Loading...
HomeMy WebLinkAboutItem 3.1�.I TOWN OF LOS ALTOS FELLS January 4, 2007 Staff Report to the Planning Commission RE: NEGATIVE DECLARATION AND TENTATIVE MAP FOR A TWO -LOT SUBDIVISION: LANDS OF MOELLER, 11990 PAGE MILL ROAD. FILE #132- 06 -IS -ND -TM -GD. FROM: Brian Froelich, AICP, Associate Planner APPROVED BY: Debbie Pedro, AICP, Planning Director �9 RECOMMENDATION That the Planning Commission: 1. Review, make comments, and forward a recommendation that, based on the Initial Study, the City Council adopt the Mitigated Negative Declaration and Mitigation Monitoring Program in Attachment 3; and 2. Forward a recommendation that the City Council approve the requested Tentative Map, based on the findings in Attachment 2 and subject to the conditions of approval in Attachment 1. DISCRETIONARY ACTIONS The following discretionary actions by the City Council are required for approval of the subdivision: 1. Adoption of the Mitigated Negative Declaration and Mitigation Monitoring Program 2. Approval of the Tentative Map The Planning Commission's actions are recommendations to the City Council. TENTATIVE MAP REVIEW In order to approve a subdivision, the Planning Commission must determine that the project is consistent with the General Plan, Subdivision and Zoning Regulations, and that none of the findings for denial can be made, as specified in Section 66474 of the State Subdivision Map Act. Staff has prepared findings for approval of the project (Attachment 2). Comments on the Tentative Map have been received from the Town Geotechnical Consultant, the Town Engineer, Santa Clara County Fire Department, PG&E, the Environmental Design Committee, the Pathways Committee, and the Open Space Committee; and are attached for the Planning Commission's review. Neighboring residents and property owners within 500 feet of the site have been notified of the public hearing. Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 2 of 15 Of\VC0LILIW 11 273 117► / In compliance with the California Environmental Quality Act (CEQA), an Initial Study, Mitigated Negative Declaration and Mitigation Monitoring Program have been prepared for the project. The review period for the Negative Declaration will end on January 31, 2007. The Planning Commission may make comments on both the Negative Declaration and the Tentative Map. The Negative Declaration must be adopted by the City Council before approving the Tentative Map. In order to recommend adoption, the Commission must find that all potential significant environmental effects are addressed through the proposed mitigation measures. Recommended mitigation measures include geotechnical review of site development plans, site-specific drainage improvements, site-specific erosion and sedimentation control, installation of a fire hydrant or sprinklered buildings as required by the Fire District; tree protection during construction, and observation of State and County requirements for handling archaeological remains and artifacts if found. PROJECT DESCRIPTION The applicant is requesting approval of a two -lot subdivision on a 3.13 gross acres parcel located at the comer of Page Mill Road and Central Drive. The parcel is bounded by Page Mill Road to the north and west, Central Drive to the south, and a residential lot containing a single-family dwelling to the east. The existing parcel is developed with two residential dwellings and several accessory structures. The site contains over 20 heritage oak trees and has a natural drainage Swale that runs west to east across the property. The site has an average slope of 16.5%. The surrounding land uses are low density single- family residential and Foothills Park (Palo Alto) to the north across Page Mill Road. Existing Development' Table Proposed Development Table Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 3 of 15 Lot Desi Hn and Buildinz Si Parcel A is 1.21 net acres with a slope of 15%; Parcel B is 1.44 net acres with a slope of 11.5%. The tentative map shows a 160 -foot diameter building circle on each lot, indicating that each contains a viable building site. Both parcels are moderately sloped with a down sloping trend from southwest to northeast. Parcel A has oak, willow and eucalyptus trees spread generally around the perimeter of the 160 foot building circle. Parcel B contains a large number of trees including oak, elm, bay, sequoia, walnut, and eucalyptus. Developers of both parcels will be required to remove the existing eucalyptus trees from the property at the time of site development. Sheet C-2 shows conceptual building sites. Both conceptual development plans assume a two story design and do not account for accessory uses and structures. Utilities Water supply will be provided by Purissima Hills Water District. Both parcels are to be connected to the sanitary sewer system that will be extended from in front of 27600 Altamont Road. This sewer extension will be approximately 650 feet in length and will be served by a force main. PG&E will provide gas and electric services underground and SBC Communications will provide telephone service. Access Access to the project site currently is provided via a driveway entrance off Page Mill Road. The existing driveway will be abandoned and two new driveways will be extended from Central Drive to the new residences. Parcel B contains an ingress/egress easement for the benefit of Parcel A. The Santa Clara County Fire Department requires a 14 -foot - wide paved driveway for each dwelling with a maximum slope of 15%. Additional study of the proposed driveways will be undertaken at the time of site development plan review. 1n accordance with Section 10-2.1202 of the Municipal Code, the Town Engineer is recommending the dedication of 10 feet of right-of-way along the Page Mill Road frontage and a 30 foot right of half -width on Central Drive as shown on the Tentative Map. This will allow the minimum required 30 foot half -width for both rights-of-way. (Condition of Approval #3) Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 4 of 15 Geotechnical Review The Town's Geotechnical Consultant, Cotton, Shires and Associates has reviewed the proposed Tentative Map, engineering geologic feasibility study provided by the applicant dated July 6, 2006, and a soils report dated October 6, 2006. Cotton, Shires and Associates concurred with the project geotechnical consultant that adequate site investigation has been completed to support the geotechnical feasibility of the proposed subdivision. Site constraints exist such as potential for strong seismic ground shaking and the potential for subsurface seepage if a basement is incorporated in the design. The existing constraints will be explored further and mitigated in conjunction with site specific designs. Cotton, Shires and Associates recommend approval of the Tentative Map with requirements for additional investigation related to future residential development of Parcels A and B. (Condition #1) Draina¢e The Conceptual Development Plan shows a storm drain retention system to capture water runoff from the proposed development on both parcels. The detention system on parcel B would lead to a new earthen Swale on parcel A that extends north along the eastern property boundary to the natural drainage swale on site. The Town Engineer is requiring a final grading and drainage plan to be submitted for review prior to approval of the Final Map. All required drainage improvements shall be constructed or bonded for prior to recordation of the Final Map (Conditions # 4 and 5). COMMITTEE REVIEW Subdivision Committee The Subdivision Committee comprised of Commissioner Harpoothan, the Planning Director, the Town Engineer, and Planning and Engineering staff convened on December 19, 2006 to review and discuss the subdivision proposal. Pursuant to Section 9-1.509 of the Los Altos Hills Municipal Code, neighbors within 500 feet of the property were notified of the hearing. A summary of the discussion at the Subdivision Committee meeting is provided on the fact sheet and hearing report (Attachments 7 and 8). The issues discussed at the Subdivision Committee meeting are as follow: 1. There was a question as to why the plan did not show details of the existing septic system or a detail of the existing wells. 2. A neighbor, Frank Dietrich, 12541 Zappettini Court, commented that his property currently receives concentrated runoff from a culvert under Central Drive. His property is the first property along the north (downslope) side of Central Drive that Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 5 of 15 has a culvert. The culvert leads to a natural swale on Mr. Dietrich's property. Mr. Dietrich requested that Town staff or the applicant address this issue and to share the drainage burden by possibly installing another culvert on the Moeller property to catch upslope water or to install rip -rap and erosion control measures on his property. Staff notes the following in response to the preceding comments: 1. The Town Engineer has required that detailed plans be submitted prior to subdivision improvements. The plans would contain details regarding the septic and well abandonment. Further, permits must be obtained from Santa Clara Valley Water District for the wells and the Santa Clara County Health Department for the septic abandonment. (Conditions #13 and 15) 2. Staff met with Mr. Dietrich and the project engineer, Jeff Lea at the site on December 19, 2006 to assess the current drainage installations in the area. Planning and Engineering staff also made a return visit during a rainstorm on December 20, 2006 to gain further understanding of drainage patterns in the area. All upslope drainage from Page Mill Road is contained by a culvert at the Central Drive entrance. This culvert directs the water across Page Mill Road (away from Central Drive) and down to a 24" corrugated metal drain pipe that crosses back under Page Mill Road and onto the natural drainage Swale at the north end of Parcel A. Drainage from the first four residential properties along the south side (upper side) of Central Drive is collected in a drainage ditch on the shoulder of the south side of Central Drive. This drainage ditch collects water from the upper hillside for approximately 