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Home My WebLink About3.3 ITEM 3.3 TOWN OF LOS ALTOS HILLS January 6, 2016 Staff Report to the Planning Commission SUBJECT: TENTATIVE PARCEL MAP FOR A TWO-LOT SUBDIVISION AND CONSIDERATION OF AN INITIAL STUDY AND MITIGATED NEGATIVE DECLARATION: LANDS OF GERA; 12345 GIGLI COURT; FILE#51-15-TM- IS-ND. FROM: Steve Padovan, Consultant Planner ge. APPROVED: Suzanne Avila, AICP, Planning Director S RECOMMENDATION That the Planning Commission: 1. Review the Initial Study, provide comments, and forward a recommendation, based on the Initial Study (Attachment 3), that the City Council adopt the Mitigated Negative Declaration and Mitigation Monitoring Program in Attachment 4 and forward a recommendation to the City Council for approval of the requested Tentative Parcel Map, based on the findings in Attachment 1 and the conditions of approval in Attachment 2; or 2. Review the Initial Study and proposed subdivision and continue the project pending a request for additional information on the geotechnical issues, slope stability, and/or freeway noise. 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 Parcel 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 no 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 1). Comments on the Tentative Parcel Map have been received from the following: • Town Geotechnical Consultant; • Town Engineer; • Santa Clara County Fire Department; Lands of Gera January 6,2016 Page 2 of 15 • Santa Clara County Department of Environmental Health; • Purissima Hills Water District; • Environmental Design and Protection Committee; • Open Space Committee; and • Pathways Committee. These comments are included in the staff report, and incorporated into the conditions of approval and/or the Initial Study as appropriate. Neighboring residents and property owners within 500 feet of the site have been notified of the public hearing. BACKGROUND The subject 2.85 gross acre parcel is designated as Lot 2 of Tract Map No. 6763, which was recorded on May 28, 1980. A note on the map states that Lot 2 is "Not further subdividable." In order to determine the origin of this note on the map, staff reviewed the geologic report and the responses from the Town's Geologist, William Cotton. In addition, staff obtained the minutes from the Planning Commission and City Council meetings related to the original approval of the map in 1977 (see reports and minutes in Attachment 5). In summary, the Planning Commission recommended a condition that Lots 2 and 4 not be further subdivided based on factors of ground slope and potential seismic rupture from the Monte Vista fault which runs through the lots. In addition, the Commission recommended that a sound study be required for new construction on Lots 3 and 4 based on traffic noise from I-280. The City Council concurred with the Planning Commission recommendation but amended the condition to include noise from I-280 as an additional reason not to allow further subdivision of Lots 2 and 4. The project site is located on the east side of Gigli Court at the top of the slope above Interstate 280. Surrounding land uses include one and two story single-family residences with a minimum lot size of one acre. The property contains a main residence and a second unit along with a pool, pool house, carport and related hardscape. The property is generally flat within 160 to 200 feet from the street and then slopes downward towards the freeway. Vegetation consists of a cluster of oaks behind the secondary unit and trees along the perimeter of the property with ornamental trees and bushes around the dwellings and non-native grasses on the remainder of the undeveloped portion of the lot. There is a mapped fault trace on the lot located near the street and the existing main residence is located within the fault trace setback zone. All new habitable structures will be set back a minimum of 25 feet from the fault trace. PROJECT DESCRIPTION The applicant is requesting approval of a subdivision of the 2.85 gross acre parcel into two lots of 1.42 net acres (Parcel A) and 1.40 net acres (Parcel B) with Lot Unit Factors (LUF) of 1.24 and 1.023 respectively. Access to parcels A and B will be provided directly off Gigli Court which is a public road. The lots will have separate septic systems (which have been tentatively approved by Santa Clara County Department of Environmental Health) and water service will be provided by the Purissima Hills Water District. The existing main residence on Parcel A, the pool, a large portion of the driveway, and all hardscape within the 30 foot side yard setback will Lands of Gera January 6,2016 Page 3 of 15 be removed prior to recordation of the map. The second unit will remain on Parcel B and be occupied by the owner until a new residence is constructed on Parcel A. All new power and utility lines within the subdivision will be placed underground. Existing Development Gross,4' Net Ave°Slope LUF NIDA , ' 'MFA- ... Acreage: ,Acreage,`, (%)„ (sq ft) s (sq ft) Existing 2.85 2.85 19.23 2.288 26,401 12,672 Site * Existing site data is calculated prior to proposed right-of-way dedications. Proposed Development Parcel Gross Net :Ave Slope LUF MDA :" °MFA = Acreage Acreage (%) -(sq ft), (sq ft), A 1.44 1.42 16.0 1.240 15,810 7,068 B 1.42 1.40 22.58 1.023 10,519 5,495 Lot Design and Building Sites The proposed lots meet all of the minimum requirements in the Town's Subdivision Ordinance with regard to the following: • Each lot is a minimum of one net acre; • Each lot has a minimum LUF of 1.0; • Each lot contains a 160-foot diameter building circle within the proposed parcel boundaries thereby indicating that the parcel contains a viable building site; • Each lot contains an area of at least one net acre within a 350-foot diameter circle that encompasses each parcel; • Each lot meets the minimum slope density requirement based on the proposed average slope of the lots (Parcel A requires 1.14 net acres; Parcel B requires 1.36 net acres) The Tentative Parcel Map also shows a conceptual site design, building footprints, driveways, septic fields, drainage installations, and easements for the fault trace, utilities and pathways. This development is conceptual only and shows that all parcels can be developed to meet Town standards. The two parcels contain building areas that are outside of the proposed fault zones, contain adequate yard setbacks, and are located on slopes under 20%. In order to meet the Town's Grading Policy, future home designs on Parcel A will likely need to be stepped down the hill to limit the amount of grading. Parcels A and B are highly visible from adjacent properties and from Interstate 280. Once the Parcel Map is recorded, individual site development applications will be submitted for each parcel and the site specific design of any future homes or other site development will be evaluated through the appropriate public review process where specific conditions will be made. Lands of Gera January 6,2016 Page 4 of 15 In addition, landscape screening will be required for each home site to soften the effect of the new construction. Access Access for Parcels A and B will be from the public street with each lot served by an individual driveway. No oaks or significant trees will be required to be removed for the construction of the future driveway on Parcel A. A portion of the existing driveway will be used for Parcel B. Utilities Water supply will be provided by the Purissima Hills Water District and PG&E will provide gas and electric services. All utilities are required to be placed underground. An encroachment permit must be obtained from the Public Works Department for all work performed within any public right-of-way. Geotechnical Review At the time of the original subdivision, both the Planning Commission and the City Council cited geotechnical concerns (slope stability and the known fault location) as a reason to restrict the subdivision potential of Lots 2 and 4. Lot 4 is significantly constrained by the fault, which runs through the middle of the parcel. However, the location of the fault on Lot 2 only impacts the area closest to Gigli Court, leaving a large portion of the lot available for development. The Town's Geotechnical Consultant, Cotton, Shires and Associates has reviewed the proposed Tentative Map and Geologic Reviews provided by the applicant (Murray Engineers, Inc. dated July 18, 2014 and June 9, 2015 and included as exhibits in the Initial Study) and pertinent documents and maps at their offices. Cotton, Shires and Associates reported that the Project Geotechnical Consultant has adequately characterized site conditions and recommended appropriate geotechnical design criteria for future residential development on the proposed parcels (Attachment 6). The fault trace that was mapped at the time of the original subdivision was confirmed based on trenching done on the adjacent parcel to the north (Lot 3 of Tract Map 6763) and the location of the fault zone as shown on the Tentative Parcel Map is accurate. Based on current construction standards, all new habitable structures must be a minimum of 25 feet from a mapped fault trace and the proposed map is providing a 40 foot setback (other uses such as tennis courts, pools, patios, etc. can be placed within fault setback zones). In addition, the project geotechnical consultant has recommended that a geotechnical subsurface exploration be performed in the septic leachfield area prior to recordation of the map to confirm anticipated shallow bedrock conditions. The Town Geologist concurs with that recommendation and it has been included in the Conditions of Approval (under Condition No. 2). Lands of Gera January 6, 2016 Page 5 of 15 Open Space Easement The General Plan Open Space and Recreation Element contains policies that encourage the preservation of open space on parcels within Open Space Conservation Areas that have slopes of 30% or more, contain heritage trees, or sensitive habitat areas. The area on the parcels designated for future development is on the upper half of the lots which currently contains two dwellings, a pool, driveways, decks and other hardscape. No trees are proposed for removal nor would any trees need to be removed to subdivide the property. However, the property is located directly adjacent to an Open Space Conservation Area as shown on the General Plan Land Use Map and the property between the freeway and the subject lot is vacant and in a more natural state. Furthermore, the lower portion of the subject property has heritage oak trees and is highly visible from the freeway and from properties on the west side of I-280. Based on these factors, the development of the lower portions of the lot may result in significant impacts to these natural resources. In order to mitigate this impact, staff has recommended that an open space/conservation easement be granted to the Town over the lower portion of both lots (below the septic fields and contour elevation of 450 feet), encompassing the narrow portion of Parcel A and the steeper slopes of Parcel B. Within the easement, no structures will be permitted, grading will be limited to the installation of a septic leachfield and/or stormwater detention systems, retaining walls are not permitted and fencing must be wildlife friendly. The Open Space Committee will review the easement language and area prior to recordation of the Final Map. Drainage The proposed parcels naturally drain over the site and will be required to maintain the existing flow patterns, using surface flow designs whenever possible. The Town Engineer requires the subdivision improvement plans to be submitted with the Final Map. Noise The Planning Commission and City Council also cited freeway noise impacts as another justification for limiting the further subdivision of Lot 2. Depending on the location of the property, freeway noise can be significant, and the Town does require all new residences along the Interstate 280 corridor to incorporate sound mitigation materials into their construction. The proposed subdivision and anticipated residential development will be regulated by the Town's established noise standards. A Traffic Noise Assessment Study was prepared by Edward L. Pack Associates, Incorporated (the July 3, 2015 study is included as an exhibit to the Initial Study — see Attachment 3). Due to noise generated from the Interstate 280 freeway, existing ambient noise levels at the proposed building site on Parcel A is 61 dB Community Noise Equivalent Level (CNEL) and 67 dB CNEL for Parcel B. The Town's General Plan Noise standards specify residential noise exposure limits for usable outdoor spaces at 60 dB CNEL (General Plan, Land Use and Noise Compatibility Guidelines Figure 7-4) and interior noise exposures are limited to 45 dB CNEL (General Plan, Noise Element Goal 2, Policy 2.2). Based Lands of Gera January 6,2016 Page 6 of 15 on current California Building Codes, all new residential construction must comply with a 45 dB interior noise limit. This can be achieved using standard building construction methods and materials. However, exterior noise levels will require mitigation to lower noise volumes to a less than significant level. The report includes mitigation measures for the usable outdoor living areas such as placing the usable outdoor areas on the west side of the proposed dwelling (utilizing the residence as a sound barrier) and/or utilizing a six-foot high acoustically effective barrier around the usable outdoor areas. The report maintains that all parcels with future buildings can be mitigated to an acceptable level for both interior and exterior noise. In order to mitigate noise impacts, the Final Parcel Map shall include a 60 dB CNEL noise line to delineate which portions of the two parcels are impacted by existing freeway noise. The 60 dB CNEL line shall correspond with the line shown in Figure 1 of the Noise Assessment study. All future residential development on the parcels will require a noise analysis of the proposed usable outdoor areas to determine if they meet the Town's noise standards. COMMITTEE REVIEW Subdivision Committee The Subdivision Committee comprised of Commissioner Couperus, the Planning Director, John Chau in Engineering and Consultant Planner Cynthia Richardson, convened on March 25, 2015 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. The agenda from the meeting is attached (Attachment 7). Staff presented the tentative map and summarized the comments received from the Planning and Engineering Departments, Town committees, the Town Geotechnical Consultant, Santa Clara County Fire Department and the County Department of Environmental Health. The property owners and their engineer were present along with one neighbor, Mary Lou Salazar, who resides at 12390 Gigli Court. Four written comments were also received prior to the meeting with three in support and the fourth opposed (see Attachment 8). The Subdivision Committee discussed the comments received and provided the owner with the information necessary to make the application complete. In addition, the applicant and project engineer were provided with historical information on landslides in the vicinity of the project. Environmental Design and Protection Committee The Committee stated that the subject property is highly visible from the homes on La Cresta Drive and that freeway noise is loud. Concerns were stated about the potential for a three-story residence due to the sloping lot and the Committee was not supportive of construction on the bare, highly visible slope (see Attachment 9). Lands of Gera January 6, 2016 Page 7 of 15 Pathways Committee The Pathways Committee recommended that an in-lieu fee be paid for one parcel. Open Space Committee The Open Space Committee requested that a wildlife corridor assessment be done to determine if the lower portion of the property encompasses a potential wildlife corridor that extends along Interstate 280. In order to assess potential impacts to local wildlife movement patterns from the proposed subdivision, Live Oak Associates, Inc. was retained to prepare a technical analysis addressing this issue (the June 15, 2015 report is included as an exhibit to the Initial Study— see Attachment 3). The analysis concluded that although the development of the parcels will shift wildlife patterns to some degree, the small amount of additional disturbance that may result from the creation of the additional lot will not be significant and is not expected to have any long term adverse impact to the local occurrence or abundance of key wildlife species. In addition, the study recommends the use of native plants in landscaping and wildlife friendly landscaping. Based on this study, staff developed Biologic Resources Mitigation Measure 1 which states that all new landscaping on the lower portions of the lots consist of native plants and that non-native invasive plant species shall be removed. In addition, wildlife friendly fencing shall be utilized to the extent practicable, particularly between Parcels A and B and along the northeasterly property line (area closest to the freeway). Additionally, an open space easement will be granted over the lower portions of both lots as described in the open space easement section above. ENVIRONMENTAL REVIEW In compliance with the California Environmental Quality Act (CEQA), an Initial Study, Mitigated Negative Declaration (MND) and Mitigation Monitoring Program have been prepared for the project. The review period for the MND will end on January 6, 2016. The Planning Commission may comment on both the Initial Study/Mitigated Negative Declaration and the Tentative Map. The MND 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 observation of State and County requirements for handling archaeological remains and artifacts if found, geologic considerations, biologic considerations, noise reduction measures and dedication of open space easements (see Mitigation Monitoring Program, Attachment 4). CONCLUSIONS Based on the Initial Study, staff has concluded that the proposed subdivision, as mitigated, will not have a significant effect on the environment. The Mitigated Negative Declaration identifies specific mitigation measures and establishes a Mitigation Monitoring Program to address the potentially significant environmental impacts identified in the Initial Study. Lands of Gera January 6, 2016 Page 8of15 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. The Tentative Parcel Map is also consistent with the State Subdivision Map Act. ATTACHMENTS 1. Recommended Findings for Subdivision Approval 2. Recommended Conditions of Approval 3. Initial Study, Mitigation Monitoring Program and Exhibits 4. Mitigated Negative Declaration 5. October 5, 1977 City Council Minutes and report, September 14, 1977 Planning Commission Minutes, 1977 Comment Letters and Geologic Report 6. Letter from Cotton, Shires and Associates, Inc. dated December 21, 2015 7. Subdivision Committee Meeting Agenda dated March 25, 2015 8. Comment letters from surrounding residents 9. Town Committee Comments 10. Tentative Map plan set (Commission only) Lands of Gera ATTACHMENT 1 January 6, 2016 Page 9 of 15 ATTACHMENT 1 RECOMMENDED FINDINGS FOR THE TWO LOT SUBDIVISION OF A 2.85-ACRE PARCEL LANDS OF GERA (Assessor's Parcel Number 182-04-075) FILE#51-15-TM-IS-ND 1. The subdivision as proposed would create two lots that meet all of the minimum requirements in the Town's Subdivision Ordinance with regard to the following: minimum lot area of one acre; minimum Lot Unit Factor of 1.0; the location of a 160-foot diameter building circle within the proposed parcel boundaries thereby indicating that the parcel contains a viable building site; a minimum of one net acre within a 350-foot diameter circle that encompasses each parcel; and the lots meet the minimum slope density requirement based on the proposed average slope of the lots. 2. The proposed subdivision would create two lots that are compatible with the permitted density on the Land Use Map for the Town and consistent with the Land Use and Conservation Elements in the General Plan which include policies to preclude development on slopes of greater than 30%, minimize disturbance of natural terrain and vegetation, and preserve heritage oaks. In addition, an easement will be dedicated over the lower portions of the property to maintain the open space in perpetuity. 3. Access to the proposed lots will be provided from a public 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. In addition, septic systems have been tentatively approved for both lots per Santa Clara County Department of Environmental Health standards. 4. All lots as proposed on the Tentative Parcel 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. 5. All potentially significant environmental effects can be reduced to a less than significant impact with mitigation as determined in the Initial Study and 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 design of the subdivision and the proposed improvements are not likely to cause serious public health problems. It has been determined that each of the proposed lots Lands of Gera January 6,2016 Page 10 of 15 contains a suitable building site, and that the proposed density is consistent with the General Plan. 7. 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. Lands of Gera ATTACHMENT 2 January 6,2016 Page 11 of 15 ATTACHMENT 2 RECOMMENDED CONDITIONS FOR THE TWO-LOT SUBDIVISION OF A 2.85-ACRE PARCEL LANDS OF GERA (Assessor's Parcel Number 182-04-075) FILE#51-15-TM-IS-ND GEOTECHNICAL/EARTHWORK 1. The fault trace line for the Monte Vista Fault and a 40 foot Building Setback Line from said fault trace shall be shown on the Final Map. 2. The project Geotechnical Consultant shall complete a subsurface exploration within the proposed septic leachfield areas to investigate the geologic and geotechnical viability of the septic systems prior to recordation of the Final Map. The presence of past landsliding, depth to colluvial soils, and depth to competent bedrock materials shall be determined. Appropriate geotechnical recommendations shall be provided, as warranted, to address adverse conditions if encountered. LAND AND EASEMENT DEDICATION 3. 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: AT&T Telephone Company, Pacific Gas and Electric Company, Comcast Cable Television, and Purissima Hills Water District. The dedications shall all be completed in conjunction with the Final Map approval, to the satisfaction of the City Engineer. 4. The applicant shall dedicate additional right of way easement to create 30' wide half width right of way over Gigli Court. The dedications shall be completed in conjunction with the Final Map approval, to the satisfaction of the City Engineer. 5. An open space/conservation easement shall be granted to the Town of Los Altos Hills over the lower portion of Parcel A and B (below the septic fields at a tentative contour elevation of 450 feet), encompassing the narrow portion of Parcel A and the steeper slopes of Parcel B. Within the easement, no structures or retaining walls will be permitted, grading will be limited to the installation of a septic leachfield and stormwater detention systems, and fencing must be wildlife friendly. Native vegetation may also be planted within the easement. The Open Space Committee will review the easement language and easement boundary prior to recordation of the Final Map. Lands of Gera January 6,2016 Page 12 of 15 IMPROVEMENTS 6. A Subdivision Improvement Plan which includes an Erosion and Sedimentation Control plan shall be submitted for review and approval by the City Engineer as part of the Subdivision Improvement Plans. This plans 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; 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. 7. All 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. 8. 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. 9. 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 Gigli Court; storage of construction materials; placement of sanitary facilities; parking for construction 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 Green Waste Recovery, Inc. for the debris box, since they have a franchise with the Town and no other hauler is allowed within the Town limits. 10. Improvement plans for the subdivision shall be submitted for review and approval by the Town Engineer prior to commencement of improvement work. 11. All subdivision improvements shall be constructed to the satisfaction of the Town Engineer or bonded for prior to recordation of the Final Map. Lands of Gera January 6, 2016 Page 13 of 15 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 and capped in accordance with the SCVWD standards. 14. All existing structures located within the building setback lines shall be removed prior to recordation of the Final Map. PLANNING AND ZONING 15. Payment of park and recreation dedication fees, pathway in lieu fee, 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. 16. 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. 17. The applicant shall defend, indemnify, and hold harmless the Town of Los Altos Hills and its agents, officers, and employees from any claim, action, or proceeding against the Town of Los Altos Hills or its agents, officers, or employees to attack, set aside, void, or annul an approval of the project to the extent such actions are brought within the time period required by Government Code Section 66499.37 or other applicable law; provided, however, that the Applicant's duty to so defend, indemnify, and hold harmless shall be subject to the Town's promptly notifying the Applicant of any said claim, action, or proceeding and the Town's full cooperation in the defense of such actions or proceedings. 18. Prior to beginning any grading, construction or demolition operations, all significant trees shall be fenced with chain link type material at the 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 drip lines. All large and heritage oak trees shall be retained to the greatest extent feasible. 