HomeMy WebLinkAboutPurissima Hills Water District (9)26375 Fremont Road Tel (650) 948-1217
Los Altos Hills, CA 94022 Fax (650) 948-0961
August 3, 2000
Town of Los Altos Hills
26379 Fremont Road
Los Altos Hills, California 94022
Drilling of Emergency Production Well on Town Hall Site
RECEIVED
uo 0 3 20na
TOWN OF LOS ALroS HILLS
Enclosed for your review and comment is a copy of the Purissima Hills Water
District's Initial Environmental Study for the construction of an emergency water supply
well on your property, as well as the Notice of Preparation of Proposed Negative
Declaration and Negative Declaration.
The Notice, of Preparation is scheduled to be published on Tuesday, August 8, in
the San Jose Mercury News. The comment period is thirty days from date of publication.
Enclosures
Sincerely,
Lucy E. Xavier
District Secretary
Service To The Hills Since 1955
Y
PURISSIMA HILLS WATER DISTRICT
NOTICE OF PREPARATION OF PROPOSED NEGATIVE DECLARATION
DRILLING OF EMERGENCY PRODUCTION WELL
Notice is hereby given that the Purissima Hills Water District has prepared a Proposed
Negative Declaration, in accordance with the California Environmental Quality Act ("CEQA"),
on a project to drill an emergency production well approximately 400 feet deep and 10 to 12
inches in diameter in the Town of Los Altos Hills. The project site is located near the northeast
corner of the Los Altos Hills Town Hall property in the Town of Los Altos Hills in Santa Clara
County, California. Copies of the Proposed Negative Declaration and the accompanying Initial
Environmental Study are available without charge at the District's administrative office, 26375
Fremont Road, Los Altos Hills, California 94022, during office hours. The project will not have
a significant effect on the environment.
Written comments on the Proposed Negative Declaration may be submitted to the District
at the above address in the care of Patrick Walter, General Manager of the District, for thirty
days from this date of publication. The proposed project will be discussed at the public meeting
of the Board of Directors at 7:30 pm on Wednesday, September 13, 2000, at the District's
administrative office.
Dated: August 3, 2000
Patrick D. Walter
District General Manager
802354.1
PURISSIMA HILLS WATER DISTRICT
NEGATIVE DECLARATION
DRILLING OF EMERGENCY PRODUCTION WELL
1. Description of the Project: The project consists of the drilling of a production well
approximately 400 feet deep and 10 to 12 inches in diameter in the Town of Los Altos Hills.
A production well will only be drilled if a test well, to be drilled at the same location,
indicates the likelihood of producing at least 200 gallons per minute.
The primary purpose of the project is to provide an emergency water supply for the
Purissima Hills Water District in the event that service from the District's sole present
source, San Francisco's Hetch Hetchy system, is interrupted. The most probable event that
could cause such an interruption is a major earthquake.
2. Location of the Project: The project site is located near the northeast corner of the Los Altos
Hills Town Hall property in the Town of Los Altos Hills in Santa Clara County, California.
3. Proposed Finding: The project will not have a significant effect on the environment.
4. Initial Environmental Study: The reasons supporting the proposed finding are set forth in the
Initial Environmental Study, a copy of which is attached. The Initial Environmental Study
was prepared by Berryman & Henigar, Inc., District Engineers for the Purissima Hills Water
District. A copy of the study may be obtained at the District's administrative office, 26375_
Fremont Road, Los Altos Hills, California 94022.
Mitigation Measures: Since no potentially significant environmental effects, no mitigation
measures are required or appropriate.
Dated: September 13, 2000
Patrick Walter
District General Manager
802342.1
INITIAL ENVIRONMENTAL STUDY
CONSTRUCTION OF AN
EMERGENCY WATER SUPPLY WELL
LOS ALTOS HILLS TOWN HALL SITE
TOWN OF LOS ALTOS HILLS
AND
SANTA CLARA COUNTY, CALIFORNIA
PURISSIMA HILLS WATER DISTRICT
26375 FREMONT ROAD
LOS ALTOS HILLS, CALIFORNIA 94022
INITIAL STUDY
I. BACKGROUND
A. Lead agency: Purissima Hills Water District
B. Address: 26375 Fremont Road
Los Altos Hills, California 94022
C. Name, address and phone number of person to be contacted concerning this project:
Patrick Walter, General Manager
Purissima Hills Water District
26375 Fremont Road
Los Altos Hills, California 94022
(650) 948-1217
II. PURPOSE AND DESCRIPTION OF PROJECT
The Emergency Water Supply Well Project proposes to drill a production well approximately 400
feet deep and 10 to 12 inches in diameter, to be located near the northeast corner of the Town of
Los Altos Hills Town Hall property (see Figures 1 and 2). A production well will be drilled only
if a test well, to be drilled at the same location, indicates the likelihood of producing at least 200
gallons per minute (gpm), which is the minimum yield deemed useful to the District even under
emergency conditions.