700 linear feet and then is directed into the culvert and onto Mr. Dietrich's orouertv. Planning Commission Lands of loan K. Moeller Trust January 4, 2007 Page 6 of 15 In order to require additional drainage installations or mitigation the Town must establish a nexus or correlation between the proposal and an increased drainage impact. No additional drainage would be directed into the drainage ditch on the south side of Central Drive as a result of this subdivision. Further, the proposed conceptual drainage systems comply with Town standards. Detailed plans will be reviewed at the time of proposed development. The Town requires that all new development not exceed predevelopment runoff. l.gndsof 3.00 AC Moeller 3.20 AC f/YOs°y `0 55B/ Rpl. O -Culverts Drainage Ditch 1t —► -Drainage Pattern Drainage coming off the Uphill side of Central Drive It is evident that a neighborhood drainage could be improved but staff cannot Find a nexus to require the project applicant to resolve the issue when the proposal does not exacerbate or impact the existing problem. Environmental Design Committee The committee recorded comments regarding preservation of the heritage oak trees and other large specimens on both parcels. Project conditions require that existing trees be retained to the greatest extent feasible. (Condition# 18) • T�� 45 °sem • _ I.I6 AC. 46 -' PCL.I F L40 AC v 2.20 AC pR, PLLE y+•l � LOT E Q=t�(�� \ 1.09 AC \ b 9 y+. .L6 .9 I- l.gndsof 3.00 AC Moeller 3.20 AC f/YOs°y `0 55B/ Rpl. O -Culverts Drainage Ditch 1t —► -Drainage Pattern Drainage coming off the Uphill side of Central Drive It is evident that a neighborhood drainage could be improved but staff cannot Find a nexus to require the project applicant to resolve the issue when the proposal does not exacerbate or impact the existing problem. Environmental Design Committee The committee recorded comments regarding preservation of the heritage oak trees and other large specimens on both parcels. Project conditions require that existing trees be retained to the greatest extent feasible. (Condition# 18) Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 7 of 15 Pathwav Committee The Pathway Committee recommends dedication of a 10 foot Pathway Easement and construction of a Type II -B path along Page Mill Road. The path should span the entire Page Mill Road frontage of both lots and be separated from the road by a minimum of five feet. (Condition #9) The project engineer, Jeff Lea has written a letter requesting that the pathway requirement be changed to an in lieu fee. Mr. Lea believes that the blind curve and the terrain create an unsafe circumstance for pedestrians. (Attachment #11) Open Space Committee The Open Space Committee commented that the natural drainage swale and slopes over 30% on parcel A should be undeveloped and dedicated Open Space. The applicant has agreed to offer this area as Open Space Easement as shown on tentative map page C-1. (Condition# 22) CONCLUSIONS Based on the Initial Study, staff has concluded that the proposed project, as mitigated, will not have a significant effect on the environment. The Negative Declaration identifies specific mitigation measures and establishes a Mitigation Monitoring Program to ensure that any potential significant environmental impacts identified in the Initial Study are mitigated. Staff has also concluded that, as documented in the recommended findings of approval, the proposed subdivision is in compliance with the General Plan and Subdivision Ordinance, and would allow development to occur that meets the provisions of the Zoning and Site Development Ordinances. ATTACHMENTS 1. Recommended Conditions of Approval 2. Recommended Findings for Subdivision Approval 3. Initial Study, Negative Declaration & Mitigation Monitoring Program 4. Cotton, Shires and Associates report, November 15, 2006 5. Santa Clara County Fire Department comments, August 2, 2006 6. PG&E letter, August 1, 2006 7. Subdivision Committee hearing fact sheet, December 19, 2006 8. Subdivision Committee hearing report, December 19, 2006 9. Environmental Design Committee comments, August 14, 2006 10. Pathways Committee minutes, September 25, 2006 11. Letter from Jeff Lea requesting no pathway installation, November 7, 2006 12. Tentative Map plan set (Commission only) Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page g of 15 cc: Jeff Lea Lea and Braze Engineering 2495 Industrial Parkway West Hayward, CA 94545 Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 9 of 15 Y : .lul TO RECOMMENDED CONDITIONS FOR THE TWO LOT SUBDIVISION OF A 2.91 -ACRE PARCEL LANDS OF JOAN K. MOELLER TRUST, 11990 PAGE MILL ROAD FILE #132 -06 -IS -ND -TM -GD This project is also subject to the Mitigation Measures included in the attached Initial Study and Negative Declaration. 1. Detailed Geotechnical InvesGeations — Prior to approval of site development applications on individual lots, detailed design -level geotechnical engineering investigations shall be completed for proposed project improvements (with ASTM approved borings). Appropriate subsurface investigations shall be completed to characterize the distribution and engineering index properties of site earth materials (existing fill materials, colluvium, alluvium, bedrock, etc.). Recommended geotechnical design parameters shall be prepared for proposed improvements. The following items shall be specifically addressed during site investigations: a) The plan view distribution and depth of existing fills (or other deleterious materials to be removed/reworked during site grading) shall be characterized and illustrated in plan view and cross section. b) Detailed geotechnical design criteria shall be prepared for any proposed basements with emphasis on mitigation of subsurface seepage. C) Areas of previous exploratory trench excavation shall be delineated and identified for removal and recompaction of loose backfill materials. d) Consideration shall be given to extending all house foundation piers to achieve embedment into underlying bedrock materials. e) Anticipated seismic ground shaking conditions shall be characterized considering the close proximity of the Berrocal fault. Appropriate Uniform Building Code seismic design parameters should be provided. Planning Commission Lands of Joan K. Moeller Tmst January 4, 2007 Page 10 of 15 Appropriate documentation to address the above shall be submitted to the Town for review by the Town Engineer and Town Geotechnical Consultant prior to approval of site development applications for individual lots. LAND AND EASEMENT DEDICATION 2. The applicant shall relocate or abandon existing public utility easements and grant new public utility easements where needed to all utility companies for utility construction and maintenance, including but not limited to: SEC Telephone Company, Pacific Gas and Electric Company, Comcast Cable Television, and Purissima Hills Water District. The dedications shall all be completed in conjunction with Final Map approval, to the satisfaction of the City Engineer. 3. The applicant shall dedicate right-of-way on Page Mill Road and Central Drive to the Town of Los Altos Hills to create a 30' wide half -street right of way as measured from the existing centerline as shown on the tentative map. The dedication shall be irrevocable and the road right-of-way shall be located to the satisfaction of the Town Engineer. 4. A grading and drainage plan which includes an erosion control plan shall be submitted for review and approval by the City Engineer as part of the subdivision improvement plans. This plan shall conform to all standards adopted by the Town of Los Altos Hills and shall comply with all appropriate requirements of the Town's NPDES Permit relative to grading and sediment erosion control including but not limited to: a) restricting grading during the moratorium from October 15 to April 15 except with prior written approval from the Town Engineer; b) protecting all finished graded slopes from erosion using such techniques as hillside benching, erosion control matting and/or hydroseeding; c) protecting downstream storm drainage inlets from sedimentation; d) appropriate use of sediment rolls to retain sediment on the project site; e) any other suitable measures outlined in the ABAG Manual of Standards. 5. The on-site and off-site drainage improvement shall be designed as surface flow whenever possible to avoid concentration of runoff. The proposed drainage shall be designed to maintain the existing flow patterns. The applicant shall design and construct all subdivision drainage improvements as deemed necessary by the City Engineer. Storm drainage design shall be for the 100 year storm with one hour rainfall duration and shall include hydrology calculations of the existing downstream drainage channels and pipes that will receive drainage from the subdivision to determine if they have adequate capacity to safely accommodate the additional flows. All required drainage improvements including the earthen Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 11 of 15 swale along the east property line of Parcel B shall be constructed or bonded for prior to recordation of the Final Map. 6. Both lots within the subdivision shall be connected to the public water system to the satisfaction of the City Engineer and Purissima Hills Water District. Services shall be installed to the property lines or be bonded for prior to recordation of the Final Map. An encroachment permit shall be required to be issued by the Public Works Department for all work proposed within the public right of way. Any necessary fees shall be paid prior to the recordation of the Final Map. All existing and proposed utilities located within the subdivision that serve the subdivision shall be placed underground, in accordance with Subdivision Ordinance, Sec. 9-1.1105. Cable television, gas, electric, and telephone services, to the property lines are included in this requirement. Plans for the location of all such utilities are to be included in the improvement plans for the subdivision. Improvements shall be installed or bonded for prior to recordation of the Final Map. 8. Both lots within the subdivision shall be connected to the public sanitary sewer system. The