19. The main residence on Parcel A, the pool, the carport on Parcel B and all hardscape, decks and other improvements located within the future building setback lines of Parcels A and B, exclusive of the existing driveway access to the second unit on Parcel B, shall be removed prior to recordation of the Final Map. Lands of Gera January 6, 2016 Page 14 of 15 20. All existing septic systems and leachfields that cross the future property line between Parcels A and B shall be abandoned in accordance with Santa Clara County Environmental Health Department standards. 21. The Final Parcel Map shall include a 60 dB CNEL noise contour line to delineate which portions of the two parcels are impacted by existing freeway noise in excess of 60 dB CNEL. The 60 dB CNEL line shall correspond with the line shown in Figure 1 of the Traffic Noise Assessment Study prepared by Edward L. Pack Associates, Incorporated dated July 3, 2015. 22. The applicant shall ensure that noise generating construction activities are limited to Monday through Saturday between the hours of 8:00 am and 5:30 pm. No heavy noise generating equipment is allowed to be used on Saturdays and no construction is allowed on Sundays or holidays as noted per Chapter 7, Sec.5-7-01 of the Los Altos Hills Municipal Code. 23. To reduce noise impacts to the anticipated residences located along Interstate 280, construction plans for proposed single family dwellings on the newly created parcels shall incorporate appropriate noise reducing measures such as: • Minimum Sound Transmission Class (STC) rating specification for the windows and doors for the noise impacted spaces with a closed window condition. • Exterior noise barriers made of any solid, air-tight material that is acceptable for outdoor use and has a minimum surface weight of 2.5 lbs. per sq. ft. • Earth berms or combinations of berms with shorter fences or walls on top. • Terracing a sloped site where the shoulder of the slope (edge of terrace) acts as a barrier if the receptor is far enough back so that the view to the freeway is shielded. 24. The applicant shall concurrently record a note on the Final Map and record a deed restriction for each parcel created by the subdivision stating, "To meet the interior noise standard for residential areas of 45 dB CNEL, the construction of single-family dwellings on each created parcel shall implement noise mitigation measures at the time of construction. A qualified noise consultant shall provide documentation at the time of Site Development, identifying architectural or construction measures to be taken to assure that interior noise levels will not exceed 45 dB CNEL (General Plan, Noise Element Goal 2, Policy 2.2) and exterior noise levels at outdoor living areas will not exceed 60 dB CNEL (General Plan, Land Use and Noise Compatibility Guidelines Figure 7-4)." 25. The applicant shall concurrently record a note on the final map and record a deed restriction for each parcel created by the subdivision stating, "A final acoustical report prepared by a qualified professional to verify a structural attenuation capability to achieve an interior noise standard of 45 dB CNEL (General Plan, Noise Element Goal 2, Policy 2.2) and an exterior noise level at outdoor living areas of 60 dB CNEL, (General Plan, Land Use and Noise Compatibility Guidelines Figure 7-4) shall be submitted to the Town Lands of Gera January 6,2016 Page 15 of 15 of Los Altos Hills at the time of Site Development. The Planning Department shall review and approve the report prior to the final inspection or occupancy of the new residence." 26. 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. 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. 27. All new landscaping on the lower portions of the lots below the septic leachfields shall consist of native plants. Non-native invasive plant species shall be removed. In addition, wildlife friendly fencing shall be utilized to the extent practicable, particularly between Parcels A and B and along the northeasterly property line (area closest to the freeway). 28. Addresses shall be assigned and approved by the Town as required by the Santa Clara County Fire Department and in accordance with Town policies. 29. The new residence on Parcel A, as shown on the Tentative Parcel Map, is conceptual only and no approval of any residence is indicated by approval of the Tentative Parcel Map. Site development applications for any new residences shall be submitted to the Planning Department for review and approval. 30. Demolition permits for the existing main residence, pool, other structures and hardscape may be obtained once the Tentative Map is approved. FIRE DISTRICT REQUIREMENTS 31. 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, providing an emergency vehicle turnaround, placement of property address signs that are clearly visible from the right-of-way, and providing an approved access system if the lots are fenced and gated. ATTACHMENT 3 INITIAL STUDY Initial Study Checklist & References Tentative Parcel Map Application Lands of Gera 51-15-TM-IS-MND December 15, 2015 Town of Los Altos Hills-Planning Department 26379 Fremont Road Los Altos Hills, CA 94022 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 2 of 34 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 area 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 be the project applicant, then the project would be eligible for a Mitigated Negative Declaration. Environmental Checklist Form 1. Project Title: Gera Subdivision 2-lot Subdivision, (File# 51-15-TM-IS-MND) 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: Steve Padovan, Consultant Planner(650) 941-7222 4. Initial Study prepared by: Steve Padovan, Consultant Planner (650) 941-7222 5. Project Location: 12345 Gigli Court, Los Altos Hills, California. The project site is located on the east side of Gigli Court near the terminus of the street and directly west of Interstate 280 in Los Altos Hills, California, 94022; APN#182-04-075. 6. Project Sponsor's Name and Address: Anil and Anita Gera, 12345 Gigli Court, Los Altos Hills, CA 94022 7. General Plan Designation: R-Residential 8. Zoning: R-A (Residential-Agricultural) 9. Description of Project: The applicant/owner is requesting approval of a tentative subdivision map to subdivide one parcel totaling 2.85 gross acres into two parcels for development of single-family residential homes: Parcel A = 1.44 acres; Parcel B = 1.41 acres. Access to parcels A and B is provided directly off Gigli Court which is a public road. The lots will have separate septic systems and water service will be provided by Purissima Hills Water District. The existing primary dwelling and pool will be removed prior to recordation of the map. The secondary unit will remain and be occupied by the owner until a new dwelling is constructed on the other.-parcel. All new power and utility lines within the subdivision will be placed underground. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 3 of 34 10. Surrounding Land Uses and Setting: The project site is located on the east side of Gigli Court at the top of the slope above Interstate 280. Surrounding land uses include one and two story single-family residences with a minimum lot size of 1 acre. The properties on Gigli Court were originally subdivided through Tract No. 6763 in 1980 which created six lots. The subject property is Lot 2. The property contains a primary dwelling and secondary unit along with a pool, pool house, carport and related hardscape. The property is generally flat within 160 to 200 feet from the street and then slopes downward towards the freeway. There is a cluster of oaks behind the secondary unit and trees along the perimeter of the property. The vegetation is primarily grasses on the remainder of the undeveloped portion of the lot. There is a fault trace located near the street which bisects the existing primary dwelling. All new habitable structures will be set back a minimum of 25 feet from the fault trace. 11. Other public agencies whose approval is required: Santa Clara County Fire Department, County of Santa Clara Department of Environmental Health Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 4 of 34 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED: The environmental factors checked below would be potentially affected by this project, involving at least one impact that is a"Potentially Significant Impact" as indicated by the checklist on the following pages. ❑ Aesthetics ❑ Agriculture and Forestry ❑ Air Quality Resources E Biological Resources El Cultural Resources Ei Geology/Soils ❑ Greenhouse Gas Emissions ❑ Hazards and Hazardous ❑ Hydrology/Water Quality Materials ❑ Land Use/Planning ❑ Mineral Resources [I Noise U Population/Housing ❑ Public Services ❑ Recreation ❑ Transportation/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. DETERMINATION 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 case because revisions in the project have been made by or agreed to by the project proponent.A MITIGATED NEGATIVE DECLARATION will be prepared. ❑ I find that the proposed project MAY have a significant effect on the environment,and an ENVIRONMENTAL IMPACT REPORT is required. ❑ I fmd that the proposed project MAY have a"potentially significant impact"or"potentially significant unles mitigated impact"on the environment,but at least one effect: 1)has been adequately analyzed in an earlier document pursuant to applicable legal standards,and 2)has been addressed by mitigation measures based on the earlier analysis as described on attached sheets.An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the effects that remain to be addressed. U I find that although the proposed project could have a significant effect on the environment,because all potentially significant effects(a)have been analyzed adequately in an earlier EIR or NEGATIVE DECLARATION pursuant to applicable standards,and(b)have been avoided or mitigated pursuant to that earlier EIR or NEGATIVE DECLARATION,including revisions or mitigation measures that are imposed upon the proposed project,nothing further is required. Signature: 2\_C-7 VM— V 1, V I l9"\ Date: December 15.2015 Suzanne Avila,AICP,Planning Director Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 5 of 34 EVALUATION OF ENVIRONMENTAL IMPACTS: 1) A brief explanation is required for all answers except "No Impact" answers that are adequately supported by the information sources a lead agency cites in the parentheses following each question.A"No Impact" answer is adequately supported if the referenced information sources show that the impact simply does not apply to projects like the one involved (e.g., the project falls outside a fault rupture zone). A "No Impact" answer should be explained where it is based on project-specific factors as well as general standards (e.g., the project will not expose sensitive receptors to pollutants,based on a project-specific screening analysis). 2) All answers must take account of the whole action involved, including off-site as well as on-site, cumulative as well as project-level,indirect as well as direct,and construction as well as operational impacts. 3) Once the lead agency has determined that a particular physical impact may occur, then the checklist answers must indicate whether the impact is potentially significant, less than significant with mitigation, or less than significant. "Potentially Significant Impact" is appropriate if there is substantial evidence that an effect may be significant. If there are one or more "Potentially Significant Impact" entries when the determination is made,an EIR is required. 4) "Negative Declaration: Less Than Significant With Mitigation Incorporated" applies where the incorporation of mitigation measures has reduced an effect from "Potentially Significant Impact" to a "Less Than Significant Impact." The lead agency must describe the mitigation measures, and briefly explain how they reduce the effect to a less than significant level (mitigation measures from"Earlier Analyses," as described in (5)below,may be cross-referenced). 5) Earlier analyses may be used where, pursuant to the tiering, program EIR, or other CEQA process, an effect has been adequately analyzed in an earlier EIR or negative declaration. Section 15063(c)(3)(D).In this case, a brief discussion should identify the following: a)Earlier Analysis Used.Identify and state where they are available for review. b) Impacts Adequately Addressed. Identify which effects from the above checklist were within the scope of and adequately analyzed in an earlier document pursuant to applicable legal standards, and state whether such effects were addressed by mitigation measures based on the earlier analysis. c) Mitigation Measures. For effects that are "Less than Significant with Mitigation Measures Incorporated," describe the mitigation measures which were incorporated or refined from the earlier document and the extent to which they address site-specific conditions for the project. 6) Lead agencies are encouraged to incorporate into the checklist references to information sources for potential impacts (e.g., general plans, zoning ordinances). Reference to a previously prepared or outside document should,where appropriate, include a reference to the page or pages where the statement is substantiated. 7) Supporting Information Sources: A source list should be attached, and other sources used or individuals contacted should be cited in the discussion. 8) This is only a suggested form, and lead agencies are free to use different formats; however, lead agencies should normally address the questions from this checklist that are relevant to a project's environmental effects in whatever format is selected. 9) The explanation of each issue should identify: a)the significance criteria or threshold, if any,used to evaluate each question; and b)the mitigation measure identified, if any,to reduce the impact to less than significance. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 6 of 34 Y a L 5 XY f Less Than Patenhally Less Than Significant with < z Significant atton ' Significant _No Impact r p Mrtig Impact Im act Incorporated I.AESTHETICS--Would the project: a) Have a substantial adverse effect on a ❑ ❑ Q ❑ scenic vista? b) Substantially damage scenic resources, including, but not limited to, trees, rock ❑ ❑ ❑ Q outcroppings, and historic buildings within a state scenic highway? c) Substantially degrade the existing visual ❑ ❑ Q ❑ character or quality of the site and its surroundings? d) Create a new source of substantial light ❑ ❑ Q ❑ or glare which would adversely affect day or nighttime views in the area? DISCUSSION: a) Less Than Significant Impact.The Los Altos Hills General Plan identifies important vistas,historic sites,and scenic highways within the Town. None of these resources listed in the General Plan will be significantly impacted by the proposal because the property is not located within a designated scenic area, is currently developed with structures,and the lot is located within an existing developed area of single-family homes. Mitigation: None b) No Impact.The proposed project is situated along Interstate Highway 280. Currently 1-280 is not designated as a state scenic highway through the Town of Los Altos Hills. Therefore,the project will have no impact to scenic resources along a scenic highway. Mitigation: None c) Less Than Significant Impact. The property is currently developed with a primary residence, a second unit,a pool house,pool and associated driveways and hardscape. All development is located at the top of the slope closest to Gigli Court and is currently visible from Interstate 280. The subdivision will not result in the removal of any existing trees and the proposed building areas on each new parcel will be in a similar location to the existing development on the site. In addition, through the Site Development Permit process, visual impacts due to site grading and residential construction are reviewed by the Town new residences are evaluated for aesthetic impacts such as structure height, size, setbacks, grading, fencing, tree preservation, and lighting.Furthermore,the Town's development guidelines require significant landscape screening for the proposed home once final design drawings are submitted to the Town. Mitigation: None d) Less Than Significant Impact. The Town has established standards and policies for outdoor lighting of all new residential dwellings. The policy states that outdoor lighting should use the minimum wattage lighting which will safely illuminate the area. Standard conditions require that all outdoor light be directed downward and shielded to prevent light from shining onto neighboring properties. In addition,the property is currently developed with two dwelling units and contains outdoor lighting which is not currently compliant with the Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 7 of 34 Town's policy. Therefore, the redevelopment of the property with new residences will likely reduce the amount of glare and light spillover from the existing fixtures. Mitigation: None Sources: 1,2,5,6 Less Than Potentially Less Than Sficant Mitigat ont with Significant No Impact , :, `Impact I or Impact nc "poration II.AGRICULTURE AND FOREST RESOURCES— Would the project: a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the ❑ ❑ ❑ Q maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non- agricultural use? b) Conflict with existing zoning for ❑ ❑ ❑ agricultural use, or a Williamson Act contract? c) Conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code Section 12220(g)), ❑ ❑ ❑ timberland (as defined in Public Resources Code Section 4526), or timberland zoned Timberland Production (as defined by Government Code Section 51104(g))? d) Result in the loss of forest land or ❑ ❑ ❑ Q conversion of forest land to non-forest use? e) Involve other changes in the existing environment which, due to their location or ❑ ❑ ❑ Q nature, could result in conversion of Farmland,to non-agricultural use? DISCUSSION: a-e) No Impact. The proposed subdivision will have no foreseeable impact on Agriculture and Forest Resources. The site is currently not used as agricultural land, is designated as urban and built-up land on the Santa Clara County Important Farmland Map of 2012, is not under Williamson Act Contract' has no existing forest resources. Mitigation: None. Sources: 1, 8 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 8 of 34 F rt Potentially Si nifi ant withLess Than Significantg _ : .'Significant No Impact Im act Mitigation act P " P e Incorporation = III.AIR QUALITY--Would the project: a) Conflict with or obstruct implementation of ❑ ❑ ❑ Q the applicable air quality plan? b)Violate any air quality standard or contribute substantially to an existing or projected air ❑ ❑ ❑ Q 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 federal or state ambient air quality ❑ ❑ Q ❑ standard (including releasing emissions which exceed quantitative thresholds for ozone precursors)? d) Expose sensitive receptors to substantial pollutant concentrations? ❑ ❑ Q ❑ e) Create objectionable odors affecting a ❑ ❑ Q ❑ substantial number of people? DISCUSSION: a) No Impact.The subdivision of the property into two lots is compatible with the Town's General Plan and with the land use assumptions in the countywide air quality plan. The creation of one new residential parcel will not obstruct implementation of the air quality plan. Mitigation: None. b) No Impact. Santa Clara County is currently a non-attainment basin for ozone thresholds but achieves an attainment level for carbon monoxide emissions. The creation of one new residential parcel will not contribute substantially to the existing air quality violations based on the thresholds of significance established by the Bay Area Air Quality Management District CEQA Air Quality Guidelines—updated May 2011. Mitigation: None. c) Less Than Significant Impact. The subdivision will result in the creation of one new residential parcel with no increase in permitted density. This level of development is anticipated in the Town's General Plan and would not result in a cumulatively considerable net increase in any criteria pollutant based on the thresholds of significance established by the Bay Area Air Quality Management District CEQA Air Quality Guidelines — updated May 2011. Mitigation: None. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 9 of 34 d) Less Than Significant Impact. The project consists of the creation of one new residential lot in a low density single family residential area. The property is not located adjacent to a school,hospital, day care facility or other type of facility with sensitive receptors who might be affected by construction on the new parcel. Therefore, the project will not have a significant impact on sensitive receptors. Mitigation: None. e) Less Than Significant Impact. The subdivision will result in the creation of a new parcel and the potential construction of a new single family dwelling. The construction process may involve the use of heavy construction equipment and other diesel operated machinery, involve the use of paints, or result in the use of other chemicals and processes that may produce odors. However, these impacts are temporary in nature, are limited in scale, and state laws regulate diesel emissions and limit the amounts of volatile organic compounds in paints and other chemical applications. Mitigation: None Sources: 1,3,4,5,9 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 10 of 34 Less Than Potentially Less Than Significant with Significant Significant No Impact Impact Mitigation - Impact Incorporation �, 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, ❑ ❑ Q ❑ sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S.Fish and Wildlife Service? b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional ❑ ❑ Q ❑ 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 ❑ ❑ Q ❑ (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? d) Interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native ❑ Q ❑ ❑ 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, ❑ Q ❑ ❑ such as a tree preservation policy or ordinance? I) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural ❑ ❑ ❑ Q Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? DISCUSSION: a) Less Than Significant Impact. Special-status species are generally rare, restricted in distribution, declining throughout their range or have a critical,vulnerable stage in their life cycle that warrants monitoring. Many of these species are associated with riparian or serpentine habitats which do not exist on the project site. Two special status wildlife species are listed in the California Natural Diversity Database (CNDDB) within the Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 11 of 34 general project vicinity; the Cooper's hawk (Accipiter cooperii) and the San Francisco dusky-footed woodrat (Neotoma fuscipes annectens). However, the two are not expected to occur on the project site because the habitat suitable for their presence is marginal within the project site and there are no instances of these species found on properties immediately adjacent to or surrounding the subject property. In addition, all new development would occur on the upper portion of the property which is already developed with two residential units, driveways, a pool and related hardscape. The lower portion is undisturbed non-native grasslands with several oak trees and other mixed trees along the property line. These undisturbed areas would not be significantly affected by future development of the site as proposed. Mitigation: None. b,c)Less Than Significant Impact. Based on field observations by staff,the topography of the land, and the types of plant communities observed on the site (non-native grasslands and scattered groups of trees), there are no riparian habitats on the site nor any visible wetlands or vernal pools. Any potential wetlands on adjacent properties at the base of the slope are furthest from the proposed development area and will not be disturbed by the subdivision. Mitigation: None. d) Less Than Significant with Mitigation. The lower portion of the property is located along a potential wildlife corridor that extends along Interstate 280. In order to assess potential impacts to local wildlife movement patterns from the proposed subdivision, Live Oak Associates, Inc. was asked to prepare a technical analysis (dated June 15, 2015) addressing this issue. The analysis concluded that although the development of the parcels will shift wildlife patterns to some degree, the small amount of additional disturbance that mayresult from the creation of the additional lot will not be significant and is not expected to have any long term adverse impact to the local occurrence or abundance of key wildlife species. In addition, the study recommends the use of native plants in landscaping and wildlife friendly landscaping. Biologic Mitigation Measure 1: New landscaping on the lower portions of the lots shall consist of native plants and non-native invasive plant species should be removed. In addition, utilize wildlife friendly fencing to the extent practicable, particularly between Parcels A and B and along the northeasterly property line (area closest to the freeway). e) Less Than Significant with Mitigation. The General Plan Open Space and Recreation Element contains policies that encourage the preservation of open space on parcels within Open Space Conservation Areas that have slopes of 30% or more, contain heritage trees, or sensitive habitat areas. The area on the parcels designated for future development is on the upper half of the lots which currently contains two dwellings, a pool, driveways, decks and other hardscape. No trees are proposed for removal nor would any trees need to be removed to subdivide the property. However, the property is located directly adjacent to an Open Space Conservation Area as shown on the General Plan Land Use Map and the property between the freeway and the subject lot is vacant and in a more natural state. Furthermore, the lower portion of the subject property has heritage oak trees and is highly visible from the freeway and from properties on La Cresta Drive. Based on these factors, the development of the lower portions of the lot may result in significant impacts to these natural resources. In order to mitigate this impact, an open space easement shall be provided over the lower portion of the lots. Biologic Mitigation Measure 2: Prior to recordation of the Final Parcel Map, an open space/conservation easement shall be granted to the Town over the lower portion of both lots, encompassing the narrow portion of Parcel A and the steeper slopes of Parcel B. Within the easement, no structures shall be permitted, grading shall be limited to the installation of a septic leachfield and/or stormwater detention systems, retaining walls are not permitted and fencing shall be wildlife.friendly. The Open Space Committee shall review the easement language and area prior to recordation of the final map. f) No Impact. There are no adopted Habitat Conservation Plans,Natural Community Conservation Plans, or other approved local,regional,or state habitat conservation plans that would be affected by the proposed subdivision. Mitigation: None. Sources: 1,2, 5, 10,21 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 12 of 34 Potentiahy Less Than ; Less Than b' Significant Significant with Significant No Impact , M�hgatton Impact Impact r Incorporation • V.CULTURAL RESOURCES— Would the project: a) Cause a substantial adverse change in the significance of a historical resource as defined ❑ ❑ ❑ Q in'15064.5? b) Cause a substantial adverse change in the significance of an archaeological resource ❑ ❑ Q ❑ pursuant to'15064.5? c) Directly or indirectly destroy a unique paleontological resource or site or unique ❑ ❑ ❑ Q geologic feature? d) Disturb any human remains, including ❑ ❑ Q ❑ those interred outside of formal cemeteries? DISCUSSION: a-d)Less Than Significant with Mitigation Incorporation. 