The purpose of this project is to provide an emergency water supply for the Purissima Hills Water
District in the event that service from the District's sole present source of water, San Francisco's
Hetch Hetchy system, is interrupted. The most probable event that could cause such an
interruption is a major earthquake. The District will not use the well for normal service since
groundwater quality in this area, while potable, is highly mineralized. Thus there will be little or
no impact on groundwater levels in the area.
The first phase of the project will be test hole drilling. The test hole will be 7- to 8 -inches in
diameter and approximately 400 feet deep. During drilling operations, a hydrogeologist will be on
site to observe the work and document subsurface conditions. Samples of the cuttings taken at
selected intervals will be geologically logged. Sieve analyses will be run on these samples for well
screen slot -size determination, as required. Following drilling, an electrical log, consisting of
resistivity and spontaneous potential will be run.
There is no test pumping associated with this task, only drilling and logging. The work requires a
drill rig on site. The District will periodically remove the material removed from the hole from the
site using their loader and truck. Drilling mud will be recirculated and kept from flowing offsite.
After all exploratory work has been completed, the test hole will be "destroyed" (i.e., filled) per
1
Santa Clara Valley Water District (SCVWD)/State Department of Water Resources (DWR)
requirements.
A production well, if warranted by the test hole results, will be designed. It will be drilled
adjacent to the test hole site, a few feet away. The drilling procedure for the production well will
be similar to that employed for the test hole except the hole will be larger, requiring the removal
of more material, which will also be trucked from the site. Additionally, casing and screens will
be installed, as well as a gravel pack and concrete surface seal all in accordance with
SCVWD/DWR requirements. A hydrogeologist will be on site to observe the drilling process, the
installation of casing and screens, the placement of the gravel pack and the installation of the
surface sanitary seal.
The completed well must be developed and then test pumped to establish the safe yield of the
well. The pumping test will be performed in accordance with applicable SCVWD/DWR
requirements. Drawdown and recovery measurements will be taken in order to determine the safe
yield for the well. A report will be prepared by the hydrogeologist summarizing information
collected during the project, including the basis for estimating safe yield.
A conceptual design of the well station has been developed, as shown on Figures 3 and 4. The
well station will include the following features:
1. Well Puma - The size and characteristics of the pump selected will depend on the
safe yield and drawdown data for the well. The pump will be a submersible -type
unit, likely 6- or 8 -inches on diameter.
2. Surface Construction Features - All openings at the top of the well will be capped
or plugged to prevent the entrance of surface water and foreign matter. As shown
on Figure 4, the well will be equipped with a screened and vented casing vent, an
air release valve, a pressure gage, a sample cock and a flowmeter. All piping will
be ductile iron pipe.
3. Electrical Panel - Pump switchgear and controls will be housed in a small panel
adjacent to the well.
4. Chemical Feed and Storage Facility - Chlorine gas (i.e., in pressurized cylinders)
will not be used at the well facility. Chlorine in this form is hazardous. Sodium
hypochlorite (i.e., a more concentrated version of household bleach) will be used.
Being a liquid, it does not present a gas release hazard.
The chemical and its feed pump will be housed in a small building adjacent to the
well to provide containment in the event of a spill and to mitigate against
vandalism. No chemical will be kept on site unless an emergency condition exists,
requiring the use of the well, since the chemical deteriorates with extended
storage. When on site, the sodium hypochlorite solution will be stored in plastic
2
drums or tanks which will be double -contained. Double -containment is a
requirement of fire authorities and OSHA.
The volume of sodium hypochlorite needed on site will depend upon the capacity
of the well, which is now an unknown because neither a test hole or the well itself
has yet been drilled. The District's target capacity is in the 200 to 500 gallon per
minute (gpm) range. Assuming an average chlorine dose (i.e. 3 parts per million),
the daily hypochlorite solution requirement would range from 7 gallons per day
(gpd) at a 200 gpm well production rate to 18 gpd at 500 gpm. This is equivalent
to a chemical requirement of 50 to 125 gallons per week.
