30
F. PROTECTION OF SPECIAL STATUS PLANTS AND PLANT COMMUNITIES ............................. 30
G. HERITAGE TREE PERMIT -- TOWN OF LOS ALTOS HILLS ................................................. 30
H. PROTECTION OF REGULATED WATERS AND WETLANDS .................................................. 31
1072 Geneva Avenue, San Francisco CA 94112 . Ph: 415-404-6757 • Cell: 650-269-3894 • Fax: 415-404-6097
E-mail: CRecology@gmail.corn • www.CRecology.com
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd Pathway Improvements -- January 2011— Page ii
I. EXCLUSION OF INVASIVE SPECIES...................................................................................... 32
J. WILDLIFE CORRIDORS...................................................................................................... 32
Y.I. REFERENCES................................................................................................................ 33
LIST OF FIGURES
Figure 1. Project Location.......................................:..........................................8
Figure 2. Aerial Image of Project Area..................................................................9
Appe
Appe
APPENDICES
ie
:131
'ct Site ......... B-1
.1
1072 Geneva Avenue, San Francisca CA 94112 . Ph: 415-404-6757 • Cell: 650-269-3894 • Fax: 415-404-6097
E-mail: CRecology@gmail.com • www.CRecology.com
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I. SUMMARY
A biological assessment was conducted for the C-2 Trail Project located in the Town of Los
Altos Hills, California (Figure 1 . The C-2 trail starts at the intersection of Arastradero and
Purissima Roads, follows Arastradero Road under I-280 westerly to Page Mill Road, then
south along Page Mill Road to the intersection with Baleri Ranch Road/Arastradero Road
Ti ure 2). The C-2 Trail Project includes a walking path and separate bike lanes. The trail
covers approximately one lineal mile and incorporates existing paths where possible.
The path crossing of Matadero Creek near Baleri Ranch Road wiJF e done by either utilizing
the existing crossing on Baleri Ranch Road or constructing a pxe fabricated pedestrian bridge
over the creek. Intersection improvements at Page Mill Road) Bal &Ranch-Arastradero will
be completed to accommodate pedestrians.
rFT
The Town of Los Altos Hills is located in the foothills on the eastern flank`ofthe Santa Cruz
Mountains, and consists of flat to moderately steepotopography Annual rainfall�for the Town
of Los Altos Hills averages 13.5 inches per year. Land usesitiin and surrounding the
project area include roadways, residential areas, and a ca p I ool parking area at the intersection
Y
of Page Mill Road and Arastradero Road: r
Trees that will require removal include 3 Eu6a1`
side of Arastradero east of Page Mill Road to. a
live oak (Quercus agrifolia) trees on Arastrad#
new retaining wall, 1 Peruvian pepper tree (S&A
improvements, and 2,166 ast live oak�'trees near I
may require the removal,of one re 4'Willow tree
(Juglans californica var hzndsu) located along
Creek.
s.(Eucalypt& globulus) trees on the west
unodate the eastbound bike lanes; 7 Coast
)ad at Stirrup Way at the east end of the
molle)west of the wall for slope
i Ranch Road. Additionally, the project
'bz laevigata) and one black walnut tree
.rail alignment adjacent to Matadero
The trail4alignment was surveyed for biological resources on November 29 and December 7,
2010 by v ildlife biologist Patrick Kobemus. All plant and animal species encountered on site
were documented as well as plant communities and habitat types that could support special
status species W= ;`
The California Departrient"of Fish and Game (CDFG) Natural Diversity Database
(CNDDB), US Fish an&Wildlife Service List of Endangered and Threatened Species, the
California Museum of Vertebrate Zoology and the California Native Plant on-line
Inventory of Rare and Endangered Plants were consulted for known occurrences of
sensitive plant, animal and native plant communities of concern in the region. The CNDDB
query and the US Fish and Wildlife Service search included the Palo Alto 7.5' USGS
topographic quadrangle, and eight surrounding quadrangles (CDFG 2010a).
Vegetation within the trail alignment project area includes Grassland (California Annual
Grassland Series); Central Coast Riparian Scrub (Salix lucida ssp. lasiandra Alliance), and
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suburban forest that is associated with residential properties that border the trail alignment
(Sawyer 2009; Holland 1986). The project area also includes several planted roadside trees,
most of which will not be impacted by the project.
The most prominent water feature in the vicinity of the project area is Matadero Creek. A
350 -foot section of the trail follows an existing trail along Matadero Creek (Appendix A,
Photo A-1). Matadero Creek is a perennial creek that emanates from the foothills to the west
and flows through the Town of Los Altos Hills and the City of Palo Alto before entering San
Francisco Bay. Other water bodies in the area include Felt Lake which is located
approximately 0.9 miles northwest of the trail alignment and Deer Creek, a perennial creek
that crosses under the trail alignment on the east side of the I 280�freeway. There are no other
ponds, streams or other wetland habitats located within the ro ect area.
P P tj.., .�....�
Three soil map units were identified within the project
weathered sandstone or calcareous shale. Along mostµ
have been highly disturbed from road -building and,�gra
serpentine soils exist within the trail alignment ornac
Based on the field assessment and review of database
California Natural Diversity.Database (CNDDB), the fi
identified as having potential for occurrence rovaithin the
status species within the region that were ruled out'fror
V
expected based on habitat requirements and%gr othe vfa
activities (NRC
Ltareas near the
are derived from
hent these soils
,'2
10). No
ure sources such as the
special status species were
rea Additional special
it occurrence or are not
kluded in Appendix B.
• There is potentiaL,$ one f derally listed;, species, the California red -legged frog,
(Rana auroraFxlraytonii)and; one state fully protected species, white-tailed kite
(Elanus leucurus)*to utilizepthe project area �
•
One �non isfed special status species -vias found to occur within the trail alignment, the
San�'Francisco'dusky foofed woodrat (Neotoma fuscipes annectens). Four additional
=n, listed specialls tus wiiahf species were identified as having potential for
presence within the`project area, Cooper s hawk (Accipiter cooperii), loggerhead
shrike:Lanius ludovicianus ), western red bat (Lasiurus blossevillii) and pallid bat
Eight species 64iM rious watch lists that also have potential for presence within the
project area include fringed myotis (Myotis thysanodes), long-legged myotis (Myotis
volans), hoary bat (Lasiurus cinereus), Yuma bat (Myotis yumanensis), long-eared bat
(Myotis evotis), California thrasher (Toxostoma redivivum), Nuttall's woodpecker
(Picoides nuttallii) and oak titmouse (Baeolophus inornatus).
• Two special status plant species: western leatherwood (Dirca occidentalis) and San
Francisco collinsia (Collinsia multicolor) were identified as having potential to occur
within the project area.
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• One rare plant community, Central Coast Riparian Scrub (Salix lucida ssp. lasiandra
Alliance) was identified within Matadero Creek, adjacent to the trail alignment.
Three additional federally and/or state listed species that are a high priority for conservation
are included in the following discussion. These are San Francisco garter snake (Thamnophis
sirtalis tetrataenia), California tiger salamander (Ambystoma cal forniense) and steelhead
(Oncorhynchus mykiss irideus). Though these species are not expected to occur on site, a
discussion of each is provided because they are federally listed species and have been
detected in the region (CDFG 2010a).
No impacts are anticipated to special status species or rare plant cqffiriu6hities as a result of the
proposed project. Potential impacts and recommended measuresao..mitigate impacts to
regulated waters, special status species and special status communities are provided in Section
IX. u
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BRA for Town of Los Altos Hills C-2 Trail/Arastradero Rd. Pathway Improvements --January 2011
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II. PROPERTY LOCATION
The.0-2 Trail project is located in the Town of Los Altos Hills, California (Fijpure 1 . The C-
2 trail starts at the intersection of Arastradero and Purissima Roads, follows Arastradero Road
under I-280 westerly to Page Mill Road, then south along Page Mill Road to the intersection
with Baleri Ranch Road/Arastradero Road i re 2 .
III. PROJECT DESCRIPTION
The C-2 Trail Project includes a walking path and separate bike laiie�, The trail covers
approximately one lineal mile and incorporates existin # aths;.where ��ossble.
PP Y rP g 13 P a
The path portion will be constructed consistent with the Town's Type 2B
requirements, including:
r=
5 -feet width with 2 -feet wide shoulders where
Surface, 6 -inches of Stevens (
2 -inch x 6 -inch wood headers
The bike lanes will be striped on existing aEobaltic concrete(` `AC") paved roadways. In some
areas the existing AC surface, wzilJ require edge�wdenmg fc "accommodate the bike lanes. The
bike lanes on Arastradero from Pxurissima to Page Mill Rodd, and on Page Mill to Berry Hill
Court will be constructed;.in a Cl9.9M configuratton (separate, striped lanes in both
directions). On Page Mill betweenBerry Hill and�aleri Ranch Road, the bike lanes will be
Class III (bikes merge with` vehicular traffic u both directions). Appropriate striping and
signage willl,b8d included throi6 ut the Pi6"je8t'
The Protect includes an approximatelyf00-foot-long, 6 -foot -high (maximum height), poured
in-place concrete retaining wall on the south side of Arastradero Road, west of Stirrup Way.
The retaining°°wall will have an;architectural finish. At this wall location, there will be two
walking paths;b E, Type 2Bfrroadside path at the base of the wall and a second path at the
top of the adjacent�s ope This second path will be 4 -feet wide and have a native soil wearing
surface.
The path crossing of Matadero Creek near Baleri Ranch Road will be done by either utilizing
the existing crossing on Baleri Ranch Road or constructing a pre -fabricated pedestrian bridge
over the creek. Intersection improvements at Page Mill Road/Baleri Ranch-Arastradero will
be completed to accommodate pedestrians.
Trees that will require removal include 3 Eucalyptus (Eucalyptus globulus) trees on the west
side of Arastradero east of Page Mill Road to accommodate the eastbound bike lanes; 7 Coast
live oak (Quercus agrifolia) trees on Arastradero Road at Stirrup Way at the east end of the
new retaining wall, 1 Peruvian pepper tree (Schinus molle) west of the wall for slope
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improvements, and 2 coast live oak trees near Baleri Ranch Road. Additionally, the project
may require the removal of one red willow tree (Salix laevigata) and one black walnut tree
(Juglans californica var. hindsii) located along the trail alignment adjacent to Matadero
Creek.
IV. METHODS
The trail alignment was surveyed for biological resources on Noven t er 29 and December 7,
2010 by wildlife biologist Patrick Kobernus. Weather was over -.,.8f nd calm with air
temperatures in the 60's (F) on both visits. All plant and ammspecies encountered on site
were documented as well as plant communities and habitat Types that ;eouId support special
r.r
status species.3°�-'A
The California Department of Fish and Game (CDl,G) Natural Diversity Database ,
(CNDDB), US Fish and Wildlife Service List of Endangered and Threatened Species, the
California Museum of Vertebrate Zoology and the California"Nab"ive Plant on-line
Inventory of Rare and Endangered Plants were consulteown occurrences of
sensitive plant, animal and native plant communities of concerfj in the region. The CNDDB
query and the US Fish and Wildlife Service search,included the Palo'Alto 7.5' USGS
topographic quadrangle, and eight surrounding quadan ,es 2010a .
V. EXISTING
The project area is
and Arastradero R
The
also include a carpool parki
M<
Road. The Towns. located
and consists of flat
Hills averages 13.5
A. Soils
hm the Town of Los'Altos Hills and borders Page Mill Road
iil3alignmeritibordered by existing roadways, open lots,
idero°.Creek along its western section. The trail alignment
I Hi9lway:280 on the east, and Page Mill Road and Matadero
nding Tand-uses are primarily roadways, residential areas, and
area at the intersection of Page Mill Road and Arastradero
;the foothills on the eastern flank of the Santa Cruz Mountains,
ply steep topography. Annual rainfall for the Town of Los Altos
year.
Three soil map units were identified within the project area, Diablo-Urbanland complex, 9 to
15 percent slopes, Cropley clay, 2 to 9 percent slopes, and Zeppelin-Mccoy complex, 15 to
30 percent slopes. These soil units are derived from weathered sandstone or calcareous shale.
Along most areas of the trail alignment these soils have been highly disturbed from road -
building and grading activities (MRCS 2010). No serpentine soils exist within the trail
alignment or in adjacent areas near the project area.
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B. Hydrology and Water Resources
The project site is a linear trail that borders existing roadways (Arastradero Road and Page
Mill Road). A 350 -foot section of the trail follows an existing trail along Matadero Creek
(Appendix A, Photo A-1). Matadero Creek is a perennial creek that emanates from the
foothills to the west and flows through the Town of Los Altos Hills and the City of Palo Alto
before entering San Francisco Bay. The section of the creek that borders the trail alignment is
natural and has mature riparian forest along its banks. Other water bodies in the area include
Felt Lake which is located approximately 0.9 miles northwest of the trail alignment and Deer
Creek, a perennial creek that crosses under the trail alignment on theeast side of the I-280
Freeway. There are no other ponds, streams or other wetland habitats located within the
.,
project area. _ �
Matadero Creek consists of approximately eight miles of=cha
Estuary via the Palo Alto flood basin. Its drainage a ` reaapf
Matadero Creek is similar to many tributary streamsXto San k
portions of the creek provide good habitat for native f sh and
R
lower portions of the Creek that flow through urban areas hal
channelization, pollution and invasive species. Deer Crd6l(-U
which in turn is tributary to Matadero Creek. Deer Creek raj
and comprises approximately 2.5 miles 130 1.
The San Francisco Bay Regional Water (
Plan (RWQCB 1995), several beneficial i
Warm and Cold Freshwater Habitat. Fish
Non -contact water rec
1O
A.
the San Francisco
auare miles.
rancisco Bay, i that upper
other aquatic species; while the
-eleen highly impacted by
a tributary to Purissima Creek,
ns an area of 1.6 square miles
a(,- Board has established in its Basin
tadero`Cxeek, including Wildlife Habitat,
Fish Migration and Contact (RECl) and
AT TYPES
Vegetation withffn the trail alignment project area includes Grassland (California Annual
Grassland Series), Central Coast Riparian Scrub (Salix lucida ssp. lasiandra Alliance), and
suburban forest that is associated with residential properties that border the trail alignment
(Sawyer 2009). The project area also includes several planted roadside trees, most of which
will not be impacted by the project.
Grassland habitat within the project area is primarily annual grassland. Annual grassland is
dominated by nonnative Mediterranean annual grasses and an assemblage of non-native forbs.
Scattered oak species are also present. This vegetation type is the most dominant plant
community along the trail alignment. Most of the trailside areas have been heavily disturbed
as result of past road building, and vegetation consists of nonnative plant species that colonize
disturbed habitats. Species observed include annual grasses such as wild oat (Avena barbata),
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Italian wildrye (Lolium multiflorum), and herbaceous weeds such as black mustard (Brassica
nigra), cut -leaf geranium (Geranium dissectum) and bristly ox -tongue (Picris echioides).
Central Coast Riparian Scrub consisting of shining willow (Salix lucida ssp. lasiandra),
arroyo willow (Salix lasiolepis), red willow (Salix laevigata) and black walnut (Juglans
californica var. hindsii) is present within Matadero Creek along the trail alignment. This
habitat type is dominated by native tree species and a predominately nonnative shrub
understory that includes Himalaya blackberry (Rubus discolor) and poison hemlock (Conium
maculatum). Central Coast Riparian Scrub (Salix'lucida ssp. lasiandra Alliance) is
considered a rare plant community (CDFG 2006). =�
Suburban forest includes ornamental vegetation as well as
oak (Quercus lobata).
trees such as valley
Roadside trees that will require removal as part of the project "i'nclude 3 Eucalyptus trees on
the west side of Arastradero Road, east of Page Mill Road to accommodate he.,eastbound
bike lanes; 7 Coast live oak trees on Arastradero:;Road at Stirrup Way at the eastz{er d of the
new retaining wall, 1 Peruvian pepper tree (Schinus molle) we'stof the wall for#slope
t:> A
improvements, and 2 Coast live oak trees near Baleri Rdfi0fload. Additionally, the project
may require the removal of one red willow tree (Salix laevrgaia) and one black walnut tree
(Juglans californica var. hindsii) locatedalong the trail aligrient adjacent to Matadero
Creek.
Y"
There are no wetland habitats within the project �ahgnnient Apedestrian bridge crossing will
span the width of Matadero Creek.., This bridge, eas propos, ed,'xwill span the creek and will not
impact any wetlands orjurisdictioual waters within the Creek. One other wetland feature
borders the eastern portion of the alignment This s;a,narrow drainage swale on the west side
of Arastradero Drive. The dramage�js approximately 700 feet long and extends along
Arastradero Drive between Stnrup Way obi the'h6rth and Twin Oaks Court on the south. The
dominant plani species ithin theF Swale is field mustard (Brassica rapa), an upland species.
No wetland vegetationwas observed;wrthin the swale, and approximately 50% of the length
of the sviTales contained m a concrete v" -ditch (Appendix A: Photo A-2).