applicant shall be required to obtain permission from the Killian and Lee for connecting the sewer line into their private sewer force main prior to recordation of the Final Map. All sanitary sewer improvements shall be constructed to the satisfaction of the City Engineer. An encroachment permit must be obtained from the County of Santa Clara Public Works Department for all work proposed within the public right of way. Services shall be installed to the property lines or bonded for prior to the recordation of the Final Map. 9. A Type UB pathway shall be constructed along the Page Mill Road frontage. The path shall be separated from the edge of pavement by five feet minimum, and to meander around trees and power pole as necessary. Improvements shall be bonded for or constructed to the satisfaction of the City Engineer prior to recordation of the Final Map. 10. A grading and construction operation plan shall be submitted by the subdivider for review and approval by the City Engineer and Planning Director prior to issuance of any permits for subdivision improvements. The grading/construction operation plan shall address truck traffic issues regarding dust, noise, and vehicular and pedestrian safety on Magdalena Road and other surrounding roadways; storage of construction materials; placement of sanitary facilities; parking for constmction vehicles; and parking for construction personnel. A debris box (trash dumpster) shall be placed on site for collection of construction debris. Arrangements must be made with the Los Altos Garbage Company for the debris box, since they have a franchise with the Town and no other hauler is allowed within the Town limits. Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 12 of 15 11. Improvement plans for the subdivision shall be submitted for review and approval by the Town Engineer prior to commencement of improvement work. These plans shall conform to all standards adopted by the Town of Los Altos Hills. 12. All subdivision conditions of approval and subdivision improvements shall be constructed and approved by the Town Engineer prior to issuance of any site development or building permits. 13. Any, and all, wells on the property shall be shown on the Improvement Plans, shall be properly registered with Santa Clara Valley Water District (SCVWD), and shall be abandoned, capped in accordance with the SCV WD standards. 14. All existing structures located within the building setback lines shall be removed prior to recordation of the Final Map. 15. The existing septic tanks on site shall be removed or abandoned per the County of Santa Clara Health Department prior to recordation of the Final Map. PLANNING AND ZONING 16. Payment of park and recreation dedication fees and all other applicable fees shall be required prior to recordation of the Final Map. The park and recreation dedication fees shall be provided in accordance with sections 9.1.1403 and 9.1.1404 of the Los Altos Hills Municipal Code. 17. The applicant shall inform the Town of any damage and shall repair any damage caused by construction of the subdivision improvements to pathways, private driveways and public and private roadways prior to final acceptance of the subdivision by the Town. The applicant shall provide the Town with photographs of the existing conditions of the roadways and pathways prior to recordation of the Final Map. 18. Prior to beginning any grading or construction operations, all significant trees shall be fenced at the dripline; and shall be of material and structure to clearly delineate that dripline. Town staff must inspect the fencing and trees to be fenced prior to starting grading or construction. The fence must remain in place throughout the course of construction. No storage of equipment, vehicles or debris shall be allowed within the driplines. All large and heritage trees shall be retained to the greatest extent feasible. Any proposed removal of heritage trees is subject to public hearing. 19. Upon discovering or unearthing any possible burial site as evidenced by human skeletal remains or artifacts, the person making such discovery shall immediately notify the County of Santa Clara Coroner and no further disturbance of the site may be made except as authorized by the County Coordinator of Indian Affairs. Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 13 of 15 This shall be accomplished to the satisfaction of the County Coroner's Office and the Planning Director, as may be necessary during the construction of the subdivision improvements or individual lot development. 20. The addresses for the two parcels shall be assigned and approved by the Town as required by the Santa Clara County Fire Department and in accordance with Town policies. 21. The new residences on Parcels A and B shown on the Tentative Map Conceptual Development Plan are conceptual only, and no approval of any residence is indicated by approval of the Tentative Map. Site development applications for the new residences shall be submitted to the Planning Department for review and approval. 22. The property owner shall grant an Open Space Easement to the Town as shown on the Tentative Map page C-1. No structures are permitted and no grading or fill shall be permitted. Native vegetation may be planted within the easement but no irrigation or sprinkler systems are permitted. The property owner shall provide legal description and plat exhibits that are prepared by a licensed land surveyor or a registered civil engineer and the Town shall prepare the grant document. All required documents shall be signed and notarized by the property owner and returned to the Town prior to recordation of the Final Map. 23. The applicant shall file a Notice of Intent to comply with the State's National Pollutant Discharge Elimination System General Permit for Storm Water Discharge associated with construction activity with the State Water Resources Control Board prior to recordation of the Final Map. 24. The applicant shall prepare, implement, and maintain Stormwater Pollution Prevention Plan and provide measures to minimize or eliminate pollutant discharges from construction activities, the parking areas, and landscaping area after construction. 25. Fire protection improvements, including installation of any required hydrants, shall be constructed as requested by Santa Clara County Fire Department. Improvements shall be constructed and ready for use prior to the recordation of the Final Map, or shall be bonded for. Driveway access to each parcel shall be installed prior to commencement of any construction on that lot. 26. Plans for new residences shall be reviewed and approved by the Santa Clara County Fire Department at the time of site development permit application. Conditions that may be applied at that time include, but are not limited to, providing an acceptable water supply based on the size of the new residences, Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 14 of 15 providing an emergency vehicle turnaround, placement of property address signs that are clearly visible from Altamont Road, and providing an approved access system if the lots are fenced and gated. Planning Commission Lands of Joan K. Moeller Trust January 4, 2007 Page 15 of 15 ATTACHMENT 2 RECOMMENDED FINDINGS FOR THE TWO LOT SUBDIVISION OF A 2.91 -ACRE PARCEL LANDS OF JOAN K. MOELLER TRUST, 11990 PAGE MILL ROAD FILE #132 -06 -IS -ND -TM -GD 1. The subdivision as proposed would create two lots: Parcel A would be 1.209 acres in size, with a Lot Unit Factor of 1.079; Parcel B would be 1.448 acres in size, with a Lot Unit Factor of 1.503. Each parcel would provide a viable building site. In this and all other respects, the lots conform to the Los Altos Hills Subdivision Ordinance. 2. The proposed subdivision would create two lots that would meet the General Plan guidelines for land with an average slope between 10 and 30 percent, and in all other respects will be consistent with the General Plan. 3. Access to the proposed lots will be provided from Central Drive, a private road. Adequate services including water, gas and electric, telephone, fire protection and police protection are available to serve the subdivision as described in the staff report and the Mitigated Negative Declaration for the project. Future development on the two parcels will require extension of the sewer system and connection of each parcel. 4. All lots as proposed on the Tentative Map are physically suitable for the proposed future development. The Town Geotechnical Consultant has indicated that stated concerns can be addressed by adherence to the Project Geotechnical Report and conditions of approval for the project. It has been determined that each of the proposed lots contains a suitable building site, and that the proposed density is consistent with the General Plan. 5. All potentially significant environmental effects can be reduced to a level of insignificance as mitigated in the attached Mitigated Negative Declaration. The design of the subdivision and the proposed improvements are not likely to cause substantial environmental damage or to substantially and unavoidably injure fish or wildlife or their habitat. 