III. ENVIRONMENTAL SETTING
A. INTRODUCTION
The project area is located entirely within the boundaries of the Town of Los Altos Hills and the
County of Santa Clara. The emergency water supply well will be located immediately west of the
Los Altos Hills Town Hall parking lot approximately 150 feet east of Fremont Road,
B. GEOLOGICAL SETTING
The Purissima Hills Water District engaged Geoconsultants, Inc. to perform a geological and
geophysical survey for locating possible sites within the District for constructing one or more
emergency supply wells. The full text of their report, dated August 26, 1998, is included as
Appendix A. The following is a description of hydrogeological conditions in the area which has
been taken from this report:
"The area surveyed is on the west side of the Santa Clara Valley, in Los Altos Hills,
California. The majority of the District is underlain with rocks belonging to the upper
Pliocene to lower Pleistocene Santa Clara Formation. This unit consists of weakly to
moderately consolidated lenticular beds of pebble and cobble gravel with lesser amounts of
sand, silt, and clay (Pampeyan, 1993). This unit was deposited in a fluvial and alluvial
setting as streams drained the highlands to the west. Cummings (1968) divided the Santa
Clara Formation into several distinct lithofacies based on clast composition. According to
Vanderhurst and others (1982), the Arastradero facies is overlain by the Searsville facies
in the Los Altos Hills area. Gravels of the Arastrasdero facies consist mainly of red chert,
graywacke and arkosic sandstone, laminated siliceous shale, and siliceous volcanic rocks
enclosed in a fine sand matrix (Cummings, 1968). The Searsville facies gravels are
composed of greenstone, graywacke, and arkosic sand stone clasts, with chert clasts being
subordinate (Cummings, 1968). The Santa Clara Formation unconformably overlies rocks
of Pliocene and older age, and may be as thick as 500 feet in the study area (Pampeyan,
1993).
"The primary ground -water reservoir materials are the sands and gravels found in the
Santa Clara Formation. The underlying bedrock formations, such as the Ladera Sandstone
91
and the Monterey Shale, are generally considered to be non -water bearing unless highly
fractured. Some geologic structures including minor faults and folds occur within the
survey area, and may create compartments and barriers to ground -water flow in some
instances.
"In general, ground -water is produced from those materials exhibiting a .more granular
nature, such as gravels and sands within the Santa Clara Formation. Our survey was
directed toward identifying such favorable environments with particular reference to
delineating the thickest sections of saturated materials in the subsurface portions of the
Santa Clara Formation. Locations exhibiting the thickest sections of saturated material
will have the best potential to supply the maximum quantity of ground -water to
production wells."
C. BIOLOGICAL SETTING
The area supports a growth of native grasses and trees which are typical of the Oak -Woodland
Biotic community which is common throughout the Town of Los Altos Hills.
The following lists include those birds, mammals, and reptiles which have been observed in the
Los Altos Hills area and may be considered as possible and occasional users of the property.
Representative Vertebrate Fauna include:
MAMMALS BIRDS REPTILES
Bobcat
Bushtit
Mockingbird
Alligator Lizard
Chipmunk
Dove
Owl
Fence Lizard
Cotton Tail
Chickadee
Pigeon
Horned Lizard
Coyote
Gndtcatcher
Quail
Newt Mule
Deer
Finch
Robin
Garter Snake
Grey Fox
Flicker
Sparrow
Gopher Snake
Pocket Gopher
Flycatcher
Swallow
King Snake
Deer Mouse
Hawk
Thrasher
Rattlesnake
California Mouse
Hummingbird
Towhee
Skink
Bush Rabbit
Jay
Warbler
Red -legged Frog
Shrew
Crow
Wren
Yellow -legged Frog
Wood Rat
Kingtit
Wrentit
Coast Range Newt
Vireo
Bat (any species)
Rabbits and deer have been observed occasionally in the past within the area, however none of
these has been observed as residents. None of the plant communities, wildlife or plant species
observed are considered significant or of such limited occurrence as to justify protection. No
threatened or endangered species as established by the U.S. Fish and Wildlife Service have been
observed on the site or are believed to occur on the site because of a lack of suitable habitat.
El
IV. IDENTIFICATION OF ENVIRONMENTAL EFFECTS
A. ENVIRONMENTAL CHECKLIST
A review of the environmental impacts of this proposed project has been undertaken in
accordance with the California Environmental Quality Act and the implementing regulations and
guidelines issued by the California Resources Agency.