To meet the U&A my Corps of Engineers (ACOE) definition of wetland, an area must
demonstrate three critical characteristics: wetland vegetation, wetland hydrology, and wetland
soils (Federal Interagency Committee for Wetland Delineation, 1989). Additionally, to fall
under jurisdiction oft a wetland must have some evident hydrological connection
to other wetlands and/or waters of the United States. The US Fish and Wildlife Service
definition of wetland is similar: at least periodically, the land must support predominantly
hydrophytes; the substrate must be predominantly undrained hydric soil; or the substrate is
non -soil that is saturated with water or covered by shallow water at some time during the
growing season of the year (Cowardin, et al., 1979). No hydrophytic vegetation or wetland
hydrologic indicators were observed within the project area.
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Figure 1, Los Altos Hills Trail (C2) Project Location, Los Altos Hills, California.
Base Map: Topo Explorer. Map by Coast Ridge Ecology. December 2010.
122` 30' 122" 2T« 30" 122° 15' f22 ' 30' 122° W WGS84
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B. Wildlife Habitat
The habitat types along the trail alignment provide potential foraging and breeding habitat
for a variety of native wildlife species.
Bird species that utilize grassland habitat include chestnut -backed chickadee, oak titmouse,
Cooper's hawk, sharp -shinned hawk (Accipiter striatus), white-tailed kite (Elanus
leucurus) and great blue heron (Ardea herodias), among others. Oak savannah/ grassland
provides good foraging habitat and cover for herbivorous mammals=such as California
meadow vole (Microtus californicus), pocket Botha's pocket goper;°black-tailed hare
(Lepus californicus) and black -tailed mule deer (Odocoileus hrzionus). Predators that
utilize oak savannah/ grassland include gopher snake (Pi tuophis`catenifer), red-tailed hawk
(Buteo jamaicensis) and bats such as pallid bat (Antrozou.. palhdus)� s.
The riparian woodland habitat associated with Mal
for passerine birds such as song sparrow (MelosI`
pusilla), spotted towhee (Pipilo maculatus), and b'
californicus) and Yuma bat (Myotis yumanensis).
understory vegetation and woody debris within the
such as Pacific tree frog (Hyla regilla), ;California
and California newt (Taricha torosa). Predat�o#s t2
include raccoon (Procyon lotor), gray fog
hawk (Buteo lineatus), and aquatic garter
habitat
Wilson's
Sfie abitat combined with
ripananyorest supports amphibians
red leggelAfrog (Rana aurora draytonii)
hat likely utiriparian habitat
!n elnereoar Enteus), red -shouldered
Thainnophissp.), among others.
Matadero Creek in the'vicinity nf:the project area supports native and nonnative fishes.
Species of native fish expected to'be present in the reach of creek near the project site
include Sacramento suMe"'i(Catostomus occidentalis) and California roach (Hesperoleucus
symmetricus). Non native f sh�species willim the watershed that may be present in the
creek include blueg7l(Lepomus acrochzrus), green sunfish (Lepomis cyanellus) and
goldfish (Carassius aurgtus), (SVITRPPP 2008).
Suburban forest provides habitat fora variety of wildlife, especially birds such as
mourning dove, Zenaida in6&oura), house wren (Troglodytes aedon), and house finch
(Carpodacus me canus), among others. Remnant native trees, especially larger and older
trees, such as large,Valley oaks (Quercus lobata) and coast live oaks, increase the habitat
value of suburban are."',,,54. rough providing food resources for wildlife in the form of acorns
and insects, as well as' providing important structure for nesting and roosting.
Wildlife observed by sight or sign during the site visits included red-tailed hawk (Buteo
jamaicensis), Cooper's hawk (Accipiter cooperii), hairy woodpecker (Picoides pubescens),
Nuttall's woodpecker (Picoides nuttallii), bushtit (Psaltriparus minimus), scrub jay
(Aphelocoma californica), Bewick's wren (Thryomanes bewickii), brown creeper (Certhia
americana), oak titmouse (Baeolophus inornatus), American kestrel (Falco sparverius),
chestnut backed chickadee (Poecile rufescens), golden -crowned sparrow (Zonotrichia
atricapilla), Audubon's warbler (Dendroica coronata), black -tailed mule deer, Botha's
pocket gopher (Thomomys bottae), and San Francisco dusky -footed woodrat (Neotoma
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fuscipes annectens). Larger carnivore species that may also utilize habitats within the
project area on an infrequent basis include bobcat (Fells rufus), coyote (Canis latrans), and
on rare occasion Mountain lion (Felis concolor).
Owl pellets (possibly from a Great horned owl; Bubo virginianus), were observed beneath
trees #21 and 422 along the trail alignment, adjacent to Arastradero Road on November 29,
2010. Both trees are eucalyptus trees and are proposed for removal. Tree #21 has a
possible raptor nest located at approximately 70 feet in height. Several San Francisco
dusky -footed woodrat nests are located near the trail alignment. All of these nest structures
are outside of the project area however one nest is located within a Coast live oak tree
located along Arastradero Road near Stirrup Way that is proposed,0eremoval.
Many of the wildlife species observed will also utilize ornaiii6il l ,Vegetation, roadside
trees, and suburban yards that are adjacent to the grassland and riparian habitat along the
trail alignment.h�,,.
C. Wildlife Movement Corridors
Habitat loss, fragmentation, and degradation resulting from land use changes or habitat
conversion can alter the use and viability'ofwildlife movement corridors (i.e. linear
habitats that naturally connect and provide'passa a between twq�or`more otherwise
disjunct larger habitats or habitat fragments). Ing neral, studies suggest that habitat
corridors provide connectivity for, and are used by": wildlife and as such, are an important
conservation tool. Accordrngto,Beier and Loe (1992), wildlife habitat corridors fulfill
several functions They maintain' connectivity. or daily movement, travel, mate -seeking,
and migration; plant�propagationi =genetic interchange; population movement in response to
environmental change or natural disaster; and recoflonization of habitats subject to local
extirpation The surtabihty oda Habitat as 7a -wildlife movement corridor is related to,
among other factors; tale habitat corridor's''dimensions (length and width), topography,
vegetation, exposure fo human influence, and the species in question.
Species utilize movement co ndors=4n several ways. "Passage species" are those species
that use corridors as thru-ways between outlying habitats. The habitat requirements for
passage species are generally-,.' than those for corridor dwellers. Passage species use
corridors for brief durations; such as for seasonal migrations or movement within a home
range. As such, movement corridors do not necessarily have to meet any of the habitat
requirements necessary for a passage species' everyday survival. Large herbivores, such
as deer and elk, and medium -to -large carnivores, such as coyotes, bobcats and mountain
lions, are typically passage species. "Corridor dwellers" are those species that have limited
dispersal capabilities — a category that includes most plants, insects, reptiles, amphibians,
small mammals, and birds — and use corridors for a greater length of time. As such,
wildlife movement corridors must fulfill key habitat components specific to a species' life
history requirements in order for them to survive. In general, however, the suitability
and/or utility of the landscape — specifically, of the landscape as corridor habitat — is best
evaluated on a species -level. -
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Movement corridors for resident and migratory wildlife are not expected to be disrupted by
the proposed trail alignment. The trail will not present any obstacles to existing wildlife
movement, and follows an existing footpath along existing roadways for most it's length.
VII. REGULATORY CONSIDERATIONS
Federal and state -listed species (endangered, threatened, fully -protected) receive various
levels of legal protection under the federal and state endangered species acts and the
California Fish and Game Code. The federal Migratory Bird Treaty Act of 1918 and
r max,
Section 3500 of the California Fish and Game Code protect actt+e-nesfs: of migratory and
other birds, and provide criminal penalties for take of hawks, mewls, and take or disturbance
of all bird nests or eggs. Potential impacts to other specialstatus or otherwise sensitive
species must be disclosed and evaluated pursuant to the California Environmental Quality
Act (CEQA).
��
Wetland permitting requirements that may prgyj, e`additiorial protections for species and
habitats include the California Department of Fish'* d'A4,Game, (DFG) 1600 Streambed
Alteration Agreement permit process, US Army Corp'sf`Engm6ers (ACOE) Section 404
permit and the State Regional Water Quality Control B& d (RWQCB) 401 Certification
permit.
A. Federal and State Endangered
The United States Endangered Spaecies Act (ESA) is administered by the United States
Fish and Wildlife S' (USFW1S). The California Endangered Species Act (CESA), the
azo
Native Plant Protection Aft (NA), and CEQA;afford protection to species of concern
included on State , maintained lil?Psts The' �ahfornia Department of Fish and Game (CDFG)
has statuto resp �rs�ibili for theta rotection of State listed species, and is a trustee agency
�� P tY P P � g Y
Both the Federal and State"6fidangered species acts provide protection for listed species. In
particular, the1 ederal act prohibits "take". "Take" is defined by the ESA as "to harass,
harm, pursue, hunt, shoot, wound, kill, trap, capture, or collect a federally listed,
endangered species `of w Idlife, or to attempt to engage in any such conduct." Take not
specifically allowed by Federal permit under Section I0(a)(1)(B) of the ESA is subject to
enforcement througl%°civil or criminal proceedings under Section 9 of the ESA.
While "take" is easily understood in the sense of deliberately capturing or killing
individual animals, Federal regulations also define take to include the incidental
destruction of animals in the course of an otherwise lawful activity, such as habitat loss
due to development. Under those rules the definition of take includes significant habitat
modification or degradation that actually kills or injures wildlife by significantly impairing
essential behavioral patterns, including breeding, feeding, or shelter (50 CFR Section
17.3).
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Section 10(a) of the ESA permits the incidental take of an endangered or threatened
species. Similarly, Section 2081 of the CDFG Code or use of the CESA allows the
Department to enter into management agreements that make lawful activities which may
otherwise result in habitat loss or take of individuals of a state listed species.
B. Species of Special Concern
The California Department of Fish and Game has designated certain animal species as
"Species of Special Concern" due to concerns about declining population levels, limited
ranges, and continuing threats that have made these species vulneirableto extinction. The
goal of this designation is to bring attention to these species 1 hope that their
population decline will be halted through mitigation or pr4Ject redesign to avoid impact.
Species of special concern are protected only through environmental , iew of projects
under CEQA. The California Department of Fish and`,Game=is a trustee agency and is
solicited for its comments during the CEQA process �m
Federal species of concern are any species that may'become. v :ilnerable to extinction on a
National level from declining population trends, limit e, and/or continuing threatsl.
C. Nesting Birds
Nesting birds, including raptors, are protectec
Game Code 3503, which reads, "It is unlawfi
nest or eggs of any birdz excepthas otherwise`]
pursuant thereto." Passerines``a, Inon-passer
Federal MigratoryB~irTreaty Act. As such,
construction surveys for'potentialLy suitable r
removal of trees/vegetations or,indirectly(no
related activrttes�
D. Cdlifornia Environ
%the California Department of Fish and
)'Rake, possess, or needlessly destroy the
vided b""' is code or any regulation made
landbirds are further protected under the
�, DFG typically recommends pre-
,nt
ng habitat that will be directly (actual
disturbance) impacted by construction -
Some specs& &hat are otherwise not protected by the ESA or CESA and do not have a
special CDFG or Fish and Code designation (e.g., fully protected) may still, under
CEQA, be determmed o be significantly impacted by a project. For example, if a project
5;
were to destroy or disturb a roosting site for either a bat maternity colony or a wintering
monarch butterfly colony it could significantly impact the local and/or regional population
of either species. Although loss of an individual bat or monarch butterfly would likely be
considered an insignificant impact, loss of a roost site where multiple individuals are
present may be considered significant. This is because roost sites may be limited in
availability and often have very specific habitat and/or microclimate conditions. When a
roost site is lost, individuals may not be able to find an alternate roost in sufficient time for
protection from the elements before expiring. However unless a roost site has already been
1 This is no longer an official U.S. Fish and Wildlife Service category, but is still considered in this
document because it contains many species that could become threatened or endangered
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studied and the local population of the subject species is well known, the significance of
the loss cannot be readily evaluated. In order to avoid a potential finding of significant
impact to species such as roosting bats or monarchs, all potential habitats should be
seasonally avoided or field surveys should be completed to determine presence/absence.
E. California Native Plant Society and CEQA
The California Native Plant Society (CNPS) has developed a rating system for the state's
rare, threatened and endangered plants. Plants rated by CNPS are subject to protection
under CEQA, and may also be protected by state and federal endangered species laws if
they are listed by the state or federal government. -4
F. Regulated Waters
Impacts to stream channels (bed and bank) are,regulated byythe California Department of
Fish and Game Code §§1600 et seq., and may require�a DFG"Streambed Altezation
Agreement. Impacts to wetlands and streams may A fall under the jurisdiction of the
Clean Water Act §404 permit processand the Porter-Colo%gne Water Quality Control Act.
The U.S. Army Corp of Engineers (USAGE) enforces sions of the Clean
Water Act regulating dredge and fill operation's` The USAGE alsoexerts jurisdiction over
it waters of the U.S. which include territorial al non non tidal waters in
addition to wetlands and drainages that support Wetlandyvegtation, exhibit ponding or
scouring, show obvious signs f channeling, 6r have discernible banks and high water
1 4
w
marks.
The State of California RegionakWater Quality Control Board (RWQCB) enforces permit
provisions of the Porter-CologneWater`,ualty Control Act. Projects that may potentially
impact wetlands m the state of California require a 401 Certification permit. Each 401
Certification is decided o a case�bygcase basis, and is guided by the applicable
s.� � a�
requirements of the CV�A,Porter-Cologne and the regulations.
G.
In urbanized areas, sforinwater runoff is the largest source of pollution to waters in creeks,
ponds and lakes. Pollution caused by stormwater runoff can be controlled through
obtaining and complying with a municipal stormwater permit from the National Pollutant
Discharge Elimination System (NPDES). Controls set forth in the permit offer an
opportunity for development and redevelopment projects to reduce impacts to water
quality.
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H. Town of Los Altos Hills Heritage Tree Designation
Title 12, Chapter 2 of The Town of Los Altos Hills Municipal Code (Section 101), defines
a Heritage Tree as "any tree that, due to age, size, location, visibility, historic nature, or
other unique attribute, has been deemed by the Town to be a heritage tree and accordingly
deserves, special consideration for preservation and protection."
A Heritage Oak is defined as "any tree of the genus Quercus, including, but not limited to,
Valley Oak (Quercus lobata), California Live Oak (Quercus agrifolia), Black Oak
(Quercus kelloggii) and Blue Oak (Quercus douglasii) that has a trunk or multiple trunk
thirty-six (36) inches in circumference (approximately twelve (12)"i &hes in diameter) at a
point four (4) feet above the root crown".M
A permit is required to remove or destroy a Heritage Oak No person shall remove,
purposefully damage, or purposefully cause to die any Heprtage Oak 6n private or public
property within the Town of Los Altos Hills without first having obtained 4gemoval
permit from the Town. A removal permit is not required when:
(a) The Heritage Oak has been identified for
subdivision map or an approved site development f
(b) The City Manager (or design6f,
an immediate danger to persons or propel
immediate danger should call Town Hall
times. (§ 3 (part), Ord. 39, ,eff June 1, 1
Application for a Heritage Oak
of the Heritage Oak(s) fequeste
the requested removal. Such re
HeritageQak isdead diseased;
of theV6 cage Oak bet
obtained tlatthe expense
part of this
L Santa Clara Vi
its r
the a
app
on an approved
e Heritage Oak presents
3eritage Oak presents an
hours and 911 at all other
)ermit shall contain the number, size, and location
noved,Yard a brief explanation of the reasons for
anclude, but not be limited to, the fact that the
clamation, hazardous, or crowded and that good
. If there is a disagreement regarding the condition
Lt and the Town, an arborist's opinion must be
No heritage trees are proposed for removal as
ater District Streamside Standards and Guidelines
In their publication User Manual: Guidelines and Standards for Land Use Near Streams,
the Santa Clara Valley Water Resources Protection Collaborative (SCVWRPC 200 6)2
emphasizes the vital role of riparian vegetation in "maintaining stream stability, providing
valuable wildlife habitat, and moderating downstream flooding", as well as regulating
2 Chapters 2 and 3 of the Guidelines contain the adopted requirements of the Town of Los Altos Hills for
construction near a stream. Chapter 4 contains detailed specifications for use by architects, engineers and
other project designers. Chapters 5-11 do not contain adopted requirements; these chapters are provided as
reference material and background information for homeowners and developers.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
Page 16
water quality by filtering pollutants from stormwater, such as oil and grease from
roadways, fertilizer runoff from lawns, and excess sediments from upstream. Specifically,
the stream -side environment supports riparian vegetation and the functions riparian
vegetation provides. Riparian vegetation benefits terrestrial species, as well as semi -
aquatic amphibians and reptiles and fish. Such habitat functions include:
• Sediment stabilization: provided by riparian trees, shrubs, and grasses;
• Shading and water temperature moderation: provided by mature riparian shrubs and
trees; . �y
Overhanging escape cover: provided by shrubs and �a.�s._ses near the stream edge;
• Coarse particulate organic matter: organic. material dropping to to the stream in the
form of leaves, insects, etc., that provide mput�for.aquatic fod&', ebs;
• Bird breeding and foraging habitat: provided by mature native ripan'an°°species,
such as cottonwoods and willows, oak`s`", other4rees,,rsJ bs, forbs, grasses, and the
stream banks;
• Foraging, refugia, aestivation, d breeding habitat f i,semi-aquatic amphibian and
reptile species: provided by low vegetation, rocks, d6i ed=:materials and the
stream banks; �'�
r,
• Foraging, breeding; `,,hi a, and dispersal haU , t for mammals: provided by
the riparian vegetation ax;dthe stream lank substrate.