6. The Town Engineer has reviewed the project and has determined that the design of the subdivision and the improvements will not conflict with easements, acquired by the public at large, for access through or use of the property within the proposed subdivision. ATTACHMENT 3 Town of Los Altos Hills 26379 Fremont Road Los Altos Hills, CA 94022 INITIAL STUDY In accordance with the policies regarding implementation of the California Environmental Quality Act of 1970, this document, combined with the attached supporting data, constitutes the initial study on the subject project. This initial study provides the basis for the determination of whether the project may have a significant effect on the environment. If it is determined that the project may have a significant effect on the environment, an environmental impact report will be prepared which focuses on the areas of concern identified by this initial study. If it is determined that the project would not have a significant effect on the environment, it is eligible for a Negative Declaration. If it is determined that the proposed project could have a significant effect on the environment, however, the significant effects of the project have been reduced to a less -than -significant level because revisions in the project have been made by or agreed to by the project applicant, then the project would be eligible for a Mitigated Negative Declaration. L Project Title: Lands of Moeller Subdivision (2 Lot) (File # 132 -06 -TM -ND -GD) 2. Lead Agency Name and Address: Town of Los Altos Hills 26379 Fremont Road Los Altos Hills, California 94022 3. Contact Person and Phone Number: Debbie Pedro, AICP, Planning Director (650) 941-7222 Initial Study prepared by: Brian Froelich, AICP, Assistant Planner 4. Project Location: 11990 Page Mill Road, Los Altos Hills, CA 94022 APN#182-28-006 5. Project Sponsor's Name and Address: Ralph Kraetsch 88 Karen Lane Walnut Geek, CA 94598 6. General Plan Designation: R (v -1) -Residential low to very low density 7. Zoning: R -A (Residential -Agricultural) 8. Description of Project: Proposed two lot subdivision of 2.91 net acres to create two new single family residential properties. Parcel A: 1.21 acres; Parcel B: 1.44 acres (net areage after right-of-way dedication). The existing parcel is developed with a one story residence, secondary dwelling unit, barn, and several accessory structures. The existing driveway approach is off of Page Mill Road. Access to the new lots will be from Central Drive. Both lots will have sanitary sewer line service. Water service will be provided by Purissima Hills Water District. All existing and new power and utility lines will be placed underground. 9. Surrounding Land Uses and Setting: The project is located at the northeast corner Page Mill Road and Central Drive. The subject parcel is bounded by Page Mill Road to the north and west, Central Drive to the south, and a residential property to the east. Surrounding land use includes single family residence with minimum lot size of ] acre. Palo Alto's Foothills Park is located across Page Mill Road to the west. 10. Other public agencies whose approval is required: Santa Clara County Fire Department ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED: I find that the proposed project COULD NOT have a significant effect on the environment, and a NEGATIVE 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. ❑ Aesthetics Agriculture Resources ❑ Air Quality ZBiological I❑7t Resources Q Cultural Resources 0 Geology /Soils ❑ Hazards & Hazardous 0 Hydrology / Water Quality ❑ Land Use / Planning Materials ❑ Mineral Resources ❑ Noise ❑ Population / Housing ❑ Public Services ❑ Recreation ❑ Tramportation/Traffic ❑ Utilities / Service Systems ❑ Mandatory Findings of Significance This Initial study has been prepared in accordance with the California Environmental Quality Act. Information and conclusions in the Initial Study are based upon staff research and the Town's General Plan and Municipal Code. On the basis of this initial evaluation: I find that the proposed project COULD NOT have a significant effect on the environment, and a NEGATIVE ❑ DECLARATION will be prepared. I find that although the proposed project could have a significant effect on the environment, there will not be a significant effect in this one because the mitigation measures described on an attached sheet have been added to the project. A 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 significant effect(s) on the environment, but at least one effect I) 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, if the effect is a "potentially significant impact" or " potentially significant unless mitigated." An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the effects that remain in be addressed. 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 all potentially significant effects (a) have been analyzed adequately ❑ in an earlier EIR pursuant to applicable standards and (b) have been avoided or mitigated pursuant to that earlier EIR, including revisions or mitigation measures that are imposed upon the proposed project. Signature: �i �--. Date: December 15, 2006 Debbie Pedro, AICP, Planning Director Initial Study Checklist Potentially Significant Less Than Less Than Significant with Significant No Impact m Mitigation IncorporationImpart L AESTHETICS -- Would the project: c a) Have a substantial adverse effectTscemc ❑ ❑❑Q sta?b) Substantiallydamage scenic resluding,but ❑ ❑❑historic not limited to, trees, rock outcrd buildings within a state scey?c) Substantially degrade the existin❑ ❑❑character or quality of the site and dings? d) Create a new source of substantial light or glare ❑ ❑ ❑ which would adversely affect day or nighttime views in the area? Sources: on: Aesthetic impacts are expected to be minimal when new residences are built on the 1,2,5,20 els. Al the time of any proposed development, the projects will be evaluated on its impacts such as structure height, size, setbacks, grading, fencing, Vee preservation, ing and general design. Furthermore, the Town has established standards for screening and Fandgeneral and all new residential dwelling projects and their associated landscaping and lighting reviewed at noticed public hearings.s Hills General Plan notes "important vistas" and "historic sites"inthe Open Space of the General Plan. None of these resources listed in the General Plan will benegatively im acted b the ro sal. 11. AGRICULTURE RESOURCES: In determining whether impacts to agricultural resources are significant environmental effects, lead agencies may refer to the California Agricultural Land Evaluation and Site Assessment Model (1997) prepared by the California Dept. of Conservation as an optional model to use in assessing impacts on agriculture and farmland. Would the project: a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the LJ ❑ LlFarmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? b) Conflict with existing zoning for agricultural use, ❑ ❑ ❑ Z or a Williamson Act contract? e) Involve other changes in the existing environment which, due to their location or nature, ❑ ❑ ❑ 0 could result in conversion of Farmland, to non- agricultural use? Sources: 8 Conclusion: The proposed subdivision will have no foreseeable impact on Agricultural Resomces. The site is not and has not been used as agricultural land. III. AIR QUALITY -- Where available, the significance criteria established by the applicable air quality management or air pollution control district may be relied upon to make the following determinations. Would the project: a) Conflict with or obstruct implementation of the ❑ ❑ ❑ applicable air quality plan? b) Violate any air quality standard or contribute ❑ ❑ ❑ Q✓ substantially to an existing or projected air quality violation? c) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non -attainment under an applicable ❑ Ll LJfederal or state ambient air quality standard (including releasing emissions which exceed quantitative thresholds for ozone precursors)? d) Expose sensitive receptors to substantial Ll L3 L)pollutant concentrations? e) Create objectionable odors affecting a substantial ❑ ❑ ❑ number of people? Sources: 9 Conclusion: Santa Clara County is currently a non -attainment basin for ozone thresholds but achieves an attainment level for carbon monoxide emissions. The increase of one developable property does not constitute a "considerable cumulative impact". IV. BIOLOGICAL RESOURCES -- Would the project: a) Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status ❑ ❑ Lispecies 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 other sensitive natural community ❑ ❑ Z identified in local or regional plans, policies, ❑ regulations or by the California Department of Fish and Game or US Fish and Wildlife Service? c) Have a substantial adverse effect on federally protected wetlands as defined by Section 404 of the Clean Water Act (including, but not limited to, ❑ Ll Llmarsh, venial pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? d) 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? e) Conflict with any local policies or ordinances ❑ ❑ protecting biological resources, such as a tree ❑ preservation policy or ordinance? f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community ❑ Ll Li 10 Plan, or other approved local, regional, or state habitat conservation plan? IMPACT: Sources: The site contains a number of heritage oak trees. Pursuant to Sections 12-2.302 and 12-2.502 of 1,6,10 the Los Altos Hills Municipal Coda;, the property owner shall seek to preserve and protect existing trees, especially heritage oaks and subdivision lot design and development plans shall accommodate existing trees whenever possible. No beritage oak tree is proposed to be removed as part of this subdivision. If any heritage oak trees are proposed to be removed at the time of site development, a notice public hearing and approval from the Town's Planning Commission will he required and the project applicant will be required to mitigate the loss of the heritage oak trees. MITIGATION: Significant trees, as identified by the Planning Department, shall be fenced at the dripline throughout all phases of grading and construction of subdivision improvements and individual residences and related improvements. V. CULTURAL RESOURCES — Would the project: a) Cause a substantial adverse change in the defined in Ll Ll Ll of a historical resource as '15064.5? b) Cause a substantial adverse change in the Ll Ll Ll of an archaeological resource pursuant to'15064.5? c) Directly or indirectly destroy a unique ❑ ❑ ❑ 0 paleontological resource or site or unique geologic feature? d) Disturb any human remains, including those ❑ ❑ Lointerred outside of formal cemeteries? IMPACT: The proposed subdivision and anticipated residential development will have no foreseeable impact on Cultural Resources as defined in Title 14; Chapter 3; Article 5; Section 15064.5 of the California Environmental Quality Act. No listed historical buildings are located in the vicinity (within 500') of the proposed site and no known archeological resources exist on die subject property. However, if any artifacts or human remains are discovered during any future grading or construction onsite, work in the vicinity of the find shall stop