The review is divided into two parts. The checklist which follows indicates, for each of a number
of potential areas of impact, whether the project will, will not, or might produce an effect.
Thereafter, in Part IV B, there is a discussion of certain areas of impact in which the review
indicates the possibility of an effect. Those items marked with an "asterisk" are the subject of
further explanation in Part IV.B although these items are not deemed to identify areas of
significant impact.
5
Yes Maybe No
1. EARTH Will the project:
a. Cause unstable earth conditions or changes in X
geologic substructures?
b. Disrupt, displace, compact or cover the soil? X*
C. Change the topography? X
d. Affect a unique physical feature? X
e. Increase soil erosion? X
f. Change deposition or erosion of a beach, a X
stream channel, or the bed of a water body?
g. Expose people or property to hazards such as X
earthquakes, landslides, mudslides, or ground
failures?
2. AIR Will the project:
a. Emit air pollutants, or cause air quality to X*
deteriorate or contribute to an air quality
violation?
b. Create objectionable odors? X
C. Change the local or regional climate? X
3. WATER Will the project:
a. Change the flow of water in marine or fresh X
waters?
b. Change the infiltration rate, the runoff rate, X
or the drainage pattern?
Cl
Yes Maybe No
3. WATER Will the project: (cont.)
C.
Change the course of flow of flood waters?
d.
Change the amount of water in any body of
water?
e.
Change the quality of surface waters?
f.
Change the direction or rate of flow of ground -
waters?
g.
Change the quantity and/or quality of ground -
waters?
h.
Reduce the amount of water otherwise available
for public water supply?
i.
Expose people or property to water -related
hazards?
j.
Change the temperature, flow or chemical content
of surface thermal springs?
4. PLANT LIFE Will the project:
a. Change the diversity of species, or the number
of plants?
b. Reduce the numbers of unique, rare or endangered
plants?
C. Introduce new species of plants into an area,
or create a barrier to normal replenishment of
species?
X
X
X*
X*
X*
X
MM
X
X*
X
X
U. Reduce acreage of a crop? X
7
• 'b
Yes Maybe No
5. ANIMAL LIFE Will the project:
a. Change the diversity of species, or the numbers X
of animals?
b. Reduce the number of unique, rare or endangered X
animals?
C. Damage fish or wildlife habitat? X
6. NOISE Will the project:
a. Increase noise levels? X*
b. Expose people to severe noise? X
7. LIGHT AND GLARE Will the project:
a. Produce new light and glare? X
8. LAND USE Will the project:
a. Change the present or planned land use of an X
area?
b. Use Prime Agricultural land, or lands from a X
Timber Production Zone?
9. NATURAL RESOURCES Will the project:
a. Use more natural resources? X
b. Deplete nonrenewable natural resources? X
10. RISK OF UPSET Will the project:
a. Cause an explosion or release hazardous sub-
stances?
b. Interfere with emergency response or emergency
evacuation plans?
11. POPULATION Will the project:
a. Alter the location, distribution, density or
growth rate of the human population in the area?
12. HOUSING Will the project:
a. Affect existing housing, or create a demand
for additional housing?
13. TRAFFIC/CIRCULATION Will the project:
a. Generate more traffic?
b. Affect parking facilities, or need new parking?
C. Affect transportation systems?
d. Alter circulation patterns?
e. Alter water, rail or air traffic?
f. Increase hazards to vehicles, bicycles or
pedestrians?
14. PUBLIC SERVICES Will the project affect:
a. Fire protection?
b. Police protection?
9
Yes Maybe No
X
X*
X
X
X
X
X
X
X
X
X
14. PUBLIC SERVICES Will the project affect: (cont.)
C. Schools?
d. Parks and other recreational facilities?
e. Maintenance of public facilities, including
roads?
f. Other governmental services?
15. ENERGY Will the project:
a. Use substantial amounts of fuel or energy?
b. Increase the demand for energy?
16. UTILITIES Will the project affect these utilities:
a. Power or natural gas?
b. Communications?
C. Water?
d. Sewer or septic tanks?
e. Storm drainage?
f. Solid waste and disposal?
17. HUMAN HEALTH Will the project:
a. Create a hazard to health (excluding mental
health)?
b. Expose people to potential health hazards?
10
Yes Maybe No
X
X
X
X
X
X
X
X
X*
X
X
X
X
X
18. AESTHETICS Will the project:
a. Obstruct a scenic view that is open to the
public, or create an ugly view?