J.
The significance criteria arse basd`" inpart on the Environmental Checklist (CEQA
Guidelnes,App endix G [Title 14 CCR;' Section 15000-15387]). These criteria are used to
determirietlieextent to which the proposed project would impact sensitive biological
resources. Tl e ithreshold of)'significance may vary for each species -or habitat, and is
determined by the leadagency. Using these guidelines, the Project would result in a
significant impac k it would:
• Have a substantial adverse effect, either directly or through habitat modifications,
on any species identified as a candidate, sensitive, or special -status species in local or
regional plans, policies, or regulations, or by the California Department of Fish and Game
or U.S. Fish and Wildlife Service.
• Have a substantial adverse effect on any riparian habitat or other sensitive natural
community identified in local or regional plans, policies, regulations or by the California
Department of Fish and Game or US Fish and Wildlife Service.
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• Have a substantial adverse effect on federally protected wetlands as defined by
Section 404 of the Clean Water Act (including, but not limited to, marsh, vernal pool,
coastal, etc.) through direct removal, filling, hydrological interruption, or other means.
• Interfere substantially with the movement of any native resident or migratory fish
or wildlife species or with established native resident or migratory wildlife corridors, or
impede the use of native wildlife nursery sites.
• Conflict with any local policies or ordinances protecting biological resources, such
as a tree preservation policy or ordinance.
• Conflict with the provisions of an adopted Habitat Conservation Plan, Natural
Community Conservation Plan, or other approved local, regional; or state habitat
conservation plan. M;
VIII. SPECIAL STATUS PLANTS, AINIMALS, AND NA'
COMMUNITIES r
The California Department of Fish an4,, e (CDFG) N*oj Diversity Data Base
(CNDDB) maintains records of reported�,occurrences of sensithve plant, animal and natural
plant communities of concern. CNDDB records'kprovide useful niformation about what
species have been found in a given project area,, afid" hat species may be expected in
similar habitat types. An area that has not been�surveyed,o .visited may support sensitive
species that have not be&n d s°covered and reported, and may require site-specific surveys
to rule out special status species occurrences The U. S. Fish and Wildlife Service
(USFWS), Sacramento; also maintains lists of liked, species and other species of concern
BEY
that may occur in or be affected byp�ro�ects in a given USGS topographic quadrangle.
t;.
CNDDB,=tecords for the Palo A167.5 minute topographic quadrangle and eight
surrounding quadrangles were reviewed``for sensitive element occurrences on the project
site (CDFG:2010x). Reviewof the U`Fish and Wildlife Service list of endangered and
threatened species for the nine 7.5 minute quadrangles, and the CNPS on-line Inventory of
Rare and Endangered Plants (CNPS 2010) was also conducted.
Special status speciesythafwere identified in the region as having at least some minimal
potential for occurrence based on proximity to the site, or similar habitat utilization were
included in Appendix B. Special -status species that have a higher probability for
occurrence onsite, based on habitat types and/or recorded observations within.5 miles of
the property are discussed in greater detail below. Special status species found exclusively
within habitats not present on the property (i.e. sand dune, serpentine grassland, salt marsh,
freshwater marsh and/or marine habitats, etc.) were excluded from analysis due to the lack
of these habitats on or adjacent to the property.
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• There is potential for one federally listed species, the California red -legged frog,
(Rana aurora draytonii) and one state fully protected species, white-tailed kite
(Elanus leucurus) to utilize the project area.
One non -listed special status species was found to occur within the trail alignment,
the San Francisco dusky -footed woodrat (Neotoma fuscipes annectens). Four
additional non -listed special status wildlife species were identified as having
potential for presence within the project area, Cooper's hawk (Accipiter cooperii),
loggerhead shrike (Lanius ludovicianus), western red bat (Lasiurus blossevillii) and
pallid bat (Antrozous pallidus),. A
• Eight species on various watch lists that also have potenti
project area include fringed myotis (Myotis thysanos);rl
(Myotis volans), hoary bat (Lasiurus cinereus), Yuma bat
long-eared bat (Myotis evotis), California thrasher (Toxos
woodpecker (Picoides nuttallii) and oak titmouse (Baeolo
Two special status plant species: western
Francisco collinsia (Collinsia multicolor)
occur within the project area..
• One rare plant community, Centf.WC
k=k
lasiandra Alliance) was identified`i
alignment.'ry'
x
;s�
Three additional federally andlor'srtate listed
and are included inAhe" iscussion'These are
sirtalis tetrataenia), Cahfomia tiger saiaman
(Oncorhynchus mykts�s irideus,1Though to
discussionof each"is provided because they
detected in the region (CFG 2010a)
A.
for presence within the
g -legged myotis
191is yumanensis),
na redivivum), Nuttall's
irca occidentalis) and San
as having potential to
alix lucida ssp.
adjacent to the trail
;cies are a high priority for conservation
n�Francisco garter snake (Thamnophis
( mbystoma californiense) and steelhead
pecies are not expected to occur on site, a
federally listed species and have been
The California r6d4egged frog (CRF) is a federally listed Threatened species and a
California Species' 'of Special Concern.
Red -legged frogs ar&known to occur in slow -flowing streams, and marshes with heavily
vegetated shores for breeding as well as grasslands, riparian woodland, oak woodland and
coniferous forests. These frogs stay near the shore hidden in vegetation rather than in open
water. Seasonal bodies of water are frequently occupied by red -legged frogs, and in some
areas these may be critical for persistence. It is speculated that California red -legged frogs
may lie dormant during dry periods of the year or during drought. California red -legged
frogs are thought to disperse widely during autumn, winter, and spring rains. Juveniles use
the wet periods to expand outward from their pond of origin and adults may move between
aquatic areas. Frogs disperse through many types of upland vegetation and use a broader
range of habitats outside of breeding season. CRF have been observed to move extensively
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and travel up to 2 miles or more between breeding ponds without apparent regard to
topography, vegetation type, or riparian corridors (Bulger in litt.1998, in USFWS, 2002).
The breeding season for CRF generally begins in January and lasts through March.
Minimum breeding age appears to be two years in males and three years in females
(Jennings and Hayes 1985). Females lay 750-4000 eggs in clusters attached to aquatic
vegetation, two to six inches below the water surface. Eggs hatch in two to three weeks.
Once hatched, the tadpoles generally take between 11 and 20 weeks to metamorphose,
doing so between May and August. Although most tadpoles are expected to transform in
the summer, they can also over -winter, so transformation can take from about 4 to 13
months. CRF typically require a permanent water source with a rri ri u,m depth of 0.7
meters (2.5 feet) (USFWS 2004). Successful breeding has bee,
n,abserved in sub -optimal
habitats with little or no emergent vegetation present (USFWS'2004). In the absence of
vegetation CRF will attach their eggs to rocks, wood or other debfi
CRF has been extirpated from 70 percent of its former range and now is fond primarily in
coastal drainages of central California, from Marin County,,�California, so&4jp northern
Baja California, Mexico. Potential threats to the species include elimination or�Hegradation
of habitat from land development and land use activities: and habitat invasion' by non-native
aquatic species (USFWS 2002).
The project area is outside of CRF Cri icaT.Habitat (USFWS'2005) > The nearest recorded
observation of CRF (Occ. #230 ; 200 1) isJocati anatxMatadero Cre k, approximately 1.0
miles northeast of the project site (CDFG 20104) ,'�.`Both,adults and tadpoles were observed
at this site between 1997 and 20:01. There are several more observations of CRF that have
been recorded withinSimles -oche project area including sightings in Bear Creek and San
Francisquito Creek (CDFG 20109. There are also several additional creeks and ponds
within the Los Altos Hills; Woodside and PortoWX alley area that provide potential habitat
for CRF.. a
There is po ential habitat %r CRF"to, occur within the section of Matadero Creek that is
adjacent to the project area`Because CRF can utilize upland habitats and travel up to 2
miles when dispersing from,breeding areas, there is potential that CRF to occur within the
trail alignment when dispersing in the rainy season. Avoidance and minimization measures
should befollowed to insuraRF are not impacted by the proposed trail project.
B. California Tiger
California tiger salamander (Ambystoma californiense; hereafter referred to as CTS) is a
large, terrestrial salamander with a black body and white to yellow spots and bars
(Stebbins 2003). The Central California Distinct Population Segment (DPS) is state and
federally -listed as Threatened (USFWS 2010b; CDFG 201Ob) and is designated as a
California Species of Special Concern. California tiger salamanders are distributed
throughout the Central Valley and Central Coast ranges from Colusa County south to San
Luis Obispo and Kern counties from sea level to 1054 meters (3,460 feet) in elevation.
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Two disjunct populations are located within Sonoma County and Santa Barbara County,
which are geographically isolated from the Central Valley population.
California tiger salamanders inhabit lowland grasslands, oak savannah, and mixed
woodland habitats, and require vernal pools, seasonal ponds, or semi-permanent calm
waters that pond water for a minimum of three to four months in duration for breeding and
larval maturation, and adjacent upland habitat with small mammal burrows for aestivation
(Storer 1925, Barry and Shaffer 1994, Stebbins 2003).
California tiger salamanders begin migrating to breeding site
autumn rains typically in November, and have been documen
1.6 km (Austin and Shaffer 1992). Eggs are laid singly or in
bottom or attached to individual strands of vegetation (Storer
1991, Barry and Shaffer 1994, Jennings and Hayes 1994) 1V1
minimum of ten weeks following hatching and younginigrat
pools begin to dry in late spring or early summer (Faver 1"97
Stebbins 2003). Juveniles and adults aestivate through the su
small mammal burrows, most frequently created MZ�by.� Californ
(Spermophilus beecheyi) or pocket gopher (Thomotif spy )
and Shaffer 1994, Jennings and Hayes 1994, Stebbins 2003,).
are at risk of extinction due to loss of Habitat from develoriir e
lands, habitat fragmentation, and introduction of preda
mosquitofish (Gambusia affinis), bullfrogs (Ranaicate,
crayfish (Procambarus clarkii) (Zeiner, et al. 1988,51
Hayes 1994).
Critical habitat fonthe,?Central California DPS of�CTS
2005) and there are ten'critical habitat units within' Sa
does not overlan.,with an "41 unitnfor CTS.
The
2.3
Lagunita, approxi
detected at Felt
aestivation habits
expected to occur
s following the onset of
tedItraveling distances up to
S" clusters on the pond
r �.�
192:;�Shaffer and Fisher
eta osis occurs a
e in mass vl en temporary
1, Jennmgsaiad Hayes 1994,
miner and faliktvpcally in
Shaffer, et al. f993, Barry
California tiger salamanders
rit of agriculture and grazing
itq.-, ecies such as
)sand Louisiana red swamp
Cal. 1993, and Jennings and
was designated in 2005 (USFWS
nta Clara County. The project area
record of CTS,;(Occ. #63; 2005) is from Lake Lagunita,
les northeast ofith'edproject site (CDFG 2010a). CTS have also been
MAC
More ponds on'the west side of Junipero Serra Boulevard near Lake
el y 2.1y miles northeast of the project site. CTS have not been
(pers.;comm. Dr. Alan Launer). No breeding or suitable summer
)resent on site or in the immediate project vicinity and CTS is not
or adjacent to the project area.
C. San Francisco Garter Snake
The San Francisco garter snake (SFGS) is federally and state listed as endangered and is a
fully protected species under §5050 of the California Fish and Game Code. A highly
aquatic subspecies of the common garter snake endemic to the San Francisco Bay Area,
San Francisco garter snakes are distributed along the western San Francisco Peninsula
from the southern San Francisco County border south to Waddell Lagoon south of Ano
Nuevo and as far west as Crystal Springs Reservoir. It occurs sympatrically with its
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primary prey species, the California red -legged frog (Rana aurora draytonii); however, it
will opportunistically prey on a variety of species including frogs, tadpoles, egg masses,
newts, small fish, salamanders, reptiles, small mammals, birds and their eggs and several
small invertebrates (Stebbins 2003).
San Francisco garter snakes prefer densely vegetated habitats close to water where they
can retreat when disturbed (Stebbins 2003). The species often occurs near ponds, marshes,
streams and other wetlands associated with cattails (Typha spp.), bulrushes (Amphiscirpus,
Bolboschoenus, Isolepis, Schoenoplectus and Trichophorum spp.) and rushes (Juncus and
Eleocharis spp.). Mating occurs shortly after they leave their winter retreats in May and
females give birth to live young between June and September. Species<,may hibernate near
the coastal areas in fossorial mammal burrows and other refuge ;'or remain active year-
round, weather permitting.
San Francisco Garter snakes are usually found
large populations of Pacific tree frog (Hyla rel
which serve as prime food sources. Recent re,,
Environmental documents that SFGS will also
Critical habitat has not been designated for this
The nearest recorded observation of SFGS
approximately 4.0 miles west of the project
occurrence within the region is located apf
site on a private property on;,Portola Road.
The closest aquatic -habitat that
project area is MataderofCreek,
California red legged frog whiff
snake, is un`likel`y to supportSa
and/or pond habitat associated
specjes exists within the vicinit
project area': `4
D. Steelhead
d marshes that support
iia red legged frog, both of
by Sean Barty.ofEssex
(Rana catesbtgna).
near the Stanford Linear Accelerator,
DDB 201 Da) The only other
51 miles northwest of the project
potentially support SFGS within the vicinity of the
habitat, though it has been documented to support the
ri unporta 'i"prey species of the San Francisco garter
iciscd garter snakes due to a lack of suitable marsh
he creek. No other potentially suitable habitat for this
s"species is not expected to occur on within the
Steelhead (Oncorhynchus mykiss irideus) within the Central California Coast ESU was
federally -listed as threatened on August 18, 1997. The Central California Coast ESU
Ecologically Significant Unit (ESU) includes all naturally spawned populations of
steelhead (and their progeny) in California streams from the Russian River to Aptos Creek,
and the drainages of San Francisco and San Pablo Bays eastward to the Napa River
(inclusive), excluding the Sacramento -San Joaquin River Basin (NOAH 2O05a). Critical
habitat, designated on February 16, 2000, is designated to include all river reaches and
estuarine areas accessible to listed steelhead in coastal river basins from the Russian River
to Aptos Creek, California (inclusive), and the drainages of San Francisco and San Pablo
Bays. Also included are adjacent riparian zones, all waters of San Pablo Bay westward of
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
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the Carquinez Bridge, and all waters of San Francisco Bay from San Pablo Bay to the
Golden Gate Bridge (NOAA 2005b). Excluded is the Sacramento -San Joaquin River
Basin of the California Central Valley, as well as tribal lands and areas above specific
dams or above longstanding, naturally impassable barriers (i.e., natural waterfalls in
existence for at least several hundred years). Major river basins containing spawning and
rearing habitat for this ESU comprise approximately 6,516 square miles in California. The
following counties lie partially or wholly within these basins (or contain migration habitat
for the species): Alameda, Contra Costa, Marin, Mendocino, Napa, San Francisco, San
Mateo, Santa Clara, Santa Cruz, Solano, and Sonoma.
Steelhead are anadromous fish that migrate from the ocean into
spawn (Moyle 2002). Rainbow trout refers to the resident fo
lakes or streams and does not migrate to the ocean. Steelhead
.M
beds) at the head of riffles where water is well oxygenated and
water provide safe refuge for juveniles. Optimal temperatures
While in freshwater streams, steelhead feed on drifting aq atic
insects and bottom dwelling invertebrates (Moyle 2002). Migr
migrate to the ocean after spending 1-3 years in th eii,natal fire l
remain in the ocean for 1-4 years prior to returning tdntheir?natr
neighboring streams, to spawn. Unlike salmon, steelhead ofter.
once.
The Santa Clara Hydrologic Unit inclu
in Palo Alto eastward to Coyote Creek
region, but is excluded from this critical
steelhead ESU..
Matadero Creek waters:
steelhead continue to er
residents ($CBIA,Mz2Q
culverts nave drastichlb
not eCpected to support
tributarytto'Matadero C
steelhead currently, or 1
watershed (Lead -y ;,,,,,et al,
E. San Francisco D..us,
tresh,`vvater streams to
rm�of the species that inhabits
bmld.redds (i.e., spawning
nebyx.pools with deeper
for �xovth_are 15-18°C.
or occasionally to
return to spawn more than
fr6iif San Francisquito Creek
tadro Creek occurs within this
for Central California Coast
steelhead run in the past and
;co Bay, according to local
1) C, ftelizatiori `'flood control projects, and barriers such as
�educed"Tsh habitat (SCBWMI 2001). Currently this watershed is
steelhea&population (Leidy, et al, 2005). Deer Creek, a small
�ek on the ;east side of the trail alignment, is unlikely to support
�u
sally, due to the steepness and low flows of this small
Woodrat
The San Francisco dusky -footed woodrat is a California species of special concern and is
one of eleven recognized subspecies. The San Francisco dusky -footed occurs in the Santa
Cruz Mountains and in the East Bay hills. The dusky -footed woodrat is generally a
nocturnal mammal that occurs in a variety of brushy and wooded areas. They inhabit oak
and riparian woodlands, coastal scrub, and chaparral habitats with a well-developed
understory. The woodrat builds stick structures (`houses') for nesting up to 2 meters long
and a meter in height that may last for tens of years. These stick houses are constructed on
the ground, within shrubs and trees, tree hollows, rock crevices and sometimes in human
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BRA for Town of Los Altos Hills C-2 Trail I Arastradero Rd. Pathway Improvements— January 2011
Page 23
structures such as wood sheds. The elaborate stick houses help protect the woodrat from
seasonal temperature extremes and predators. Woodrats exhibit high site fidelity and are
highly arboreal. They are generalist herbivores and live in loosely -cooperative societies.