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. The property was historically used for grazing and low intensity cultivation of fruit trees and the site does not contain a listed historical building or any known archeological resources. However, there is the potential for unknown paleontological resources or human remains to be discovered during grading operations. Cultural Resources Mitigation Measure 1: 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 Coroner or the County Coordinator of Indian Affairs if the remains are Native American. Sources:3,5, 17 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 13 of 34 s r Potentially Less Than i ; S► nificant with - ;Significant g Significant No Impact Im acf Mitigatton Im act p Incorporation p VI.GEOLOGY AND SOILS--Would the project: a) Expose people or structures to potential ❑ Q ❑ ❑ 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 State Geologist for the area or based on other ❑ Q ❑ ❑ substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. ii)Strong seismic ground shaking? ❑ Q ❑ ❑ iii) Seismic-related ground failure, including ❑ ❑ ❑ liquefaction? iv)Landslides? ❑ Q ❑ ❑ b)Result in substantial soil erosion or the loss of topsoil? ❑ ❑ Q ❑ c)Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in ❑ ❑ Q ❑ on- or off-site landslide, lateral spreading, subsidence,liquefaction or collapse? d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code ❑ ❑ Q ❑ (1994), creating substantial risks to life or property? e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems ❑ ❑ Q ❑ where sewers are not available for the disposal of waste water? DISCUSSION: a) Less Than Significant with Mitigation Incorporation. The Town's Geotechnical and Seismic Hazard Zones Map indicates a fault trace running through the easterly portion of the property. When the property was originally created through a subdivision in 1977, a Geotechnical Investigation Report, prepared by Richard Rowland, C.E.G.,found evidence of the fault trace running through the property and recommended a forty foot building setback for all structures. The existing primary dwelling on the site is located within this setback area. An additional geologic review, conducted by the applicant's consultant Murray Engineers, Inc. (dated July 18, 2014) confirmed the location of the fault based on evidence collected at the property directly to the north. The report concluded that there was adequate area outside of the 40 foot fault setback and the 30 foot side yard setbacks to accommodate a new residence. The Town's geotechnical consultant, Cotton& Shires Associates, Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 14 of 34 peer reviewed the report and agreed with the fault location. Based on these conclusions, a 40 foot building setback line has been identified on the tentative map. In addition, a change in slope inclination on the lower portions of the property suggests the potential for shallow slope instability. The septic field is located in this area and the applicant's consultant analyzed the stability of the slopes to determine if the construction and operation of a septic field could destabilize the slopes. The consultant concluded in a letter dated June 9,2015 that the leachfields would not have a significant detrimental impact on the stability of the slopes because the soils are shallow with bedrock less than five feet below the surface. The Town's geotechnical consultant reviewed the June 9th letter and agreed with the findings. In addition, any future dwelling above the leachfield will require a soils report with recommendations on foundation type and installation. As for liquefaction,the topography of the site, depth to bedrock, and depth to groundwater substantially limit the potential for liquefaction. Geology and Soils Mitigation Measure 1: The Monte Vista Fault line and a 40 foot building setback line from the fault shall be identified on the Final Map and the existing house on Parcel A shall be removed prior to recordation of the map. b) Less Than Significant Impact. All new development on the parcels are required to conform to the Town's regulations with regard to erosion control,stormwater retention on-site and replanting of areas that have had the native vegetation removed. These regulations are implemented during the review process for the new residence. Mitigation: None. c) Less Than Significant Impact. See discussion under item a. Mitigation: None. d) Less Than Significant Impact. The property contains expansive soils on the,lower portions of the site,however, development is proposed on the upper portion of the site which is underlain with bedrock that is close to the surface. All new construction will require a soils report with recommendations on foundation type and installation. Mitigation: None. e) Less Than Significant Impact. The County of Santa Clara Department of Environmental Health has approved plans for a new septic system and leachfield on the new parcel. The septic field is located in this area and the applicant's consultant analyzed the stability of the slopes to determine if the construction and operation of a septic field could destabilize the slopes. The project geotechnical consultant concluded that the leachfields would not have a significant detrimental impact on the stability of the slopes as the soils are shallow with bedrock less than five feet below the surface. Mitigation: None. Sources:2,5, 6, 12, 18, 19 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 15 of 34 ▪ Less;Than Potentially Less Than v Significant with Significant Significant No Impact Mitigation Impact • Incorporation Impact VII.GREENHOUSE GAS EMISSIONS-- Would the project: a) Generate greenhouse gas emissions, either ❑ ❑ ❑ Q directly or indirectly, that may have a significant impact on the environment? b) Conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the ❑ ❑ ❑ Q emissions of greenhouse gases? DISCUSSION: a-b)No Impact. The subdivision will result in the creation of one new residential parcel with no increase in permitted density. This level of development is anticipated in the Town's General Plan and in the regional plans developed by regional agencies. In addition, the creation of one additional residential parcel would not result in the generation of a significant amount of greenhouse gases based on the thresholds of significance established by the Bay Area Air Quality Management District CEQA Air Quality Guidelines —updated May 2011. Mitigation: None Sources:5,9 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 16 of 34 r - Less Than Potentially Less Than Significant with Significant Mitigation Sigmfcant No Impact Impact x Impact Incorporation VIII.HAZARDS AND HAZARDOUS MATERIALS-- Would the project: a) Create a significant hazard to the public or the ❑ ❑ ❑ Q 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? c) Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or ❑ ❑ ❑ Q waste within one-quarter mile of an existing or proposed school? d) Be located on a site which is included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5 and,as a result, ❑ ❑ ❑ Q would it create a significant hazard to the public or the environment? 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 ❑ ❑ ❑ Q airport, would the project result in a safety hazard for people residing or working in the project area? f) For a project within the vicinity of a private airstrip, would the project result in a safety hazard ❑ ❑ ❑ Q for people residing or working in the project area? g)Impair implementation of or physically interfere with an adopted emergency response plan or ❑ ❑ ❑ Q 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 ❑ ❑ Q ❑ urbanized areas or where residences are intermixed with wildlands? DISCUSSION: a-d)No Impact. The proposed subdivision and anticipated residential development of one additional single family residence would not result in any hazards or the creation of hazardous waste. In addition, the property is not included on any list of hazardous materials sites. Mitigation: None. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 17 of 34 e-f) No Impact. The site is not located within an airport land use plan or in the vicinity of a public or private airstrip. Mitigation: None. g) No Impact. The proposed subdivision will not impair implementation or interfere with any emergency response plans as the site is located at the end of a cul-de-sac and would not impair or block an evacuation route. Mitigation: None. h) Less Than Significant Impact. The site is located within the Town's designated Wildland Urban Interface Fire Area. Therefore, all new residential construction is required to conform to the Wildland Urban Interface regulations in the California Building Code, Chapter 7A which stipulates construction methods for homes in a high fire risk zone,and will be reviewed and approved by the Santa Clara County Fire District. Mitigation: None. Sources: 1,3, 5, 13, 14 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 18 of 34 Potentially' Significant with Less Than a Significant Significant No Impact Mitigation f ; Impact Incorporation Impact 4 IX.HYDROLOGY AND WATER QUALITY-- Would the project: a) Violate any water quality standards or waste ❑ ❑ Q ❑ discharge 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 level (e.g., the production rate of pre- ❑ ❑ ❑ Q existing nearby wells would drop to a level which would not support existing land uses or planned uses for which permits have been granted)? c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a ❑ ❑ [J( ❑ manner which 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 ❑ ❑ Q ❑ substantially increase the rate or amount of surface runoff in a manner which would result in flooding on-or off-site? e)Create or contribute runoff water which would exceed the capacity of existing or planned ❑ ❑ Q ❑ stormwater drainage systems or provide substantial additional sources of polluted runoff? f)Otherwise substantially degrade water quality? ❑ ❑ Q ❑ g)Place housing within a 100-year flood hazard area as mapped on a federal Flood Hazard ❑ ❑ ❑ Q Boundary or Flood Insurance Rate Map or other flood hazard delineation map? h) Place within a 100-year flood hazard area structures which would impede or redirect flood ❑ ❑ ❑ flows? i) Expose people or structures to a significant risk of loss, injury or death involving flooding, ❑ O ❑ Q including flooding as a result of the failure of a levee or dam? j)Inundation by seiche,tsunami,or mudflow? ❑ ❑ 0 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 19 of 34 DISCUSSION: a) Less Than Significant Impact. The proposal involves the creation of one additional residential lot in a very low density residential area. The development of this new parcel will require the construction of a new septic system that will be regulated by Santa Clara County Department of Environmental Health and will be required to meet the current requirements for wastewater discharge. The new septic field should not result in any potential impacts to groundwater quality or result in wastewater discharge to surface waters. Mitigation: None b) No Impact. All new residential construction on the future parcel will be required to connect to municipal water. Mitigation: None. c-e)Less Than Significant Impact. The proposed subdivision and anticipated residential development will have a less than significant impact on drainage and stormwater run-off. The parcels naturally drain to the northeast and any new grading and stormwater run-off will be required to maintain the existing flow patterns, using surface flow designs whenever possible. In addition, the site is currently developed with impervious surfaces over a large portion of the upper areas of the lots and new development will likely result in a reduction in impervious surfaces and improvements in water retention and drainage. The Town has extensive regulations and guidelines that regulate grading and development on hillside lots and the Town Engineer will require drainage improvement plans be submitted prior to construction of any future site development. Mitigation: None. f) Less Than Significant Impact. The development of one new parcel will require the construction of a new septic system that will be regulated by Santa Clara County Department of Environmental Health and be required to meet the current requirements for wastewater discharge. In addition, any new grading on the parcels will be required to conform to the Town's stormwater regulations which include slope stabilization techniques, erosion control measures and stormwater detention systems which should result in less than significant impacts to water quality. Mitigation: None. g-i) No Impact. The property is not located within a 100-year flood hazard area nor is it located near a dam or stream. Mitigation: None. j) No Impact. The property is not located at the base of a slope,is not adjacent to a lake, and is far inland from the ocean. Mitigation: None. Sources: 1, 11, 15,23 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 20 of 34 Less Than 'Potentially . Less Than Significant with = gmficantSigmfican"t No Impact Si , Impact ` IncImpact Mitigation orporation X.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 ❑ ❑ ❑ Q conservation plan? DISCUSSION: a-c)No Impact. The proposed subdivision and anticipated residential development will not physically divide a community as the project complies with the Los Altos Hills General Plan and Subdivision Ordinance, is located within a low density rural residential area, and the subdivision will create two lots that conform to development in the immediate area. In addition,the subdivision does not conflict with any known habitat conservation or natural community plans. Mitigation: None Sources:4,5, 6 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 21 of 34 Less Thant ° Potentially Less Than 34Significant with - Signifiicant Significant No Impact Mitigation Impact Incorporation Impact XI.MINERAL RESOURCES-- Would the project: a)Result in the loss of availability of a known mineral resource that would be of value to the ❑ ❑ ❑ Q region and the residents of the state? b) Result in the loss of availability of a locally-important mineral resource recovery ❑ ❑ ❑ Q site delineated on a local general plan,specific plan or other land use plan? DISCUSSION: a,b)No Impact. The proposed subdivision and anticipated residential development is not within a known mineral resource area and there are no locally important resource recovery sites in the area. Mitigation: None Sources: 5,6,23 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 22 of 34 f " r Less Than r Y _ Potentially Less Than Significant gY scant - h Significant No Impact St i wit impact M•rtgatton Incorporation Impact F 4 .,I Z { XII.NOISE--Would the project result in: a) Exposure of persons to or generation of noise levels in excess of standards established ❑ Q ❑ ❑ in the local general plan or noise ordinance,or applicable standards of other agencies? b) Exposure of persons to or generation of excessive groundbome vibration or ❑ ❑ [J1 ❑ groundbome noise levels? c) A substantial permanent increase in ambient noise levels in the project vicinity ❑ ❑ 0 ❑ above levels existing without the project? d) A substantial temporary or periodic increase in ambient noise levels in the project ❑ Q ❑ ❑ 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 ❑ ❑ ❑ Q or public use 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 ❑ ❑ ❑ Q residing or working in the project area to excessive noise levels? DISCUSSION: a) Less Than Significant with Mitigation. The proposed subdivision and anticipated residential development will be regulated by the Town's established noise standards. A Traffic Noise Assessment Study was prepared by Edward L.Pack Associates, Incorporated(dated July 3, 2015). Due to noise generated from the Interstate 280 freeway, existing ambient noise levels at the proposed building site on Parcel A is 61 dB Community Noise Equivalent Level (CNEL) and 67 dB CNEL for Parcel B. The Town's General Plan Noise standards specify residential noise exposure limits for usable outdoor spaces at 60 dB CNEL(General Plan,Land Use and Noise Compatibility Guidelines Figure 7-4) and interior noise exposures are limited to 45 dB CNEL (General Plan, Noise Element Goal 2, Policy 2.2). Based on current California Building Codes, all new residential construction must comply with a 45 dB interior noise limit. This can be achieved using standard building construction methods and materials. However, exterior noise levels will require mitigation to lower noise volumes to a less than significant level. The report includes mitigation measures for the usable outdoor living areas such as placing the usable outdoor areas on the west side of the proposed dwelling(utilizing the dwelling as a sound barrier)and/or utilizing a six-foot high acoustically effective barrier around the usable outdoor areas. The report maintains that all parcels with future buildings can be mitigated to an acceptable level for both interior and exterior noise. At such time when the future homes are built a noise report will be required listing any mitigation measures-necessary to reduce the noise levels to an acceptable level. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 23 of 34 Noise Mitigation Measure 1: The Final Parcel Map shall include a 60 dB CNEL noise line to delineate which portions of the two parcels are impacted by existing freeway noise. The 60 dB CNEL line shall correspond with the line shown in Figure 1 of the Noise Assessment dated July 3, 2015. All future residential development on the parcels shall require a noise analysis of the proposed usable outdoor areas to determine if they meet the Town's noise standards. b) Less Than Significant Impact. The development of the property will require grading the side along with the boring of foundation footings. These impacts will be limited in duration and will not require the driving of piles or other operations that generate excessive ground vibrations. Mitigation: None. c) Less Than Significant Impact. The proposal will result in the future construction of a new single family residence on the new parcel. Once development is complete, day to day living will produce noises such as vehicles and air conditioning units. These types of noises are typical within any residential neighborhood and would not result in a substantial increase in ambient noise levels. Furthermore, the Town requires new residences,swimming pools,pool equipment, and air conditioners to demonstrate compliance with Town Noise standards. Mitigation: None. d) Less Than Significant with Mitigation.Construction noise levels associated with subdivision improvements and future site development will likely periodically exceed the ambient noise levels (approximately 60dB) in the project vicinity. These noise impacts can be reduced to a less than significant level by adherence to Town regulations on hours of construction. Noise Mitigation Measure 2: The applicant shall ensure that noise generating construction activities are limited to Monday through Saturday between the hours of 8:00 am and 5:30 pm. No heavy noise generating equipment is allowed to be used on Saturdays and no construction is allowed on Sundays or holidays as noted per Chapter 7, Sec.5-7-01 of the Los Altos Hills Municipal Code. e) No Impact. The project is not located within an airport land use plan. Mitigation: None. 0 No Impact. The project is not located within the vicinity of a private airstrip. Mitigation: None. Sources: 3,5,6,20 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 24 of 34 ess:Than • Potentially Less Than { Si'nificant with g._ Significant = � , Significant No Impact Im act Mitigation Im act P: Incorporation e p XIII.POPULATION AND HOUSING- Would the project: a) Induce substantial population growth in an area, either directly (for example, by proposing new homes and businesses) or ❑ ❑ ❑ indirectly (for example, through extension of roads or other infrastructure)? b) Displace substantial numbers of existing housing, necessitating the construction of ❑ ❑ ❑ Q replacement housing elsewhere? c) Displace substantial numbers of people, necessitating the construction of replacement ❑ ❑ ❑ housing elsewhere? DISCUSSION: a-c)No Impact. The existing property is currently developed with two housing units. The subdivision will result in the creation of one new low density rural residential parcel with no increase in permitted density. This level of development was anticipated in the Town's General Plan and therefore will not have a significant impact on population or housing estimates or induce additional population growth. The number of housing units will not change nor will residents be displaced as the owner of the property currently lives on-site and will continue to reside on the property. Mitigation: None Sources: 2,3,5 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 25 of 34 Potentially Less Than Less Than ., Significant with I m Pac�fi nt Mitigation , ca Significant No Impact r t Impact Incorpo anon r . . XIV.PUBLIC SERVICES--Would the project: 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 ❑ ❑ Q ❑ 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: Fire protection? ❑ ❑ Q ❑ Police protection? ❑ ❑ Q ❑ Schools? ❑ ❑ Q ❑ - Parks? ❑ ❑ Q ❑ Other public facilities? ❑ ❑ Q ❑ DISCUSSION: a) Less Than Significant Impact. The subdivision will result in the creation of one new low density rural residential parcel which will require public services. However, the potential development of the new parcel with a new housing unit and potential second unit is within the permitted land use density and consistent with the type of development that was anticipated in the Town's General Plan. In addition, the General Plan states that the Town has adequate fire protection, police, schools and parks to accommodate anticipated build-out of the community and there are currently no service shortages in the community. Mitigation: None Sources: 5 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 26 of 34 . Less Than - Potentially Less Than Y` s Significant with Significant Significant No Impact Mitigation - Impact} Impact Incorporation XV.RECREATION--Would the project: a) Would the project increase the use of existing neighborhood and regional parks or other recreational facilities such that ❑ ❑ ❑ substantial physical deterioration of the facility would occur or be accelerated? b) Does the project include recreational, facilities or require the construction or expansion of recreational facilities which ❑ ❑ ❑ Q might have an adverse physical effect on the environment? DISCUSSION: a,b)No Impact. 