immediately until a qualified archaeologist can evaluate the site and determine the significance of the find per the mitigation measure described below. MITIGATION: Sources: Conditions of project approval require that upon discovering or unearthing any possible burial site 3,5,19 as evidenced by human skeletal remains or artifacts, the person making such discovery shall immediately notify the County of Santa Clara Coroner and no further disturbance of the site maybe made except as authorized by the County Coordinator of Indian Affairs. VI. GEOLOGY AND SOILS -- Would the project: a) Expose people or structures to potential ❑ ❑ ❑ substantial adverse effects, including the risk of ❑ loss, injury, or death involving: i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the Stale ❑ ❑ ❑ Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. ii) Strong seismic ground shaking? ❑ ❑ ❑ iii) Seismic -related ground failure, including ❑ Ll Llliquefaction? iv) Landslides? ❑ ❑ ❑ 0 b) Result in substantial soil erosion or the loss of Ll ❑ LJI'7 IJf topsoil? c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result ❑ ❑ Q ❑ of the project, and potentially result in on- or off- site landslide, lateral spreading, subsidence, liquefaction or collapse? d) Be located on expansive soil, as defined in Table ❑ ❑ I8 -1-B of the Uniform Building Code (1994), ❑ creating substantial risks to life or property? e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water L3 L3 Ll systems where sewers are not available for the disposal of waste water? IMPACT: Sources: According to the geotechnical investigations prepared by Earth Investigations Consultants dated 12,16,17 July 6, 2006 and October 6, 2006, potential geological hazards on the property includes seismic ground shaking in the event of an earthquake, minor creep of surficial soils, existing artificial fill materials not meeting modem placement standards, shallow subsurface seepage conditions, and moderately to highly expansive surficial materials. Based on the preliminary site fault exploration program, the Project Engineering Geologist has concluded that there is a low risk of surface fault rupture within the proposed building envelopes. MITIGATION: Proposed residential development will be subject to additional, more design specific geotechnical evaluation as follows: Detailed Geotechnical Investigations — Prior to approval of site development applications on individual lots, detailed design -level geotechnical engineering investigations should be completed for proposed project improvements (with ASTM approved borings). Appropriate subsurface investigations should be completed to characterize the distribution and engineering index properties of site earth materials (existing fill materials, colluvium, alluvium, bedrock, etc.). Recommended geotechnical design parameters should be prepared for proposed improvements. The following items will be specifically addressed during site investigations: a) The plan view distribution and depth of existing fills (or other deleterious materials to be removed/reworked during site grading) should be characterized and illustrated in plan view and cross section b) Detailed geotechnical design criteria should be prepared for any proposed basements with emphasis on mifigation of subsurface seepage. C) Areas of previous exploratory trench excavation should be delineated and identified for removal and recompaction of loose backfill materials. d) Consideration should be given to extending all house foundation piers to acbieve embedment into underlying bedrock materials. e) Anticipated seismic ground shaking conditions should be characterized considering the close proximity of the Bermeal fault. Appropriate Uniform Building Code seismic design parameters should be provided. VII. HAZARDS AND HAZARDOUS MATERIALS Would the project: a) Create a significant hazard to the public or the ❑ ❑ ❑ environment through the routine transport, use, or disposal of hazardous materials? b) Create a significant hazard to the public or the environment through reasonably foreseeable upset ❑ ❑ ❑ and accident conditions involving the release of hazardous materials into the environment? hazardous emissions or handle hazardous or hazardous materials, substances, or waste ❑ ❑ ❑ ne-quarter mile of an existing or proposed cated on a site which is included on a list of Fona us materials sites compiled pursuant mment ❑ ❑ ❑t Code Section 65962.5 and, as a result, create a significant hazard to the public or ironment? e) For a project located within an airport land use plan or, 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 in hazard ❑ L3 Llairstrip, would the project result a safety for people residing or working in the project area? g) Impair implementation of or physically interfere ❑ ❑ ❑ with an adopted emergency response plan or emergency evacuation plan? h) Expose people or structures to a significant risk of loss, injury or death involving wildland fires, including where wildlands are adjacent to urbanized U ❑ L Q areas or where residences are intermixed with wildlands? Sources: Conclusion: The proposed subdivision and anticipated residential development does not produce a 13 hazard or hazardous waste and will have no foreseeable impact related to Hazards and Hazardous Materials. The site is not located in an identified location according to CA Government Code 65962.5. VIII. HYDROLOGY AND WATER QUALITY -- Would the project: a) Violate any water quality standards or waste L) Lldischarge Ll requirements? b) Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a lowering of the local groundwater table LJ Ll Ll 1-7f Z 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 patrem of the site or area, including through the alteration of the course of a stream or river, in a manner which L) ❑ Q would result in substantial erosion or siltation on- or off-site? d) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, or substantially ❑ ❑ Z Ll 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 capacity of existing or planned 1-7f IJ Li 0 stormwater drainage systems or provide substantial additional sources of polluted runoff? 0 Otherwise substantially degrade water quality? ❑ ❑ Ll 0 g) Place housing within a 100 -year flood hazard area as 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 ❑ Ll 0 structures which would impede or redirect flood ❑ flows? people or structures to a significant risk of including ❑ ❑ ❑ ury or death involving flooding, as a result of the failure of a levee or dam? Fe ation by seiche, tsunami, or mudflow? ❑ ❑ ❑ T: 11,13,14 The proposed subdivision and anticipated residential development will have no immitigable impact on Hydrology and Water Quality as defined above. Both parcels naturally drain in a northeast direction. The Conceptual plans show that retention systems will be incorporated in the drainage design. MITIGATION: The Town Engineer will require a final, detailed drainage improvement plan to be submitted for review prior to approval of the Final Map. The drainage improvements must be designed to mitigate drainage impacts based on 100 year storm flow calculations. While surface runoff may increase due to the proposed site development, the proposed drainage improvements will mitigate storm water runoff offsite to a less than significant impact. IX. LAND USE AND PLANNING - Would the project: a) Physically divide an established community? ❑ ❑ ❑ b) Conflict with any applicable land use plan, policy, or 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 natural community conservation plan? Conclusion: The proposed subdivision and anticipated residential development will not physically Sources: 4,5,6 divide a community. The project complies with the Los Altos Hills General Plan and Subdivision Code. The project is not located in an area denoted as Open Space Conservation Area on the General Plan Map. X. MINERAL RESOURCES -- Would the project: a) Result in the lass of availability of a known ❑ ❑ ❑ mineral resource that would be of value to the region and the residents of the state? b) Result in the loss of availability of a locally- important mineral resource recovery site delineated ❑ ❑ ❑ on a local general plan, specific plan or other land use plan? Sources: Conclusion: The proposed subdivision and anticipated residential development will not result in a 5,6 loss of mineral resources. The project is not located in an area known for valued minerals. XI. NOISE Would the project result in: a) Exposure of persons to or generation of noise levels in 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 ❑❑ ❑ goundbome vibration or groundborne noise levels? c) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? d) A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use LJ LJ L)1 -7t IJ airport, would the project expose people residing or working in the project area to excessive noise levels? f) For a project within the vicinity of a private airstrip, would the project expose people residing or LJ LJ Llworking 10 in the project area to excessive noise levels? Sources: 6 Conclusion: The proposed subdivision and anticipated residential development will have no increased, permanent negative impact on noise standards. Interim construction external noise levels associated with subdivision improvements and future site development will periodically exceed 60dB(A) but can be held to less than significant by adherence to Town standards for hours of construction. Once development is complete, a minimal increase in the existing noise level that is typical of residential uses will occur. No significant noise impacts are anticipated. XII. POPULATION AND HOUSING .. Would the project: a) Induce substantial population growth in an area, either directly (for example, by proposing new LJ Ll Llhomes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? b) Displace substantial numbers of existing housing, necessitating the construction of replacement ❑ ❑ U 0 housing elsewhere? c) Displace substantial numbers of people, necessitating the construction ofreplacement U ❑ ❑ housing elsewhere? Sources: Conclusion: The proposed subdivision and anticipated residential development will not have a 2,3 foreseeable impact on population or housing. XIII. PUBLIC SERVICES a) Would the project result in substantial adverse physical 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 maintain acceptable service ratios, response times or other performance objectives for any of the public services: otection? ❑ ❑ ❑ protection? ❑ ❑ ❑ ls? ❑ ❑ ❑ z ❑ ❑ ❑ public facilities? rand ❑ ❑ ❑ Sources: usion: The proposed subdivision and anticipated residential development will not have a eable impact on any public service or facility. 