The dusky -footed woodrat eats primarily woody plants, including leaves, flowers, nuts and
berries. Coast live oak trees are an important food resource for this species.
Several San Francisco dusky -footed woodrat nests are located near the trail alignment. All
of these nest structures are outside of the project area however one nest is located within a
Coast live oak tree located along Arastradero Road near Stirrup Way that is proposed for
removal.
F. Raptors and Nesting Birds
No special status birds were observed on the pi
potential habitat for several special status birds
kite, Cooper's hawk, and sharp -shinned hawk 1
White-tailed Kite
This species potentially nests within gi
of Woodside and Portola Valley. Whit(
shrubs and trees. The species is a year -
This species was not observed during t
suitable foraging and nesting habitat is
Cooper's Hawk
However the property provides
special status raptors.;. white tailed
�ve,potential,to utilize the propezty.
and oak savannah habitats in the foothills
ites forage over grassland and nest in
�ident of Central; and Coastal California.
surveys' ofthe property however potential
hong the trail alignment.
The species inhabits dense stands of o"ak�Woodlaads, riparian deciduous forests, or other
forest habitats`-bften near water and suburban areas (Baicich & Harrison 2005). This
woodladd raptor hunts � � b Token Noodlands, along forest edges and suburban areas for
medium -,sized birds anis',�T.y,.pical nest site selection is characterized by mature
trees with. ,,,ificant canopy;-,coverAlthough, species will nest in suburban areas in a
variety of trees (Curtis et al¢,F2006). One Cooper's hawk was observed flying near the
� .s
easternboundary of the property on November 29, 2010. There is potentially suitable
foraging and neshag?habita for this species along the trail alignment.
Loggerhead Shrike
The loggerhead shrike is designated a California Species of Special Concern by the
California Department of Fish and Game (CDFG 2010b). Loggerhead shrikes inhabit a
variety of habitats from open grasslands and scrub to woodlands and riparian areas (Yosef
1996, Baicich & Harrison 2005). This species is a year-round resident throughout much of
California; however, population declines have been observed in the San Francisco Bay
Area in areas where oak savannah habitat has been lost (Shuford and Gardali 2008). Trees,
shrubs, and fence posts are important habitat features, which serve as hunting perches and
an announcement site for territory pair maintenance (Shuford and Gardali 2008). Breeding
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begins in February and is double- to triple -brooded (Baicich & Harrison 2005). There is
potentially suitable nesting and foraging habitat within the project area.
Other Migratory Birds
The native plant communities and ornamental vegetation on the property provide potential
nesting habitat for a variety of native songbirds, raptors and other species. Species
observed that may forage and nest within the project area include red-tailed hawk,
American kestrel, oak titmouse, Nuttall's woodpecker, Bewick's wren, bushtit, scrub jay,
Oregon junco, chestnut -backed chickadee, Anna's hummingbird, Stellar's jay, scrub jay,
and spotted towhee, among others.
G. Bats
Potential bat roosting and foraging habitat is local
resent within the project area and on ad acent, h
P P j j Ph
suburban forest). Two special status bat specie's,"
within the project area, pallid bat and western red
Pallid Bat
The pallid bat is a California Species of She
Bureau of Land Management Sensitive Spe
Western Bat Working Group (CpFG 2010b
The pallid bat is fgilnihin,a
oak savanna, grassland, lip
cropland if appropriate rood
occupies a wdvariety„ of 1
woodlapds, and forests Th
q
necessary for roosting Roy
moderate pffi tial for pall
Trees proposed f
suitable roosting
Western Red Bat
on the property
to have
habitats
to occur
and azsS. Forest Service and
gh_Priority species by the
et��r of habitats if all types of woodland especially
"'teas and wetlai ds, orchards, vineyards, and irrigated
sitesaravailalle. A very social bat, the pallid bat
r is througlioizt California, including grasslands, shrublands,
cies is most common in open, dry areas with rocky areas
in rot --Crevices, caves, mine shafts, under bridges, in
eedss'on a variety of insects and arachnids. There is
is to use the property for roosting and foraging.
were visually inspected for tree hollows and did not provide
this species.
The western red bat is designated as a California Species of Special Concern by the
California Department of Fish and Game and a High Priority species by the Western Bat
Working Group (CDFG 2010b).
The western red bat is easily distinguished by its distinctive reddish coloration. Roosting
typically occurs individually in dense clumps of tree foliage in riparian areas, especially
willows, cottonwoods and sycamores, and within orchards and suburban areas in trees and
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BRA for Town of Los Altos Hills C-2 T7 -ail /Arastradero Rd Pathway Improvements -- January 2011
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shrubs. Roosts are often hidden from view -and only access from below (Bolster 2005). Red
bats are primarily moth specialists, but individuals will forage for a variety of other insects.
Individuals have been observed foraging around street lamps and flood lights in suburban
areas (Bolster 2005). The western red bat migrates long distances, but has been reported to
overwinter in the Bay Area with interspersed winter foraging bouts on warm days (Bolster
2005).
The property provides habitat for additional species that are on watch lists including
fringed myotis, long-legged myotis, long-eared myotis, Yuma myotis and hoary bat.
Additional bats within the region may utilize the property such as Mexican free -tailed bat
(Tadarida brasiliensis), big brown bat (Eptesicus f ascus) and othersrxThough these species
do not have protected status under ESA or CESA, impacting a roosting bat colony could be
S?F 'y
considered a significant impact under CEQA, due to the limuted'ainount of suitable
� i a
roosting habitat and the slow reproductive rate of bats. € '
H. Monarch Butterfly
Monarch butterfly is not a state or federally listed species,,iowever due to its unique life
history and habitat requirements it is given special consideration under the California
Environmental Quality Act (CEQA) review process. Winter roost sites extend along the
western coast from Mendocino in northern'Cahfornia, south taBald California, Mexico.
Roost habitat consists of wind -protected tree grow s,typically eucalyptus (Eucalyptus
globulus), Monterey pine (Pinus radiata) and Monterey`Cy&press (Cupressus macrocarpa),
with nectar and water sources nearby. Roost sites consist of congregations of several
hundred to several thousand 'ada,ybutterflies Tong the Central California coast, monarch
butterflies typically,566st betwe4 October ands ebruary.
The closest record of amonarch ro st srt6s located at Ardenwood Farms Regional
Preserve Jrf.�N,NbiVark;l roximately 13.3 miles northeast of the site (CDFG 2010a). The
row of Eucalyptus tree`s%algng Arastradero Road provides potential habitat for monarchs,
co
however monarch roost sites typical.y'nsist of groves of trees that are protected from the
wind, with",,. ectar and water sources'nearby. These habitat components are not present
w.ithm the project area. No Monarch butterflies were observed during biological surveys in
November a4%,tember 2010, and trees proposed for removal along the trail alignment
su
are unlikelyto rt,monarch butterflies.
PPS ,:
L Special Status Plants and Rare Plant Communities
No special status plant species were observed on the property, however the property was
surveyed in the fall, when many plants, especially annuals, are past their bloom stage, and
are less visible. Two special status plants were determined to have potential for presence on site
based on habitat types. These are western leatherwood (Dirca occidentalis) and San Francisco
collinsia (Collinsia multicolor).
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd Pathway Improvements -- January 2011
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One rare plant community, Central Coast Riparian Scrub (Salix lucida ssp. lasiandra
Alliance), was identified within the project area (Holland 1986; CDFG 2006; CDFG
2007).
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BRA for Town of Los Altos Hills C-2 T7 -ail /Arastradero Rd. Pathway Improvements -- January 2011
Page 27
IX. Recommended Avoidance and Minimization Measures
No impacts are anticipated to special status species or natural communities as a result of
the proposed trail project. Potential impacts and recommended measures to mitigate
impacts to special status species are provided below.
• BIO -1 - Pre -construction Biological -Resources Awareness Training A biological -
resources awareness training shall be presented to all construction personnel prior
to the initiation of construction activities. The training shall be provided as
follows:
The training shall be developed and provided
the special -status species that may occur in tb
be language -appropriate for construction Pers
the training prior to conducting any work m the work,4rea boundary; including tree
trimming, demolition, vegetation clearing andsgradmg .The training s ail provide
educational information on habitats and the natrallhistory of the special -status
work area, a`discussion of required impact
tahfied biologist familiar with
area. Training materials shall
All personnel shall complete
species potentially occurring in,,the
avoidance measures, lines of ed r,
penalties for noncompliance. If ne-
project, the contractor shall ensure
start working. As an. alternative to
training of new perscinn'el» can
and/or reviewi # written- ate
A.
and authority, and a discussion of
tion personnel are added to the
personnel receive training before they
trainWy a biologist, subsequent
ng avI
ideotape of the initial training
by the project biologist.
Potentialirnpacts to California red -legged frogs can be avoided and/or minimized by
IV
implementing minimization and avoidance measures (USFWS 1999b). To the maximum
extent practicacan
hle_the applit shall follow the following measures:
• BIO -2 - AlIgraund`disturbance associated with trail building activities on site will
be conducted , ring the dry season (April 15 - October 15).
• BIO -3 - Staging areas and access routes to the work area will be delineated and
inspected by the project biologist prior to establishment to avoid unnecessary
impacts to California red -legged frogs and their habitat.
• BIO -4 - Exclusion fencing will be erected around portions of the construction site
adjacent to Matadero Creek and Deer Creek prior to the onset of project activities.
Fencing will be a minimum of 3 feet in height and buried in the soil 4 to 6 inches to
inhibit California red -legged frogs from entering the project area.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
Page 28
• BIO -5 - Once the exclusion fence is installed, a pre -construction survey will be
conducted to ensure that no California red -legged frogs are present in the project
area.
• BIO -6 - If California red -legged frogs are detected on site, the USFWS would be
contacted for guidance on moving the animal(s) to a safe location. No CRF would
be handled without permission from the USFWS.
• BIO -7 - During project activities, all trash that may attract predators will be
properly contained, removed from the work site and disposed of.>regularly.
Following construction, all trash and construction debns will be removed from
work areas._
• BIO -8 - All practicable erosion control Best 1Vlanageinent Practices (BMPs) will be
implemented to minimize the potential of nnpacts to water quality o£Matadero
Creek and Deer Creek.' b.
• BIO -9 - No smoking except in vehicles will lie permitted within vegetated areas.
Uk
• BIO -10 -Trash dumping will beprohibited. �
B. San Francisco Dusky footed Woodrat
y .
,r
• BIO -11 - Woodrat nests within 100 feapf ground disturbing activities shall be
,, i�` �Y i
surveyed and monitored to determine if nests are active.
wi12, �ForTwoodrat nests thaf�canJ$ avoided, orange construction/ protective
ing will be placed `beveen work areas and woodrat nests, and will include a 2 -
buffer between the protective fencing and the nest.
BIO 13 - For woodiif nests that cannot be avoided, woodrat nests shall be
dismantled by a qualified biologist. Dismantling will be conducted during the time
of year thati would least impact breeding woodrats (i.e. late fall/ winter:
November/D:eeeb ber/January). Dismantling will be conducted slowly to avoid
impacting neonate woodrats. If woodrat neonates are detected in the nest,
dismantling will cease and the nests will be checked every 48 hours to determine if
the neonates are still present. Dismantling will continue once it is determined that
the neonates are no longer present and have either been weaned from their mothers,
or the mothers have moved them from the nest.
• BIO -14 - DFG shall be consulted if any San Francisco dusky -footed woodrats
(adults, subadults or neonates) are harmed by project activities.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
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C. Protection of Special Status Raptors
The trees and shrubs on the property provide potential nesting habitat for birds including
raptors such as Cooper's hawk and white-tailed kite. Ground disturbance and construction
activities on the property could impact nesting birds, including raptors.
• BIO -15 - If ground disturbance activities are proposed during the bird nesting
season (February 1 — August 31), then preconstruction surveys for nesting birds
including raptors such as white-tailed kite and Cooper's hawk, shall be conducted
by a qualified biologist within 300 feet of the construction area, where access is
available, within two weeksprior to construction.drs.
BIO -16 - If active bird nests are found, and project activities{could potentially
impact nesting success, appropriate no -activity buffer zones shall be established
around active nest (s). Typical no -activity buffer`zones are 300 feet for active raptor
nests. If project activities would be conducted within these buffer zones, the US
Fish and Wildlife Service Migratory BirdTreaty Office and the Department of Fish
and Game will be consulted for guidance and all necessary permits would be
obtained.;_
D. Protection of Migratory Birds
The native plant communities and ornamental vegtatro on theproperty provide potential
nesting habitat for a variety of native songbirds, raptors and other species.
• BIO -17 —If ground disturbance activities are proposed during the bird nesting
season (FebrddiY, I August 31), then p econstruction surveys for migratory birds,
shall be conducted by a lifi For migratory raptors including red-
tailed hawk, surveys shall be conductedwithin 300 feet of the project area where
r
access is available. For non -raptor migratory bird species, surveys shall be
" conducted within (DO feet Q th project area, where access is available. Surveys for
migratory birds shalibeconducted within two weeks prior to any ground
disturbance, tree reruoval and/or tree pruning activities within the project area.
BIO -18-. If active bird nests are found, and project activities could potentially
impact nestingNsuccess, appropriate no -activity buffer zones shall be established
around active nest (s). Typical no -activity buffer zones are 300 feet for active raptor
nests, and 100 jfeet for active migratory bird nests. If project activities would be
conducted within these buffer zones, the US Fish and Wildlife Service Migratory
Bird Treaty Office and the Department of Fish and Game will be consulted for
guidance and all necessary permits would be obtained.
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E. Protection of Special Status and Non -Special Status Bats
The property provides potential habitat for roosting bats. There are several trees on the
property that may provide day and/or night roosts for special status and non -special status
bat species.
BIO -19 - To avoid impacts to roosting bats within the project area, including pallid
bat and western red bat, pre -construction surveys for roosting bats shall be
4;: " .,
conducted by a qualified bat biologist within two weeks fpiorfto; any ground
disturbance, tree removal and/or tree pruning activities;within the project area. Any
tree removal on site shall be done according to the Te"Comrnendations of the
qualified bat biologist. If active bat maternity roosts aredetected (this season is
Typically between April and August) within a tructuie or tree that will be impacted
by the project, the roost would need to be avoided until all young are^„volant, and
the Department of Fish and Game will beconsulted`'for permission itheiise of any
bat exclusion devices. ro,
F. Protection of Special Status
BIO -20 — To avoid impacts to speoial
and western leatherwood), one or A
by a qualified biologist”prior to any g
within the protect area.1TJjip survey (s
time of year (� a tibloom pe, iod) to del
leatherwood.
.:- .
dant specie.', (San Francisco collinsia
Q&on surveys shall be conducted
sturbance and/or vegetation removal
be timed to occur at the most suitable
Francisco collinsia and western
=21 IfSan Francisco-collinsia and/or western leatherwood are identified
in the projectarea, aad�one or more individual plants could potentially be
acted by project activities,the California Native Plant Society and the
!rtment of Fisl Arid Game will be consulted to develop appropriate mitigation
aures, Mitigation;.measures may include seed/plant material collection,
agiff r nd replanting in an appropriate restoration area(s).
G. Heritage Tree Permit -- Town of Los Altos Hills
The Town of Los Altos Hills Municipal Code stipulates that the removal of heritage trees
is prohibited without a permit. No heritage trees would need to be removed to
accommodate the proposed project. To avoid impacts to any trees adjacent to the project
alignment the following avoidance and mitigation measures are recommended:
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Patlnvay Improvements -- January 2011
Page 31
• BIO -22 - An arborist shall perform an analysis of all proposed ground disturbance
activities and prepare a report outlining protective measures during construction to
preserve the health and vigor of all native trees to remain.
• BIO -23 - The project proponent shall secure a Tree Removal Permit from the Town
of Los Altos Hills prior to removing any heritage tree or grading within the dripline
of any heritage tree.
BIO -24 - During construction, accidental injury or removal of heritage trees shall
be reported immediately to the Town and appropriate measures taken, as identified
by the Town, to mitigate the non -permitted damage andyta`prevent further
accidental impacts. f
H. Protection of Regulated Waters and Wetlands
While the proposed project does not include any inychannel work or grade alteration or
construction below the top of bank, indirect effectsron the aquatic environm,64,pf
Matadero Creek and Deer Creek could result from prosect u7nplementation. In addition,
direct and indirect impacts to California red -legged frog habitat within Matadero Creek
could be considered significant under CEQA guidelines: '
Project implementation could affect the regulatexd-waters and wetlands in the following
ways: "..4.._
• Erosion from the,j
creek channels, adversbly
species.
the
indirectly impacting aqua
a
In order to avoid indirect
below shall MinDlemen
not
during construction could release sediments into the
the aquatichabitat and indirectly impacting aquatic
t"`o11 and grease, or other contaminants during
channels, adversely affecting the aquatic habitat and
waters and wetlands, the measures outlined
h the incorporation of these measures, project
in any inadvertent impacts on downstream water quality.