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 prior to recordation of the Final Parcel Map. Mitigation: None Sources: 5,6 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 27 of 34 5 - P▪ otentially Less Than Less Than Significant with ▪ Significant Significant No Impact tigation Impact MiImpact Incorporation XVI.TRANSPORTATION/TRAFFIC— Would the project: a) Conflict with an applicable plan, ordinance or policy establishing measures of effectiveness for the performance of the circulation system, taking into account all modes of transportation including mass transit and non-motorized travel and relevant ❑ ❑ Q ❑ components of the circulation system, including but not limit to, intersections, streets, highways and freeways, pedestrian and bicycle paths, and mass transit? b) Conflict with an applicable congestion management program, including but not limited to, level of service standards and travel demand ❑ ❑ Q ❑ measures, or other standards established by the county congestion management agency for designated roads or highways? c) Result in a change in air traffic patterns, including either an increase in traffic levels or a ❑ ❑ ❑ Q change in location that results in substantial safety risks? d) Substantially increase hazards due to a design feature (e.g., sharp curves or dangerous ❑ ❑ ❑ Q intersections) or incompatible uses (e.g., farm equipment)? e)Result in inadequate emergency access? ❑ ❑ ❑ Q f)Result in inadequate parking capacity? ❑ ❑ ❑ Q g) Conflict with adopted policies, plans, or programs regarding public transit, bicycle or ❑ ❑ ❑ Q pedestrian facilities, or otherwise decrease the performance or safety of such facilities? DISCUSSION: a-b)Less Than Significant Impact. The subdivision will create one additional residential parcel. The project conforms to the land use and density designations in the General Plan and does not conflict with the Town's recently updated Circulation and Scenic Roadways Element. The Town does not have a Level of Service threshold for the circulation system, however,the roadways in the surrounding area all operate at a Level of Service of B or better at all times of the day. The addition of one new parcel will only result in 8 to 10 new trips a day which will have no significant impact on the existing circulation system. The minor increase in traffic is not anticipated to create traffic congestion on existing local roadways. Mitigation: None. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 28 of 34 c) No Impact. The addition of one new residential parcel and an estimated 8 to 10 trips a day will not change existing traffic patterns nor result in traffic delays as the street system can easily accommodate the new vehicle trips. Mitigation: None. d) No Impact. The new driveway for the new parcel will be in a similar location to the existing driveway and is located near the terminus of a dead end street that serves only six other residential lots. The new driveway will be in a highly visible location on a low speed street. Mitigation: None. e) No Impact. All new residential development is required to provide adequate emergency vehicle access. This new parcel is located on a public street with more than adequate emergency vehicle access. The driveway to serve the lot will not exceed the back-up requirements of the Fire Department and will be visible to emergency personnel. Mitigation: None. f) No Impact. The new parcel is large enough to accommodate the minimum required parking for a single family residence and adequate parking will be provided during the Site Development Permit process. Mitigation: None. g) No Impact. The project conforms to the land use and density designations in the General Plan and does not conflict with the Town's recently updated Circulation and Scenic Roadways Element. Mitigation: None. Sources: 1,2,3,5,6 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 29 of 34 • r t Less.Than r Potentially S� nficant,w►th Less Than -. Significant g Significant No Impact Mitigation I_mpact Impact Incorporation XVII.UTILITIES AND SERVICE SYSTEMS— Would the project: a) Exceed wastewater treatment requirements of the applicable Regional Water Quality ❑ ❑ ❑ Q Control Board? b)Require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities, the ❑ ❑ ❑ Q 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 facilities, the construction of which could cause significant environmental effects? d) Have sufficient water supplies available to serve 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 project that it has adequate capacity to ❑ ❑ ❑ Q serve the project's projected demand in addition to the provider's existing commitments? f) Be served by a landfill with sufficient permitted capacity to accommodate the ❑ ❑ ❑ Q project's solid waste disposal needs? g) Comply with federal, state, and local ❑ ❑ ❑ Q statutes and regulations related to solid waste? DISCUSSION: a-g)No Impact. The proposed subdivision and anticipated residential development will not have a foreseeable impact on utility and service systems. The Santa Clara County Department of Environmental Health has approved plans for a new septic system and leachfield on the new parcel and any increase in stormwater runoff will be captured on-site in a detention system to protect downstream properties and increase infiltration of water into the ground. Water will be provided by Purissiia Hills Water District which has no restrictions on new water connections. Landfill capacity is adequate in the county to accommodate projected residential growth in the area. Mitigation: None Sources: 1,2,3,5 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 30 of 34 f " Potentially Less.Than Less Than S Snficant with ignificant •igiSignificant L No Impact Mitigation Impact Impact Incorporation XVIII.MANDATORY FINDINGS OF SIGNIFICANCE--Would the project: 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 ❑ ❑ Q ❑ levels, threaten to eliminate a plant or animal community, reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? b) Does the project have impacts that are individually limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project ❑ ❑ ❑ Q are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)? c)Does the project have environmental effects which will cause substantial adverse effects on ❑ ❑ ❑ human beings,either directly or indirectly? DISCUSSION: a) Less Than Significant Impact. The proposed project,as mitigated,will not result in any significant negative impacts to the environment,fish or wildlife species,plant or animal communities or historical resources. There are no wetlands on the property or special status species and the property is already developed with structures and other hardscape.Any new development will be located in approximately the same area as the existing development. Mitigation: None. b) No Impact. The proposed project does not have any foreseeable individual impacts that would result in a cumulatively considerable impact. This project will result in one new residential parcel located within a residential area at a density that was anticipated in the Town's General Plan and in other adopted regional plans. The impacts do not meet the thresholds of significance for air quality,traffic or greenhouse gases. Mitigation: None. c) No Impact. The proposed project will result in one new residential property which will be developed with a new single family residence. The impacts to the environment are less than significant with mitigation,will result in no toxic or hazardous emissions,and the proposed use is compatible with existing uses in the surrounding area. Mitigation:None Sources: 1-23 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 31 of 34 MITIGATION MEASURES INCLUDED IN THE PROJECT TO AVOID POTENTIALLY SIGNIFICANT EFFECTS: Biological Resources Mitigation Measure 1: New landscaping on the lower portions of the lots shall consist of native plants and non-native invasive plant species should be removed. In addition,utilize wildlife friendly fencing to the extent practicable,particularly between Parcels A and B and along the northeasterly property line(area closest to the freeway). Biologic Resources Mitigation Measure 2: Prior to recordation of the Final Parcel Map,an open space/conservation easement shall be granted to the Town over the lower portion of both lots,encompassing the narrow portion of Parcel A and the steeper slopes of Parcel B. Within the easement,no structures shall be permitted, grading shall be limited to the installation of a septic leachfield and/or stormwater detention systems,retaining walls are not permitted and fencing shall be wildlife friendly. The Open Space Committee shall review the easement language and area prior to recordation of the fmal map. Cultural Resources Mitigation Measure 1: 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 Coroner or the County Coordinator of Indian Affairs if the remains are Native American. Geology and Soils Mitigation Measure 1: The Monte Vista Fault line and a 40 foot building setback line from the fault shall be identified on the Final Map and the existing house on Parcel A shall be removed prior to recordation of the map. Noise Mitigation Measure 1:The Final Parcel Map shall include a 60 dB CNEL noise line to delineate which portions of the two parcels are impacted by existing freeway noise. The 60 dB CNEL line shall correspond with the line shown in Figure 1 of the Noise Assessment dated July 3,2015. All future residential development on the parcels shall require a noise analysis of the proposed usable outdoor areas to determine if they meet the Town's noise standards. Noise Mitigation Measure 2:The applicant shall ensure that noise generating construction activities are limited to Monday through Saturday between the hours of 8:00 am and 5:30 pm,No heavy noise generating equipment is allowed to be used on Saturdays and no construction is allowed on Sundays or holidays as noted per Chapter 7, Sec.5-7-01 of the Los Altos Hills Municipal Code. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 32 of 34 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,2006-2007 8. State Department of Conservation,Farmland Mapping and Monitoring Program 9. BAAQMD CEQA Air Quality Guidelines: Updated May 2011 10. State Department Fish and Game CNDDB Map 11. Santa Clara Valley Water District Map 12. Geotechnical and Seismic Hazard Zones Map of Los Altos Hills,Cotton Shires and Associates,December 2005 13. DISC Hazardous Waste and Substance Sites List, California Environmental Protection Agency 14. Wildland Urban Interface Fire Area Map 2008 15. Federal Emergency Management Agency,Flood Insurance Rate Map, Los Altos Hills, May 18,2009 16. Sanitary Sewer Map,Town of Los Altos Hills Engineering Department 17. Santa Clara County Municipal Code Chapter II Indian Burial Grounds(Title B Division B-6) 18. Geotechnical Investigation report prepared by Richard Rowland,C.E.G.,in 1977,Limited Geologic Review conducted by Murray Engineers, Inc. dated July 18,2014 and a supplemental geotechnical evaluation of the proposed leachfields dated June 9,2015. 19. Cotton&Shires Assoc. Peer Review Letters dated October 22,2014,March 23,2015 and December 21, 2015. 20. Traffic Noise Assessment Study prepared by Edward L.Pack Associates,dated July 3,2015 21. Wildlife Movement Patterns Analysis and Recommendations;prepared by Live Oak Associates,Inc.dated June 15,2015 22. CEQA Guidelines,2010 23. Google Earth Exhibit List: 1. Vicinity and Location Map 2. Tentative Map Plan Set 3. Wildlife Movement Patterns Analysis and Recommendations;prepared by Live Oak Associates,Inc.dated June 15,2015 4. Limited Geologic Review conducted by Murray Engineers, Inc. dated July 18,2014 and a supplemental geotechnical evaluation of the proposed leachfields dated June 9,2015. 5. Cotton&Shires Assoc. Peer Review Letters dated October 22,2014,March 23,2015 and December 21, 2015. 6. Traffic Noise Assessment Study prepared by Edward L. Pack Associates, dated July 3,2015 Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 33 of 34 Mitigation Monitoring Program Lands of Gera File # 51-15-TM-IS-ND Mitigation Measure Responsible Must Be Done Department Completed By 1 Biological Resources 1: Planning Approval of New landscaping on the lower portions of Site the lots shall consist of native plants and non-native invasive plant species should be Development removed. In addition,utilize wildlife Permit for New friendly fencing to the extent practicable, Dwelling particularly between Parcels A and B and along the northeasterly property line(area closest to the freeway). 2 Biological Resources 2: Planning Prior to Final Prior to recordation of the Final Parcel Map,an open space/conservation easement Map Recording shall be granted to the Town over the lower portion of both lots,encompassing the narrow portion of Parcel A and the steeper slopes of Parcel B. Within the easement,no structures shall be permitted, grading shall be limited to the installation of a septic leachfield and/or stormwater detention systems,retaining walls are not permitted and fencing shall be wildlife friendly. The Open Space Committee shall review the easement language and area prior to recordation of the final map. 3 Cultural Resources 1: Planning During Grading Upon discovering or unearthing any Operations 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 Coroner or the County Coordinator of Indian Affairs if the remains are Native American. 4 Geology and Soils 1: Engineering/ Prior to Final The Monte Vista Fault line and a 40 foot Planning Recordation of building setback line from the fault shall the Map be identified on the Final Map and the existing house on Parcel A shall be removed prior to recordation of the map. Town of Los Altos Hills Initial Study Lands of Gera December 15,2015 Page 34 of 34 5 Noise 1: Planning Prior to The Final Parcel Map shall include a 60 Recordation of dB CNEL noise line to delineate which the Final portions of the two parcels are impacted by existing freeway noise. The 60 dB CNEL Map/During the line shall correspond with the line shown Site in Figure 1 of the Noise Assessment dated Development July 3,2015. All future residential Permit Review development on the parcels shall require a Process noise analysis of the proposed usable outdoor areas to determine if they meet the Town's noise standards. 6 Noise 2: Planning During The applicant shall ensure that noise Construction generating construction activities are limited to Monday through Saturday between the hours of 8:00 am and 5:30 pm, No heavy noise generating equipment is allowed to be used on Saturdays and no construction is allowed on Sundays or holidays as noted per Chapter 7,Sec.5-7- 01 of the Los Altos Hills Municipal Code. 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O ' TELEPHONE CO. ."I �,� * .,--7".11-"53,04-7175-----.. - RO/tD, '-��.I .'yr-- BOJ qC '1_6 Or TOWN OF LOS ALTOS HILLS i Mf')"I .4D7 h..` ,sx '" raas, ,," • ...z...‹.--47N. ' 1076 Ac , to :? -a. ri.a ,n 6'1,4 far�2 --ze,u a `4.31 10.?O AC NET. r 92 " N I ter. ; 9 i' ..� r°', Igs_ t7, 2Or'a PCL 8 6., PCL A �{: ZT AC `? 4r 'c 3 27 Y 9\ 1.47 AC PLAN 1.40 AC.RAN p \? 1$ 41 O •r 64 . �,,./ 5r s' Z 3 JUNIP >.m n: --- < r= ERO br3./ Tr/.7 N,ar .bT,. c'rr1 ' 2/ 5 Ip 1032 Ac 0 1.1 Iaera R.O. S. 665/12 SERRA ..'�NORCA Cr ° A/ 14 28 r I G1i 4 W.1e 1 n• nce t.9_'K„ g I 11.92 AC. NET A �a 1 „ `-h_+'.' re_n n i B6 1 1.65 AC. NET I 1.27 AC.NET. •-.{, ansa ``i4 f'' on,.r„r aco • I MS, FRF I 88 rsrs-3n , 89 31 $ °°7 3 F ; 44 43 42 a1 41 A7r .. w Y 1 -7740£1.E/aa 40- "15'.p -27{M ELENA RD/ Ill \--- 223 I . . ..-�,7-1: .T ' 't -'-ITl- �'se 1241:09 \ eo r 1 7.00 A[. 4 2 Z • r.>F' _1„IS ) 1 1 �� 1.71 AC i 136 AC. 11.3OAC. 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BENEDT @ LOT Z PER 1 \'� K--"` '% / (a63 uAPs s.) 1 (�SOµ191- T'a 94022 V's b.Ym .7... \/ / I 1 ty.u-4l-t RENT 3 L-F.DD OF Matt OPAL ENGINEER: IFA&BRAZE ENGXEERIN4 NC. T EASEMENT.1.V0 > .p�° "'006EEY°E°i TM D..43.• Ie= -0.3 CD6.1.3 LOT 3 1 lI '1 2405 HATMMOu u 81515 PARKWAY KS i'11...,,,,,...... ,..-'4T.',1 CR DEDICATION i uB3 Mf APS J1) I.14... wrs w TRACT'PDD.6763 1 1 . (00)007-1046 °`'� A -- 463(HAPS 04 ` W 5 *` / I/ 1 11 !E , TOPOGRAPHIC suR\tl:TOPOGRAPHIC ENGINEERING.INC. I //- 2105 INDUSTRIAL PARKWAY WEST B'e -1.:" NR,15.2? N51T5D3E' 00]95'. -S 1 1•J - .i 1- HAMAR°•G 01545 Z ¢BQ^^ TEL(510)Bel-1006 g�S-" 4 l y O 114, V`' / TI+-, 1 ) UTILITY COMPANIES f '• t .1 .R 2/D: I ' P E � E)PO. -;T\.f_ }-e --- I'•r \4 F D.`'1 \ I i 1 k 11}. s ORAN TOWN L ALTOS SANTAEZNU) 00 l'A.T.cli /q', y `q 1 (TO BE RELONA) 1 A&':`..7.'''''''''';''''.-] P00.NWSE•' 1 i 4 1 1 1 E0FC1IRRICAL• MOOGG GAS D CL00050..FELLS WATER DISTRICT W ,.r < O / ,1,,,,,e.,..-Loo..,Ir •,'RIBS NELO\tV' TO.R[YAIN..Y. 5 -- 1`• 30•'SEIBACO I l 1 + I 1 ) ( GAS PACIFIC GAS AND ELECTRIC ¢�¢ r 0 V (ro BE RCYOVEO).. \ I I 1 1 PHONE AT&T 5 u qF Y 'a1 I _, .--."..".-1-.--,:'0,'./74.,47-..:.;';,7n ., - .(0)PATOS• f I N j \ H. (E)DR-• 7 i 1 1,'+ CABLE =CAST co 3 ''..T.00KPA05 1 I(TO.0.) .'It 1 u Cp 0uJ ,.JJa + I 1 NOTE NEAREST SEVER AT GREATER THAN 3W FT DISTANCE 80 g � l�(To eE REuovE�. _ 1 `I 1 3 < 's uA' ^ ?..v!7'" - �, tta%/Q a.. ,!- ( '�• Ir-;- 4. \ EXISTING SITE DEVELOPMENT INFORMATION Dsp 2m 5 �_•e�®yy',,� f-t E- , \- L"% �''` . tm' REvrnm) I 1'1 1 1'A i-, PARCEL 1. PROPGSTD USE R-1 ..: g .../ SiT.a�V/ r I rc-) / 1" 'Y .. ) (ro PIAN) 1 �i• i 1 , 1 1 1 AREA(GROSS Res ACRES(12.1.]!1 S.F. 4 gym..:__ / t - 0./ 1ik- 4.Y .� I I 111 .1',\ 1 iG : / Sit ::'..' 3 �Y % 'P'12,4..'-'1, :-.''.4 • t [N PWS p 1 1 II ',I I i i t , l\,1,•.•‘t.. BASTIN (NG ERT.)aw.EASENEM DEDICATGN:0.000 AGKB(0 sF.) / jj�/ +'+I' -p .1< j. ALK Ap - 1 •� �+ I i I 1 , I :1 tI(1 YERAOE SLDPE 26s ACIE9 13 Zll SF.) ^ NAY Lv D.7 I 1<. (ro REMAN) ....,.'-'-. 0.,;-:: I I t 1 1 1 !ill 1 1 , 1 II '1 II'1 LOT UNIT FAMINE ziza A ]0.00• I / / ]0- ,.:•,y ' *!...,,,,,,_,,,,t4...--1,-.,Y iv 'A , t I I , . II'•\ 1 , ALLOWABLE uDA 24101 S.F.,M ..TB 17' /j% '�• _._3,1,.:,,, ) 1! 1 1 I • , \' AIyOwABLE YEA: 12.4E SP. Ir.;r r� .7 D.Sn6^6 _/j j\ • {' j..,� u • kA 1 (70.7.14. A 1'II\ , f� � `j: Ter' •-RELNMO- =51.^11 I I. AIc I I1 1',1• PROPOSED SITE DEVELOPMENT INFORMATION O § // PMOL A ZONINGOS R I-1 1 i / -\� s. .. I 7--r- /j/ , (- ? F P w Y &.,P 1.-'a''-'W a PARCEL& - 1 1!1 \ 'tk PROPOSED (GROSS 1.14Acpss.. 2.557&F. cn a /, /// / t • .Pa0D0;Ep - ( i 4 NNRE R.O.W.EASEMENT DEDIu11GN: OM ACRES 517 ss-) d ,,,. /4� -i......... . .,' %1%GKer, � ,. �ENMI)i i ``R•: 114\I .. • nAu UNITFuA 1524 (t .N /( fm UNE (?G �. GROSS.BA 874 SQFT 1 42.ACOE (NETX a AcR s(MOTO ss. U PZ�1 i� •\I\\ .dam II ""I % DRr7EWAr To-e N '" 81008 SBFT 1%l O,AFnfRE 1 \ A q_ z L '6'D. Y ; LOT UNIT sOPE, 1.1100 SF. 4 V fi L •1 pROroS[0 Lor NE ��\I 1r :X ALLDWAB E YFA T,06e S.F. p'"•,O O I \\\,,'• A(WALK Y$'e Ras AP ' 6 L r �� i , I i ,+ 1 v T i I ,R I,., I(Q F,CT. \ '(IMT 4Fl R€110VFD) ' f 1 i t T /t I I• 1 1 i PMOL B: ZONWG R*1 I r{ {il 1 z PROPosm USE C5 \ \ I' r C 41, ) I"{'J�r L .•''''1'% i ' OT 2i/ I' I 1 \,•,'.g.'..', w 1 Mu(GROSS k 1.42 ACRES(61,071 ss. ,4 d v'1,,,. R r 4'; IT,t•- I 47 r QEµ F URE RD.W EASEMENT DmrcAToc 402 ACRES(449 S.F.) \.•.... '6. -(Td BE R040 00) ((E)(1000 DECK - + o4 0)3 6783•! `il ++ 1Y PRoP(NEO: 1.w AQffs(el.aoe SF. w U 1 �� I'I�\ I[. n�" Fi S : (ro:BE'REYOND) /By N 64' / 1 1(�i vEAAft SLOPE ._.: A U d'u) 'D. I -' ` TYPE i 'TSO I ,' i y\ LOT u0rt FACTce' 1.mJ Z C.-j O E ' Al10WMLE YEA: 1451E . 1 ` I 6 • f FOF P MEA 2 iZDiY�dQC'P, 1. i •I 1\' AEAwAB E MEAL S. S.F. Q .] 1 \\ V_ _ - i 1,, .. key 32r'�sORD31 Za \ I y,R , ,..LL_i 1 1B5 ACRES tl I 1.1\ • ' '_ 1;11 1 1 L Ts DO LOM �' % -'`',.c.'T 1 40H1E VISTA FAULT`\\\ I 1 groMLONG f / /, '% ` ' [S•. - v. Z. L:•2:)G E,LT�Y.;IA.TH 44 cONTAcT. �\'-'-' 1. .I H'''''11'"' ' 0 .1.N.:' .%, , ,."PROPOSED LOT IRE•/ , I 11 ir- u P:+o�it2,s ) O .f'0 Y 4-f7 _)-1�.g,.�., RBS ME {� � II 1 Twt 3"vf3 co ..,.Val.t.. _. uPIHRORRNN Sof of \\ I 1/ ;'SETBACK / I. ', t s.TS'i6E 5 LAMM OF C-. M0 FALLT. qq,_-10\/1 1 ZONE t t '' e\'` '• . I ,1 1 WAVERS � Q' 11 ,,.. / \ 2.s•BU60wG / ` ' /PARCEL A % ,' 1 i 1 FEMA NOTE I 5!1900(0000E PTI •% 1 , i /' N.• •, 1 /GROSS. 62.557 SQFT/ 1.44 ACRE 1 \, Cl } \ ! / %' NET: 62.010 SQFT 1.42'ACRE , 1 Y \, PEA 100E NATdAL 00000 NSLRMCF PROFAAM(NM),FLom VIAIRINCE (� 1 (14J MAPS 31), //', ' , t / 1• RATE YAP,YAP NUYBEA S..MSO.105,SMTA CLAM COUHIY.CALFCRNIA [DI I PO ENTI L\ \ T� / f j A ZINE L NOT DOM MAPPED FLOODPLAIN THE CON9DD SITE 6 W ›. RUPNRE 2000E \ t '1 1 _ 1 I�(14J YAPS s.) \ N:RI. \ 1 I'1,i , t i r' - _ . U7 1 Z5 BUDDED 1 , \\ rl / I 9 T' COSTING IMPROVEMENTS TO BE REMOVED•uNIEss°GERMS.NOTED. w E. \_____________V�-SETBACK UNE PER��. \\ 1 r1' i t f' 1 4,` .,..Ix 1' 1 (113 YAPS 51) \ \\1 t f 5to C 1 1 \ ``I U 7 � aD g eAa sE a"G ` 11'(L C.EH"' LOT ` �. O I 1 TRACT 0)0 0763 ; j , E / 11; R'i \1 E l I IT ni atcy. R R E� ✓< ,, I ' I , i t 1 1 l N!5'a9 IO-w 1 1 1\I 1 Il J IZy �_ I Fr\. V�. 1 r•. T ', 7 IN51•wb]-�r -'I`-,-I)7] _ _ r j A cA - r E% • l0NN uvD .x. cA O6, .i:s 1,4 -t EBF; '•,••."-i ((( na cA pc.D ,f BOT 1 LARDS OF ODU "V=ur a TRACT NO.2:.'21 ', •,AATI'2Rg cr REWSpNs By CO(HAPS 1 re?.7177-S-4.-01"44 127ALI n ,./'!�, a2:21' .NOB No- 214.4 NOTES BENCHMARK • EASEMENT NOTE SHEET INDEX �\ I! DJj N,` DATE 00/01/00 ALL DISTANCES D 0YEN5IONS ARE TI MM OF LOS ALT05 HILLS BEN0IYARIF W SITE BENCHMARK A CURRENT AAE REPORT FOR THE SUBJECT C-I PROPOSED SUBDIVISION LOT UNE EXHIBIT 00A0 1--m W FEET MD DE0NIJ5 OFA FOOT. LOCATED Al TME NORTHEAST CORNEA OF PROPERTY WAS PROVIDED BY DR5T C-2 PROPOSED PARCEL A DEVELOPMENT INFORMATION EBNA ROAD D LA BARRMu ROAD. SURVEY CENTRE_PCM AYEA CM OILS COMPANY GOER N0. DENG.BY: Rn •UNDERGROUIO IIiIUTT LOCAADN D.IS OS/DDI FEET'AST OF'A EIRE HYDRANT YAG MO SHIN00 SET IN ASPHALT 1101-2I00023,0AICD:YMG B,2007 C-3 PROPOSED PARCEL B DEVELOPMENT INFORMATION 9 BASD 0100 SF6Ax EVIDENCE ON A UNE ERG+THE FH NO STREET SEAN AND EIEVATIDN.4%4.0.(NAV-Ba) AND HAS BEN=FARMED BY IFA&BRAZE C-4 PROPOSED SUBDIVISION PARCEL A AVERAGE LOT SLOPE DRAVM BY: RN SEVENTEEN FELT NORTHERLY CP THE CENTERLINE E ONCERM4 W0.All MOM EASEYENIS C-5 PROPOSED SUBDIVISION PARCEL B AVERAGE LOT SLOPE SHEET No- GIMING FOOIRGNTs ME 6 LA BMRANCA BM IS A ALUYWUY DM(SET ASEE UN THE PRomDED ARE REPORTED C-6 PROPOSED SUBDIVISION SLOPE>10%EXHIBIT D 10 00 1G SHORN AT GROUND LEVEL ON A 1'POET PPE SET W°NORM. HAVE BEEN PLOTTED. ELEVATOR-141.14'(NACU eel 1 4 RCM FLOOR ELEVATIONS ME TAXER VICINITY MAP S... AT DC.THRESHOLD(MEM.) SCALE: V.20' 00'SCALE W a00 SHEETS • e NOTES EASEMENT_NOTE BENCHMAiIN SITE BENCHMARK a ALL ET ANSI NIB LS OF A F ARE A PRETIT TIME S FRO ED THE FIRST TORN D ADS E NO HEAYAc AND SHI EA SET IN ASPMAL.T ETJyAndl.1)1.01'(ALAR m)T CN.„,.. \:....7111A. e�1ttAMC WC ALL NNOIVN FJ\SELENIS SCVEIIITIN FFFf NtlIINTALY BF 111E CDITEAUNE _L_ \�!:�,-�OCEANS Ta01PR1N19 ARE AW)oN THE PRONGED TO E RCPoRTED OF IA 9MRANCO BY ISA ALUMINUM 019(SETII 0 J'1\\,rj SHOWN AT CROUNB LEVEL ON A 1'MON PIPE SET IN 0)NCRETE. ., 'L "•".1.:11 1 ELEVATION.401.16.(NAVO 00) )PAT ROU(EEEVATCNS ARE TA/101 II�`- AT DOA 11Nf91mo(E%IER16t) < 1 mn / : ....y MUFF CENTERLINE of 1' 1 ,11 {{gin 5 `oa1l EASEMENT FOR THE 1 1 1 a 1 10 40 .A o n PROPOSED 10 :/,.....,,.;.f'' s:- _/ BENEFIT BF LOT I PER 1 `1 '1 I +..� I 1"S 1 v; m a R.O.W.11Y q� .- I NT MAPS 54) 1 1 V, Ll/.Y I E.�u�w)11-M2.1 1 1 1 SCALE: 1".20_' afl •5'.acW EASEMENT . o PALM am1 1 \ VICINITY MAP „��_�-� A6EEA C T�-M„ \Sa_t'e LOT 3 1 DEDICATIO r '1 / ' 1(1iYIMATrsIs e1) 1.454 As t xo SCALE ISI g R r (' -Katt M.ares 1 1 m Y 3 ,; �,, l I/ )_.-- 433 TUFT,su 1`I`, .(,.,r,E,ID:.I g ranm '-i s°-I1..-•l_4- "_ I ,TI;�1 ;.' 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PROPOiT' AS PROVIDED BY FAST LOCATED T THE NOAHEAST CORNER OF YAC O SANER SET d ASPHALT SYSYC ARMCO/Ti1E COMPANY ORDER N4 ELENAROAD AND IA BARRANCA ROAD. EILVATOE-474.02'(HAW DB) UNDERGROUND UTILITY LOCATOR 4101-x40802;DATED:YAR.D.2007 BY IS SIXTEEN RET REST OFA FIRE HYDRANT / �I 411FR 6) IS BASED ON SURFACE EVIDENCE AAD HAS BEEN%YARNED BY EEA•BRAZE M A TINE FROI1 THE FH AND STREET SOI AHO ENONEERING INC.ALL KNOWN EASEMENTS SEVENTEEN FEET NORTHERLY OF TIE CENTERLINE \ OW , M„1-11 BLIADINO FOOTPRINTS ARE BASED Oi THE FRONDED DILE REPEATED OF LA BARRANCA RN IS A AUMNUY OCif SET .WRY AT GROUND LEVEL + OI A E•IRpN PRE SET N CONOiETF. i \ _�_ CT ^ T,C ANI9R FEDOR RESHTONS ARE TARN / t7S'AITON-484.18'(NAND BD) — — ^ ..11£i RW, yy,°,,.•4”' AT Doo.THRESHOLD(FIt1i)Oc) f PARCEL B U %-�y I i •'/ _ 1%1,1 D 350' F.;. o a /' .y. / �— ��` 1 1 AREA= 54,524 SOFT -` °�o4XR ._tj. ---.2 �' NT➢RC CElRIERLINE OF f / D 1D xo w \ 1 1`i(7.25 ACRE) _ a 7x:' PROPOSED 10' <<' •iI/ bII1 EASEMENT FON TIE - / I ` \ �7 4 FUTURE CE TER 2 POR I ,,,/,•,?.;!! f1r 'I / (48] APS 54) / \ 1 • a ]^14 u 2 R.O.W.=`± ?�,,; � � // ., c.^. scALe ^.za \� 1\ cD �Mn..E EASEMENT I, D Pu`uc unuT / �-a' \ 1b 3 -i [A [NT / A+8_102x-4?.4s'GL) LOT 3 \ 1 ` Y; VICINITY MAP A=- DEDICATION 7'- / Eh 1 a (LID] S N) \ 1 ND SLUE Q u ' "' TRACT 7b.67e5 F` ,-r. /v .I I/ 1 // ...-M 443 NUPE 64 \� ; :,I-_:R , m �� y •'-�-{'''" f I .Ns.Ts2eE • N54Ts•2B•r. w.B]•. ]s.rc. r___ __4•1.11 s yTA.- NOTE: s'Afi=,X : '` --'` -w Dp ,t - _ . 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E0224A ROAD AND LA BARRANCA ROAD. E.EVATON-474.01'(NAND GB) • 4 UN ABED OIMO MITISURFACE LOCATON 4101-2468021 DATUM DYMARC.q 2007 011 IS 100 FOO FEET NEST Of STREETA EWE 500HYDRA/Cr xONAcxLL r.l k IIFA�Lal R BASED W SURlA(2 ENOFN� ANO NAS NFOI il(AIU.0 BY LEA!BRA1E A RINE 7FRCN001 TI!M MD NItMEN AND 'tq.M-1116 i(r DATED O1 T TNG 00 0NOWN E801070 4 OF.BN FEES NO Il ISA' OF T{E CC" SINE lll�� BUILDING FOOTPRINTS ARE SED ON THE PRONGED 1111E REPLAfED K U BARRANG BY O A ALUILMIY DL9f SET u\xI.NnIx.1,200,111.r,A.A,AIO.x A,nucN.111.1..u 4AM000 ,. SNOMI T GROUND LEVEL ON A r IRON PPE SRW w OEIE .. �i ry..•trI El2VATCN-484 (w ) ]h01•I.011 0.1•4110.1 i1M5NBOOR RESHOL0(AREOR) 4An LxL.1,Mn1. ry.v:+�::.a,....e'I.A u...lu.xhJ11 I..4:11/4. Cj AT DOOR THRESHOLD(EcmOw) a C5 _ J .Y�/ I '( LrL�Y,n,nm n,„rNALL.l OrrITAIA x11111.,4.NA.m,,xu u1014.4un,rAuv-,111001 0 11osRaR PZ! %.I/( ..�I FUTURE CENTERLINE OF 41 \ 1 .. 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JAN , �i� Y I'' � � O %�/i,,„�•'>'�` , ayr pea r� , •k//',/',/,`,//r ' �!P 1 \\_> 1 >/ C,r r / y,4 ASR ,�' /';op.:./,>%' , //,/','`;r,' ,..'n K 'I 1 c.\`\`i-.1:m , •,, ' ' /� /•!,>1,,,-T '''.. ,,, /r ,'/„i. !', .4.,!