1,2.3 ECREATION -- Would the project: uld the project increase the use of existing orhood and regional parks or other tional facilities such that substantial physical ❑ ❑ ❑ deterioration of the facility would occur or be accelerated? b) Does the project include recreational facilities or require the construction or expansion of recreational facilities which might have an adverse physical ❑ ❑ ❑ effect on the environment? Conclusion: The proposed subdivision and anticipated residential development will not have a foreseeable impact on recreation facilities. The Town's Parks and Recreation Department will collect an in lieu fee if the project is approved. Sources: 1,2,3 XV. TRANSPORTATION/TRAFFIC -- Would the project: a) Cause an increase in traffic which is substantial in relation to the existing traffic load and capacity of the street system (i.e., result in a substantial in either the number of vehicle trips, the ❑ Ll L3 volume to capacity ratio on roads, or congestion at intersections)? b) Exceed, either individually or cumulatively, a level of service standard established by the county congestion management agency for designated ❑ ❑ ❑ roads or highways? c) Result in a change in air traffic patterns, including either an 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., sharp curves or dangerous ❑ ❑ ❑ intersections) or incompatible uses (e.g., farm equipment)? e) Result in inadequate emergency access? ❑ ❑ ❑ 0 0 Result in inadequate parking capacity? ❑ ❑ ❑ 0 g) Conflict with adopted policies, plans, or ❑ ❑ ❑ �-7( Q programs supporting alternative transportation (e.g., bus turnouts, bicycle racks)? Sources: Conclusion: The subdivision will allow one additional new dwelling and thereby generate an 1'2'3'5 additional 10-12 vehicle trips per day. The minor increase in traffic is not anticipated to create traffic congestion on existing local roadways. The property owner is required to dedicate a 30 -foot half -street right-of-way over Page Mill Road and Central Drive to meet Town standards. XVI. UTILITIES AND SERVICE SYSTEMS Would the project: a) Exceed wastewater treatment requirements of the ❑ ❑ ❑ applicable Regional Water Quality Control Board? b) Require or result in the construction of new water or 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 drainage facilities or expansion of existing Ll LJ Llfacilities, the construction of which could cause significant environmental effects? d) Have sufficient water supplies available to serve ❑ ❑ ❑ Q the project from existing entitlements and resources, or are new or expanded entitlements needed? e) Result in a determination by the wastewater treatment provider which serves or may serve the ❑ ❑ 0 project that it has adequate capacity to serve the ❑ project's projected demand in addition to the provider's existing commitments? t) Be served by a landfill with sufficient permitted ❑ Ll LJ to accommodate the project's solid waste disposal needs? g) Comply with federal, state, and local statutes and ❑ ❑ ❑ 1-7f LJ regulations related to solid waste? Sources: 1,2,3,15 Conclusion: The proposed subdivision and anticipated residential development will not have a Water supply will be provided by Purissima Fulls foreseeable impact on utility and service systems. Water District. Both parcels will be connected to the sanitary sewer system. XVII. 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-sustainingZa, ❑ Ievels, 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 areindividually limited, but cumulatively considerable?("Cumulatively considerable" means that the❑incremental effects of a project are considerablewhen viewed in connection with the effects of pastprojects, the effects of other current projects,and the effects of probable future projects)?c) Does the project have environmental effects❑which will cause substantial adverse effects onhuman beings, either directly or indirectly? Sources: 1 - Conclusion: The proposed project, as mitigated, will ne impact ro the Theve any foreseeablecumulative 20environment, wildlife, plant or historical resource. or unmitigated impacts as defined in this In MITIGATION MEASURES INCLUDED IN THE PROJECT TO AVOID POTENTIALLY SIGNIFICANT EFFECTS: I. Supplemental geotechnical investigation reports shall be submitted for review and approval by the Town's getoechnical consultant at the time of site development review for the new residences with emphasis on foundation and other structural designs. The Town Geologist shall also review and approve the subdivision improvement plans prior to issuance of any building permits for construction of the improvements. 2. The on-site and off-site drainage improvement shall be designed as surface flow whenever possible to avoid concentration of runoff. The proposed drainage shall be designed to maintain the existing flow patterns. The applicant shall design and construct all subdivision drainage improvements as deemed necessary by the City Engineer. Storm drainage design shall be for the 100 year storm with one hour rainfall duration and shall include analysis of the existing downstream drainage channels and pipes that will receive drainage from the subdivision to determine if they have adequate capacity to safely accommodate the additional flows. All required drainage improvements including the earthen Swale along the east property line of Parcel B shall be constructed or bonded for prior to recordation of the Final Map. 3. Significant trees, as identified by the Planning Department, shall be fenced at the dripline throughout all phases of grading and construction of subdivision improvements and individual residences and related improvements. 4. If any archaeological artifacts or human remains are discovered during grading or construction, work in the vicinity of the find shall stop immediately until a qualified archaeologist can evaluate the site and determine the significance of the find. Project personnel shall not collect or alter cultural resources. Identified cultural resources shall be recorded on form DPR 422 (Archaeological Site) and/or form DPR 523 (Historic Resources). If human remains are found, the County Coroner shall be contacted immediately. Responsible Must Be Mitigation Measure Department Completed By: Done 1. Geotechnical Reports Engineering Site Development Review (Supplemental) Town Geologist 2. Drainage Improvement Plan Engineering Site Development Review 3. Protective Tree Fencing Planning Prior to Grading for Future Development 4. Archaeological Findings Planning Ongoing Source List: 1. Field Inspection 2. Project Plans 3. Planner's Knowledge of the Area 4. Los Altos Hills Land Use and Zoning Map 5. Los Altos Hills General Plan 6. Los Altos Hills Municipal Code 7. Assessor's Maps, Office of County Assessor, Santa Clara County, 2004-2005 8. State Department of Conservation, Farmland Mapping and Monitoring Program 9. BAAQMD CEQA Guidelines: Assessing the Air Quality Impacts of Projects and Plans, December 1999 10. State Department Fish and Games Natural Diversity Database Map 11. Santa Clara Valley Water District Map 12. Geotechnical and Seismic Hazard Zones Map of Los Altos Hills, Cotton Shires and Associates, Dec -2004 13. DTSC Hazardous Waste and Substance Sites List, California Environmental Protection Agency 14. Federal Emergency Management Agency, Flood Insurance Rate Map, Los Altos Hills, January 2, 1980 15. Sanitary Sewer Map, Town of Los Altos Hills Engineering Department 16. Santa Clara County Municipal Code Chapter II Indian Burial Grounds (Title B Division B-6) 17. Earth Investigations Soil Report October 6, 2006 18. Cotton & Shires Assoc. Peer Review Letter August 29, 2006 19, CEQA Guidelines, 2005 20. Google Earth Exhibit List: 1. Photos of the site and surrounding areas 2. Aerial photo of the site and surrounding areas 3. Project plans TOWN OF LOS ALTOS HILLS NEGATIVE DECLARATION PROJECT TITLE: Lands of Moeller Subdivision (2 Lot) PREPARED BY: Brian Froelich, AICP, Associate Planner NAME AND ADDRESS OF PROJECT SPONSOR: Ralph Kraetsch 88 Karen Lane Walnut Creek, CA 94598 LOCATION OF PROJECT: 11990 Page Mill Road, Los Altos Hills, CA 94022 APN#182-28-006 PROJECT DESCRIPTION: Proposed two lot subdivision of 2.91 net acres to create two new single family residential properties. Parcel A: 1.21 acres; Parcel B: 1.44 acres (net acreage after right-of-way dedication). The existing parcel is developed with a one story residence, secondary dwelling unit, bam, and several accessory structures. The existing driveway approach is off of Page All Road. Access to the new lots will be from Central Drive. Both lots will have sanitary sewer line service. Water service will be provided by Purissima Hills Water District. All existing and new power and utility lines will be placed underground. FINDING: The Town of Los Altos Hills has completed a review of the proposed project, and on the basis of the attached Initial Study, has determined that the project, as mitigated, will reduce impacts to a less than significant level. MITIGATION MEASURES INCLUDED IN THE PROJECT TO AVOID POTENTIALLY SIGNICIANT EFFECTS: 1. Supplemental geotechnical investigation reports shall be submitted for review and approval by the Town's getoechnical consultant at the time of site development review for the new residences with emphasis on foundation and other structural designs. The Town Geologist shall also review and approve the subdivision improvement plans prior to issuance of any building permits for construction of the improvements. 