• BIO -25 - Undpf'io circumstances shall spoils, gravel, paving materials or other
construction materials or debris be placed, even temporarily, along or below the top
of bank of the creek.
• BIO -26 - Best Management Practices (BMPs) to prevent pollutants, construction
materials or debris from entering the creek and storm drains shall be installed prior
to the initiation of work and properly maintained.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd Pathway Improvements -- .Ianuaiy 2011
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I. Exclusion of Invasive Species
The following measure is recommended to avoid impacts from introduced invasive plant
species:
• BIO -27 - The project proponent shall avoid planting ornamental species reported
by the California Invasive Plant Council to have the potential to be invasive.
Species on this list shall be prohibited from use in landscaping.
J. Wildlife Corridors
The proposed project would not create any i
wildlife corridors through the project area.
existing
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
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X1. REFERENCES
Austin, C. C. and Shaffer, H. B. 1992. Short-, Medium- and Long-term Repeatability of Locomotor
Performance in the Tiger Salamander Ambystoma californiense. Funct. Ecol. 6, 145-153.
Baicich, P.J. and C.J.O. Harrison. 2005. Nests, Eggs, and Nestlings of North American Birds.
Second Edition. Princeton University Press. Princeton, New Jersey. 347 pp.
Barry, S. J., and H.B. Shaffer. 1994. The Status of the California Tiger Salamander (Ambystoma
californiense) at Lagunita: a 50 -year Update. Journal of Herpetology 28:159-164.
Beidleman, L.H., Kozloff, E. N. 2003. Plants of the San Francisco Bay Region. University
of California Press, Berkeley, California
Beier, P. and S. Loe. 1992. A Checklist for EvaluatingImpacts to Wildlife Movem nt yCorridors.
Wildlife Society Bulletin 20(4):434-440.
Bildstein, Keith L. and Ken Meyer. 2000:;=Sharp-Shinned Hawk"'(Accipiter striatus), The Birds of
North America Online (A. Poole, fid .i Ithaca: Cornell Lab `Df Ornithology; Retrieved from
the Birds of North America Online:'http`fllinabirds.comell ed. na/species/482.
Bogan, M. A., E. W. Valdez, and K.W. Navo. 2005 .Xuma_N4yotis (Myotis evotis). Species
Account. Western-A&Working Group
�1L .: 61
http://www.wb�w`g,org/speciesinfo/species Eaccounts/vespertilonidae/myyu.pdf.
* yry
Bulger, J. 1998. Wet season dispersal and habitat useby juvenile California red -legged frogs
(Rana auroira draytonii) an for an'dRrangeland habitats of the Santa Cruz Mountains. A
research proposes submittedAo the U.S. Fish and Wildlife Service, Sacramento, California.
nent of Fish and GarWO I Oa. California Natural Diversity Database (CNDDB).
search for te'Palo Alto 7.5 minute topographic quadrangle and eight
M
ng quadrangle's December, 2010. Data expiration January 3, 2011.
2010b. SpeciA,kAnfmals. California Natural Diversity Database. Wildlife and Habitat Data
Analysis Branch: July.
. 2007. Vegetation Classification and Mapping Program, List of California Vegetation
Alliances, October 22, 2007
2006. Rare Plant Communities, California Natural Diversity Database, March.
Cal -IPC, 2010. California Invasive Plant Inventory Database.
http://www.cal-ipe.org/in/inventory/weedlist.php
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements --January 2011
Page 34
CNPS. 2010. Inventory of Rare and Endangered Plants (online edition, 8th Edition, released
December of 2010). California Native Plant Society. Sacramento, CA. Accessed from
hM2://www.rareplants.enps.org/
Cowardin, Lewis M., Virginia Carter, Francis Golet, and Edward LaRoe. 1988. Classification of
wetlands and deepwater habitats of the United States. Office of Biological Services, US
Fish and Wildlife Service, Washington, D.C.
Curtis, Odette E., R. N. Rosenfield and J. Bielefeldt. 2006. Cooper's Hawk (Accipiter cooperii),
The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology;
41.,
Retrieved from the Birds of North America Online: la
http//bna.birds.comell.edu/bna/species/075. a
Dunk, J. R. 1995. White-tailed kite (Elanus leucurus). In The uds of North'America, No. 178
(A. Poole and F. Gill, eds.). The Academy of Nat" Sciences, Philadelphia, and The
American Ornithologists' Union, Washingtg1_4 C. a
Feaver, P.E. 1971. Breeding Pool Selection and Larval Mortahty=of Three California
Amphibians: Amb stoma ti num californiense Gran` ?i3 .la re ills Baird and Girard
P Y Y� Y g
and Scaphiopus hammondi hamm .AA. ard. Master's emesis, Department of Biology,
Fresno State College, Fresno, Califo", ia�0d,,, app
'fir.
Federal Interagency Committee for Wetland Dehnea�-on. 1989 j 6deral manual for identifying
and delineating Jurisdictional wetlands Lt' S. Army Corps of Engineers, U. S.
Environmental Pjotection°Agecy
n, U. S. Fish and Wildlife Service, and U.S.D.A. Soil
Conservation Service, Washington, D.C. Coperative Technical Publication.
»u ,
Hickman, James C ;editor 199" e Jepson Manual. University of California Press, Berkeley,
Holland, Robert F. 1986.
of the terrestrial natural communities of
-nt of Fish and Game Nongame Heritage Program.
, 1986.
Kunz, T. H., and R. A.1IvI'artin. 1982. Plecotus townsendii. American Society of
Mammalogists, Mammalian Species, 175:1-6.
Leidy, R.A., G.S. Becker, and B.N. Harvey. 2005. Historic Distribution and Current Status for
Steelhead/Rainbow Trout (Oncorhynchus mykiss) in Streams of the San Francisco Estuary,
California. Center for Ecosystem Management and Restoration, Oakland, California.
hqp://www.cemar.org/pdf/santaclara.pdf
Jameson, Jr., E., H. Peeters. 2004. Mammals of California. Berkeley: University of California
Press.
1072 Geneva Avenue, San Francisco CA 94112 - Ph: 415-404-6757 - Cell: 650-269-3894 - Fax: 415-404-6097
E-rnail: CRecology@gmail.com - www.CRecology.com
10
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Patlnvay Improvements — January 2011
Page 35
Jennings, M.R. and Hayes, M.P. 1994. Amphibian and Reptile Species of Special Concern in
California. Prepared for the Calif. Dept. of Fish and Game Inland Fisheries Div. Rancho
Cordova, Calif. November 1. 255 pp.
Jennings, M.R. and Hayes, M. P. 1985. Pre -1900 Overharvest of California red -legged frogs
(Rana aurora draytonii): The inducement for bullfrog (Rana catesbeiana)
introduction. Herpetologica 41(1):94-103.
Macwhirter, R. B. and K. L. Bildstein. 1996. Northern Hamer (Circus
North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of.
the Birds of North America Online: httn://bna.birds.comell.ed
Moyle, P.B. 2002. Inland fishes of California. University of
pp- 'All
National Oceanic and Atmospheric Administration.( OAA)
Species: Final Listing Determinations for 16 ES_Usr c
Protective Regulations for Threatened Salmonid ESI
123 / Tuesday, June 28, 2005. V
NOAA 2005b. Endangered and Threatened Specie:
Evolutionarily Significant Units of Pacific
Federal Register 70 (L70): 52488 - 52627
http://www.nwr:rioaikiiblications/FR`
National Resources Conservation Service (MRCS),
Regional
). The Birds of
ogy; Retrieved from
acies/210.
Berkeley, CA. 502
A Salmon, and'Fina14(d)
Register / Vol. 70, No.
nhcal Habitat for Seven
head in California; Final Rule.
Office of Protected Resources.
apartment of Agriculture. Web Soil
December, 20010.
Board. 1995. Basin Plan.
Santa Clara VOley,,Urban Runoff Pollution Prevention Program, 2008. Watershed Monitoring and
Assessment Pzogram Strearn Survey and Impact Assessment -- Matadero Creek.
September 008;'Prepared by EOA, Inc.
Santa Clara Valley Water District (SCVWD), 2006. Guidelines and Standards for Land Use Near
Streams. Santa Clara Valley Water Resources Protection Collaborative. Revised July.
http://www.valleywater.ori/media/pdf/Creekwise/Guidelines chapters/Title%20page%20a
nd%20aknowledgements.pdf.
Sawyer, John, and Todd Keeler -Wolf. 1995. A Manual of California Vegetation. California
Native Plant Society, Sacramento.
1072 Geneva Avenue, San Francisco CA 94112 • Pb: 415-404-6757 • Cell: 650-269-3894 • Fax: 415-404-6097
E-mail- CRecologyagmail.com - www.CRecology.com
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
Page 36 .
Sawyer, J.O., T. Keeler -Wolf, and J.M. Evans. 2009. A Manual of California Vegetation (2nd
edition). California Native Plant Society, Sacramento. 1300 pp.
Shaffer, H.B., R.N. Fisher, S.E. Stanley. 1993. Status Report: The California Tiger Salamander
(Ambystoma californiense). A Final report to the California Department of Fish and Game,
Inland Fisheries Division. Rancho Cordova, California. Under contracts FG9422 and FG
1383.
SCBWMI.2001. Watershed management plan, Volume One unabridged, 41 watershed characteristics
report, Chapter 7: natural setting (amended December 2003). Saifa`Clara Basin Watershed
Management Initiative.
Shaffer, H. B., and R. Fisher. 1991. Final Report to the California Department of Fish and Game:
California tiger salamander surveys, 1990--Contra6't (FG9422). Calif&- "a Department of
:.
Fish and Game, Inland Fisheries Division, Ro Cordova, CA. V11,
Shuford, W.D. and T.G. Gardali. Eds. 2008. Califorma`80,1.
Assessment of Species, Subspecies, and Distinct Popuia
Conservation Concern in California. Studies of Western
Ornithologists and California Departmet
5
Stebbins, R.C. 2003. Field Guide to Western I
Field Guide Series. ,.ou ,. ton Mifflin
Storer, T.I. 1925. A Synopsis of theAmphibia
in Zoology 27 1 X42 ;
U.S. Fish and`Wildltice (LTS)~WS) 20
«;Occur in or may be Affected bu.Proie
. 2010b. E
Wildlife an
Frog; Final
March 17.
and Game:
,N
s of Special Concern. A Ranked
of Birds of Immediate
3.No. 1. Western Field
4�SOw1?P,"'
ians. Third Edition. Peterson
of California. University of California Publications
:. Federal Endangered and Threatened Species that
in Santa Clara County. Threatened and
printout. Database access December 29, at
and Threatened Wildlife and Plants; Endangered and Threatened
Zevised Designation of Critical Habitat for California Red -Legged
CFR Part 17). Federal Register: Vol. 75, No. 51: 12816-12959.
. 2005. Federal Register: Endangered and Threatened Wildlife and Plants; Designation of
Critical Habitat for the California Tiger Salamander (Ambystoma californiense), Central
Population; Final Rule; 50 CFR. Part 17. Vol. 70. No. 162: pp. 49380 — 49458.
.2002. Recovery plan for the California red -legged frog (Rana aurora draytonii). U.S. Fish
and Wildlife Service, Portland OR.
1072 Geneva Avenue, San Francisco CA 94.112 • Ph: 415-404-6757 - Cell: 650-269-3894 - Fax: 415-404-6097
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
Page 37
1999b. Programmatic Consultation for Section 404 Nationwide Permit Program that
may Affect California Red -legged Frogs, January 26. Document No. 1-1-99-F-52.
Yosef, Reuven. 1996. Loggerhead Shrike (Lanius ludovicianus), The Birds of North America
Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North
America Online: http://bna-birds.comell.edu/bna/species/231. .
Zeiner, David C., William F. Laudenslayer, Jr., Kenneth E. Mayer, and Marshall White. 1990.
California's wildlife, Volume I: amphibians and reptiles; Volume II: birds; and Volume III:
mammals. California Statewide Habitat Relationships Program,; -!2 G, The Resources
Agency, Sacramento, CA.
Personal Communications
Dr. Alan Launer, Campus Biologist, Stanford Umversily. Telephone and email
January, 2011.'.
1072 Geneva Avenue, San Francisco CA 94112 • Ph: 415-404-6757 • Cell: 650-269-3894 < Fax: 415-404-6097
E-mail: CRecology@gmail.com • www.CRecology.com
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd Pathway Improvements— January 2011.
Page A-3
Figure A-6. View of location where pedestrian bridge would be installed across Matadero Creek.
Photo date: 11/29/2010.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Patlnvay Improvenients -- January 2011
Page B-1
Appendix B. Special Status Plant and Animal Species in the Vicinity of the Project
Site
In evaluating on-site habitat suitability for special status plant and wildlife species within the study
area, relevant literature, knowledge of regional biota, and observations made during the field
investigations were applied as analysis criteria. Criteria determinations for occurrence potential of
special status species are divided into the five categories described below. These determination
categories appear in the following table, which provides a summary of the status, habitat affinities,
flowering phenology, habitat suitability and local distribution, and potential for occurrence for each
of the target special status species. It should be noted that local distribution references refer to the
CNDDB Element Occurrence Index (EONDX) number (CDFG 2009). The EONDX is an integer
primary key (unique for each record) used within the CNDDB for GIS relational databases.
Although the EONDX is assigned sequentially, gaps may appear as recordsza.re merged or
updated. Factors influencing which determination criteria are applied totarget species is detailed
below.
• None denotes a complete lack of habitat suitability, local°,range restrictions, and/or regional
extirpations.
• Not Expected denotes situations where suitable�habitat or key habitat elements may be
present but may be of poor quality or isolated from thginearest extant occurrences: ,incompatible
habitat suitability refers to elevation, geology, soil chdoistry and type, vegetation communities,
microhabitats, and degraded/significantly altered habitats These`,factors create unsuitable
ecological conditions for the consideration of even a low occurrence potential within the study area.
• Absent indicates specified taxa not observed during field investigations and were
consequently ruled out. This category also�refers to diagnostic vegetative material of shrubby
perennial species not observed on site. This,category refers only t "plant species.
• Possible indicates the presence of suitablWiha stat or key habrt I elements that potentially
support a specific species or taxa.r, ;
• Present indicates the target species was either obsrved`directly or its presence was
confirmed by diagnostic sign {r ex�tracks, scat, burrfts, carcasses, castings, prey remains, etc.)
during field investigations/' 3
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a
pec�esrNme�
Status
Fiabrtat p�
r- .
Occu Onsite
WILDLIFE, e
INVERTEBRATES='
Bay checkerspot r
Fed FT - A
The bay checkerspot butterfly is a medium-sized butterfly in
None
butterflyCA.
none
the N m'r'tialidae brush -footed butterflies family. The
Y p, C ) Y
No suitable habitat
Euphydryas edrfha;£
,
'species i's, restricted to grasslands with serpentine soils in
present within the
bayensis
the San:Francisco Bay area. Plantago erecta is the primary
trail alignment.
i >
;host plant, Casfilleja densiflorus and C. purpurescens are
�'°'
secondary host plants. Nectar plants include Layia
`* '
;platyglossa and Lasthenia califomica.
ti
The species is only known from the San Francisco peninsula
7
and the south San Francisco Bay area. Declining
y"
populations have resulted from loss of grassland habitat to
'✓
development and loss of host and nectar plants within
grasslands from invasive weeds. The bay checkerspot was
last observed at Jasper Ridge Biological Preserve in 1998.
Ricksecker's water
Fed: none
Inhabits slow moving freshwater streams, side channel and
Not Expected
scavenger beetle
CA: none
backwater pools, ponds, marshes and lakes in Sonoma,
Very little known
Hydrochara rickseckeri
SA
Marin, Alameda, Contra Costa and San Mateo counties.
about species. Has
Little data is available regarding this species' natural history.
not been observed
since 1950's.
Nearest record is
located in San
Mateo.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd Pathway Improvements— January 2011
Page B-2
Species Name
Status
�:�,x�
Habitat
Pt�tentral zoo
_ n,
Occur, OnsrtW
San Francisco
Fed: none
Inhabits small, marshy ponds and ditches with emergent and
None
forktail damselfly
CA: none
floating aquatic vegetation. Has been recorded in San Mateo
No suitable habitat
Ischnura gemina
SA
and San Francisco Counties.
on site, and species
has not been
recorded in Santa
Clara County
Monarch butterfly
Fed: none
Monarch butterflies require wind protected tree groves along
Not Expected
Danaus plexippus
CA: none
the California coast for nectaring, migratory roosting, and
Monarch roosting
SA
wintering sites. Roosting sites are also located in isolated
sites are typically
locations bordering San Francisco Bay. Blue gum
located within
Eucalyptus (Eucalyptus globulus) is commonly,used by
mile of the coast, or
monarch butterflies as nectaring and roosting sites:_;
San Francisco Bay,
Monterey pine (Pinus radiata) and Monterey, -,cypress
and the property is
(Cupressus macrocarpa) groves may also provide roosting
several miles inland.
habitat for monarch butterflies. `,a.