//,,.."24,7'''.,,/,/ /Y14�- O C^ 7. • ,1._ \\ . /I /49% • LIVE .OAK ASSOCIATES, INC. A an Ecological Consulting Firm RECEIVED June 15, 2015 JUL - 7 2015 Cynthia Richardson Planning Consultant TOWN OF LOS ALTOS HILLS Town of Los Altos Hills. RE: Analysis and recommendations regarding the subdivision of 12345 Gigli Court and the affect this action may or may not have on local wildlife movement patterns,Town of Los Altos Hills (PN 1946-01). Dear Ms. Richardson: Per your request, Live Oak Associates, Inc. (LOA)has prepared a technical analysis of how subdividing the 2.86 acres 12345 Gigli Court site, would or would not impact local existing movement pathways for native wildlife between the existing and proposed development(i.e., the of the subdivided lot) and 1-280,particularly black-tailed deer'. The Los Alto Hills Open Space Committee explicitly expressed concern that this proposed subdivision could in fact substantially reduce wildlife movement pathways in the region with deer more likely to cross 1-280 in this region,resulting in increased road mortality of deer and endangering motorists (email from Roger Spreen to Cynthia Richardson dated March 23, 2015). Therefore, LOA will evaluate the likely affect of the spatial ecology of local wildlife(particularly deer) from subdividing this 2.86 acres parcel into two nearly equal size lots and the subsequent btildout. For this analysis,we reviewed the Parcel Subdivision Maps produced by Lea&Braze Engineering, Inc. (dated 9/01/14; latest Plan Check 3/31/15). Our primary objective is to evaluate whether or not the proposed subdivision will adversely degrade or constrain regional wildlife movement patterns. This analysis relies not only on the principals as outlined in CEQA,Appendix G,but also the LAH Municipal Code, General Plan Policies, and guiding principals as established by the LAH Open Space Committee. As noted previously,the LAH Open Space Committee(OSC) is especially concerned how this subdivision may constrain movements of black-tailed deer,known to occur regionally. Mr. Spreen(a member of the OSC)noted the findings from a recent study conducted on deer in a 13-mile stretch of 1-280 in San Mateo County known for the high number of deer that are hit every year. In 2006, LOA prepared for the Town's Open Space Committee, a study on regional wildlife movements with LAH and the region, and made a number of recommendations for the Town to consider to minimize the affect of the historic habitat fragmentation that has occurred along the eastern slope of the Santa Cruz Mountain Range since the 1950's and how the Town could optimize continued regional connectivity by adopting policies and principals that provided for reasonable setbacks along riparian or stream corridors and from wetland habitats, encourage the use of native plants in landscaping, advocate the use of wildlife friendly fencing and limit impermeable fencing designs to a"living space" (e.g., associated with the main residence or San Jose:6840 Via del Oro,Suite 220•San Jose,CA 95119•Phone:(408)224-8300•Fax (408)224-1411 Oakhurst PD.Box 2697•39930 Sierra Way,Suite B•Oakhurst,CA 93644•Phone:(559)642-4880•Fax (559)642-4883 Bakersfield!8200 Stockdale Highway,M10-293•Bakersfield,CA 93311 • some other associated structures, etc.), limit the use of outdoor lighting so that it does not adversely affect existing movement pathways,use easements to preserve the most sensitive areas for wildlife, restrict building on steeper slopes; and provide an education/outreach program that discusses theimportance of living with wildlife. To that end.I conducted a field survey May 26, 2015. of the site so as to best understand its relative value for wildlife and as a regional movement corridor for locally occurring wildlife species, and I have reviewed OSC comments. The site is presently 2.86 acres with existing development contained within the less sloped areas on the upper western third of the site. The site ranges in elevation from 476 ft. along Gigli Ct. to approximately 400 ft. at the SE corner. Existing development consist of an existing house, a 2= story garage,pool, shed, and landscaping. Below the existing house(which will become Parcel A) is steeply sloped,undeveloped and has recently been disked with_ two to three stone fruit trees scattered throughout. Below the existing shed in what will become Parcel B is.undeveloped: A 0.015 acres Open Space Easement.has been proposed on the NE portion of Parcel B: The 0.781 acres Lands of Waters parcel (APN: 182-04-010 and not part of this application) is undeveloped:and is situated between the 2.86 acres Gigli Ct. site and I-280; the distance from the project site to I-280 is 75.ft. in.the SE corner to 115 ft. in the NW corner. The Lands of Waters parcel.that borders I-280 supportsa number of large mature oaks and pines. It appears that a 6-ft cyclone fence separates the Lands of Waters parcel from I-280. I'am not certain how far north or south this fence extends. A larger, 2.012 acres Lands of Waters parcel (APN: 182-04-055) borders the existing Gigli Ct. site on its SW boundary and supports house,landscaping and a horse arena downslope from Adonna Ct(Le., closer to I-280). A small vegetated swale(mature trees and shrubs)occurs along this boundary and drains toward I-280): A split rail fence separates the larger, developed Lands of Waters parcel from the project site: There is presently no fence separating the smaller Lands of Waters.parcel that is situated between the project site and I-280.:. Communities along the eastern slope of the Santa Cruz Mountain Range,while fragmented, compared to less developed areas,usually supports large populations of these species, due in large part to the artificial forage that large estate lots provide. For instance, deer in this part of their range are nutritionally summer stressed(i.e., lower quality of forage occurs during the end of the summer). Yet the abundance of landscape vegetation within communities such as the Town of LAH buffers deer from the nutritional.deficit that confronts populations in more natural. areas: In other words, these communities usually support higher populations of deer than would occur naturally. With that said,the existing site provides some limited opportunity for regionally occurring wildlife species of amphibian, reptiles,birds and mammals to move along the lower slopes of the site(e.g.,parallel to I-280. The most significant cover occurs within the Lands of Water parcels that is situateddownslope from the Gigli Ct. site, an area that is more likely to attract species like deer. It is important to contrast this site with that deer study area cited by Mr. Spreen. This study noted that large groups of deer were spending the evening hours near Crystal Springs Reservoir and then moving into areas of significant artificial forage on the east side of I-280 during the morning hours. In other words, I-280 is and was bisecting two critically important locally important resources for these deer. For the Gigli Ct. site, it is possible that from time to time, Technical Letter 12345 Gigli court,Los Altos Hills 2 Live Oak Associates,Inc. deer can and do find openings in existing fencing along this region of I-280. But the primary factor is that significant important resources do not exists on both sides of the freeway in this area and as such deer are not motivated to seek pathways across the freeway. This is evidenced, as this area is not an identified hotspot as is the 13-mile stretch in San Mateo County is identified.The significant cover found along the Lands of Waters site probably already attracts deer to move along it and yet,they are not motivated to venture very often onto or across the freeway in this spot. As with any change in the landscape(e.g., from the placement of a garden shed to the construction of a larger home),the proposed two—lot subdivision will likely result in small changes to the spatial use patterns of a few species of wildlife. The key question is whether or not,this change constitutes a"substantial"affect under CEQA and/or does the project conform to the Town of LAH's.Municipal.Code or General Plan: The proposed subdivision will constrain. the development footprint within each parcel by requiring a 40-ft. front setback and a 30-ft. easement around the remainder of the parcel.. While it is likely the imperious surface will increase,much of this will be retained where existing development occurs with development staying off the steeper slopes: I expect existing wildlife to shift spatial use patterns somewhat, but overall, the limited expansion of the development zone should not appreciably alter these movement patterns. In my professional opinion I do not believe this change constitutes a significant impact under CEQA asbased on my experienceand evidenced by the regional distribution and abundance of deer. Deer:should continue to access this site with similar regularity once the site is subdivided, and any regional movement of deer is likely to continue along the lower slopes of these two lots and the more vegetated Lands of Waters parcel. Other species such as coyotes and bobcats are likely to forage along the same pathway that deer will move. Additionally, there does not appear for this site, to be the same sorts of conditions (the perfect storm)that exists in San Mateo County(i.e., unusually high quality,deer habitat on both sides of the freeway) and as such this two lot subdivision is not expected to act as a factor in forcing deer onto the freeway. In summary;the persistence of populations of regionally occurring wide-ranging species such as deer, coyote and bobcat require areas several times the size of LAH. So while the relatively smalldisturbance from this project,will alter spatial use patterns for a few individuals, this project is not expected to have any long-term adverse impacts:to the local occurrence or abundance of key wildlife species.. This is particularly true as the combined parcels are only 2.86 acres, with the lower slopes remaining undeveloped and contiguous with the vegetated Lands of Waters parcel. In addition to what has already been incorporated into the project based on the plans I reviewed, I would suggest, that the project also integrate a number of design elements that have been identifiedasimportant and useful in enhancing not only the rural character of the area,but also lessening anthropogenic affects on the remaining natural habitats near the site. Namely, • Encourage the use of native plants in landscaping and avoid non-native invasive plant species. • Use wildlife friendly fencing to the extent practicable,particularly between both Parcel A and B-and the Lands of Waters parcel; Technical Letter 12345 Gigli Court,Los Altos Hills 3 Live Oak Associates,Inc: I i • Set standards for outdoor lighting that do not extend downslope, optimizing wildlife movement downslope from the houses; I believe integrating these relatively simple elements into the existing proposed project would conform to the ideas generally expressed by the Open Space Committee and the Town's General Plan. If you have any additional questionsor concerns regarding this Technical Analysis,please contact me at(408)281-5885, at your convenience. Sincerely, Rick A. Hopkins, Ph.D.,_ Principal and Senior Conservation Biologist Technical Letter 12345 Gigli Court,Los Altos Hills 4 Live Oak Associates,Inca MURRAY o Ec [M- 3 ENGINEERS U11 - DEC 1. 4 2015 7 GEOTECHNICAL SERVICES TOWN OF LOS ALTOS HILLS July 18,2014 Project No.2034-1L1 Anil Gera RE: LIMITED ENGINEERING 12345 Gigli Court GEOLOGIC REVIEW, Los Altos Hills, CA 94306 PROPOSED SUBDIVISION, GERA PROPERTY, 12345 GIGLI COURT, LOS ALTOS HILLS,CALIFORNIA Dear Mr. Gera: As requested,we have completed a limited engineering geologic review to evaluate the fault setback constraints that could impact the subdivision of your property at 12345 Gigli Court. As the basis for our evaluation,we have reviewed portions of the geologic report that was prepared for the Gigli Court subdivision(Lands of Gigli),a report prepared by this office for the adjacent property to the northwest at 12369 Gigli Court,and the proposed subdivision plans by Lea and Braze Engineering,Inc. In addition,we have discussed the details of the proposed subdivision and fault setback requirements with the Town Geotechnical Consultant. SITE DESCRIPTION&PRIOR GEOLOGIC INVESTIGATIONS The approximately 2.8-acre property is located on the east side of Gigli Court. The site is developed with a single-family residence located near the front of the property and a pool, pool house,detached garage,and out-buildings located to the north of the residence (see Figure 1, Site Plan). The residence is the original Gigli residence that was present prior to the original subdivision in the late 1970s. In 1977,as part of the original subdivision of the Lands of Gigli,Richard Rowland,C.E.G. performed a geologic investigation to evaluate faulting. As part of his investigation,Mr. Rowland reviewed pertinent published and unpublished geologic data, reviewed a single set of stereographic aerial photographs from 1972,performed a geologic reconnaissance of the site and the surrounding area,and excavated three fault exploration trenches and several exploration pits. The fault exploration trenches extended to depths of up to approximately 16 feet and totaled approximately 270 feet in length. Based on his investigation,Mr. Rowland identified a fault extending through the Lands of Gigli. Mr.Rowland described the fault as a"thin,2-inch tone of sheared clay-shale and caliche,"juxtaposing sheared clay and gravelly Franciscan debris to the west with highly fractured Tertiary siltstones and claystones to the east. Mr.Rowland recommended a 40-foot wide building setback zone from the fault trace. The location of the trace and the setback zone in the area of the Gera property are shown on the Site Plan(see Figure 1). In 2008,this office completed an engineering geologic and geotechnical investigation prior to the development of the property at 12369 Gigli Court. As part of our investigation,we excavated and logged a 118-foot long fault trench that varied from approximately 12 to 15 feet deep. The trench was located beyond the 40-foot building setback from the fault 935 Fremont Avenue,Los Altos,California 94024 Phone:650.559.9980 Fax:650.559.9985 • •A Gera Property Limited Engineering Geologic Review identified by Mr.Rowland. The trench encountered siltstone and sandstone units similar to the Tertiary bedrock described by Mr.Rowland. No evidence of faulting was encountered and we generally concurred with the fault location identified by Mr.Rowland. DISCUSSION We understand that the proposed subdivision plan for the referenced property will create two parcels. Parcel A will be located to the south and will include the area of the existing residence and Parcel B will be located to the north. Based on Mr.Rowland's investigation, the fault trace is located approximately 10 to 15 feet south of the existing residence and the southern portion of the residence extends into the 40-foot building setback zone (see Figure 1). Based on our discussions with the Town Geotechnical Consultant,we understand that in order for them to support the currently proposed subdivision,it must be demonstrated by additional exploratory trenching that it is reasonable to reduce the width of the current building setback zone such that the existing residence is no longer impacted by it or to construct a residence that conforms to the existing building setbacks. The second alternative could include moving the existing residence beyond the easement or demolishing it and constructing a new residence outside the easement. Based on the location of the fault trace and the building setback zone,as well as standard front property line setbacks,a future residence on Parcel B will be located outside of the building setback zone. Based on our discussion with the Town Geotechnical Consultant,it is our understanding that additional fault exploration trenching will not be required for the future residence on Parcel B. This letter summarizes our current understanding of the fault-related building setback issues associated with the proposed subdivision. Our evaluation has been performed in accordance with engineering geologic principles and practices generally accepted at this time and location.' We make no warranty,either expressed or implied. Sincerely, MURRAY ENGINEERS,INC. Mark F.Baumann,C.E.G. 1787 Principal Engineering Geologist Copies: 'Addressee (2) Lea&Braze Engineering,Inc. (2) Attn: Mr.Jeff Lea,.P.E. Attachments: Figure 1,Site Plan MURRAY ENGINEERS INC Page 2 of 2 ► r r`r LEGEND s1. ' V'—V Fault Contact,Dashed where Approximate,Baths are Located on the Upthrown Side of the Fault,Arrows Indicate Direction of Dip of Fault Plane Recommended Fault Setback Zone -- dTren fi Base:Proposed Subdivision Lot Line Exhibit(Option 4)by Lea&Braze Engineering,Inc,dared January 22,2014 c ROS° Approximate Scale:1 inch=40 feet azDrzrf3ar M5.15'M'r ND.DS .-' fir -- -- -- -- -- -- -- -- \ O (J.` _ y • ,C i-1 _ --Po,..a. ...)_ 11 �'' .' r DD'nwsac (W-1�wi' 30 I[7lDCK ' ' �(��1NQ mMM r, 1 \.', /NI 'f • I •W 4107ED) (TQmIAAI) ' 1 Proposed:Lot Line . 1 • o "-MOM=LAT YK \ [D'<I1rc C') .i I. r� sisme \IS PIIMCOM LOT UE �`• • N , PARCEL B (AFTER.10' ROW DEDICATION) 6 1l;C gl "f GROSS: 81,006 SQFT 1.40 ACRE $$ 1i N44). NET: 61,006 SQFT 1.40 ACRE i \V- \ Proposed Lot Line 1 \\I (E)f> esidence �,�� \''S' \ 'it: , to Removed • vr:. r•ea \ 3:4,29•! i.'Y \ % \N 11 . �� \ 1 ` \ ' F"�"OD anol+c \ Proposed Lot Line 11 1 1 1 ... •,. ..,. 1 1 \ 1 1 , , 40'Building 7 M U R K AY 1 m ` 6/3 , Setback Line Parcel A N. SITE PLAN 1✓�; st 1. \ \ �— ENGINEERS INC 1 - 1 PARCEL Asa MIMEO • (AFTER 10' ROW DEDICATION) GROSS: 69,225 EQFT 1.46 ACRE �-h �� ' \1 \ NET: 83,225 SQPT 1.45 ACRE 1 GERA PROPERTY SUBDIVISION OW 10P9 It 1 ss 11 #Dn.�« arn.a 1 URT LOS ALTOS HILLS,12343 GIGLI 1x443 p 6. l caa>a&Pa e. 1 % 1 \ _ PROJECT NO. JULY 2014 FIGURE 1 1 1 . - ,, _ 20341L1 MURRAY RE©- ovE DEC 14 2015 GEOTECNNICAI SERVICES TOWN OF LOS ALTOS HILLS June 9,2015 Project No. 2034-1L2 (Revised) Anil Gera RE: PRELIMINARY GEOTECHNICAL 12345 Gigli Court EVALUATION, Los Altos Hills, CA 94306 PROPOSED LEACHFIELDS, GERA PROPERTY SUBDIVISION, 12345 GIGLI COURT, LOS ALTOS HII.IS,CALIFORNIA Dear Mr. Gera: As requested,we have performed a preliminary geotechnical evaluation of the proposed leachfield areas associated with the subdivision of your property at 12345 Gigli Court. We have previously completed a limited engineering geologic review of the proposed subdivision and presented the results in a letter dated July 18,2014. The purpose of this letter is to provide a preliminary assessment of the risk of landsliding in the area of the proposed leachfields on the two parcels that will be created by the subdivision. As the basis for this preliminary evaluation,we have reviewed our prior geologic review letter and discussed the project with you and Mr.Jeff Lea with Lea and Braze Engineering,Inc..In addition,we have reviewed the Town's geologic map,subsurface information developed during the original subdivision investigation,and historic imagery on Google Earth. Our evaluation did not include subsurface exploration in the proposed leachfield areas. We recommend that this exploration be performed prior to final approval of the subdivision. PROJECT&SITE DESCRIPTION The project will include the subdivision of the reference property to create two parcels. Parcel A will be located to the south and will include the area of the existing residence and existing leachfield and Parcel B will be located to the north and will require a new leachfield, which we understand will be located in the southeastern portion of the property. The approximate location of the existing leachfield on Parcel A and the general area of the proposed leachfield on Parcel B are shown on Figure 1,Site Plan. The location of the existing leachfield on Parcel A is based on the location of two standpipes at either end of the field. The east-facing slope in the area of the existing leachfield on Parcel A is uniform and has a gradient of approximately 4:1 horizontal to vertical. The area of the proposed leachfield on Parcel B has a similar slope (see Figure 1). According to the Town's geologic map,the property is located in an area underlain by Santa Clara Formation bedrock,which is generally composed of semi-consolidated sandstone, siltstone,and daystone. Exploratory trenching by this office on the adjacent property to the northwest at 12369 Gigli Court in 2007 identified 2 to 5 feet of colluvial soil overlying siltstone bedrock(Murray Engineers,Inc.,2008). Earlier subsurface exploration performed by Dunham and Associates as part of the original subdivision identified 4.5 feet of colluvial soil overlying sandstone and claystone bedrock near the northern corner of the property (Dunham and Associates, 1977). 1 935 Fremont Avenue,Los Altos,California 94024 Phone:650.559.9980 Fax:650.559.9985 Gera Property Limited Engineering Geologic Review Based on our reconnaissance,we did not observe any evidence of landsliding in the leachfield areas;however,according to the Town's geologic map a large landslide is located along Interstate 280 approximately 250 feet southeast of the site. Based on our review of historic aerial photographs and Google Earth imagery this landslide occurred after the construction of Interstate 280 and sometime during the late 1960s or early 1970s. Based on our review, the construction of Interstate 280 in this area included an approximately 40-foot high cut slope along the west side of the freeway. It seems likely that this substantial cut slope contributed to the initiation of this landslide. There is a lower cut slope along the freeway to the northeast of the site;however,the slope aspect of the site trends more toward the east and not directly toward this slope. OPINIONS Based on our preliminary evaluation,it is our opinion that the existing and proposed leachfields should not have a significant detrimental impact on the stability of the slopes on the property or adjacent properties. Based on subsurface exploration performed by Dunham and Associates during the original subdivision and our past subsurface exploration on the adjacent property to the northwest,we anticipate that the existing and proposed leachfield areas are underlain by Santa Clara Formation bedrock at relatively shallow depths of less than approximately 5 feet. Given the relatively shallow depth to bedrock and the moderate slopes,it is our opinion that the risk of future landsliding in the area of the proposed leachfields is low provided that the leachfields are designed and constructed in accordance with current local standards. In our opinion,subsurface exploration and percolation testing should be performed in the area of the proposed leachfield area prior to final subdivision approval. In addition,if modifications are proposed to the existing leachfield,subsurface exploration and percolation testing should be performed in this area. LIMITATIONS This preliminary evaluation has been performed in accordance with engineering geologic and geotechnical principles and practices generally accepted at this time and location. We make no warranty,either expressed or implied. Sincerely, MURRAY ENGINEERS,INC. pFESS10, Su, C44562 7,„.} Mark F. Baumann,C.E.G. 1787 Andrew D.Murray,P.E � Principal Engineering Geologist Principal Engineer Copies: Addressee (2) Lea&Braze Engineering,Inc. (3) Attn: Mr.Jeff Lea,P.E. Attachments: Figure 1,Site Plan Figure 2,Town Geologic Map MURRAY ENGINEERS INC' Page 2 of 2 • Base:Proposed Subdivision Lot Line Exhibit by Lea&Braze Engineering,Inc.,dated January 22,2014 Approximate Scale:1 inch=40 feet Approximate Location of Exploratory Boring by Dunham&Associates,1977 I (1016.4) _ ZS N6•-5'M'E ]U 95 . If' TL 1 - 1 V i }�4 ]Y 1<1Mat�W IOI�NI_ —tNI�H�I JO•I[iW.X V1Y/jl • //' W RM.)u +�� 1 I ; no a) "p'."'"� , 1 . `6• I Proposed'Lot Line • • 1 . ') rrtmwaEO Lot.P -l .:S yo nowt) vw6e®for(I �`.� I N.. s PARCEL H (AFTER 10' ROW DEDICATION) 11 11x 3r - - , GROSS: 61.006 SQFT 1.40 ACRE LR 11 �:e� \,5. NET: 61,006 SOFT 1.40 ACRE t \''' i` 4 1 �,, ,perLoi.imp____-- --–•7 11 \ , x maven) \N a / 1 1: 1 I o / 1 ` if \ 1 ''s ( \ 1t. / 1 1 �� 1 111' \I 11 \ / \ %'\\ \ p /b• 1 A 11 �` 1 1 uee6na s a y -J �i l 1 1 �. / neroogu 1x1,,1E 1 1.. 1 • U / \ \ f__ ..L-5'45_•4155 -- \ •1 ZT-',Z,, ,4 N. 1 MURRAY 1 ro1p,1101.1 \ } / s°o I N_ — — z, ENGINEERS INC IMl7uK SCM[ SS BE1SAOC SITE PLAN lws rws 6.) 1. 1 1 1 1 / 444 PARCEL A (AFTER 10' ROW DEDICATION) 1 277 ammo 1 \ I GROSS: 63,2E5 SQFT 1.46 ACRE GERA PROPERTY SUBDIVISION SETEASK USE PER1 L_ NET: 63,225 SQFf 1.45 ACRE ' 1g (443 IMPS SO Sa 12345 GIGLI COURT 1 `� 11 � :,era LOS ALTOS HILLS,CALIFORNIA -IAS r 174 1 1taxliAs64 \ 1 1 1 1 PROJECT NO. JUNE 2015 FIGURE 1 -- -- -- -- -' -- -- -- 20341L2 SA' L. L `\ 78 u 20‘' , / a 50, Alm% 30 ' • QTsc Qoal ‘ ,,,, Qo. 4 � :� KJfg Kr 'CI ' Ao 102 , SITE ) 4 J ,s, 1 z / �f1., - r .,,/ �? NSG ` v",^ .,, a KJfs - 4 `. , ,__, , , ,\\\ T /.• N ' ^. .�.._. .� KJfs �. /. / F 1 P ''aNC P 1 ... r ' 1 Legend & Selected Map Symbols Qoal Older Alluvium -.1 Fault Contact, dashed where approximate, -?