2. The on-site and off-site drainage improvement shall be designed as surface flow whenever possible to avoid concentration of runoff. The proposed drainage shall be designed to maintain the existing flow patterns. The applicant shall design and construct all subdivision drainage improvements as deemed necessary by the City Engineer. Storm drainage design shall be for the 100 year storm with one hour rainfall duration and shall include analysis of the existing downstream drainage channels and pipes that will receive drainage from the subdivision to determine if they have adequate capacity to safely accommodate the additional flows. All required drainage improvements including the earthen Swale along the east property line of Parcel B shall be constructed or bonded for prior to recordation of the Final Map. 3. Significant trees, as identified by the Planning Department, shall be fenced at the dripline throughout all phases of grading and construction of subdivision improvements and individual residences and related improvements. 4. If any archaeological artifacts or human remains are discovered during grading or construction, work in the vicinity of the find shall stop immediately until a qualified archaeologist can evaluate the site and determine the significance of the find. Project personnel shall not collect or alter cultural resources. Identified cultural resources shall be recorded on form DPR 422 (Archaeological Site) and/or form DPR 523 (Historic Resources). If human remains are found, the County Coroner shall be contacted immediately. Debbie Pedro, AICP, Planning Director Date TOWN OF LOS ALTOS HILLS Circulated on, December 15, 2006 Adopted W COTTON, SHIRES & ASSOCIATES, INC. ATTACHMENT ENT y CONSULTING ENGINEERS AND GEOLOGISTS November 15, 2006 L0136A TO: Debbie Pedro Planner RECEIVED TOWN OF LOS ALTOS HILLS 26379 Fremont Road Los Altos Hills, CA 94022 NOV 2 5 2006 SUBJECT: Supplemental Geotechnical Peer Review TOWN OF LOS ALTOS HILLS RE: Moeller, Two -Lot Subdivision 132 -06 -GD -IS -ND -TM 11990 Page Mill Road At your request, we have completed a supplemental geotechnical peer review of the subject permit application for the proposed two -lot subdivision using: • Preliminary Soil Report — Proposed 2 -Lot Residential Subdivision prepared by Earth Investigations Consultants, dated October 6, 2006; • Engineering Geologic Feasibility Study (report) prepared by Earth Investigations Consultants, dated July 6; 2006; and - • Tentative Parcel Map and Civil Plans (5 sheets, 30- and 80 -scale) prepared by Lea and Braze Engineering, Inc., dated July 17, 2006. In addition, we have reviewed pertinent technical documents from our office files DISCUSSION The applicant proposes to subdivide the subject property of approximately 2.8 acres into two lots for future single-family residential development. Currently, access to the property is via a private driveway off of Page Mill Road in the western portion of the property. In our previous review report (dated August 29, 2006), we concluded that site fault investigation had been satisfactorily completed. We recommended that a preliminary site geotechnical investigation be completed prior to approval of the Tentative Parcel Map. CONCLUSIONS AND RECOMMENDED ACTION Proposed site development is constrained by anticipated very strong seismic ground shaking, minorcreep of surficial soils, existing artificial fill materials not NoMhem Califom5a Office 330 Village lane Los Gatos, CA 95030-Td13 (408) 3545542 • Fax (403) 3541652 e-mail: losgat a@icoeonshires.Mm www.cottonshires.com cmhal Califamia offire 6419 Dogtow Road San Andreas, CA 95249-9640 (209) 7344252 • Fax (209) 9341212 e-mail: mttonsfiivcs@stazband.nef Debbie Pedro November 15, 2006 Page 2 L0136A meeting modem placement standards, shallow subsurface seepage conditions, and moderately to highly expansive surficial materials. Based on the previously completed site fault exploration program, the Project Engineering Geologist has concluded that the risk is low for the occurrence of surface fault rupture within the proposed building envelopes. The referenced Preliminary Soil Report adequately addresses the recommendations of our previous peer review. The Project Geotechnical Consultant (EIC) has pointed out a number of geotechnical items that should be addressed in greater detail during completion of design -level geotechnical investigations for individual houses and during preparation of detailed site development plans. For example, EIC notes that any planned basements would probably encounter profuse seepage warranting consideration of designing basement walls for undrained conditions (to avoid possible year-round pumping of wall backdrain systems). We note that if thorough water proofing measures are not entirely successful, then some level of dampness may be associated with basement construction at this site. In addition, EIC has recommended that existing site fill materials (up to 14 feet thick) should be removed, or reworked as engineered fills, in proposed development areas. We recommend geotechnical approval of the Tentative Parcel Map application with the following conditions: Detailed Geotechnical Investiate ions — Prior to approval of site development applications on individual lots, detailed design -level geotechnical engineering investigations should be completed for proposed project improvements (with ASTM approved borings). Appropriate subsurface investigations should be completed to characterize the distribution and engineering index properties of site earth materials (existing fill materials, colluvium, alluvium, bedrock, etc.). Recommended geotechnical design parameters should be prepared for proposed improvements. The following items should be specifically addressed during site investigations: a) The plan view distribution and depth of existing fills (or other deleterious materials to be removed/reworked during site grading) should be characterized and illustrated in plan view and cross section. b) Detailed geotechnical design criteria should be prepared for any proposed basements with emphasis on mitigation of subsurface seepage. COTTON, SHIRES & ASSOCIATES, INC. Debbie Pedro Page 3 November 15, 2006 L0136A C) Areas of previous exploratory trench excavation should be delineated and identified for removal and recompaction of loose backfill materials. d) Consideration should be given to extending all house foundation piers to achieve embedment into underlying bedrock materials. e) Anticipated seismic ground shaking conditions should be characterized considering the close proximity of the Berrocal fault. Appropriate Uniform Building Code seismic design parameters should be provided. Appropriate documentation to address the above should be submitted to the Town for review by the Town Engineer and Town Geotechnical Consultant prior to approval of site development applications for individual lots. LIMITATIONS This geotechnical peer review has been performed to provide technical advice to assist the Town with discretionary permit decisions. Our services have been limited to review of the documents previously identified, and a visual review of the property. Our opinions and conclusions are made in accordance with generally accepted principles and practices of the geotechnical profession. This warranty is in lieu of all other warranties, either expressed or implied. TS:DTS:kd Respectfully submitted, COTTON, SHIRES AND ASSOCIATES, INC. TOWN GEOTECHNICAL CONSULTANT Ted Sayre Associate Engineering Geologist CEG 1795 171955 . , ^ David T. Schrier Associate Geotechnical Engineer GE 2334 COTTON, SHIRES & ASSOCIATES, INC. FIRE DEPARTMENT SANTA CLARA COUNTY 14700 Winchester Blvd., Los Gatos, CA 95032-1818 (408) 378-4010 - (408) 378-9342 (fax) •—.-cfd.org ATTACHMENT 5 PLAN NEvim NUMBER 06 BLDG.....um-EN DEVELOPMENT REVIEW COMMENTS TRE NUMBER3-3 GODSPEED. I MEET I NO.I NEOUPEMENT of tentative parcel map for a two lot subdivision. fire department conditions or requirements. m,e,nm�mullV A�emaea Agenry IS -ND -TM ON, PIANS SPECS NFA' RMM AS OCILPANCV CONST. TVPE AWlnnmamaDATE PAGE LAH ❑ El 1-1❑ ❑ LEA & BRAZE ENGINEERS 8/2/2006 1 OF 1 SECIFLOOP AflFA LOPO OESCPIPIION SV Residential Development Rucker, Ryan NAME OF PROJECT LOCATION SFR- MOELLER 11990 Page Mill Rd as the Santa Clara County Central Fire Protection District Seruin9 Santa Clam County and the oto Sereno, Mo omPHfll, an�Stinc, Los Altos, Los Altos HUS, Los Gatos, rgan ga ATTACHMENT (a Pack Gas and Electric Company` Corporate Real Estate 111 Almaden Blvd., Rm. 614 Land services San Jose, CA 95115 Mailing Address ID. Bos 15005 San Jose, CA 951150005 August 1, 2006 Planning Commission Town of Los Altos Hills 26379 Fremont Road Los Altos Hills, CA 94022 RE: Tentative Parcel Map and Diagrams (Dated July 2006) 11990 Page Mill Road, Los Altos Hiiis PG&E file: Y06 -MR -41 Dear Planning Commission: Thank you for the opportunity to review the Tentative Parcel Map and diagrams on the above referenced property. PG&E has no objection to the maps or diagrams. PG&E owns and operates a variety of gas and electric facilities which may be located within the proposed project boundaries. Project proponents should coordinate with PG&E early in the development of their project plans to promote the safe and reliable maintenance and operation of existing utility facilities. Any proposed development plans should provide for unrestricted utility access and prevent interference with PG&E easements. Activities which may impact our facilities include, but are not limited to, permanent/temporary changes in grade over or under our facilities, construction of structures within or adjacent to PG&E's easements, and planting of certain types of vegetation over, under, or adjacent to our facilities. The installation of new gas and electric facilities and/or the relocation of existing PG&E facilities will be performed in accordance with common law or Rules and Tariffs as authorized by the California Public Utilities Commission. Please contact me at (408)282-7401 or DQTl@PGE.com if you have any questions regarding our comments. Sin�ely, Dad'g Tran Land Technician ATTACHMENT 7 Town Of Los Altos Hills December 19, 2006 Subdivision Committee Hearing Fact Sheet Project Description: Two Lot Subdivision File Number: 132 -06 -GD -IS -ND -TM Site Address: 11990 Page Mill Road Owner(s): Joan K. Moeller Trustee Staff Planner: Brian Froelich, AICP, Assistant Planner Site Data Net Lot Area: 2.91 acre Average Slope: 16.5% Lot Unit Factor: 2.33 PROPOSED DEVELOPMENT TABLE A 15 1.312 1.209 1.079 