Myrtle's silverspot
Fed: FE
The Myrtle's silverspot butterfly is a hiadium szed butterfly
None
butterfly
CA: none
that is found in coastal dune or coasfal.prairie habitat
Species once
Speyeria zerene
Females lay their eggs in the�debnsand dried steffis.6f their
occurred in San
myrtleae
larval host plant blue violet£(Viola adunca). Adults fee' d`on
Mateo County, but
nectar from flowers ineludkr hairy gumweed (Grindelia n
fiow is believed to
,.
hirsutula), coastal sand verbena (Abronia latifolia), mints ands
„
be restricted to
thistles.
coastal areas of
�,-✓
Populations were formerly found +n tlunes and bluffs from
Marin County. No
San Mateo County north to the mouth..of the Russian River
suitable habitat
in Sonoma County. The adult flight season ranges from. late
present in project
June to early�'September.
area:
Unsilvered fritillary
Fed: none
The Unsilvered frrtillary�butterfly is a mediuiiitsized butterfly
Not Expected
Speyeda adiaste
CA: none
in the brush -footed butterflyfamily Nympfialidae, with a
No suitable habitat
adiaste
SA
Wingspan of approximately 2 inch`e�s The spot pattern on the
is present within the
,.
ven#ral hind wings is-Unsilvered and�almost obsolete. The
project area.
Unsilvered fritillary butterfly occurs9n grasslands, chaparral
�b
and oak woodland, where it's host plant (Viola sp.) are
'
present The species rie`ctars on thistles and California
3buckeye {Aesculus cahforlica). This species is uncommon
and +s thought #o be declining in numbers.
Steelhead �
Fed: FT CH
Steel '-d are anadromous fish that migrate from the ocean
Not Expected
t
CA: none
into fresh wafer streams to spawn (Moyle 2002). Rainbow
Species has not
Oncorhynchus myk�ss
AFS: Th
out refers'to the resident form of the species that inhabits
been documented in
iddeus >>
lakes or`�streams and does not migrate to the ocean.
9
the upper watershed
pP
central California
y
"`=fir,.
ttieelhead build redds (i.e., spawning beds) at the head of
of Matadero Creek
coast DPS
?1L, where water is well oxygenated and nearby pools with
for several decades.
deeper water provide safe refuge for juveniles. Optimal
temperatures for growth are 15-18°C. While in freshwater
>:v
streams, steelhead feed on drifting aquatic organisms,
terrestrial insects and bottom dwelling invertebrates (Moyle
2002). Migratory steelhead smolts migrate to the ocean
after spending 1-3 years in their natal freshwater streams.
Adults remain in the ocean for 1-4 years prior to returning to
their natal streams, or occasionally to neighboring streams,
to spawn. Unlike salmon, steelhead often return to spawn
more than once.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Patlnvay Improvements -- .Ianual y 2011
Page B-3
-Species Name
States f
Habitat
to
.,.
��
Occur=Onsite
AM. PHIBIANS `AND,ftEPTILES ' Y•; . ...:
_ . .
California red -legged
Fed: FT, CH
A medium-sized frog that inhabits lowlands & foothills in or
Possible
frog
CA: SSC
near permanent sources of deep water with dense, shrubby
No suitable breeding
Rana aurora draytonii
or emergent riparian vegetation up to 1,500 meters in
habitat on the trail
elevation (Stebbins 2003). Range extends from Redding to
alignment, however
Baja California, Mexico with hybridization occurring with the
the trail alignment
California red -legged frog from the Oregon border to Marin
may provide
County. Breeding occurs between November and April in
nonbreeding
standing or slow moving water at least 0.7 meters (2 % feet)
dispersal habitat.
in depth with emergent vegetation, such as cattails (Typha
spp.), tules (Scirpus spp.) or overhanging willows (Salix
spp.) (Hayes and Jennings 1988). Habitat for:
k 1 0
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
Page B-4
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E-mail: CRecology@gmail.com - www.CRecology.coni
oten#iat to
Species Name,
Status
Habits#
Western pond turtle
Fed: none
A moderate sized freshwater turtle that inhabits permanent
Not Expected
Emys marmorata
CA: SSC
or nearly permanent bodies of water and low gradient slow
Species is unlikely
marmorata
USFS:S
moving streams below 6000 feet elevation. Species
to utilize the trail
requires aquatic habitat with a minimum of 2 meters (6.5
alignment area due
feet) of depth for escape cover and suitable basking sites,
to the lack of
and adjacent open upland habitats for nesting sites. Range
suitable aquatic
extends from Washington to the northern Bay Area counties
habitats in adjacent
along the Pacific slope drainages. Two recognized
areas to support this
subspecies include the northwestern pond turtle (E. m.
species.
marmorata) which ranges north of the American River and
the southwestern pond turtle (E. m. pallida) which ranges
from the coastal areas south of San Franciscd Subspecies
interbreed within the gradation zone that defines the''two
subspecies. .Y:=
i131F�DS, F
i
Burrowing owl
Fed: none
Inhabits valley bottoms and foothills ninth low vegetation and
Not Expected
Athene cunicularia
CA: SSC
fossorial mammal activity. Listing includes wintenng�;_:
No suitable breeding
(burrow sites & some
BLM: S
observations with/without a buiro n, San Francisco,;
habitat. Marginally
wintering sites)
Ventura, Sonoma, Mann Napa and Santa Cruz counties �_
ti
suitable wintering
Breeding begins in March`Single-brooded (Baicich & ti
habitat adjacent to
Harrison 2005).' b �� w(>`
the trail alignment.
4
California thrasher
Fed: none
Inhabits chaparral, foothills, valley thickets and suburban
Possible
Toxostoma redivivum
CA: none
areas. Breeds in similar habitats hroughout much of the
Suitable nesting
ABC
coastal CaAbirnia and the western�`Sierra, foothills south of
habitat is present
Redding. Breeds November through July double -brooded
adjacent to trail
(Baicich & Ham0if..2005) `� r
alignment.
Cooper's hawk
Fed: none
Inhabits dense stands ofoak=woodlands, riparian deciduous
Possible
Accipiter cooperii
CA: WL
forests, or other forest habitats often^near water & suburban
Suitable nesting and
(nesting)
Gareas. Hunts in broken woodlands' Walong forest edges.
foraging habitat is
y�'":
r'
Breeding begins in Apol; single -brooded (Baicich & Harrison
present within areas
2005);- h
adjacent to trail
alignment. Species
\
was observed
foraging in area
during biological
surveys.
s
Northern harner
Fed: none_
;:Northern harrier is a year-round resident of coastal California
Not Expected
Circus cyaneus
CA: WL
and the Central Valley. Inhabits both freshwater and
May forage
rmsNk
altwater marshes and adjacent upland grasslands. Nests
infrequently over
ground in tall grasses or clumps of tall vegetation in
project area
grasslands and meadows (Macwhirter and Bildstein 1996).
z
x`Breeds from Late March through September; single -brooded
F
(Baicich & Harrison 2005). Northern harriers forage on the
wing in low flight in marshes, prairies, heavily grazed
grasslands, and harvested fields primarily for voles (Microtus
spp.), but also feeds opportunistically on other small
mammals, reptiles, amphibians and small birds (Macwhirter
and Bildstein 1996).
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i „ i
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pat6nvay Improvements -- Januaiy 2011
Page B-5
Na
Speaes me _
Status
bit
Haat
Poter>itial to ;
`
OccurAnsite
Golden eagle Aquila
Fed: none
A large diurnal raptor that nests on cliffs and in large trees in
Not Expected
chrysaetos
CA: SSC,
open areas. Forages in open terrain including grasslands,
Marginally suitable
(nesting and wintering)
FP, WL,
deserts, savannahs and early successional stages of forest
foraging habitat is
BCC
and shrub habitats. Breeding begins in February to late May;
present for this
single -brooded (Baicich & Harrison 2005).
species. There are
no known nesting
sites for golden
eagle within the
region. May
occasionally forage
=_a
over open habitats
and occur as a
flyover due to large
R;:
habitat range.
Lawrence's goldfinch
Fed: none
Inhabits and oak/pine woodlands, footF. ills and chaparral
Not Expected
Carduelis lawrencei
CA: none
from northern California west of the Sierra Nevada south to
Marginally suitable
(nesting)
ABC, BCC
Baja California, Mexico. Breeding,begins in Mar`dh double-
habitat in project
brooded (Baicich & Harrison 2005) �, '
area. This species is
s=
rarely detected in
,.
Santa Clara County,
z
y and typically does
not breed in coastal
habitats.
Loggerhead shrike
Fed: none
Inhabits a variety of habitats from'open grasslands and
Possible
Lanius ludovicianus
CA: SSC
scrub to woodlands and riparian areas')Species typically
Suitable foraging
(nesting)
BCC
uses fenceposts, shr..ubs and small treesfor�perching while
and marginal
foraging in open ;habitats,,Year-round residenC6f California.
nesting habitat
Breeding begms�in Fe(iru2ry double to triple°brooded
present within oak
(Baicich & Harrison 2005�> � A
k
savannah in ro ect
project
area.
Long-eared owl
Fed none�
�tr%i abits riparian and 66 oak woodlands near meadows and
Not Expected
Asio otus
CA SSC,'.•
forested habitats. Occurs in dense conifer stands at higher
No suitable habitat
(nesting)
„
elevations. An uncommon species in the San Francisco Bay
present for this
Area4gBreeds from Marcli o:July.
species within the
��`
project area.
Merlin
Fed none
Wnters<th'roughout California, breeds in northern states,
Not Expected
Falco columbarius
CA WL,,
`Canada and Alaska Wintering habitat included open forests,
Marginal winter
(wintering) s ''
gr W'6nds, agricultural fields, mud flats and urban areas.
foraging habitat in
J.-single-bf
FeegOimarily on small birds. Breeding begins in May; •
the project area.
6ded Baicich & Harrison 2005).
Nuttall's woodpecket,
Fed: none
Inhabits oak woodland and mixed riparian woodlands.
Present
Picoides nuttallii
CA: none
Forage along bark of trees for insects; also feeds on acorns.
Suitable nesting
(nesting)
ABC
Cavity nester. Breeding begins in March; single -brooded
habitat is present
(Baicich &Harrison 2005).
within oak savannah
fi
and ornamental
zs.F_w
trees within project
area.
Oak titmouse
Fed: none
Primarily an oak obligate species, the oak titmouse inhabits
Present
Baeolophus inornatus
CA: none
oak woodlands, oak savannahs, pinyon and juniper
Suitable nesting and
(nesting)
ABC
woodlands and occasionally suburban areas with oaks.
foraging habitat is
Year-round resident throughout much of California. Breeding
present in the
begins in March; single -brooded Baicich & Harrison 2005.
project area.
Bank swallow
Fed: noneNone
Colonial nester; nests primarily in riparian and other lowland
Riparia riparia
CA: FT
habitats west of the desert. Requires vertical banks/cliffs
No suitable open
(nesting)
with fine-textured/sandy soils near streams, rivers, lakes,
bank habitat for this
and/or ocean to dig nesting hole.
species within the
trail alignment.
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4 (u )
BRA for Town of Los Altos Hills C-2 Trail /Arasb•adero Rd. Pathway Improvements — Janua7y 2011
Page B-6
Specres Name
Status
z
Habitat
Potent�al!to
4
..
n�
Occue Onsite
Black -crowned night
Fed: none
Colonial nester, usually in trees, occasionally in tule patches.
Not Expected
heron
CA: none
Rookery sites located adjacent to foraging areas: lake
No suitable nesting
(Nycticorax nycticorax)
BLM: S
margins, mud -bordered bays, marshy spots.
habitat for this
(rookery site)
species within the
trail alignment.
Sharp -shinned hawk
Fed: none
Inhabits north -facing slopes in conifers, including ponderosa
Not Expected
A ccipiter striatus
CA: WL
pine, black oak, & Jeffrey pines, preferably in riparian areas. _
Suitable foraging
(nesting)
Forages primarily for small birds along woodland edges &
habitat is present in
openings, hedgerows, brushy pastures, & shorelines.
project area.
Breeding begins in April; single -brooded (Baicich & Harrison
Species is not
2005).
expected to nest in
project area.
White-tailed kite
Fed: none
Inhabits grasslands, agriculture fields "-soak woodlands,
Possible
Elanus leucurus
CA: FP
savannah and riparian habitats in rura and u(lian areas.
Suitable foraging
(nesting)
Other:
Feeds primarily on California voles. Forages over grassland
habitat is present
and nests in shrubs and trees Yeaf.=.round resident ofd ,
within the open
Central and Coastal Califon a. Breeding begins in February;
habitats in the
sometimes double -brooded (Baicich & Harrison 2005). ,
area.
_project
y
Great blue heron
Fed: none
Colonial nester in tall trees dif ides" -and equestered spots
None
Ardea herodias
CA: noneon
marshes. Rookery sites in close=6.��proximity to foraging -
No suitable habitat
(rookery site)
Other:
areas: marshes, lake margins, ticieilats, rivers and streams,
for rookeries. May
CDF: Swet
meadows -: ��
forage within project
area.
Snowy egret
Fed: none
Colonial nester''with ne t4§itetisituated m protected beds of
None
Egretta thula
CA: none
dense tules. Rookery sites situated close to foram areas:
No suitable habitat
(rookery site)
SA
marshes, tidal -flats streams, wet meadows, and borders of
for rookeries. May
lalces��, "
forage within project
area.
Saltmarsh common
Fed:' on �! �,
Resident of the San Francisco bay region, in fresh and salt
Not Expected
yellowthroat
CA SSC
waternarshes Requires hick, continuous cover down to
Suitable marsh
Geothlypis trichasBCC
water surfacefor foraging; tall grasses, tule patches, willows
habitat not present
sinuosa,;
for nesting.
project ect area.
P
,,k
Northern harper
Fed: none
Inhabits coastal salt and fresh -water marsh. Nests and
Not Expected.
Circus cyanevs f
CA: SSC
:forages in grasslands, from salt grass in desert sink to
Species utilizes
nountairabogs/swamps. Nests on ground in shrubby
coastal grasslands
,.
x-
K
--vegetation, usually at marsh edge; nest built of a large
typically near water.
n.,
F mound of sticks in wet areas.
Ma forage within
y g
project area
infrequently.
y'
Yellow -breasted chat
Fed: n ,one
A large, secretive wood warbler that inhabits riparian
Not Expected
Icteria virens
CA: SSC
thickets, pond margins, marshes, hedgerows, old pastures
Dense thickets not
(nesting)
and edge habitats in forests especially regenerating burned
present in Matadero
and logged areas (Eckerle and Thompson 2001, Baicich &
Creek in project
Harrison 2005). Distributed throughout northern California
area.
and the Central Valley. Nests in dense shrubs up to eight
feet in height; breeding begins in early April; double -brooded
(Baicich & Harrison 2005).
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i �1 _s
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- Janua7y 2011
Page B-7
Species Name
Status
Potential to:
HabitatIR,
Occur Onsite
MAIAMALS
. ...., , .ti ; �,...,.......a� .,..,..: ,
San Francisco
Fed: none
Inhabits chaparral, coastal scrub, oak woodland, and
Present
dusky -footed
CA: SSC
riparian woodland in the San Francisco Bay Area. They
Species was
woodrat
exhibit high site fidelity and may live in the same nest
detected on site
Neotoma fuscipes
community for generations. Nest structures are key indicator
within the oak
annectens
of their presence and are easily identified by their large,
savannah and within
conical appearance. Species is typically not associated with
ornamental
urban areas due to lack of suitable native woodland plants
vegetation.
used for foraging, and increased predation pressure from
feral and domestic cats. Typically does not nest in human
structures, unless suitable foraging habitat is adjacent.
American badger
Fed: none
A large mustelid that inhabits open areas With friable soils
Not Expected
Taxidea taxus
CA: SSC
within woodland, grassland, savannah antl desert habitats. A
Marginal habitat
fossorial mammal that preys predominately of ground
present in
squirrels (Ammospermophilus and Spermophrlusspp.) and
grasslands, but
pocket gophers (Thomomys spp'). Mating occurs rn,late
limited available
summer, young are born in Marchand April. �?
open habitat within
�'
the trail alignment.
t,
Rxsti Y�
Species rarely
�y ` ,
�'observed in Santa
Clara County.
� t f
Big free -tail bat
Fed: none
Big free -tail bat ranges from mos#of=South America
Not Expected
(Nyctinomops
CA: SSC
northward to include Mexico, Arizona New Mexico, southern
Rare migrant in
macrotis)
WBWG - MH
and western Texas southern California and southeastern
Santa Clara County.