� queried where location is uncertain,barbs are 40 located on the upthrown side of the fault, arrows QTsc Santa Clara Formation indicate direction of dip of fault plane 60 Strike and Dip of Strata KJfg Franciscan Complex Greenstone — — — Geologic Contact, dashed where approximate KJfs Franciscan Complex Sandtone Sheared Contact between Franciscan bedrock units rCN46'sN. �Jsp SerpentiniteBoundary of Landslide Deposit, dashed / where approximate Base: Geologic Map of Los Altos Hills,Cotton,Shires,and Associates,2005 Scale: 1 inch = 600 feet M U R R A Y GERA PROPERTY SUBDIVISION TOWN 12345 GIGLI COURT ENGINEERS INC. LOS ALTOS HILLS, CALIFORNIA GEOLOGIC MAP ciorrt,nmAi srry crs PROJECT NO. 2034-1L2 JUNE 2015 FIGURE 2 , rej COTTON, SHIRES AND ASSOCIATES, INC. CONSULTING ENGINEERS AND GEOLOGISTS October 22, 2014 L5094 RECEIVED OCT 2 7 2014 TO: Cynthia Richardson TOWN OF LOS ALTOS HILLS Associate Planner TOWN OF LOS ALTOS HILLS 26379 Fremont Road Los Altos Hills, California 94022 SUBJECT: Geotechnical Peer Review RE: Gera,Two-Lot Subdivision 326-14-PM-TM 12345 Gigli At your request, we have completed a geotechnical peer review of the application for the proposed lot split using the following documents: • Limited Engineering Geologic Review — Proposed Subdivision (letter) prepared by Murray Engineers, dated July 18,2014; and • Proposed Subdivision Civil Plans (5 sheets) prepared by Lea & Braze Engineering, dated September 1,2014. In addition,we have reviewed pertinent technical data from our office files. DISCUSSION • We understand that the applicant proposes to subdivide the 2.8-acre property into two lots (approximately 1.4 acres each) for future single-family residential development. We understand that the existing residence at the property would be removed. Previous site geologic investigation identified the trace of the Monta Vista Fault approximately 10 to 15 feet southwest of the existing residence. Northern California Office Central California Office Southern California Office 330 Village Lane 6417 Dogtown Road 550 St.Charles Drive,Suite 108 Los Gatos,CA 95030-7218 San Andreas,CA 95249-9640 Thousand Oaks,CA 91360-3995 (408)354-5542•Fax(408)354-1852 (209)736-4252•Fax(209)736-1212 (805)497-7999•Fax(805)497-7933 www.cottonshires.corn Cynthia Richardson October 22,2014 Page 2 L5094 SITE CONDITIONS The subject property is characterized by the relatively level crest of a knoll and moderately steep to very steep flanking east-facing slopes. The Monta Vista Fault was identified crossing through the westernmost portion of the property during a 1977 geologic investigation. The fault was characterized as a relatively thin to a wide zone of shearing with Franciscan bedrock to the west and Santa Clara bedrock to the east. We understand that 20 to 40-foot wide fault setbacks were recommended on both sides of the identified fault trace/sheared interval. The easternmost "25-foot" building setback line illustrated on referenced Civil Plans appears to be coincident with the eastern edge of the fault setback recommended by the 1977 geologic.investigation. CONCLUSIONS AND RECOMMENDED ACTION We are not aware of more recent local geologic investigations that would modify or otherwise change the local position of the Monta Vista Fault determined in the 1977 investigation. In addition, the eastern edge of the fault setback zone defined in 1977 (consistent with current Civil Plans) appears to be appropriate based on existing data. We are not aware of changed local geologic conditions that would alter geologic or geotechnical considerations for residential development since the subdivision deliberations of 1977. Development within the western portion of the property is constrained by the potentially active Monta Vista Fault. Per Town standards, new residential buildings should not be constructed within the depicted fault setback area covering the westernmost portion of the property. The stability of steep slopes in the eastern portion of the property could he adversely impacted by inappropriate grading or drainage. Any future significant grading or drainage changes in the eastern portion of the property should be evaluated from a geotechnical perspective to reduce the potential for adverse slope instability impacts. LIMITATIONS This geotechnical peer review has been performed to provide technical advice to assist the Town in its discretionary permit decisions. Our services have been limited to review of the documents previously identified, and a visual review of the property. Our COTTON,SHIRES AND ASSOCIATES, INC. Cynthia Richardson October 22, 2014 Page 3 L5094 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. Respectfully submitted, COTTON, SHIRES AND ASSOCIATES,INC. CITY GEOTECHNICAL CONSULTANT Ted Sayre Principal Engineering Geologist ' CEG 1795 77 IL:Q.,David T. Schrier Principal Geotechnical Engineer GE2334 TS:DTS:kd COTTON, SHIRES AND ASSOCIATES, INC. COTTON, SHIRES AND ASSOCIATES, INC. CONSULTING ENGINEERS AND GEOLOGISTS March 23,2015 L5204A ECEIVE TO: Cynthia Richardson R DEC 14 2015 ---' Acting Planning Director TOWN OF LOSALTOS HILLS TOWN OF LOS ALTOS HILLS •26379 Fremont Road Los Altos Hills,California 94022 SUBJECT: Geo technical Peer Review RE: Gera,Two Lot Subdivision #51-1.5-TM 12345 Gigli Court At your request, We have,completed a geoteclmical peer review of the proposed Tentative Map Application using: o Limited Engineering Geologic Review - Proposed, Subdivision (letter-teport) prepared by Murray Engineers, Inc., dated July 18, 2014; • Proposed Subdivision Tentative Map Exhibits (6 sheets, 20-scale) prepared by Lea&Biaze Engineering, Inc., dated February 23,2015;' and • Topographic Survey (1 sheet, 20-scale) prepared by Lea & Braze Engineering, Inc.,dated January 14, 2014. In addition, we have reviewed, pertinent documents and maps from n our office files-and completed a recent site reconnaissance from the vicinity of the site.swirnming pool and other local vantage points. DISCUSSION The applicant proposes to subdivide an existing. 2.85 acre parcel into two new parcels. The proposed subdivision would create Parcel A to the south and Parcel B to the north. We understand that the existing one-story house on Parcel A (to be removed) extends into a fault setback that was established as a result of a '1977 subdivisiori geologic investigation. The atilt rupture zone and associated, setbacks were also Northerly California Office Central California Office Southern California Office 330 Village Lane 6417 Dogto‘,,n Road 550 St Charles Drive;Spite 108 Los Gatos,CA 95030-7218 San Andreas,CA 95249-9640 ThOusand'Oaks,CA 91360-3995 (408)354-5542 0 Fax(408)354-1852 (209)736-4252 0 Fax(209)736-1212 (805)497-7999•Fax(805)497-7933 www.cottonstares.coin • Cynthia Richardson. IVlarch.23,2015 Page 2 L5204A depicted in a 1987 site investigation by Purcell, Rhoades & Associates. It appears that the site fault rupture zone and setbacks delineated in 1987, essentially match those of the current Tentative Map. We understand that the existing site swimming pool.is to be removed but that other structures within Parcel B are to•remain..Accessto the-proposed.parcels would be provided by a revised'"T" shaped driveway serving both,parcels. Provided plansdepict conceptual septic leachfield areas for the two proposed_parcels withiii the eastern half of the property. The referenced letter-report by Murray Engineers is limited to a review of site fault setback .constraints: Based on the results of other, fault investigation, work completed in the vicinity, the Consultant indicates that'.the'more recent subsurface data is in general concurrence with the findings of 1977 subdivision fault investigation Evidence of faulting hasnot been locally found outsideof the.previously delineated (1977)potential fault rupture zone. SITE CONDITIONS The subject property is generally characterized by relatively _level to gentle' slopes to the west and moderately steep to steep slopes to the east: Slopes appear to drain by sheet.flow primarily towards the east. On proposed Parcel A,a slope inflection occurs near the 466-foot topographic. contour elevation with gentle slopes in the west (approximately 16 percent inclination) changing to moderately steep (24 percent inclination) slopes in the. east. Our preliiriinary review of historic aerial photographs suggests the potential for previous shallow slope instability along, the common property line between Parcels A and B below the 466-foot contour. Discing of local slopes has subdued signs of a possible past slope instability that may have been active over 30 years ago. Both delineated proposed septic leachfields would extend into this potentially suspect slope area. • The Town Geologic Map depicts a trace of the Morita Vista. Fault along the eastern side of Gigli Court, and this is consistent with previous subdivision investigation findings. This fault separates Franciscan bedrock materials to the west from Santa Clara Formation.bedrockto the east Local steep slopes descending towards the freeway have failed by landsliding both to the north and south of the subject property. COTTON,SHIRES AND ASSOCIATES, INC. Cynthia Richardson March 23,2015 Page 3 L5204A CONCLUSIONS AND RECOMMENDED ACTION The parcels to be created by the proposed subdivision are constrained by potentially expansive earth materials, the Monta Vista Fault, potential unstable steep slopes, and strong seismic ground shaking. Weare not aware of .geologic- data that. would invalidate the conclusions regarding faulting and fault setbacks established during the initial Gigli Subdivision. Fault rupture hazards appear satisfactorily addressed by observance of previously delineated fault setbacks as illustrated on the current Tentative,Map. Our primary geotechnical concern regarding the proposed :subdivision is the potential for slope instability in the steeper 'eastern portions of the property. Septic leachfield systems located on these slopes (ascurrently delineated) may increase the potential for future slope instability. Prior to geotechnical .approval of the Tentative. Map, application, we recommend that the following supplementalinvestigation be completed Supplemental Geologic and Geotechnical Investigation — The Project Geotechnical Consultant (with resources of an, Engineering Geologist) should,evaluate geotechnical feasibility of the current subdivision plans including areas, for possible septic leachfields. Historic aerial photographs should be evaluated and site geologic mapping should be performed: The geotechnical,.suitability of site slopes:for septic leachfield systems should be evaluated considering subsurface data obtained from the vicinity of depicted leachfields. General geotechnical recommendations -for discharge' of concentrated 'drainage should be provided. Appropriate foundation types for new structures should be addressed. Appropriate, documentation to address the aboveshould be submitted to the Town for review by the Town Engineer and Town Geotechnical Consultant prior to providing final.recorrimendations regarding the Tentative Map application. LIMITATIONS This geotechnical peerreview has been performed to provide technical advice to assist the Town with its discretionary permit decisions. Our services have been limited to review of the documents previously identified, and a visual review ofthe property. COTTON,'SHIRES AND ASSOCIATES, INC. Cynthia Richardson March 23,2015. Page 4 L5204A Om 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. Respectfully submitted, COTTON, SHIRES AND ASSOCIATES,INC. TOWN GEOTECHNICAL CONSULTANT Ted Sayre Principal.Engineering Geologist CEG 1795 juLee--X z:14 David T.Schrier Principal Geotechnical Engineer GE 2334 TS:DTS:kc COTTON,SHIRES AND ASSOCIATES, INC. December 21,2015 L5204B TO: Steve Padovan Planner TOWN OF LOS ALTOS HILLS 26379 Fremont Road Los Altos Hills,California 94022 SUBJECT: Supplemental Geotechnical Peer Review • RE: Gera,Two Lot Subdivision #51-15-TM 12345 Gigli Court At your request, we have completed a geotechnical peer review of the proposed Tentative Map Application using: • Preliminary Geotechnical Evaluation - Proposed Leachfields (letter) prepared by Murray Engineers,Inc., dated June 9, 2015; • Limited Engineering Geologic Review - Proposed Subdivision (letter-report) prepared by Murray Engineers, Inc., dated July 18, 2014; • Proposed Subdivision Tentative Map Exhibits (6 sheets, 20-scale) prepared by Lea &Braze Engineering,Inc., dated February 23,2015; and • Topographic Survey (1 sheet, 20-scale) prepared by Lea & Braze Engineering,Inc., dated January 14,2014. In addition, we have reviewed pertinent documents and maps from our office files. DISCUSSION The applicant proposes to subdivide an existing 2.85 acre parcel into two new parcels. The proposed subdivision would create Parcel A to the south and Parcel B to the north. We understand that the existing one-story house on Parcel A (to be removed) extends into a mapped fault setback that was established as a result of a 1977 subdivision geologic investigation. We also understand that the existing site swimming pool is to be removed but that other structures within Parcel B are to remain. Access to the proposed parcels would be provided by a revised "T" shaped driveway serving Steve Padovan December 21,2015 Page 2 L5204B both parcels. Provided plans depict conceptual septic leachfield areas for the two proposed parcels within the eastern half of the property. In our previous geotechnical peer review (dated March 23, 2015), we concluded that the Project Geotechnical Consultant had adequately addressed the issue of potential site fault rupture constraints; however, we recommended that the Consultant evaluate the geotechnical feasibility of delineated septic leachfield areas and provide geotechnical recommendations for discharge of concentrated surface drainage. We noted that older aerial photographs suggested the presence of potential past shallow slope instability in the proposed leachfield area. Recent observations of adjacent slopes do not indicate geomorphology associated with landsliding. We understand that the County Environmental Health Department has provided preliminary approval of delineated septic leachfields. CONCLUSIONS AND RECOMMENDED ACTION The parcels to be created by the proposed subdivision are constrained by potentially expansive earth materials, the Monta Vista Fault, potential unstable steep slopes, and strong seismic ground shaking. The Project Geotechnical Consultant has completed a preliminary assessment of the risk of landsliding in the area of proposed septic leachfields and concluded that leachfields should not have significant detrimental impacts on slope stability. However, the Consultant recommends that geotechnical subsurface exploration be performed in septic leachfield areas (to confirm anticipated shallow bedrock conditions) prior to final approval of the subdivision. We do not have geotechnical objections to approval of the Tentative Map application with the condition that the following item be satisfactorily addressed prior to approval of the Final Subdivision Map: Geotechnical Exploration — The Project Geotechnical Consultant should complete recommended subsurface exploration within proposed septic leachfield areas to investigate the geologic and geotechnical viability of septic systems. The presence of past landsliding, depth of colluvial soils, and depth to competent bedrock materials should be determined. Appropriate geotechnical recommendations should be provided, as warranted, to address adverse conditions if encountered. Appropriate documentation to address the above should be submitted to the Town for appropriate technical evaluation prior to approval of the Final Subdivision Map. Steve Padovan December 21,2015 Page 3 L5204B LIMITATIONS This geotechnical peer review has been performed to provide technical advice to assist the Town with its 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. Respectfully submitted, • COTTON, SHIRES AND ASSOCIATES,INC. TOWN GEOTECHNICAL CONSULTANT Ted Sayre Principal Engineering Geologist CEG 1795 David T. Schrier Principal Geotechnical Engineer GE 2334 TS:DTS:kc EDWARD L. PACK ASSOCIATES. INC. • 1975:HAMILTON AVENUE Acoustical Consultants TEL:408-371-1195 . SUITE 26 FAX:408-371-1196 . SAN JOSE,CA 95125 www.packassociates.com July 3, 2015. RECEIv ED Project No. 47-002-1 JUL ` 7 2015: Mr. Anil Gera 12345 Los Altos,Gigli CA .94022 Court TOWN OFLOS ALTOS.HILLS • Subject Noise Assessment Study for the Planned Single-Family Subdivision, Los Altos Hills Dear Mr. Gera: This report presents the results of a noise assessment study for,the planned single-family subdivision at 12345 Gigli Court in Los Altos Hills, as shownon the Development - Information Plan; Ref (a). The noise exposures at the site were evaluated against standards of the Town of Los.Altos Hills Noise Element, Ref (b): The analysis of the on- site sound level measurements indicates that the existing noise environment at the site is due primarily to vehicular traffic sources on Interstate 280. The results of the study indicate that the noise exposures at the site exceed the limits of the standards. The interior noise exposures in the house proposed for Parcel A will be within the limits of the standards. A house location has not yet been proposed for Parcel.B. Noise mitigation measures will be required for exterior living areas, depending upon the filial site layout. Sections I and II of this report contain a summary of our fmdings and recommendations, respectively. Subsequent sections contain the site, traffic and project descriptions, analyses and evaluations. Attached hereto are Appendices A, B and C, which include the list of references, descriptions of the applicable standards, definitions of the terminology, descriptions of the acoustical instrumentation used for the field survey, general building shell controls, and the on-site noise measurement data and=calculation tables. -2 - I. Summary of Findings The noise exposures presented herein were evaluated against the standards of the Town of Los Altos Hill Noise Element, which utilizes the Community Noise Equivalent Level (CNEL)to define acceptable noise environments at residential exteriorliving areas. The Noise Element specifies a limit of 60 decibels (dB) CNEL for usable exterior areas; . such as rear yards, swimming pools and patios. The Noise Element also limits the interior noise exposure in residential living spaces to 45 dB CNEL. • The noise exposures shown below are without the application of mitigation measures and represent the noise environment for the planned development site.. A. _ Exterior Noise Levels The existing exterior noise exposures at the most impacted planned building setback of the proposed home on Parcel A (515 ft from the centerline of 1-280) is 61 dB CNEL. Under future traffic conditions, the noise exposure is expected to increase to 62 dB CNEL.. Thus, depending upon the location of an:exterior living area, the noise exposures could be up to 2 dB in excess of the standards of the Town of Los Altos Hills Noise Element. • The existing exterior noise exposure at the mostimpacted area of Parcel B at the edge of the=mostly flat area portion of the site is 67 dB CNEL. Under future traffic conditions, the noise exposureis expected to increase to 68 dB CNEL. Thus, depending upon the location of an exterior living area, the noise exposures could be up. to 8 dB in excess of the standards of the Town of Los Altos Hills Noise Element As shown above, the exterior noise exposures could exceed the limits of the standards. Mitigation measures are provided herein to reduce excess noise to acceptable- levels. • -3 - A noise contour map for future traffic conditions is provided on Figure 1 below. The contours assume that the buildings on Parcel A will be removed but the buildings on Parcel B will remain. VINaoanV3,,,.m...'.... a.: i ",.'L•'. ; o W 'S III1 so17Y so'I dYJ 3AI1YJN31 r r !1 NOISIAIaens a3sodoad $T,l ..s ,,e, �` '-"' lano3 Hale steal .., , t� 7i1111��t11�/O1 NOISIAIo00s 933NYd , -' 1 1 3:l i I I1 Eiei t'!!gill �11,311 til ;! 8 { _y_ 139E Alif iii Hato Ii0W - TAPE - Ei' 19 le; e., 1111 ' / ' 1 Add duo f I CIl1I;i --7---.._-:-_--- - -::::-.-- --1 ji 1 ' 1,;:n, I 11 1 s . -— \t IC; .I ' I iiH 3.111t-:----• +- - • gggg it;F: I t ; 'g l I 4C� g .R -4 , / e& iii ,., ; 11 -.7c' , ;. ;; it 6 -Is°° ,/ x11111 j 11% VA 1'/ •4 .\i/ l,,kiii ��. / i ; iflibil: ` CP .. ` ■' // 1 W aliIiti °I` i E,i 1 j Illi 1 II- if 1"�hil ' II ; . F.B C EL f glh')►�- __-)- 1 r_ I 1 —/""---L-- ,� 111'' :11111.:11/y . �~` J_, Ili 4.! )1_ :4'0+1e ie 20ir ,,,....„,..„,..._ 4• '‘„,t\ .._,,;;;;...,r tipp['P1 j Nifpl 4,, Bili ,. • I• FIGURE 1 –Future Noise Contours -4- B. Interior Noise Exposures • The interior noise exposures in the most impacted living spaces of the home proposed for Parcel A will be up to 36 and 37 dB CNEL under existing and future traffic conditions, respectively. Thus,the noise exposures will be within the limits of the Town of Los Altos Hills Noise Element standards. • A house has not yet been proposed for Parcel B. However, should a house be located near the edge of the mostly flat portion of the site closest to I-280, such as the location of the existing sheds, the interior noise exposures will be up to 42 and 43 dB CNEL under existing and future traffic conditions,respectively. The interior noise exposures will be in compliance with the standards. Noise mitigation for the interior living spaces will not be required. II. Recommendations A. Exterior Noise Controls Parcel A • To achieve compliance with the 60 dB DNL standard of the City of Los Altos Hills Noise Element a 5 ft. high acoustically-effective barrier will be required if the exterior living area is located anywhere within the area outlined in red as shown on Figure 2. The location of the barrier is dependent upon the location, layout and final grading of the exterior living area. - 5 - � � � � 4 ago 478 41 s ^ �4781 � e _ EDGE DE 471.7_ i •9.� PROPust D •5 �, .�F R'v.v, 'STV ' PAVEMENT N / ♦-. -. -� - *• PROP R ul, 428.18 478.1\ x--4'2 469_ 1 4 _`f I • ;I... ko�•.. 478.36 .�i' n \ INV=4b9.56 1�_ \ ,DOr , \ X I : tk, f t /.r AD. CENCE. 476 65,;� 1 - T47�� 470 .�j ` .",;:z;` 48Q.47 . / • TND-siogY \ (I ' -' ♦, .78.3'Q�/ ,. iiii`� S6RP- 945' 4.– - / u•r:, 7• 6RP-494 s' / '�' f . . ,,-----_,-,..+:4. s. V 48044 4/0.90 47i > I 4 • iii 'SA . CONCEPTUAL DRIVEWAY •04ANGFa,1; . fj �, . ` D. N4 j.0 40 ! I ,1 -d�'.t f\ \. CONCEPTUAL N" SANITARY SEWER / ` .7� \ KI ; • '• LATERAL PROPOSED PR( / u 1 ��SEP7T TRAC i ...- /. 10 REM 463 M c \ RKV\/ ', • 4�_� r.‘X s ` SSCO >�, If FO 969 ,� - >_ • -_ % I PARCEL 97.„ 401 0x� 'pe ` � \ ' �� ,..KD 160': �� '� l WD 48 A-- * '' ". Al.NOOSE J '.' -� �.�V- /' 1 5N/A,/ �{ >t40•BUILDING ) /�/ '/ K • ' I 7 'Kt i v E TCONTACT�,\\ 5 (uSETBACK MONTE J ,y \7/r 1 .8 I„`C �• \ 27 BARBS ARE \ �/ \ • --'2 VISTA FAULT -\/,' \/;• / , / I/ / 7) T7) ON TME V 1 • TRACE I'`'' I� �/ A'�� may/ hN SIDE OF \,\ /�4 1 SETBAgC CONCEPTUAL 7 / THE FAULT. \1,5 / .�i '� RETENTION �i •I </ •��.- \ \ / \�5» �-•_. SYSTEM ,/I I / Xx / // /A A / A \'�J�\�\'• SEtBACN�I PER t...\...,..._ • h\�� 7 �' �� / 1 \/ "\ (461 MAP- 54) //� `• LEACH FIELD POTENTIAL / � RUPTURE ZONE \>;; / (463 MAPS 54),.'' a l • \X� FIGURE 2 i 1 25' BUILDING ' `, , \ I ,,- Any exterior living area within the red outline SETBACK LINE PER / ',k_ (463 MAPS 54) \ \ \_„6,,,, will require a 5 ft. high noise contol barrier. LOT '‘ `� The precise barrier location and extent is TRACT 11,(30. 6763 dependent upon the exact location of the 1 463 MAPS 54 ! 1\\ 1 exterior area. 1 - 6 - Parcel B • To achieve compliance with the 60 dB DNL standard of the City of Los Altos Hills Noise Element a 6 ft. high acoustically-effective barrier will be required if the exterior living area is located anywhere within the area outlined in blue as shown on Figure 3. The location of the barrier is dependent upon the location, layout and final grading of the exterior living area. ) -- -- -- _. _ , - T • . 5 kl., l: `SA, 1 • ��\ANit D AG4 ACII I' - �ASEMEN7'FR�(C ^. fli. 465 \RFK ; LI'- �. '\ }iiw. 178 1 �. v' 1. A F . PROPOSED ' \R - se'" \ :z1 r, N . s4 • .-g.t� 6. @,� - v PR RTY .d 4 al s \` IN'. 69`.,6 T • N' ' * 7 T, , \ ri` •I'E.WOCA 4. 'r nt �ri6r..3w.-6�7 '. I J.:. • < s a .E \ T Y 479 6NP+19A j ...)......'....::::::.*:\ /~ 1 4 44 t!L 9,,. r� T-::: 'T,` AR H (AFTER 10 � '� I (GROSS: 61,874 SQFT CONCEPTUAL DRIVEWAY NET: \ 61,006 SQFP >K1 W \ •SED PROPERTY LINE \ I w / (p SEPpC r LOT 3 \ I / .- a REMAN). - TRACT O. 3763 I169 MAPS 64 \ / \ ssco \ .`.. \\ °), 7YPE It FO.*DA7iOx ! G 1 it , '1RTHER SUS01N1'IDAB.E, . \ \ PARCEL A °',,,`26,231 SO.r<. ' I,D .. 160' ' , :. ACRES , CONCEPTUAL NOM 4 / J �� N 1 1'✓ - II \ (40'eINc j , �(UNE AcK NOMI ) ` 1! `SEreA( FIGURE 3 -14r --\ (,oNg,, 1 SETBACK"D Any exterior living area within the blue outline will 1 (483 MAP 54) \ '� require a 6 ft. high noise control barrier. The precise ` barrier location and extent is dependent upon the \\\ ', l _ _ exact location of the exterior area. \ ` 1 . \ l� 1 - 7- To achieve an acoustically-effective barrier, it must be constructed air-tight, i.e., without cracks, gaps or other openings, and must provide for long term durability. The barrier can be constructed of masonry, wood, stucco,metal, earth-berm, or a combination thereof, and must have a minimum surface weight of 2.5 lbs./sq. ft. Clear materials minimum % in. thick may also be used. If wood fencing is used, homogeneous sheet materials are preferable over conventional wood fencing as the latter has a tendency to warp and form openings with age. However, high quality air-tight tongue-and-groove, board and batten or shiplap construction can be used. All connections with posts, pilasters or the building shells must be sealed air-tight. No openings are permitted between the upper barrier components and the ground. III. Site, Traffic and Project Descriptions The planned development site is located along the east side of Gigli Court between Elena Road and Interstate 280 in Los Altos Hills. The site is on the south side of Interstate 280 and slopes down to the north toward the freeway. Surrounding land uses include single-family homes adjacent to the south, adjacent to the north and across Gigli Court to the west. The parcel to the east is currently vacant. The on-site noise environment is controlled primarily by vehicular traffic sources on I-280, which carries an Average Daily Traffic (ADT) volume of 109,000 vehicles, as reported by CalTrans, Ref. (c). Portions of the freeway are partially shielded by intervening topography. The primary direction of traffic noise toward Parcel A is from the northeast at a direction normal to the freeway. The primary direction of traffic noise toward Parcel B is from the north along a line-of-sight toward the baseball fields across I- 280. The proposed project includes the splitting of the existing parcel into two parcels, demolishing the existing home on Parcel A and removing the swimming pool on Parcel B. The home for Parcel B has not been specified or designed. Ingress and egress to the site will be by way of the existing driveways on the sites off of Gigli Court. - 8 - III. Analysis of the Noise Levels A. Existing Noise Levels To determine the existing noise environment at the site, continuous recordings of the sound levels were made at two locations on April 1-2, 2015. Location 1 was 400 ft. from the centerline of I-280 on Parcel B at the edge of the flat portion of the site on the north side of the existing shed. Location 2 was 417 ft. from the centerline of I-280 at the near the center of Parcel A. The on-site measurement locations are shown on Figure 4 on Page 9. The sound levels were recorded and processed using Larson-Davis Model 812 Precision Integrating Sound Level Meters. The meters yield,by direct readout, a series of descriptors of the sound levels versus time, as described in Appendix B, and the results are shown in the data table in Appendix C. The measured descriptors include the Ll, L10, LS0, and L90, i.e., those levels exceeded for 1%, 10%, 50%, and 90% of the time. Also measured were the maximum (L.) and minimum levels and the continuous equivalent- energy levels (Leg), which are used to calculate the CNEL. The measurements were made for a continuous 24-hour period at each location and included representative hours of the daytime,evening and nighttime periods of the CNEL index. Vehicular traffic noise dissipates at the rate of 3 to 6 dB for each doubling of distance from the source and contains a wide spectrum of frequency components (from 100 to 10,000 Hz), which are associated with engine, tire, drive-train, exhaust and other sources. These frequency components are centered primarily in the 500 and 1,000 Hz octave bands, and were used in determining the noise control measures recommended for this project. j.Y•. i ; 0 ;; +' 3 t r, i : 4 ; Meas La . } r . ' ip- _ , Ili V'-')., '-2- ".