14,162 6,204 B '112' 1.448 1.503 21,700 8,905 Existing 16.5 3.13 2.91 2.33 Site* -Existing site data is calculated prior to proposed right-of-way dedications Grading: None Sewer/Septic: Force main sewer connection to Palo Alto Basin. Environmental Design Committee Comments: Proposed buildings should be sited away from the large heritage trees on site. Pathway Committee Comments: Construct II -B path along the Page Mill Road frontage, separated by 5 feet from roadway; to meander around trees, obstacles as necessary. No path required along Central Drive. Fire Department Comments: None Geotechnical Comments: Recommends approval with conditions. Utility Company Comments: None Lands of Moeller 11990 Page Mill Road December 19, 2006 Page 2 of 2 ATTACHMENT 8 Town Of Los Altos Hills December 19, 2006 Subdivision Committee Hearing Report Attendance: Debbie Pedro, Brian Froelich, John Harpootlian, Jeff Lea, Frank Dietrich, Pat Ley (EDC) Environmental Design Committee Comments: Would like to see trees on site preserved. Commissioner Harpootlian Comments: Would like to see septic system and well abandonment details on the plans. Neighbor Comments: Frank Dietrich, 12541 Zappettini Court described a drainage issue in the neighborhood. Mr. Dietrich would like the Town or the project applicant to address and correct the neighborhood drainage issue. Conditions of Approval Added: Require detailed plans for well abandonment and septic system demolition with the subdivision improvement plans. The applicant shall obtain permits from the Santa Clara County Health Department and Santa Clara Valley Water District for the septic demolition and well abandonment. Z / (S / 06 Director Uate ATTACHMENT 9 Subdivision Evaluation Environmental Design and Protection Committee Date: Grading: Creeks, drainage, easements: Existing Vegetation: / /J, "/ 'S .0 z Significant issu comments: ATTACHMENT /0 PWC Meeting September 25, 2006 2366 Priscilla Lane (Lands of Hyver). The reason for pathway review is construction of a new residence; Mr. Bob Owen, builder, was present representing the owners of 12366 Priscilla Lane. The property is located on a flag lot and a pathway easement already exists on the opposite side of Priscilla Lane. Neither Priscilla Lane nor the property under review connects to an off-road pathway. Nick Dunckel moved that the PWC recommend an in lieu fee be collected for 12366 Priscilla Lane because Priscilla does not connect to off-road pathways and because a pathway easement already exists on the opposite side of the road. Ann Duwe seconded; the motion carried unanimously. PWC Meeting August 28, 2006 i. 14414 Liddicoat Circle (Lands of Kuppalli). The reason for pathway review is addition of a second story; the homeowners were present. The property is located on the inside of Liddicoat circle across from Yale Court and rises steeply up from the edge of the roadway. The PWC has previously determined that the opposite side of Liddicoat, which is flatter, is the preferred side for a roadside path and several segments are already in place. Courtenay Corrigan moved that the PWC recommend an in lieu fee be collected for 14414 Liddicoat Circle because Liddicoat does not connect to off-road pathways and the opposite side of the road is the preferred site for a pathway. Ann Duwe seconded; the vote was 10 in favor, 1 abstention. ii. 12060 Elise Way (Lands of Kwon). The reason for pathway review is construction of a new residence. Elise Way is a cul-de-sac that could serve six lots. Bill Silver moved that no on -road pathway be required at 12060 Elise Way and the Town collect an in lieu fee because this cul -se -sac serves less than 8 properties and does not connect to an off-road path. Anna Brunzell seconded; the vote was 10 in favor, 1 abstention. —� iii. 11990 Page Mill Road (Lands of Moeller). The reason for pathway review is two -lot subdivision. The lot is at the comer of Page Mill Road and Central Drive. A pathway exists in the right-of-way of Central Drive, which forms the southern border of the Moeller property. Subdvision is proposed along an east -west line across the property; access to the northern lot will be from Central via a driveway near the east border of the property. A small stream crosses under Page Mill Road at the north west corner of the property and runs east across the northern part of the property. Several drainage swales run near the eastern edge and connect to this stream. Ralph Kraetsch, a family member and executor of the Moelller estate was present and addressed the committee. He strongly prefers that a pathway be routed along Page Mill Road rather than along the eastern property line adjacent to 27961 Central Drive. He reported that the eastern border of the property was often wet in the winter months and that access up to Page Mill Road in this area is very steep. The committee discussed the pros and ^ons of various path routes; it was generally agreed that one pathway through the property, Aber along Page Mill Road or along the eastern edge is appropriate, but not pathways in both locations. A pathway also exists in the right-of-way of Central Drive, which forms the southern border of the Moeller property. Anna Brunzell moved that on the property at 11990 Page Mill Road, a IIB path be required along Page Mill Road and that the path be separated from the road by at least five feet. In the interest of privacy, no pathway is required along the property line adjacent to 27961 Central Drive. Chris Vargas seconded; the vote was 9 in favor, 2 opposed, 1 Sstention. iv. 11571 Buena Vista (Lands of Lizaur). The reason for pathway review is an addition. Buena Vista is a cul-de-sac that currently serves six properties. An off-road pathway (fire road) runs from Central Drive to Buena Vista along the western edge of the adjacent property (11641 Buena Vista); future subdivision of this property is likely. Chris Vargas moved that the Town request an in-road easement along Buena Vista for the purpose of providing public access. Anna Brunzell seconded; the vote was 10 in favor, 1 abstention. v. 25844 Springhill Drive (Lands of Askarinam). The reason for pathway review is construction of a new residence. The property is a flag lot bordering on Foothill Expressway. Springhill is a cul-de-sac that serves five houses. Although an informal local path connects to Saltamontes Road, no official off-road pathways connect to Springhill. Anna Brunzell moved that no on-road pathway be required at 25844 Springhill Drive and the Town collect an in lieu fee from the property owners because this cul-de-sac serves only five properties and does not have a connecting off-road path. Sue Welch seconded and the motion passed unanimously. Chris Vargas seconded, the vote was 10 in favor, 1 abstention. vi. 26063 Todd Lane (Lands of Klein). The reason for pathway review is construction of a new residence. Todd Lane is a private road and a cul-de-sac that has an off-road -athway that connects to Bullis School. The PWC previously determined that because of the ,opography the side of Todd Lane opposite 26063 is the preferred side for a roadside pathway. Because this private road is an important connecting route, the Committee considers it important to assure public access. Nancy Ginzton moved that because the flatter, south side of Todd Lane is the preferred side for a roadside pathway, no in lieu fee is required of the owners of 26063 Todd Lane. The Committee requests a 10-foot easement within the road right-of-way to assure public access to Todd Lane. Bill Silver seconded; the vote was 9 in favor, 1 opposed, 1 abstention. vii. 13880 Cicerone Lane (Lands of Winner). The reason for pathway review is an addition. This property is adjacent to Fremont Road and next to another property (13902 Campo Vista Lane) that is also under pathway review at this meeting (see below). A retaining wall, a concrete staircase, and a number of mature oaks are within the road right-of-way along the Fremont. Because Fremont Road carries a significant amount of traffic and the existing roadside pathways are heavily used the committee considers the roadside pathway here important. Bill Silver moved that the Committee require a safe IIB pathway on 13880 Cicerone Lane along the border with Fremont Road. Courtenay Corrigan seconded; the vote was 10 in favor, 1 abstention. viii. 13902 Campo Vista Lane (Lands of Creative Center of Los Altos). The reason for pathway review is a five-lot subdivision. Campo Vista is a narrow cul-de-sac; it is not know if this is a private road. Anna Brunzell moved that the Committee recommend the allowing for 13902 Campo Vista Lane: 1) a IIB path on the east side of Campo Vista Lane; 2) a IIB path on Fremont Road to be separated from the road for safety; 3) a 10-foot easement in Campo Vista Road right-of-way if Campo Vista is a private road. Bill Silver seconded; the vote LEA A BRAZE 9W EERIA INC. Awwww-& CIVIL ENGINEERS • LANO SURVEYORS 2495 Industrial Parkway West Hayward, California 94545 (510) 987-4096 Fax (510) 887-3019 WWW.LEABRAZE.COM ATTACHMENT II RECEIVED DEC 0 3 2006 November 7, 2006 TOWN OF LOS ALTOS HILLS Pathways Committee - Town of Los Altos Hills 26379 Fremont Rd. Los Altos Hills, CA 94022 Subject: Moeller Minor Subdivision — Page Mill and Central Job No. 2060241 To the Committee: As Engineer of Record for the proposed minor subdivision I wish to respectfully request that a pathway not be proposed or constructed along Page Mill Road because, primarily, of safety reasons. The area is on a blind curve with, in my experience, fast-moving traffic and a sense of "surprise" to pedestrians and presumably equestrians as traffic noise approaches. I urge the members of the committee to walk the frontage along Page Mill and assess the desirability of encouraging equestrian/vehicular proximity in that location. Even if the path were to be moved away from the roadway it would become very problematic to bring it back to the paved area at the end away form Central because of severe grade differential. Please contact me with any questions. Very truly yours, Jeffrey C. Lea Civil Engineer m Copy: John Chau, Assistant Engineer Brian Froelich, Assistant Planner 2495 Industrial Parkway West Hayward, CA 94545 — 510.887.4086 — Fax 510.887.3019