'Q
Nevada, souther, aid north to centra) Colorado. The
species is migratory, and 6&known elevational range is
from near sea level to about 9AO. ft (2,600 meters). Big
free -tail bats appearto.m6inly irihabttugged, rocky habitats
irk gr Iandscapes The�species has been found in a variety
of plant associations�ancluding desert shrub, woodlands,
and'ever reen forestskq
Fringed myotis
Fed' nonex 5
Exhibits a strong roosting,-p„reference for large trees and
Possible
Myotis thysanodes
CA none
,snags butrwill use buildings, caves, rock crevices, etc. if
Potential roosting
WBWG H
necessary Inhabits artvanety of woodland, scrub and
and foraging habitat
Y
mM
grassland habitais up`to 2,850 meters throughout California
along Matadero
3�,
excep#,for Central Valley and southern deserts. Forages
Creek.
distances and is active during winter months. Highly
��, ,, 9
�9reat
,sensitive'ao human disturbance.
Western red batV,
Fed: noneThe
west&'m red bat is primarily riparian obligate species
Possible
�
Lasiurus blossevrllu
CA: SSC
with a widespread distribution extending from British
Species is a fall
.WBWG-H
I Gblumbia to Argentina (Bolster 2005). They are ubiquitous
migrant. Suitable
USFS: S
° t)iroughout most of California except the northern Great
roosting habitat
Basin region. The red bat is easily distinguished by its
present within
f -v
distinctive reddish coloration. Roosting typically occurs
Matadero Creek.
individually in dense clumps of tree foliage in riparian areas,
r'
especially willows, cottonwoods and sycamores, and within
orchards and suburban areas in trees and shrubs. Roosts
are often hidden from view and only access from below
(Bolster 2005). Red bats are primarily moth specialists, but
individuals will forage for a variety of other insects.
Individuals have been observed foraging around street
lamps and flood lights in suburban areas (Bolster 2005). The
western red bat migrates long distances, but has been
reported to overwinter in the Bay Area with interspersed
winter foraging bouts on warm days Bolster 2005).
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway lnzproven:ents -- January 2011
Page B-8
Specrses Name`'
Status...
T
4 ` Habria#,"
P ten a1�#o
s,,...-.
_¢ .. _..... F.
Occur Qnsrte
Long-eared bat
Fed: none
The long-eared myotis bat ranges across western North
Possible
Myotis evotis
CA: none
America from Canada to Baja California, Mexico and
Potentially suitable
BLM: S
eastward to the western Great Plains (Bogan et al. 2005).
roosting and
WBWG-M
Long-eared myotis bats primarily inhabit coniferous and to a
foraging habitat in
lesser extent semi -arid shrublands, sage, chaparral, and
project area
agricultural areas (Bogan et al. 2005). Roosts are located in
tree cavities and under exfoliating bark in dead trees;
however, pregnant females may use rock crevices, tree
stumps and fallen logs. Young are born in June; females
form small nursery colonies (Jameson and Peeters 2004):
They forage for large prey such as beetles and. moths by
gleaning from foliage, rocks and other substrate »While
hovering (Bogan et al. 2005.'
Hoary bat
Fed: none
Ubiquitous throughout California. A solitarar foliage rooster
Possible
Lasiurus cinereus
CA: none.
that prefers evergreens, but will use deciduous #rees in
Unlikely to breed
WBWG-M
forested habitats, articular) in ed e�habitat: Bolster 2005.
particularly 9, ( )
within project area.
P J
May forage in small to large groups. Feeds primanik Qn
Potentially suitable
moths, but will eat a variety ofrother.insects. Migrates great
roosting and
distances.
foraging habitat is
resent.
Yuma myotis
Fed: none
The Yuma myotis bat-hihd kthroughd t,westem North sy
Possible
Myotis yumanensis
CA: none
America from British Colum-tira ,Canadi� t6 Mexico, and is
Potentially suitable
BLM:S
ubiquitous throughout CaliforniaTypical habitat includes V
breeding habitat,
WBWG-LM
riparian corridors and edge habit 6hjorested canyons, but
foraging and
also inhabit acid shrublands, deserts and forests (Bogan et
roosting habitat
al. 2005). Th6kare colonial roosters'and are typically found
within Matadero
in manmade structufds such as bridges br building, but will
Creek
also use caves, mines and old„cliff swallo"8sts (Jameson
and Peeters 2004). They alsa'roost in a variety of habitats
and forage above he water in npanar%,'corridors and along
T -thy _forest edge Yuma niyotis bats form maternity colonies of
.zx.
several thousand andgive birth from April through July
dep`eti3ding on latitude'(Bogan et al. 2005).
Long-legged myotis
Fed: none
Long legged myotis bats'inhabit brushy woodlands and
Possible
Myotis volans
,,”
CA: none '-
`conrferous{forests up to2,800 meters throughout California
Potentially suitable
,WB]AIG
except the Cent�alValley and deserts. They roost in a
roosting and
valnety,of habitats including exfoliating bark, tree hollows,
foraging habitat in
cavesgrotten stumps, snags, cliff crevices and bridges. They
the project area.
are foliage gleaners that require nearby water.
° ,.
Pallid batFed:
none
Inhabits`rocky terrain in open areas in lowlands, foothills and
Possible
Antrozous pallidus
CA: SSC
mountainous areas near water throughout California below
Potential roosting
"13S,FS: S2;000
meters. Roost in caves, rock crevices, mines, hollow
and foraging habitat
WBWG-H
a trees, buildings and bridges in and regions in low numbers
in the project area.
(<200). Active from March -November; migrates in some
areas, but may hibernate locally. Preys on large beetles and
scorpions. This species is typically found in dry grasslands
and oak savannah habitats, and currently can be detected in
the south and east San Francisco Bay area.
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i 9,i a
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
Page B-9
rSpec�es Name
Status
Habi#at',
Potential to
�.
Occu`f Onsite
Townsend's big-
Fed: none
A cave rooster and moth specialist. Inhabits caves and
Not Expected
eared bat
CA: SSC
mines, but may also use bridges, buildings, rock crevices
Marginally suitable
Corynorhinus
USFS: S
and tree hollows in coastal lowlands, cultivated valleys and
habitat present
townsendi
WBWG-H
nearby hills characterized by mixed vegetation throughout
within the project
California below 3,300 meters. Exhibits high site fidelity and
area. The species is
is highly sensitive to disturbance. Forages along edge
a rare rooster on the
habitats near water; may travel long distances during
San Francisco
foraging bouts. It is a moth specialist with over 90% of its
peninsula.
diet composed of lepidopterans. This species has been
detected in the north and east San Francisco Bay area.
Mat PLANTS',
s_ _ . .... _ �..
Alkali milk -vetch
Fed: none
Alkali playa, valley and foothill grassland„vernal pools.
None
Astragalus tener var.
CA: none
Low ground, alkali flats, and flooded lands ih annual
No suitable habitat
tener
CNPS 16.2
grassland or in playas or vernal pools 1'-170m?,Flowers
present..
March —June
Anderson's
Fed: none
Evergreen shrub that occurs in openings and edges of
None
manzanita
CA: none
broadleaved upland forest chaparral; and north coasts
No suitable habitat
Arctostaphylos
CNPS 1B.2
coniferous forest. Flowers°1'rom November—April.
present.
andersonii�r�
-A
,
Arcuate bush mallow
Fed: none
An evergreen shrub that occurs.ultramafic chaparral, 'L'
None
Malacothamnus
CA: none
ravel) alluvium. Flowers from Agnl,— Se
gravelly P P•
No suitable habitat
arcuatus
CNPS 113.2
present.
Bent -flowered
Fed: none
Cismontane`woodland valley and foothil(�grassland. 50-
Not Expected
fiddleneck (Amsinckia
CA: none
500M. Flowe(s,from March —June. g`
Low potential for
lunaris)
CNPS 1B.2
��
occurrence in
,
ruderal grasslands
near project area.
No suitable habitat
along trail
alignment.
Caper -fruited
Fed fibre
Valley and foothill grassland; Alkaline clay. 0-455m. Flowers
Not Expected
tropidocarpum
CA none' -.
March` April. _�
Low potential for
Tropidocarpum
CNPS 1 B 1
u
occurrence in
capparideum
ruderal grasslands
near project area.
No suitable habitat
along trail
alignment.
Choris's popcorn= 4.
,Fed: none
. Annual Herb that occurs in chaparral, coastal scrub, coastal
None
flower
CA: none
.
p[aine, mesic sites. Flowers from March —June.
No suitable habitat
Plagioboth s
ry�
CNPS 113.2
f
present.
chorisianus var.
S._
chorisianus
- Ys
Coastal marsh milk-
Fed: r6fiie`
Coastal dunes, coastal salt marshes.
None
vetch
CA: none”
Mesic sites in dunes or along streams or coastal salt
No suitable habitat
Astragalus
CNPS`1 B.2
marshes. 0-30m. Flowers April — October
present.
pycnostachyus var.
pycnostachyus
Congdon's tarplant
Fed: none
Valley and foothill grassland. Alkaline soils, sometimes
Not Expected
Centromadia panyi
CA: none
described as heavy white clay. 1-230m. Flowers May to
Low potential for
ssp. congdonii
CNPS 16.2
November.
presence within
ruderal grasslands
near project area.
No alkaline soils in
project area.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd Pathway Improvements -- January 2011
Page B-10
•n �
qy
� , �
� � �� R �� , �,�
�,
�P�otent�al to h
SpecresNatne
StactusY
f ,;R Habatat,
OccurOri'stte..,.
Crystal Springs
Fed: none
Annual herb found in grassy slopes in valley/foothill
None
lessingia
CA: none
grasslands or coastal sage scrub on serpentine soil. Flowers
No suitable habitat
Lessingia arachnoidea
CNPS 113.2
from Jul — Oct.
present.
Davidson's bush
Fed: none
Deciduous shrub that occurs in sandy washes in coastal
None
mallow
CA: none
scrub, riparian woodland, or chaparral. Flowers from June —
No suitable habitat
Malacothamnus hallii
CNPS 113.2
Jan.
present.
Dudley's lousewort
Fed: none
Perennial herb that occurs in chaparral, cismontane
None
Pedicularis dudleyi
CA: none
woodland, north coast coniferous forest, and valley and
No suitable habitat
CNPS 113.2
foothill grassland. Flowers from April — June.
resent.
Fountain thistle
Fed: FE
Valley and foothill grassland, chaparral. Serpentine seeps
None
Cirsium fontinale var.
CA: CE
and grassland. 90-180m. Flowers from May — October.
No suitable habitat
fontinale
CNPS 16.1k;`
present.
',
Fragrant fritillary
Fed: FSC
Bulbiferous herb found in moist areas, ften ,oultramafic, open
None
Fritillaria liliacea
CA: none
hills, in valley and foothill grasslands�0F16wers from Feb. —
No suitable habitat
CNPS 113.2
Arill. t�
resent.
Franciscan onion
Fed: none
Bulbiferous herb found in cismontane'Woodland valley and
Not Expected
Allium peninsulare vac
CA: none
foothill grassland. Clay soils often 'on serpentine Dry
Low potential for
franciscanum
CNPS 113.2
q
hillsides. Flowers from May l'June. .;.
occurrence in
m,annual grasslands
rix ,
'near project area.
No suitable habitat
�
along trail
`
alignment.
Franciscan thistle
Fed: none
Perennial herb found in coastal bluff scrub, broadleaved
None
Cirsium andrewsfi
CA: none
m
upland forest;�5iid,coastal scrub, soetimes on,serpentine
No suitable habitat
CNPS 113.2
seeps. Flowers trom,lU(arcb — July. 4,
present.
Hall's bush mallow
Fed: none
Evergreen shruWfoundifitpnmarily ultramafic chaparral.
None
Malacothamnus hallii
CA: none
Flowers from May Sep,_, y'
No suitable habitat
CNPS 1132
present.
Hickman's cinquefoil
Fed: FE -r '
Pereii'nial herb found"in, open pine forests in marshy areas
None
Potentilla hickmanii
CA: SE �,,
and on coastal bluffs, prairies, and grassy meadows.
No suitable habitat
CNPS 113 1 x,,
Flowers from April — Aufl �-
present.
Hoover's button
.Fed: none `'
�Vemal pools,-'Alkalrnezdbpressions, vernal pools, roadside
Not Expected
celery
CA r%one
ditches and other wet places near the coast. 545m. Flowers
Low potential for
Eryngium aristulattff
CNPS 113 ��,
July
irk
occurrence in
var. hooven
k%
w� _
roadside ditch near
,,<
r
t
project area. No
o
suitable habitat
along trail
t;
alignment.
Indian bush mallow
'Fednone
`;Deciduous shrub that occurs in cismontane woodland and
None
Malacothamnus
CA3pone
Kchaparral, on granitic outcrops and sandy bare soils.
No suitable habitat
aboriginum
CNPS 113 zP "'
Flowers from April — Oct.
present.
Kings Mountain
Fed: none
Broadleaved upland forest, chaparral, north coast coniferous
None
manzanita
CA: none
forest. Granitic or sandstone outcrops. 305-730m. Flowers
No suitable habitat
Arctostaphylos
CNPS 113.2
from January — April.
present.
regismontana
Marin western flax
Fed: FT
Chaparral, valley and foothill grassland. In serpentine
None
Hesperolinon
CA: CT
barrens and in serpentine grassland and chaparral. 30-
No suitable habitat
congestum
CNPS 16.1
365m. Flowers from April — July.
present.
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BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvements -- January 2011
Page B-11
eCle$ Name
PE'
Stat US'.
i Nab�t
Potenfia! to
.....,. _..,,.
�
_,...H.
�.�,..,.
at
. __-:�
..,...;...
Robust monardella
Fed: none
A rhizomatous herb that occurs in chaparral openings,
None
Monardella villosa ssp.
CA: none
cismontane woodland, and coastal scrub. Flowers from June
No suitable habitat
globosa
CNPS 1 B.2
- July.
present.
Round -leaved filaree
Fed: none
Cismontane woodland, valley and foothill grassland. Clay
Not Expected
California macrophylla
CA: none
soils. 15-1200m. Flowers March - May.
Low potential for
CNPS 1B.1
occurrence in
ruderal grasslands
near project area.
Most recent record
for species from
'.
region is over 100
years old (CNDDB
6;,
M 2
2010).
Saline clover
Fed: none
Marshes and swamps, valley and foothill grassland, vernal
None
Trifolium
CA: none
pools. Mesic, alkaline sites 0-300mFlowers "M,April to
No suitable habitat
depauperatum var.
CNPS 1 B.2
June.,:-
present.
hydrophilum
`,�=a
San Francisco Bay
Fed: none
Coastal bluff scrub coastal clunes coastal prairie, coastal
None
spineflower
CA: none
scrub. Closely related to C pwngens Sandy soil on terraces "
No suitable habitat
Chorizanthe cuspidata
CNPS 1 B.2
and slopes. 5-550m. Flowers Aptil August
present.
var. cuspidata
4 a
San Francisco
Fed: none
Perennial herb that,_occurs in coastal scrub, valley and
None
campion
CA: none
foothill grassland„coastal bluff scrub chaparral%coastal
No suitable habitat
Silene verecunda ssp.
CNPS 16.2
prairie. Often oti mudstone or shale. Flowers March -
present.
verecunda
=, `'1''
August ':�.
San Francisco
Fed: none
Annual herb that occurs in moisf shady, woodland,
Possible
collinsia
CA none ,A�
x^a-gsociatecl with Caldornia buckeye honeysuckle, ferns,
Potential habitat
Collinsia multicolor
CNPS 1 B 2
coast live oak, poison oak. Flowers'from March - May.
present within shady
banks of Matadero
Creek, however not
expected within trail
b
alignment.
a
ax ,
Ec k
San Francisco owl. s";;�
"Fed noneb
Coastal prairie, valFey and foothill grassland. On serpentine
Not Expected
clover
CA none'= ;
and`rionserpentine substrate (such as at Pt. Reyes). 10-
Low potential for
Triphysaria tloribunda
CNPS 1 B
160m Flowers April - June.
occurrence in
ruderal grasslands
v.
near project area.
�1
No suitable habitat
<b
along trail
YF
alignment.
San Joaquin
Fed none
° Chenopod scrub, alkali meadow, valley and foothill
None
spearscale
CA: none°='s
grassland. In seasonal alkali wetlands or alkali sink scrub
No suitable habitat
Atriplex joaquiniana
CNPS 16:2
with Distichlis spicata, Frankenia, etc. 1-250m. Flowers from
present.
April - October.
San Mateo thorn -mint
Fed: FE
Annual herb that occurs in serpentinite vertisol clays; in
None
Acanthomintha duttonY
CA: CE
relatively open areas. Flowers from April - June.
No suitable habitat
CNPS 113.1
present.
San Mateo woolly
Fed: FE
Cismontane woodland. Often on roadcuts; found on and off
None
sunflower
CA: CE
of serpentine. 45-150m. Flowers from May to June.
No suitable habitat
Eriophyllum latilobum
CNPS 113.1
present.
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4 *° 0
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd Pathway Improvements -- January 2011
Page B-12
Nairne
5tat�us
Habitat
#�citehitlid. toE
{7�Species
'ESM
O.,nsitie
..4s.
r
Western leatherwood
Fed: None
Deciduous shrub that occurs on mesic sites in broadleaved
Possible
Dirca occidentalis
CA: none
upland forest, closed -cone coniferous forest, chaparral,
Potential habitat
CNPS 16.2
cismontane woodland, North Coast coniferous forest,
present within
riparian scrub, and riparian woodland. Flowers from January
Matadero Creek,
— April.
however species
was not observed
during field surveys.