-' 2:' ' 4:''' • -,4 k...1 1 ' ,f ‘i , r \ w \ e ' ha i4 Iy r 4: . ,17►.,-`tom' ,*'• . 0. FIGURE 4—Noise Measurement Locations B. Future Noise Levels Future traffic volume data for I-280 were not available from CalTrans. Therefore, an average annual traffic growth rate was calculated from the change in traffic volume from 1993 to 2013. The 1993 ADT volume for I-280 was 91,000 vehicles, Ref. (d). The 2013 (existing) traffic volume is 109,000 vehicles ADT. Thus, the average annual growth rate was calculated to be 0.91% per year. Applying this growth rate to the future 20 years, the 2033 traffic volume was calculated to be 130,560 vehicles ADT. This 4.5% increase in traffic volume yields a 1 dB increase in the traffic noise levels. - 10- IV. Evaluations of the Noise Exposures A. Exterior Noise Exposures To evaluate the on-site noise exposures against the exterior noise standards of the Town of Los Altos Hills Noise Element, CNEL's for the survey locations were calculated by decibel averaging of the Leq's as they apply to the daily time periods of the CNEL index. The CNEL is a 24-hour noise descriptor that uses the measured Leg values to calculate a 24-hour time-weighted average noise exposure. Evening and nighttime penalties of 5 dB and 10 dB, respectively, were added to the measured noise levels to account for the increased human sensitivity to noise during these hours. Adjustments were made to the measured noise levels to account for various setback distances of receptor locations from the measurement locations using methods established by the Highway Research Board, Ref. (e). The formula used to calculate the CNEL is described in Appendix B. The existing noise exposure at measurement Location 1 400 ft. from the centerline of I-280 with an exposure toward the northwest was calculated to be 67 dB CNEL. Under future traffic conditions, the noise exposure is expected to increase to 68 dB CNEL. The existing noise exposure at measurement Location 2, 471 ft. from the centerline of I-280 and with a northerly orientation was calculated to be 63 dB CNEL. Under future traffic conditions, the noise exposure is expected to increase to 64 dB CNEL. Location 2 had a greater amount of topographic shielding due to the nose of a hill that protrudes toward I-280 between the two proposed parcels. At the setback of the proposed home on Parcel A, 515 ft. from the centerline of I- 280, the noise exposures were calculated to be 61 and 62 dB CNEL under existing and future traffic conditions, respectively. Exterior living areas for the two sites have been determined. Thus, noise exposure calculations for specific locations could not be performed. - 11 - B. Interior Noise Exposures To evaluate the interior noise exposures in project living spaces against the 45 dB CNEL limit of the Town of Los Altos Hills Noise Element standards, a 25 dB reduction was applied to the exterior noise exposure at the building setback to represent the attenuation provided by the building shell under a closed window condition. The closed window condition assumes that windows are standard dual-pane thermal insulating windows that are kept closed all of the time for noise control. The windows may be kept closed as the Mechanical Code requires full time supplementary ventilation. The interior noise exposure under existing traffic conditions in the most impacted living spaces of the proposed home on Parcel A was calculated to be 36 dB CNEL. Under future traffic conditions, the noise exposures are expected to increase to 37 dB CNEL. Thus, the interior noise exposures will be within the limits of the Town of Los Altos Hill Noise Element standards. Any house location on Parcel B that is located on the relatively flat portion of the site (no closer to I-280 than the existing sheds) will have interior noise exposures within the 45 dB CNEL limit of the Town of Los Altos Hills Noise Element standards. As shown by the above evaluations, the exterior noise exposures will exceed the limits of the standards. Mitigation measures will be required depending upon the fmal layouts of the sites. The recommended measures are described in Section II of this report. The interior noise exposures will be within the limits of the standards. Mitigation measures for the interior living spaces will not be required. - 12 - This report presents the results of a noise assessment study for the planned single-family subdivision at 12345 Gigli Court in Los Altos Hills. The study findings for present conditions are based on field measurements and other data and are correct to the best of our knowledge. Future noise level predictions were based on information provided by CalTrans. Significant changes in the future traffic volumes, speed limits, motor vehicle technology, noise regulations, or other changes beyond our control may produce long range noise results different from our estimates. If you have any questions or would like an elaboration on this report, please call me Sincerely, EDWARD L. PACK ASSOC., INC. Jeffrey K. Pack President Attachments: Appendices A, B, and C • APPENDIX A References: (a) Development Information Plan, Parcel Subdivision, 12345 Gigli Court, Los Altos Hills,by Lea&Braze Engineering, Inc., September 1,2014 (b) Noise Element of the General Plan, Town of Los Altos Hills, Adopted November 8,2007 (c) "www.dot.ca.gov/hq/traffops/saferesr/trafdata/2013a11/r280-405i.htm", State of California Department of Transportation,Division of Traffic Operations (d) 1993 Traffic Volumes on California State Highways, State of California Department of Transportation, Division of Traffic Operations,July 1994 (e) Highway Research Board, "Highway Noise-A Design Guide for Highway Engineers", Report 117, 1971 APPENDIX B Noise Standards, Terminology, Instrumentation and Building Shell Controls 1. Noise Standards A. Town of Los Altos Hills Noise Element Standards The Town of Los Altos Hills Noise Element of the General Plan, adopted November 8, 2007, contains land use compatibility standards and polices for various land uses. The chart and policies shown below summarize the noise standards applicable to development projects. known hmenicr I ipn.7J Land lige and None(ompallbin)Gudelines Ltlmns None ExposureI.and tu(ah•Ean (Ldn or(NEL.d8) 55!00 1 651 70! 75 eo slnitl.-lamrn reyidcnnal and nr.•..ryce t Milo,port,and r.•.n•annn \,•ichh"-hood park,anal rla7 groundsSd..d,,hc.hranmuseum, knpil:d,.r.•r.,nal ennllnF hall...hunch., I Milk.•lrnlding,.hnrne.. .._ ..m ma..tal.and prole..nnal (.u.h a,Tin.n Ilall) Audn.mum...rocen hall,amrhi- theatre, r iihORMALI.YAIYI:p(AHLI,sl,aacfiu.t ua�,.avl..ay n,.ea nlhm nap wnrh.ury un�uxs m. . uc naW.w.,m wnJ ma .r m.eahul any geci.l nwla,.ni.ryurccn.. (5)SU)IN WALLY A((LPI'ABI.I.'co.died(,..tuse tn.,hr petitioned only.mer detailed araly.ts of naenv.e man rryuhnornu ua1 nea61 name n.ulat..feaura inclubt in the&lie ■ A( ITA81d:tin.taeatt. u.11=P.n.h..hl acr.n.sn n.hers .ken h.c.u.e mni7a.m uu,..11.n.feuMk Io eonplY.ilh .e element wd<in Source Ad.a.d Prom G.nral Plan GLOCIOMPS Otho.on Rarnlnp and R...azn.App.nd.a C 2003. how Hearne 1..Aline Hied,f.l%.r. P.p In B-1 Adopted November 8,2007 GOAL 2 Provide compatible noise environments for new development. Policy 2.1 All development adjacent to Interstate 280,Arastradero Road or Foothill Expressway should be designed so as to minimize the impacts of noise generated by traffic movement. Policy 2.2 Residential construction in high-noise-level areas shall include provisions for structural insulation as necessary to ensure maximum possible noise attenuation,with the objective of ensuring a maximum of CNEL 45 dB. Policy 2.3 Mitigation measures such as site planning, building orientation, window placement, increased setbacks, landscaped berms, and sound-proofing shall be required in new development when necessary to reduce the impacts of noise. Policy 2.4 The construction of sound walls on private properly adjacent to Interstate 280 and within the State right-of-way shall be discouraged. Policy 2.5 The potential for new development to generate noise levels higher than Town standards shall be evaluated, and significant impacts shall be appropriately mitigated. Policy 2.6 Work with adjoining municipalities and public and private landholders to assure noise-compatible land uses across Jurisdictional boundaries. Program 2.1 Evaluate noise impacts on surrounding land uses during the site development review and permitting process. Program 2.2 Utilize the Land Use and Noise Compatibility Guidelines as a basis for determining the compatibility of land uses. Program 2.3 To determine noise exposure, use the noise contour maps or more detailed noise analysis if appropriate. Program 2.4 Require the mitigation of all significant noise impacts as a condition of project approval. Program 2.5 Convey the Town's sound wall policy to Caltrans and work with the agency to develop more acceptable alternatives such as landscaped berms along Interstate 280. Noise Element Los Altos Hills General Plan Page 11 B-2 2. Terminoloor A. Statistical Noise Levels Due to the fluctuating character of urban traffic noise, statistical procedures are needed to provide an adequate description of the environment. A series of statistical descriptors have been developed which represent the noise levels exceeded a given percentage of the time. These descriptors are obtained by direct readout of the sound measuring instruments. Some of the statistical levels used to describe community noise are defined as follows: Li - A noise level exceeded for 1%of the time. L10 - A noise level exceeded for 10%of the time, considered to be an "intrusive" level. L50 - The noise level exceeded 50%of the time representing an "average" sound level. L90 - The noise level exceeded 90%of the time,designated as a "background"noise level. The continuous equivalent-energy level is that level of a steady noise having the same sound energy as a given time-varying noise. The Ley represents the decibel level of the time-averaged value of sound energy or sound pressure squared and is the descriptor used to calculate the DNL and CNEL. B-3 B. Community Noise Equivalent Level(CNEL) The CNEL is a measure of the cumulative noise exposure over a 24 hour period. The CNEL index divides the 24 hour day into three subperiods, i.e., the daytime(7:00 am to 7:00 pm), the evening period (7:00 pm to 10:00 pm), and the nighttime period (10:00 pm to 7:00 am). Also, weighting factors of 5 and 10 dBA are applied to the evening and nighttime periods, respectively, to account for the greater sensitivity of people to noise during those periods. The CNEL values are calculated from the measured Leg values in accordance with the following mathematical formula: CNEL=[[(101ogio(10EL*'-7)))x 12]+[((10logio(10E 71o»))+5)x 3]+[((101ogw(10E 1o"M))+10)x 9]]/24 C. A-Weighted Sound Level The decibel measure of the sound level utilizing the "A" weighted network of a sound level meter is referred to as "dBA". The "A" weighting is the accepted standard weighting system used when noise is measured and recorded for the purpose of determining total noise levels and conducting statistical analyses of the environment so that the output correlates well with the response of the human ear. 3. Instrumentation The on-site field measurement data were acquired by the use of one of the instruments specified below, which provides a direct readout of the L exceedance statistical levels including the equivalent-energy level (Leg). Input to the instrument was provided by a microphone extended to a height of 5 ft. above the ground on using a tripod or mast. The "A" weighting network and the "Fast" response setting of the instruments were used in conformance with the applicable standards. The instruments conform to American National Standards Institute (ANSI) standard S1.4 for Type I instruments, and all instrumentation was acoustically calibrated before and after field tests to assure accuracy. Instruments used for field surveys: Larson-Davis Model 812 Integrating Sound Level Meter Larson-Davis 2900 Real Time Analyzer Bruel&Kjaer Model 2231 Precision Sound Level Meter B-4 4. Building Shell Controls The following additional precautionary measures are required to assure the greatest potential for exterior-to-interior noise attenuation by the recommended mitigation measures. These measures apply at those units where closed windows are required: Unshielded entry doors having a direct or side orientation toward the primary noise source must be 1-5/8" or 1-3/4" thick, insulated metal or solid-core wood construction with effective weather seals around the full perimeter. Mail slots should not be used in these doors or in the wall of a living space, as a significant noise leakage can occur through them. - If any penetrations in the building shell are required for vents, piping, conduit, etc., sound leakage around these penetrations can be controlled by sealing all cracks and clearance spaces with a non- hardening caulking compound. Ventilation openings shall not compromise the acoustical integrity of the building shell. B-5 APPENDIX C On-Site Noise Measurement Data and Calculation Tables CNEL CALCULATIONS CLIENT: ANIL GERA FILE: 47-002 PROJECT: GIGLI CT. DATE: 4/1-2/2015 SOURCE: INTERSTATE 280 LOCATION 1 1-280 LOCATION 2 1-280 Dist.To Source 400 ft. Dist.To Source 417 ft. TIME Leq 10^Leq/10 TIME Leq 10^Leq/10 7:00 AM 66.6 4570881.9 7:00 AM 63.4 2187761.6 8:00 AM 65.5 3548133.9 8:00 AM 62.4 1737800.8 9:00 AM 66.2 4168693.8 9:00 AM 61.4 1380384.3 10:00 AM 65.5 3548133.9 10:00 AM 60.0 1000000.0 11:00 AM 64.3 2691534.8 11:00 AM 58.6 724436.0 12:00 PM 64.5 2818382.9 12:00 PM 58.5 707945.8 1:00 PM 63.0 1995262.3 1:00 PM 58.5 707945.8 2:00 PM 64.1 2570395.8 2:00 PM 59.6 912010.8 3:00 PM 64.8 3019951.7 3:00 PM 60.6 1148153.6 4:00 PM 64.7 2951209.2 4:00 PM 59.9 977237.2 5:00 PM 60.7 1174897.6 5:00 PM 57.3 537031.8 6:00 PM 64.1 2570395.8 SUM= 35627873.6 6:00 PM 61.2 1318256.7 SUM= 13338964.5 7:00 PM 63.5 2238721.1 Ld= 64.7 7:00 PM 60.5 1122018.5 Ld= 60.5 8:00 PM 61.3 1348962.9 8:00 PM 57.8 602559.6 9:00 PM 60.9 1230268.8 SUM= 4817952.8 9:00 PM 57.5 562341.3 SUM= 2286919.4 10:00 PM 59.9 977237.2 Le= 62.1 10:00 PM 56.7 467735.1 Le= 58.8 11:00 PM 58.0 630957.3 11:00 PM 53.7 234422.9 12:00 AM 55.1 323593.7 12:00 AM 50.1 102329.3 1:00 AM 52.1 162181.0 1:00 AM 48.1 64565.4 2:00 AM 51.0 125892.5 2:00 AM 46.5 44668.4 3:00 AM 48.6 72443.6 3:00 AM 44.9 30903.0 4:00 AM 53.1 204173.8 4:00 AM 49.6 91201.1 5:00 AM 59.8 954992.6 5:00 AM 56.0 398107.2 6:00 AM 64.1 2570395.8 SUM= 6021867.5 6:00 AM 60.3 1071519.3 SUM= 2505451.6 Ln= 58.3 Ln= 54.4 Daytime Level= 75.5 Daytime Level= 71.3 Evening Level= 71.9 Evening Level= 68.6 Nighttime Level= 77.8 Nighttime Level= 73.9 CNEL= 67 CNEL= 63 24-Hour Leq= 62.9 24-Hour Leq= 58.8 LOS ALTOS HILLS AT s .1 3III _AT 4 PLANNING AND BUILDING DEPARTMENT ?7s "�k 26379 FREMONT ROAD LOS ALTOS HILLS, CA 94022 < y _°; (650) 941-7222 FAX: (650) 941-3160 CALIFORNIA MITIGATED NEGATIVE DECLARATION The project described below has been reviewed in accordance with the California Environmental Quality Act(CEQA)and has been determined to have a less than significant effect upon the environment. Project Title: Gera Subdivision; File#51-15-TM-IS-ND Project Location: The project site is located at 12345 Gigli Court, Los Altos Hills, California. The property on the east side of Gigli Court near the terminus of the street and directly west of Interstate 280 in Los Altos Hills; APN#182-04-075. Project Description: The project is a request for a tentative subdivision map to subdivide one parcel totaling 2.85 gross acres into two parcels for development of single-family residential homes: Parcel A = 1.42 acres; Parcel B = 1.40 acres. Access to parcels A and B is provided directly off Gigli Court which is a public road. The lots will have separate septic systems and water service will be provided by Purissima Hills Water District. All new power and utility lines within the subdivision will be placed underground. Determination: The attached Initial Study has been prepared for the above project in accordance with the CEQA procedures established in the CEQA Guidelines. On the basis of the Initial Study, the Town of Los Altos Hills makes the following determination: The above project could have a significant effect on the environment, but WILL NOT have a significant effect in this case because the attached mitigation measures will be implemented by the • Town of Los Altos Hills to avoid the effects or mitigate the effects to a point where clearly no significant effects will occur. Furthermore, there is no substantial evidence before the Town of Los Altos Hills that the proposed project, as mitigated, may have a significant effect on the environment. A MITIGATED NEGATIVE DECLARATION is hereby approved. Mitigation Monitoring Program Mitigation measures included in the project to avoid potentially significant effects are included in the attached Mitigation Monitoring Program. Further information about this project and about its probable environmental impact is on file at the Town of Los Altos Hills Planning and Building Department, 26379 Fremont Road Los Altos Hills, California 94022. Tel (650) 941-7222. Signature: � Date: 1D-ec (rJ 2015 Suzanne Avila, AICP, Planning Director Attachment: Mitigation Monitoring Program • ATTACHMENT 5 CITY COUNCIL TOWN OF LOS ALTOS HILLS 26379 Fremont Road Los Altos Hills, California MINUTES OF A REGULAR MEETING Wednesday, October 5, 1977 cc: Reel 105, Side 1 , Tr. 2, 355-End, Side 2, Tr. 2, 001-041 Mayor Pro Tem Lucile Hillestad called the Regular Meeting of the City Council to order at 7:32 PM In the Council Chambers of Town Hall . A. ROLL CALL & PLEDGE OF ALLEGIANCE: Present: Mayor Pro Tem Hillestad, Councilmembers Cheney, Proft and McReynolds Absent: Mayor Brown Staff: City Manager Robert Crowe, City Attorney Frank Gillio, City Engineer Alexander Russell , Engineer/Planner John Markl , Commissioner Stewart for the Planning Commission, Deputy City Clerk Susan Buttler Press: Iver Davidson, Los Altos Town Crier B. CONSENT CALENDAR: Requested by Councilman McReynolds to remove Item 4 a) for separ e consideration. MOTION SECONDED AND CARRIED: Moved by Councilman Proft, sec. •ed by Councilman Cheney and carried unanimously to approve the balance of Consent Calendar, specifically: I . Approval of Minutes: September 21 , 1977. r2. Approval of Warrants: $45,849.06. 3. Motions for Adoption: a) LANDS OF COSTELLO, File TM #2067 , Setting October 19, 1977 as Public Hearing date for appeal . b) LANDS OF FEISTEL, File TM 863-77, Setting October 19, 1977 as Public Hearing date. 5. Resolutions for Adopts• a) Resolution #107• -stablishing the right-of-way width of Magdalena Avenue 0 and prohibiti• of on-street parking. b) Resolutio. 1075 approving increase in Garbage Service Rate Schedule. c) Resolu •n #1076 considering lot line change, Lands of Freeman. d) Re ution #1077 for the implementation of Federal Aid-Safer Off-System .ds Program. There er, discussion followed on: 4. .) LANDS OF MARDIROSIAN-THOMAS, File BSA #6089-76, Request for Building Site Approval application. I Cv CITY COUNCIL MINUTES - October 5, 1977 E. SPECIAL ORDERS: (Continued) 4110 MOTION SECONDED AND CARRIED: Then moved b by Councilman Chen approve Lands of Newman, File TM # o conditions as recommended by the Planning Commission. .ssiom ` e) Request for Tentative Map Approval, LANDS OF GIGL1 , File TM #2059-77. The Town Engineer/Planner introduced this item, outlining the panhandle on Lot 5, noise problems caused by the proximity of l .S. 280, the fault trace and wide zone of potential ground rupture and the steeply sloping nature of this area. Paul Nowack, Engineer for the Applicant, asked that Lot 2 be eliminated from Condition 15. Commissioner Stewart explained the Planning Commissions concerns regarding both Lots 2 and 4 and the purpose of Condition 15. MOTION SECONDED AND CARRIED: Thereafter, moved by Councilman McReynolds, secon- ded by Councilman Proft and passed unanimously to amend Condition 15 to read: The factors of ground slope, potential seismic ground rupture and proximity to and noise pollution level of I .S. 260 shall prohibit any further subdivision of Lots 2 and 4. MOTION SECONDED AND CARRIED: Moved by Councilman Cheney, seconded by Mayor Pro Tem Hillestad and carried unanimously that a Notice of Negative Declaration be filed for Lands of Gigli, File TM #2059-77. MOTION SECONDED AND CARRIED: it was then moved by Councilman McReynolds, seconded by Councilman Proft and passed unanimously to approve Lands of Gigli , File TM # 2059-77 subject to conditions as recommended by the Planning Commission and, as amended by Council . F. NEW BUSINESS: Councilman Cheney cited the recent publicity regarding pro axes and offered to arrange for a speaker at the next Council meeting t cuss "Initiative Con- stitutional Amendment - Property Tax Limitation". Mayor Pro Tem Hillestad requested the Cit nager install a curve sign on El Monte, by Foothill College, as a pre tive measure against the number of accidents occurring in that area Councilman Proft asked the e City Attorney initiate a change to Section 9-5.503 of the Municipal Code biting concrete or cement block walls around subdivisions. G. ADJOURNMENT: There be o further new or old business, the City Council adjourned at 9:58 PM to t next Regular Meeting, October 19, 1977. Respectfully submitted, Susan Buttler Deputy City Clerk AU Dema appear.. as £J .ed on ,the Agenda.. -5- Y�.�yS"� , }l }n.,�� '.gyp • ' .._.._.. .1(Ogr)4.14,10.4..., .. .-14, ..f.e.%.,V,4..•-. ..''' . si441( .:aa. -Triter, ' ',:' Nee ntaittild IpAN3!1Y}+{!pA1 �iti, RI1A4�A1FNf°F#3f { akatF '. tk,«.t., 111111 01111400 MtlAn, 1,041 0,k4tlN 1i164►k 1tAkINNyN1 yaiiih 111��1111 r1 ` ` 1 TINTATIVt f� f �IRt1111 '`'. AAP n ;=: atAgEljagSgIll .' .: �`�� September 30, 191/ , 110N0fU10LC K YOR MD CITY COI CIL f120141 Cl1/1f11�1, Pd1YNq CQ{SNZSSi0ry �` ;3 S IJCCTi LMES OF,QIQL1, filo 9TH 20$0.17 rl:i' • Locations Clena !load " m�ri Frank 01 11 �.. . MN No.' 142.4.0 r,; Ararat 10,Y0,1 Acres Gross, 10.0'11+ Het ; :.:, 1ho Plenninti Condition, at 1tt atlet1npp of Soptnr)11r 14, 1077, riacornmnd�rd ;, of the above request subject to the following conditions! Approval ` �^ Ia l A , • 1, A fin,a1 strlli ro 4ort :hall ba aeeo ,llshod by a soils engineer etby 'l'• Ordinance No. 23 a defined 7'` ► Section 0 4,604. -,; .,� a. Final soils report uhhll tctitirt►gs the Tonttltivtt hp, rlatad f,4,�, r. .s . shall oneor aas:, but not bo l iml ted to, foundation eopion. cite OrepAratiot d ii,`. itto and roectit&yr ildino, readoay pav�►rInt design) :1to c► i' sleets stability of tho proposed hillside Lots 2, 3, and gr maga, end punsral Y y, ) te.b' final :aIle rbt►ort shall be subrnittGd for review an ....` Engineer. Additional conditions a bo ir;asad bas�daonrfindings.the City 5 �� i.r c, Final soils report t,xist be submitted prior to the acceptance of the r ,, b the Lily Council . anal ,c,� d, In the itibtnnco of tt H h1y naoativn tlnal ><Atls report, nut �� ,rccacdlal trcatant, the Tort ray+ enjoin bulldin capable of 2. Vuturu strcicturos on the proposed lots 1,2, one 4 shalirbe loutodram ain� issued, t ,•anty.flvo tent structural setback shown on tUn Tentative: Kap, 11111 �r the J totback sh:11 be fitment! rid on the applicable site d4rveioprant plans }} dinane a Ile, 23' Section &Md,tibl and field lctatc o (Ordinance ' ' `' , +t►t the tiara or construct on, d t a queliflad engineering twolo�ist 5 !,i, 3, Al ) seismic i,av,rd zones end etructural satbau; ureas shall be deo ► final hp, inatod by the '' 4. All x;!,11 c u • utility i ty 1�'prove:tints shall bo underground (tirdln!nee do 411 - . oa �J 1 .+:C t c i,:: 6� � 7 i t 11S y 't. 1 � r �jj;;¢- ri' !L �� I'f r"r'+� �' r '��`� `' S, k<pp V i T"�+1 ,� • a 3 q1 ,t j i-' !�. ` S, ;tti d ♦1 t' ; f,°;S ra 4 I� ! �� i1C '�¢:� 4► 4 '3 w) v i. � !!d et'''j a • • ii 44 t�i.v s X41 -�1 ,f �'�,,•.1.1 :SM ` 'e r— ,-- . . f4' + :. �. ffi. Y �I k,7 j 1,:4 It.t ',' .. .. ".".e. '1.3* •t. _ .-' _ " . 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Loal ( ,a) > > *Ali yltd onllru tit EIJ a lon.tlsuo0 •tt zshKulad 'at . a ' c c :, •y puo z nal posodo,td iso oanlru on u1 sooual.iets J03 :t IU01101.11p03 ill JO It.trtrtduls 'spunoud opltio.td lou ((co 'tlutuase0 o0aulaap ,a4 i otvMs o5ttuls.tp 'aunidn.t pun0J6 ottittos 1ppualad wdat>< punaa8 jo s.ca Dace oyL *it, 4 uatlan.