19. RECREATION Will the project:
a. Affect recreational opportunities?
20. CULTURAL RESOURCES Will the project:
a. Affect a prehistoric or historic archaeological
site?
b. Affect a prehistoric or historic building,
structure or object?
C. Cause a physical change which would affect
unique ethnic cultural values?
d. Restrict existing religious or sacred uses
within the potential impact area?
21. MANDATORY FINDINGS OF SIGNIFICANCE
a. Does the project have the potential to degrade
the quality 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, re-
duce the number or restrict the range of a
rare or endangered plant or animal species
or eliminate important examples of the major
periods of California history or prehistory?
Yes Maybe_ No
1
X
X
X
X
X
Yes Maybe No
21. MANDATORY FINDINGS -OF SIGNIFICANCE (cont.)
b. Does the project have the potential to achieve X
short term, to the disadvantage of long
term, environmental goals? (A short term
impact on the environment is one which
occurs in a relatively brief, definite period
of time while long term impacts will endure
well into the future).
C. Does the project have impacts which are in- X
dividually limited, but cumulatively con-
siderable? (A project may impact on two or
more separate resources where the impact on
each resource is relatively small, but
where the effects of the total of those
impacts on the environment is significant).
d. Does the project have environmental effects -X
which will cause substantial adverse effects
on human beings, either directly or indirect-
ly?
B. DISCUSSION OF ENVIRONMENTAL EFFECTS
Items which follow are referenced by number to the Environmental Checklist (Section IV. A) and
describe measures, if any, which can be taken by the District to mitigate potential adverse effects
or provide further explanation on certain issues as to why the project will not produce any impact
or only a short-term effect.
Lb. Temporary disruption of the soil will occur during test hole and production well drilling,
during well station construction and during trenching for the installation of the pipeline that will
connect the well with the water system. These activities will result in a small quantity of surplus
material which must be disposed of legally. The District will be responsible for removing and
disposing of surplus material. Due to the limited scope and temporary nature of the excavation
and debris removal operations, the impacts upon the environment will not be significant.
2.a. Appropriate air pollution control measures will be applied to control any temporary
increases in airborne dust during construction.
3.d.&e.Water will be imported to the project site for use in drilling, and any excess will be
removed by tank truck after completion of the project. Drilling fluids will be recycled throughout
12
the drilling phase of the project and will be reclaimed to be removed by tank truck. No drilling
fluids will be discharged to the storm drain on site, which drains to Barron Creek.
Only clean water will be discharged to the storm drain during the pumping test for the production
well. Prior to beginning the pump test, all drilling and construction fluids will be suctioned from
the well and removed from the site by tank truck.
The initial surge of water from the pump test is expected to contain some fine sediment that will
have remained trapped in the gravel envelope. To ensure that only clean water is discharged to
the storm drain, the initial surge from the pump test will be discharged into a baffle tank and
removed from the site by tank truck.
3.f.&g.Because this well will only be used under emergency conditions, its impact on groundwater
quantities, direction of flow and quality will be negligible. The few wells in the area are used only
for irrigation owing to the poor mineral quality of the groundwater.
4.a. A small amount of existing grasses, plants, and foliage will have to be removed during
construction. All areas disturbed during construction will be revegetated and restored.
6.a. Temporary increases in ambient noise levels caused by construction equipment would have
an insignificant short-term impact. Construction noise would not produce any long-term effect.
Since the well pump will be of the submersible type (i.e., both the pump and the motor will be
installed down the well under water), there will be no noise due to pumping when the well is in
operation.
1 La. The project is not growth -inducing in that the well will be used only in emergency
situations.
16.c. The project will provide an emergency source of water for District customers, thus
improving the reliability of service within the project area.
V. MITIGATION
No potentially significant environmental effects are noted, therefore mitigation measures are not
applicable.
VI. COMPATIBILITY WITH EXISTING ZONING AND PLANS
The project is consistent with existing zoning and plans.
VII. NAME OF PARTICIPANTS
This initial study was prepared for the Purissima Hills Water District by Berryman & Henigar,
Inc., District Engineers, for the Purissima Hills Water District, and was reviewed by
Geoconsultants, Inc., who are the project hydrogeologists.
13
VIII. DETERMINATION
On the basis of this Initial Study, it is found that the proposed roject COULD NOT have a
significant effect o the environment, and a NEGATIVET
L TIO will be prepared.
Dated:3 A i
/ P tri . Walter, General Manager
14
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