White -flowered rein
Fed: none
Perennial herb that occurs in broadleafed upland forest,
None
orchid
CA: none
lower montane coniferous forest, North Coast coniferous
No suitable habitat
Piperia candida
CNPS 113.2
forest, sometimes on serpentine. Flowers fromTMay —Sep.
_.::
present.
:RARE;PLANTr,GOMMUNITIE$s'.;>..
Fed: none
Central Coast Riparian Scrub (Salix lucid a ssp. lasiandra
Present
CA: G3S3/
Alliance)
Central Coast
G4S3?
�, „a
Riparian Scrub is
=apresent
along
e;V
Matadero adjacent
to the trail
alignment.
I-V,,a
' Explanation of State and Federal Listing Codes s "
s
Federal listing codes: Cali foraiia hstin cg tides:
FE Federally listed as Endangered SE IState listed as Endangered
FT Federally listed as Threatened ST hate listed as Threatened
FPE Federally proposed for listing as Endangered it RV
SCE Stale candidate for listing as Endangered
FPT Federally proposed for listing as Threatened } SCT Sta£e candidate for listing as Threatened
FPD Federally proposed for delisting rs$CD State candidate for delisting
FC Federal candidate species (former Category I candidates). SSC r California Species of Special Concern
SC Species of Concern (NMF$ regulated species only) f FP Fully Protected
CH Critical Habitat (Proposed or Fina])`s designated Watch List
SSC Species of Special I,oncem desrgniied by the Marine Mammal Commission
FSC Federal Species f Concern No longer maintained by tIS,FWS Sacramento Regional Office
SLC Species ofloc
local concdrn nr conservhfron importance — Nokl'oner maintained by USFWS
ABC Thdtarencan Bird conservancy maintains a Green List of all the highest priority birds for conservation in the continental
Unified States and Canada. Based Partnersoff the species assessments prepared by Partners in Flight (PIF) and has been expanded
to include shorebrrds``waterbirds andwaterfowj.
AFS �',, American Fisheries Soerey identifies marine; estuarine and diadromous fish species that are at risk of extinction in North
America. The AFS has de rgnated the following four classifications in order of conservation importance E —Endangered,
T u Threatened, V — Vulnerable, and CSD —Conservation Dependent.
Audubon AudubonWatchlist: GRED species in this category are declining rapidly, have very small populations or limited ranges
and face major conservation ,t eats. These typically are species of global conservation concern. YELLOW: this category
includes those species that are also declining but at a slower rate than those in the red category. These typically are species
of national conseryatron.coicem. GREEN: species in this category are not declining, have unknown trends, or have very
large population saes and are not included on the Watchlist.
BCC U.S. Fish and Wildlfe'Service Birds of Conservation Concern. List of migratory and nonmigratory bird species (beyond
those already designated as federally threatened or endangered) that represent the Service's highest conservation priorities.
BLM Bureau of Land Management. Species designated as "Sensitive Species" are treated with the same level of protection that
is given to federal candidate species.
CNPS California Native Plant Society. CNPS 113 = California Native Plant Society: rare or endangered in CA or elsewhere. 0.1:
Seriously endangered in California; 0.2: Fairly endangered in California, CNPS 2 = California Native Plant Society: rare
or endangered in CA but more common elsewhere., CNPS 3 = California Native Plant Society: more information is
needed to determine degree of sensitivity, CNPS 4 = California Native Plant Society: plant of limited distribution.
CDFGC California Department of Fish and Game Code: §3503 prohibits the taking, possession or needless destruction of the nest
or eggs of any bird; §3503.5 prohibits the taking, possession or destruction of any bird in the order Falconifonnes or
Strigiformes (birds -of -prey) or the taking, possession or destruction of the nest or eggs of any such bird; §3511 outlines
protection for fully protected birds; and §3513 prohibits the taking or possession of any migratory non -game bird as
designated in the Migratory Bird Treaty Act.
FS USDA Forest Service designates species as "sensitive" that are not listed or proposed for listing by the federal Endangered
Species Act for which population viability is a concern, as evidenced by significant current or predicted downward trends
1072 Geneva Avenue, San Francisco CA 94112 • Ph: 415-404-6757 • Cell: 650-269-3894 • Fax: 415-404-6097
E-mail: CRecoiogy@gmail.com • www.CRecology.com
dI a
BRA for Town of Los Altos Hills C-2 Trail /Arastradero Rd. Pathway Improvernents -- Januaiy 2011
Page B-13
in population numbers or density, or significant current or predicted downward trends in habitat capability that would
reduce a species' existing distribution.
MBTA Migratory Bird Treaty Act. Species of migratory birds protected by the Migratory Bird Treaty Act (16 U.S.C. 703-711)
and subject to the regulations on migratory birds contained in this subchapter B of title 50 CFR
MNBMC Migratory Nongame Bird of Management Concern: Considered to be of concern in the U.S. due to documented or
apparent population decline, small or restricted population, or dependence on restricted or vulnerable habitat.
SA "Special Animals" is a general term that refers to all of the taxa the CNDDB is interested in tracking, regardless of their
legal or protection status. This list is also referred to as the list of "species at risk" or "special status species". The
Department of Fish and Game considers the taxa on this list to be those of greatest conservation need.
USBC The United States Bird Conservation Watch List. Includes the Partners in Flight (PIF) Watch List, the United States
Shorebird Conservation Plan Watch List and the Waterbird Conservation for the Americas Watch List.
WB WG The Western Bat Working Group. H — High Priority indicates species that are imperiled or are at high risk of imperilment
based on available information on distribution, status, ecology and known threats; M — Medium Priority indicates a lack of
information to assess the species' status; L — Low Priority indicates relatively stable populations based on available data.
The WBWG also uses intermediary designations including MH — Medium -High and LM — Low -Medium priorities.
Xerces Xerces Society for Invertebrate Conservation. Red List identifies endangered, threatened-or.at-risk pollinator species. PE—
Possibly Extinct indicates species only known from historical occurrences; CI-- CAiically Imperiled indicates species at
very high risk of extinction; I — Imperiled indicates species at high risk of exti iet on; V — Vulnerable indicates species at
moderate risk of extinction; DD — Data Deficient indicates lack of informatidti>iosufficiently assess status.
GLOBAL RANKING
The global rank (G -rank) is a reflection of the overall condition of an element thioughout its global Lange_
SPECIES OR NATURAL COMMUNITY LEVEL
GI = Less than 6 viable element occurrences (Eos) OR less than 1 000 individuals OR less than 2,000 acresN, r ,
G2 = 6-20 Eos OR 1,000-3,000 individuals OR 2,000-10,000 acres 4
G3 =21-80 Eos OR 3,000-10,000 individuals OR 10,000-50,000 acres.
G4 = Apparently secure; this rank is clearly lower than G3 but factors exist,oo cause some cohcem; i.e., there is
some threat, or somewhat narrow habitat
G5 = Population or stand demonstrably secure to ineradicable due to being comrrionly Found in the world.
SUBSPECIES LEVEL''
Subspecies receive a T -rank attached to the G -rank. With the subspecies,%Qthe G -rank reflects the condition of the entire species,
whereas the T -rank reflects the global situation ofii the s, b`res or variety.
For example: Chorizanthe robusta var. hartwegii. This planfs ranked 2TI `f)ie G rank rC rs to the whole species range i.e.,
Chorizanthe robusta. The T -rank refers only to the global candition o ;var hariwegii.
STATE RANKINGfn
The state rank (S -rank) is assigned much the Baine way as the globa.1 rank, except state ranks in California often also contain a threat
designation attached to the S -rank 3
S 1=Less than 6 viable Eos dB`iess.than 1,0 iFndividuals OR less th' n;2 000 acres
S 1.1= very threatened
S 1.2 = threatened
S 1.3 = no currenttireats known "
S2 = 6-20 Eos,OR 1;000-3 b00 individuals OR 2,000 10,000 acres
S2 1 = very hreatened
S2 2 threatened
S2 3 no current threats known
S3 21-80xEos.,or 3,000-10,000 individuals OR 101000-50,000 acres
S3.1 = veryijireatened
S3.2 = threatened a
S3.3 = no current threats known d r
S4 = Apparently secure within Cal ifomia; this rank is clearly lower than S3, but factors exist to cause some concern;
,.
i.e. there is some threat or somewhat -narrow habitat.
SS = Demonstrably secure to ineradicable in California. NO THREAT RANK.
Notes:
1. Other considerations used -*hen ranking a species or natural community include the pattern of distribution of the element on the
landscape, fragmentation of the population/stands, and historical extent as compared to its modem range. It is important to
take a bird's eye or aerial view when ranking sensitive elements rather than simply counting Eos.
2. Uncertainty about the rank of an element is expressed in two major ways: By expressing the rank as a range of values: e.g., S2S3
means the rank is somewhere between S2 and S3. By adding a ? to the rank: e.g., S2? This represents more certainty than
S2S3, but less than S2.
3. Other symbols GH All sites are historical; the element has not been seen for at least 20 years, but suitable habitat still exists (SH =
All California sites are historical). GX All sites are extirpated; this element is extinct in the wild (SX = All California sites
are extirpated). GXC Extinct in the wild; exists in cultivation. G1Q The element is very rare, but there are taxonomic
questions associated with it. T Rank applies to a subspecies or variety.
1072 Geneva Avenue, San Francisco CA 91112 • Ph: 415-404-6757 • Cell: 650-269-3894 • Fax: 415-404-6097
E-mail: CRecologv@ gmail.com • www.CRecology.com
* a t M
Debbie Pedro
From:
ECioffi@icorally.com
Sent:
Thursday, February 24, 2011 3:03 AM
To:
Debbie Pedro
Cc:
ECioffi@icorally.com
Subject:
Page Mill Pedestrian Plan
Attachments:
Bridge location.pdf
Importance: High
Debbie,
I walked the area this evening and frankly the logic of this plan escapes me. After long contemplation, I feel that
this plan would not only be impacting to the safety of local residents, but has serious environmental impact as
well. Being very familiar with the area; I challenge the environmental study as incomplete.
These are my perspectives after living next to the creek for almost 20 years, not as someone looking at a paper
map or doing a fly -by environmental study.
Residential Perspective -
Attachment 3
Let's take an imaginary walk from both directions. We are walking from the park -n -ride toward the PM/A
intersection (toward Portola). When you get to the Page Mill Matadero Creek underpass, you can A.) simply walk
straight on dry flat land along Page Mill Road to the PM/A intersection or B.) fork left away from Page Mill through
the wooded and often muddy creekside along the back of Harnett's and Long's property, then take a right to cross
over a pedestrian bridge to get to the PM/A intersection. Why didn't the town just route pedestrian traffic straight
along Page Mill Road? Why send people on an often muddy loop out of their way to walk behind our properties ?
Coming from Arastradero (from Portola)... no one will bother to weave onto this bridge, travel along the wooded
back of the properties only to loop back to Page Mill to get to the corner of Arastradero (toward Los Altos).
Pedestrians and cyclists coming from Arastradero will simply turn left onto Page Mill instead of traversing a bridge
and an out of the way dirt path.
One thing that the bridge will provide is a spotlit access right at the corner of Arastradero and Page Mill to invite
strangers to travel behind the Long and Harnett properties and to all the rear yards of the homes between Berry
Hill and Baled Ranch Rd. A number of the homes along this trail have been easily cased and burglarized.
Why not provide a small bridge next to the existing Page Mill underpass, preserve the environment, and keep
public traffic safely away from the homes ?
By the way, are these trails going to be paved ? As an fyi... You can't cycle on our thorn ridden dirt trails without
replacing your tubes and/or tires the next day. Anyone in the neighborhood with children will tell you that. Joggers
NEVER run on the often water -rutted banks. As to pedestrians, the creekside is muddy a good part of the year.
Unless you enjoy wet hay and mud caked on your shoes, the hard walking surface next to the road is preferred.
Environmental Perspective -
I never mentioned, that the main pedestrian on these trails are deer. Each year, when the hills and upper creeks
run dry, deer and their young gallop at full speed down the right side of the creek until they hit our secluded low
lying creek water. Picture that the deer have nothing left but a narrow wooded corridor a few feet wide with high
fences to the right and a creek and noisy road to the left. Deer bound down the trail to Baled Ranch at full speed,
(occasionally slowing to eat our bushes), then bound at full speed across Baled to the Long's side of the trail to
reach the last remaining water. The area between Baled Ranch and the bottom of Berry Hill is the bottom of a
huge water bowl so to speak. Baled Ranch is completely encircled by hills and therefore has the lowest elevation
and highest water table in the area. Because of this, the remaining creek water here can last well into summer.
This is why swarms of bugs and mosquitos often exist along this part of the trail. Poison oak also flourishes along
this part of the trail. This is also why the creekside and creekbed here remains so muddy for most of the year and
why local residents do not use the trails. Each year, the last remaining water in the entire hill area west of the 280
is in the creekbed behind the Harnett's, the Long's and our property.This is where you intend to invite pedestrians
to travel. After the Harnett's, the creek crosses over to the other side of Page Mill Road.
I've watched the deer in amazement year after year, like clockwork. Most often, the trail is a one way deer
boulevard. They gallop down the trail on the right side of the creek to the last remaining water. In 20 years, I have
not seen a deer cross the busy Page Mill intersection or lay hit by a car. After they reach water, they circle back
up into the hills through the Berry Hill trail system behind the Barnett's. We also have a nice little rabbit population
thriving along the creek as well.
I told you about our chasing poachers who park on Baled and fire at deer coming down the trail from their car
windows. We have called the sheriffs dept on several occasions over the years. The sheriff's have periodically
cited signs of poachers further up in the hills as well. We have called vector control about the mosquitoes. Last
summer, as I recall, larvae eating fish were introduced to the creek to curb the mosquitoes. Surely, deer, rabbits,
other animals and insects depend on this quiet, peaceful and secluded area for access to the last available water
of the season. Will deer begin to run across Page Mill Road at Baled Ranch Road and get hit by cars when you
further invade this narrow creekside corridor and important water supply with pedestrians and cyclists ? If
disturbed, there will be no where else to access water except across Page Mill Road. I would be happy to speak
to the environmentalist involved and Stanford if necessary as to how important it is to not disturb this narrow trail
corridor in any way.
Please advise.
Sincerely,
Edwina Cioffi
14250 Baled Ranch Road
Los Altos Hills, Ca. 94022
Tel 650-949-1234
Edwina M. Cioffi
President / CEO
ICO RALLY / ESCO Components
Tel 650-856-9900 x 240
Fax 650-856-9928
"Debbie Pedro" <dpedro@losaltoshills.ca.gov> To <ECioffi@icorally.com>
cc
02/23/2011 05:20 PM Subject RE: Widening of Arastradero from Baled to Purissima
Hi Mrs. Cioffi,
It was a pleasure speaking with you today. Per our phone conversation, please find attached the site plan showing the bridge
location behind the Long's house. The resolution is not the best as it was scanned. The original file is too large to send
.1� J r
(18MB).
Please let me know if you have any additional questions.
Debbie
Debbie Pedro, AICP, LEED AP
Planning Director
Town of Los Altos Hills
Phone: (650) 947-2517
dpedro@losaltoshills.ca.gov
From: ECioffi@icorally.com [mailto:ECioffi@icorally.com]
Sent: Wednesday, February 23, 2011 10:45 AM
To: Debbie Pedro
Subject: Widening of Arastradero from Baleri to Purissima
Ms. Debbie Pedro,
Is there a model of the proposed one mile Page Mill and Arastradero road widening, retaining walls and pedestrian Creek
bridge ?
Will there be future plans to extend the project beyond one mile ?
Adjacent homes may have concerns about this project.
Residents are more often seen enjoying a walk on their paved neighborhood street then combing through the woody and
sometimes muddy, buggy and dusty dirt trails along their backyards. Sometimes an entire year will go by before we see
someone using the trail. That is, if we don't count the robbers casing our homes from the trails and utilizing them for discreet
access points into our cul-de-sacs. Homes adjacent or close to the pathway system have been exposed to continuos robberies.
These crimes are especially dangerous because many have occurred while residents were at home. To date, 30% of the
homes on Baleri Ranch Road as well as homes on neighboring cul-de-sacs have been robbed or vandalized.
Another concern is the noise impact to homes adjacent to Page Mill. Widening the road will lessen the noise screen between
homes and traffic. This will impact home values of some of the homes along the widening.
Unfortunately, without seeing a model and understanding the positive aspects of the project, adjacent homeowners cannot
ascertain the benefits.
Personally, I wish the town would concentrate more on the safety of residents and unreliable utilities that fail during the
mildest storm. I have failed to see the costly preoccupation with this pathway system nonsense for years. There is plenty of
local open space for outdoor enthusiasts to explore that are far more enjoyable than walking along our back yards.
Frankly, two patrol cars, camera surveillance at key LAH entrance points or a crime watch program would do more for the
entire community than building retaining walls and pedestrian bridges for a little used pathway system. Anyone ever notice
the overgrown weeds and occasional trash in the center divide entering LAH on Page Mill Road ? Do we really care more
about maintaining a seldom used pathway system over our streets and public safety ?
Sincerely,
Edwina Cioffi
14250 Baleri Ranch Road
Los Altos Hills, Ca 94022
Tel 650-949-1234