�ltuoa •soasoy ill �Q *4 o Jol.id Jooul6ui U1OL otjl Jo oollaaotcip otn l• pOtt'tllut oq ~f lo lv4sso,,nstou Butionytlb+ 'po.tlntat".t It put 'U9Y oi�olt.iaqut 03.4t*Aot *Wu oyl 1 lap of P Puce C t4Q1 uo .toclotoAQ oyl iCq pDlonpuoo oq ttR41 csAtans ponos V 9t (,NJ 1'"Y1 w 1N;iN ry 33S) '!/?itx/ faAvo tInt �nl► r� 71R10,01st' iilltifT9P))1PYPPI /iX AARA,kIPPAPAI PV A AVY/V �YMiAA4 'It •r 3 '100,111 01 tgnd V sI l.tnoa 11810 J0 oouold000a ott of .1n1.�d pay:116 oo olua:►nnnuctul oAaulv.ipp Ilist0it t!R pus poAQ►li& 0% oq [0141_ pDAo4►o4 oq 03 1,tIAln3 414.43uo0 8ullotxo 044 'Pt ili‘ ytpL y n. rA { � rry ,, ? (ponulauo3) � �1 1PuoJ y r s, t 1 ttY • ilkan 1 Al ,;.it 1 K04.1 .,;".`-'01,f4,, t atad Y r' ItP t-. it 890! Itti 611J 'IMO J ' '1131403 A.1,13MN NOAYN �l11, 01, ( 141 .A1,:.P,a;f4,; , e'..1, _,,, ' . .... „-. '.:4',, y d �`�Y,.... e,, .r."�... I+.h'f,..::C:+f`.,Yr1.4.•c�`�. " ;6a: ,} F "IT4f; y :.1. !I k tdr,.r 4� ,.e ' e 4t • -.::,,r, • � -1 t o^tl:` 7 Wit 5 y( { -•':P'C +,+ t' �1; F i t aPr" rPt'� �r 'F r ('" ^##1 r �` a�' � !.��"d ,i�r ;r ,t�' ' `{ E. , '-.1,(1, jawt.i !, •i Sri 4 r r ;'PtC.-r f ,t f1 r' ` rl �,,. F k atF i g. ti t fi a- A } ;! I'. ' y l�r ,y ) P + F'• - �a g( f. 1a: .�,i7KC,'[;,yea ..,.. �r�'�F, 7i c r7t+;tNh �r ."p„y r it iyji i t L+ i � j.(.y,tX. � ° of ! i° .4 FIFA TO T}�� Ft,1Y6PK AND CITY COUh'C71. r � a� �' , �. 1 { , w ,a s4 a , i+ ' s a Lends,.of Giglio File #711 2d59.7� +3a e . , ,. P 1,,. K ' r ` y .,, Pap four 1 ' ' All Commissioners present entad for the reeaasaondation of approval for the Lands of Giglio , APPROVED: _ ' 1 • ,.: PLNIt11H4 SS 4 1 • 111tt \:�.1.1,1 t . \11 iiK , 1 ,1. 1 1t ct 1 [iIl[ ! �;.., \tttal• KKK , te \ K \ .10 ' 1 , t, \ t Ir t r 15'. Dated P�,115f / 7 /X r+ A . s • a• APPROVED BY THE CITY COWCIL AT THEIR REGULAR MEETING OF CCT0 R S, 1977, SUBJECT .TO CCND I T I CN S AS REC0'4-ENDED BY THE PLAtiN 1 NG CC4H I SS I CN AHD, AS A IENCED BELOW: a CONDITION 15: The factors of ground slope, potential seismic ground rupture and , , r r proximity to and noise pollution level of i.S. 280 shall prohibit f � t▪, + any further subdivision of ' is 2 and 4. ,f!-,f.��xs i r 0,.: Nye :r# i R xx •a r e- i fat, '11./t,;#_,{ le41.- +t `£'” •S'-.Y{, r 4,4,-, ti4 kiss 2y D- +; _ F 4-1.-„,',4;.,-. t � 3 s` • it �� s ti , 4 t. ti � x;, a t} c d i-0 + i i i `t t, fJ -.1,;-,,,',:.' !:„Li. }ani Fy ! ,r".4 --5,,,4` Y !.: +:. r y� .• 3a '� ' Ka'\ .., r! t4 f. .., `'- ,r- � t} S• kir,` ' + . i '` ` • „,,,..-:..;;,C;,w M.` ti K,,' � ;.K y ,' �, .,-,1E .�i � 1`' t,;:'rt-ice •4 : r - it r. i a .E'..-.J41.'. i.'' -}`TarB 1,...1:„.:,.,..,:„ vl ?f• , �-jrr A I.d � i �`S It:,� ..iti:;,.,.-7�'• y ,,r 1'41':11 : .'..*4 tri ” ;4(4. . R' / s �. i x � f' ,� y ;- qpp F , ;� z..,-,04i.,.4:- t � � l�lfEO. , a� Y 1fa s} t. ti i tt}>2 ,, + 42,4,44'..,t''. H ' Iry•,,.; • -.,.••„,#4,;,,-;,.,-,4.,._•„,+ '' ig •` '�:�' !e . flCITY w,a�CIL ATTEST: • #y'�'• ' , f - . -t. •r`.r'• t'• &�,�r�� ...��:r�X'Y' tS:. ' , fee/c—• Ai.). by,- ,..• ) ',../ x t'.a yo_r Fro e afcjr t"� a w di. 1 ,7 i X �• r3sr �. � ' :1! • ad '` t4, fx " ' f ,+�tA't Pv r d i + x - to'. u itP . 1 A" _ . A i 4 ,Iii,', 1 + r iY • i f t ! 1 ; t• ` f. t ''' 1,10 ,1 , —F K :: �, 4 1 tv,f , _i , - / 555 :I of 'r iy , ' "e"' .} 4.r /f � , t PLANNING COMMISSION MINUTES - September 14, 1977 Page four PUBLIC HEARINGS: (continued) 2. LANDS OF GIGLI, File File #TM 2059-77: (continued) Mr. Crowe responded that rolled curbs and gutters were installed as a usual practice, but vertical curbs and gutters were installed in some instances to match_vertical curbs already installed and in other instances to accommodate an increased water run- off where rolled curbs and gutters would not be adequate. Commissioner Stewart questioned about trenching for the fault line, and inquired specifically about debris on the surface below the pool area on Lot 2. Both Mr. Markl and Bud Chor, Engineer for the Applicant,cited the first three conditions as covering the need for adequate soils and geologic work for the subdivision. Commissioner Carico expressed concern that there be further safeguards, citing Mr. Cotton's letter of August 31. The following motions were passed: MOTION SECONDED AND CARRIED: It was moved by Commissioner Carico and seconded by Commissioner Stewart that an additional condition be added: The factors of ground slope and potential seismic ground rupture shall prohibit any further subdivision of Lots 2 and 4. AYES: Commissioners Carico, Stewart and Van Tamelen NOES: Commissioners Dochnahl and Kuranoff ABSTAIN: None PASSED BY CONSENSUS: Amend Condition 2 by changing the beginning of the condition to ' Future structures' and deleting "fifty foot" for the structural setback and replacing it with '25 foot' . PASSED BY CONSENSUS: Amend Condition 9 by deleting "septic tank or cesspool" at the end of the condition and replacing with 'pit privy' . PASSED BY CONSENSUS: Amend Condition 15(a) by changing the lot numbers at the end of the sentence from "Lots 4 and 5" to ' Lots 3 and 4' . MOTION SECONDED AND UNANIMOUSLY PASSED: It was moved by Commissioner Dochnahl and seconded by Commissioner Carico that an additional condition be added: A sound survey shall be conducted by the developer on Lots 3 and 4 to determine the noise level from Interstate 280, and if required, mitigating measures shall be installed at the discretion of the Tom Engineer prior to the construction of the homes. MOTION SECONDED AND UNANIMOUSLY PASSED: It was moved by Commissioner Van Tamelen and seconded by Commissioner Carico that Lands of Gigli , File #TM 2059-77 be recommended for approval with conditions as amended. MOTION PASSED BY CONSENSUS: It was moved by Commissioner Stewart and seconded by Commissioner Dochnahl that a Negative Declaration be recommended for the above request. At 9:50 P.M. a recess was called; the meeting resumed at 10:00 P.M. . The following item was taken out of order from the agenda because of its brevity and the relative length of the remaining items. PLANNING COMMISSION MINUTES - September 14, 1977 Page three PUBLIC HEARINGS: (continued) 1. LANDS OF COSTELLO, File #TM 2067-77 (continued) Beverly Brockway, Developer, spoke to the Commission and urged them to reconsider denial of the subdivision application, stating that lots were not gerrymandered, and cited reasons in rebuttal to the Commissioners statements on the faults with the proposed subdivision. John Riley, Engineer for the Applicant, stated that the subdivision conformed to ordinance requirements, that excellent building sites existed on all the lots, and stated that six tenths of an acre was provided for dedications for almost five lots. He urged that if the subdivision conformed to the ordinance it should be approved. John Markl discussed with the Commission the problem of providing dedications and good road access if the subdivision were limited to four lots. Commissioner Stewart stated that while the subdivision did conform to ordinances, it was in conflict with the General Plan and the probability was that it would be rejected by the City Council because the development was too intense. There- after the following motion was passed: MOTION SECONDED AND CARRIED: It was moved by Commissioner Dochnahl and seconded by Commissioner Kuranoff that the Lands of Costello, File #TM 2067-77 be recommended for denial without prejudice for the following reasons: The tentative map as sub- mitted is not a well-planned subdivision; there are too many lots too close together; the encumbrance of the land by the fault line and the swale would not create five lots; and there is excessive use of panhandle lots. Voting for approval of the motion were Commissioners Van Tamelen, Dochnahl and Kuranoff. Voting against the motion were Commissioners Carico and Stewart. 2. LANDS OF GIGLI, File #.TM 2059-77, Elena Road, Paul Nowack & Associates, Engineer, Request for Recommendation of- Approval of Tentative Map. Mr. Markl reviewed pertinent information on the above request, pointing to the fault zone and areas of steepness on some of the lots as major factors considered in the design of the subdivision. These items were discussed at length in his staff report of September 6. Commissioners asked questions about the length of the drainage pipe to be installed in the swale area , and Mr. Bud Chor, Engineer, stated the drainage pipe would be installed with a culvert intercept;- and that the exact size had yet to be determined. Commissioner Stewart asked if a conservation easement had been considered for Lots 2 and 4, and.Mr. Markl replied that it had not been. The hearing was opened to the public for discussion. Bud Chor, Engineer for the Applicant, requested that Condition 2 be amended to a 25 foot structural setback rather than the fifty feet in the condition. The public hearing was closed, and a review of the conditions began. In the discussion on Condition 1, Chairman Stewart questioned why vertical curbs and gutters were installed in some places and rolled curbs and gutters in others. 1 .'• • ''4) 4 4.1 ti n� t BOAS4 ys ' 2I370 /11CMOkT NOAO, LC)! ALTOS HILLS. CALIIO*? A 114021 �� y, eS-154iitr A h. DATE: Sep e r 6, 1977 ; e � SW � ' , Californiarna itF3- TO: Planning Commission d . J,531 0 1 ¢ FROM: John Markl , Engineer/Planner IA SUBJECT: LANDS OF GIGLI, Paul E. Hack & Associates, Inc., Engineer 10.70 ± Acres Gross, 10.02 + Acres Het it Tentative Map Checked 4-2-77 : Slope Density Cticulations Checked 8-1-77 Tentative Map Filed d-13-77 Subdivision Committee Meeting 5-3-77 Map Expiration Date Map Extension Date (118 days) 9 28 7 , ,,� REQUEST: Recoarrendation of approval of Tentative Map, File #T)1 2059-77. eta, .'.. LOCATION 1. Horth of the developed lands served by Adonna Court. 2. South of the partially developed lands served by Delson Court. 3. East of Elena Road. i 4. West of the undeveloped lands adjoining Junipero Serra Freeway. 5, See enclosed Assessor's Parcel Hap, APH 182-04-008, for area relationship, r' a'' s Appendix fl. = AA I. f _ BACKGROUND 4. 1. All of Lot 31 and a portion of Lots 32 and 33 of the rap of the subdivision of Lot 2 and part of Lot 1 of the Taaffe partition as recorded in Book H of raps, Page 76, Santa Clara County Records. 2. The subject site is featured by frontage with Eiena Road aloe boundary, near proximity with Junipero Serra Freeway and sliver westerly sot private property along the easterly boundary, a pronounced drainage scale and steeply sloped (>20%) portions over the proposed Lots 2, 3, and 4, several existing inprover& nts, including a residence, pool, pump house, wells, sheds, and a trace of the Monte 'lista Fault bisecting the property from i` north to south. See the enclosed Tentative Map, Appendix #2, and enclosed aerial rap for the location of these features and disposition of existing .,. structures. '� r c MEa ralattd' :l' F '.xX J laektortvmKrM4guksnt..... .... . _� rq ei k'',rtit'.r5.. ih+'-O A t i.� `. ..h- ".# �- ,.� Yq •L%"( ;iv ., . 1 T, ;q y�yfiy t .� , jj... ' ..� r J i..:to Yd „ %.,.'''.'i! .i..._ .1 4Ill�1�1.Itfti V0:1 tlir 1 F'I1��.,A-,, ;44.4,11,N„)10,. ' ,..A,,k .:a .404"44405'.1441"71r' p '� IA Ili MOS OF GIGLI, File ITN 2059-77 September 6, 1977 ilk Page two EVALUATION .z., 4.. t' .b., 1. Zoning and General Plan: This portion of the Town of Los Altos Hills is desi- ,Y nated-by tfie General Plan Diagram as residential-agricultural, with low to very '#°' low density, which permits the proposed development, The General Plan also A' SP invites that this property be required to exhibit the rural nature of Los Altos u Hills due to its proximity to JunipeSerra Freew .r.r ro only portions of the proposed Lots 2 and 3 are ay (page 17). Even though :,: visible, the aesthetic effect of ,t any new develeprrent ray be enhanced with appropriate structural design, tasteful ' landscaping, and the construction of intervening visual/noise barriers (foliage �1 or berms). 5,+ 2. Geology and Seismic Hazard: Extensive geotechnical investigations have been n. performed to accurately determine the location of the t'onte Vista Fault zone `'' traversingtheproperty. r'�}. The resulting available residential-structural building 4' area on the proposed Lots 1, 2, and 4 is designated on the Tentative Pap by a ,.ti 25-foot structural setback line n carrbination with the usual building setback ',. lines (ESL's). These building areas rust contain the inhabited or livino ,►i; structures only, and thoseproposed potential ;, portions of the ro osed lots within .t.., . rupture zones and residential setbacks may support tennis courts, horse stables, {1` detached garages, cabanas, etc.. This is especially significant on theproposed � . Lot 4 as a large knoll area within the potential xr fora standard 60 foot by 120 foot tenncourt. rupture zone is readily available ` y -.J.! 3. Lot Dessign and Development: The proposed Lots 2, 3, and 4 are restricted in vary-nr, degrees by tie factors of slope, a drainage swale, existing structures or wells, and a potential zone of rupture. Lot 2 is capable of further subdivision (see Exhibit A), but the area that will be available to the second lot is steeply sloping and immediate to the freeway. The topography of Lot 3 is sir!ilar, and �; L.1-' althoughlargein size, �V the future owners of these sites will be required to be content with only a conforming residence plus amenities subject to the difficulties 1.,:i ' ; rr of the slope, Lot 4 is also capable of further subdivision, but the cow `' fined Y , effects of rupture zone and extreme slope rake this Lvlikely indeed. In addition, ' ._�}'' the retention of an existing water well for the agriculturaluse of Lots 2 and 4 cif ' ` ' ” ` further restricts the installation of sanitary sewer drainfield within a radius ` of 100 feet as per Health Department requirements, However, as previously noted, i=;. Lot 4 is rzade particularly attractive by its u ique capability for a standard e tennis court. Lots 1, 5, and 6 present opportunities for development typical of '`'`' 1.0+ acre lots with a noteworthy restriction of non-vehicular access along $,; Elena Road frontage. q. 4. Subdivision Drainage: This parcel has a pronounced slope from Elena P.oad to the Junlpero Serra Freeway with the associated concerns of diverting drainage flows around building areas. This has been generally accccplished by the proposed con- kef struction of drainage pipe and the containzent of surface flows within the pro- f'k posed Gigle Court (rolled curb and gutter) without the excessive alteration of '1 . natural terrain. Portions of the drainage across this subdivision originate v- 4, , from the street area of Elena Road and the developed lands to the west. Drainage easements have been provided as required. ti;.} I. 5. Sioht Distance and Traffic Safet : Section 9-4.709 of Ordinance Ho. 232 rcquirts, a cen er nes n ersec n " g any street on opposite sides be separated by no ,' ; f. "^4t 'i't y �F,1' P7 r 1iTi ,u':i1 ? ;�'' !. i k 4 1i (Y �'�ti3'' '�,Gl ., Iit � refi pig 1 4 * e 33i ti ,,`..5 i �. ldt� p�t+ +M X9f ,tat} b,„. ;AI If i - 4 I. -AJ,r Fi;1 i e ,i -ztik,; e!4 ' t t. 4, i it. at. .. '',1',,.,0 Y:r p. 1 ii i+� A r ,a.r A �, i.., .T . ..r7' nAK �i•Mi�°i, ;'� 1'-7.a�tk.�`A i�, In " Y I E . �., ..•_.I, 0.21. C.A40,S � ` AI"yllT qt AI 'y% V-F.'' ''' f `�� .fir , MRS OF GIGLI, File IT11 2059-77 "x", - Septerber 6, 1977 ' " .. • Page three � • rt :_� r, EVALUATION (continued) Pr', less than 150 feet unless approved by the City Engineer with the concurrence of the Planning Cormission. The proposed Gigli Court and the existing Dawn Lane 4 s will have a lateral separation of approximately 160 feet and will satisfy the Code requirement. Also, the sight distance visibility of the proposed intersection g, to westbound traffic on Elena Road exceeds 350 feet which is sufficient stopping distance for speeds up to 50 riph under standard conditions. 6. _Pa_t_hways: Pathway requests (see Appendix 19) for this subdivision include 2-B path construction along Elena Road within the property line and 1-A native 's construction along the proposed Gigli Court. Staff evaluation regarding path construction is that sufficient pathway-roadwayq 9 plished separation would be accar�plished by a 1-A native path within the 10 foot portion to be dedicated along Elena Road. 4•: Additional 1-A native path construction along the northerly side of Gigli Court 4 (preferable side due to drainage) from Elena Road to the cornan boundary of pro- posed Lots 4 and 5 will provide for internal circulation. Ke easements are re- e quested or proposed. r "' ` TENATIVE MAP kiD SLOPE CCNSITY COMLIA'tCE i i-ALTO 1. The Tentative Map is in ccc liance with Tc Ordinance Ho. 232 form and 1. Y requirements. content . ;` 2. The subdivision, as proposed, is in coarpliance with Town shoe density require- ments, see Appendix #3. Two proposed lots within this subdivision are further subdividable as per Town slope density. I. 11, '"r'`' PECG 4JV(DATIOUS FROti REVIEWING AGENCIES . ' . 1. William Cotton, TaoGeologist x Reference File Letter, dated August 31, 1977. See ( Appendix #4) : 2. Doug Turner, Environrental Health Services c`! Reference File Letter, dated May 11, 1977. (See Appendix #5) 3. Stu Farwell, Los Altos County Fire Protection District 4 Reference File Letter, dated Harch 11, 1977.(See Appendix 96) ,, 4. Purissima Hills County Water District P.efea,ence File Letter, dated March 25, 1977. See Appendix a 1. 5. Pacific Telephone 8 Telegraph ` Reference File Letter, dated ' April 25, 1977.(See Appendix AS) ; . '" 6. Pathway Corn i ttee Reference File Letter, dated 4r11 25, 1977. (See Appendix #9) ac CO EN-TS FROM NEIGHBORi 4,, There have been no written cements revived or Verbal corireunications made to this 'I] office to date relative to the subdivision of this parcel. �. rWn-r•/InM'✓.��LL2. ,aI4 f f 1.'{+4:1Y{1�1•4:4Z' ., ef i. 4. t. LANDS OF GIGLI, File #TH 2059-77 1 September 6, 1977 Page four Rf CO 1EH DAT I ON If the information presented at the public hearing on September 14, 1977 does 10 not significantly alter Staff evaluation, the recacr+endation for approval of this Te ri ,e N•ap� the Planning Commission is encouraged, subject to conditi s. • 4111aXe.Ngllt 1, i { . Ji. IIARKL , •gineer/Planner ' 11/ebh • I It 1 .. s . 6,:: t - p} .. R. • t"„,i rt r . d i ti :r II; . u i.F . x .1,? 1••I•. b 1 4 vt re 1t4411111111011166° 0;4 i 14.—Ir3/110114Si: if I. 2111170 •wcwc t wo.a L.011 ALTOS Hrua, twirra4UtA f4O11 M•Yr 3 '. r Ir ` 111.7111 S 1 August 31. 1977 o California .` 41,, , ; ; '!v • Jlaal�� kl:, TO: John Karkl. Engineer/Planner P' ' FROM: William Cotton. Tam Geologist se, 'r a , SUBJECT: Lands of Gigli, file TN 2059.77 `{ el We have completed a retiew of the Tentative Kap. prepared by Paul E. harack and Associates dated (revised) August 23. 1977. 1, Conclusions and Recommended Action 401 . ::) �� The present revision of the Tentative Kap was undertaken in order to Fi, locate future home sites outside of the potential ground rupture C zone ofthe Monte Vista fault. As an additional margin of safety the 4,1, geologic geologic consultant has defined a 25 foot wide foundation setback zone ?; i outside or beyond the edge of the potential repture zone. Thus no itel residential structures should be permitted within 25 feet of the Monte Vista fault rupture zone. This requirement will only slightly restrict 'el development on lots 1. 2. 4 and 6. 1 We would reconeend approval of the Tentative Kap with the following 4, conditions: Ire- 1) G>_e_ o_ lc is Review - The present Tentative Kap should be reviewed by -tt►a--a-p_piicants geologist. The Town should receive a letter indicating that the location of the tential ptura zone and the residential setback lines are In cemp ante with his ricomorer - tions. 2) Soil Engineer Review - The project soil engineer (Durdhsre and -� Associates) should review and approve the revised zap in light 4,e of the preliminary reccer, ations expressed in his report of i""' June 15. 1977. 71i:tv It should be made clear that the geologic problesz related to the Monte Vista appear to have now been est ticated, however the actual construction ' ;,, of the proposed development should be carefully supervised by the project tg' `' soil engineer. All grading and foundation plans should be revienwed and i-> approved by the soil engineer prior to grading and building construe- tion. Likewise, all grading and foundation excavations should be inspected t by the soil engineer. t;1 Respectfully submitted,• 1 r3 � - , , �/Willias Cotton Town Geologist CEG 882ITtr',.*:,,,lit:'",,:,:::,,''', g , .FFL ' „ ; � . '4'g. b ,” t. '! 9" ' ,, dh, , i7iamattoY ''^Fns t F 3 dxrZi?tiiI ,:�i '4'3; . ' - IP' . 4 iri 1 t '•d 11,P `i : Richard Ro tt d 450 La Berl Streetis (415)3276225 } RECEIVED •• 47 77 C'Ct.SUL?INC ENGINEER= CECLCCIST • File 1.'o. July 26, 1977 JUL 2 s; 1977 TOWN OF LOS ALTOS F1LLS Mr. Frank Gigli 317 Miriam Street Daly City, California 94014 Subject: Supplementary Geologic Data in the Area of Lots 4, 5, and 6, Elena Road Subdivision. Dear Mr. Gigli: i In response to the review letter by William Cotton dated July 5, 1977, additional subsurface exploration was conducted in order to more accurately locate the fault line in the north portion of your proposed subdivision. Four test pits were excavated in the vicinity of the projected fault trace in the oast portion 1 of LotAnd three borings were drilled ,long the trete of Trench (1 (and Cross-Section A-A') near the border of Lots 5 .' and 6. This additional data enablod assmore accurate fix to be made on the fault within the northwest sector of the subdivision. The test pits showed the fault trace to pass through Lot 5 a few feet gest of the location shown in the original report dated June 10, 1977. The borings confirmed that Franciscan F . underlies the area of thick colluvium on the border between Lots 5 and 6, and the • fault appears to follow the "shellow+1 interpretation presented in the original cross-section. The Site Plan and Cross-Section have been accordingly revised and are attached herewith. A setback line is shown in the revised Site Plan for the entire length of the fault trace within the subject property. The setback width ranges from 20 to 40 foot depending on the proximity of the subsurface geologic data points. This width is hr►�t n�res d � 1.11X 4 partly on tl�she fact that the contact shear sone appears less than a few feet thick in Trench 02. Also the data points in the east part of Lot 5 and at Trench (2 allow the surface trace to bo located more accurately in those sectors. In addition to the revised Site Plan and Cross Section, a lar'ao- scale copy of the Site Plan for the northern sector of the sub- division is included for planning purposes, as well as logs of the additional borings and test p,.ts. Respectfully submitted, w �,e � '� i.: ; /chard E. Rowland<4 � , ' f, ,hP. , �. :;j4 r.�,: „"lie' ° „,!.1 C.E.G. (9 45 ,. b Fltt�iyVI r k y,. v; i' �r ....• S k`I�Y '��,�1.�'i'.Z1.11, '�� ''' V:kll�,tiil'A''�`Y ��,'.1�._.�� rt/�i.. �� !'AYwrAuie.r..c....:..-..... .`$ 1.` <' � al fi i,...x` � ,' �e,�w_�9r�.�. ._ ....- ---• - rt�",+ `"`-ai.� .,a:.0 area ,.n'.a ,.,. '.t?_"'.i:- - ,r Adgillpb, i c:>--.(0.4. ' i Cs !fill rII[►�OHT ROAD. LOf ALTOf HILLf. CAUFOIINIA faC32 4O ^" - v' ftt.TS21DATE: July 5, 1917 T0: John F1arkl , Engineer/Planner FROM: William Cotton, Town Geologist SUBJECT: 1AHDS OF GIGLI, File TM #2059-77 RE: Geologic Report/Soil Investigation Report RECEIVED,)U! 5 1977 We have completed a review of the Geologic Report on the Lands of Gigli, Elena Road, Los Altos Hills, by Richard E. Rowland, dated June 10, 1977, and the Soil Investigation Report !.. prepared by Dunham and Associates, dated June 15, 1977. SITE CONDITIONS F_ • I The subject property is characterized by gentle to steep hillside topography and is unser- ' lain by bedrock materials of the Franciscan Ccnplex and the Santa Clara formation. The ' ' contact between these two bedrock units is defined by the potentially active Monte Vista t., Fault, which appears to pass through Lots 1, 2, 4, 5 and, possibly 6. An exploratory trench (T-2) dug near Lots 4 and 8 and placed across the suspected position of this fault has exposed Franciscan bedrock faulted against Santa Clara materials. The iccation of this i ' fault is fairly well defined to the southeast of this trench location (i .e., Lots 1 and 2) S however, to the northwest (i.e., Lots 4, 5 and 6) the fault relationships regain very ccm-� plex and the position of the trace of the fault is not clear. According to the interpre- .4'. tation presented In the Geologic Report, the fault continues north of the exploratory .. trench and traverses the hillside region near the boundary of Lots 4 and 5, however, an `' equally valid interpretation would place the fault along the boundary of Lots 5 and 6. 1, The position of the fault in this position of the property should be located with greater accuracy prior to approval of Lots 5 and 6. This fault is considered to be a ;x _ n active fault and. therefore, the Tcwn Is not allowing residential structures to beplaced �. astride its trace. r RECOMMENDED ACTION We would recommend that the Tentative Kap not be approved until the following work has been. >': 1 completed. 4 1) Fault Location - The location of the trace of the Kont.a Vista Fault should be more accurately Tocated north of exploratory trench Ko. 2 (see Geologic Report) . This may be accaapllshed by additional sinal ' diameter borings placed along the crossk ' section line A-A' and by backhoe trenches placed across the projected fault trace 0,- at the east side of Lot 5. i? 2) Setback Ling► - The setback line from the fault trace, as defined by the applicant's consu ant, appears to be approximately 30 feet. The consultant should explain the geologic basis and criteria that was used to arrive at this setback distance (i.e.. , 30 feet). In addition, the setback line should be defined for the entire length of k ;l the fault trace. . 'i ' 1 . ;i . LA?{OS OF GIGLI 410 July 5, 1977 "'1' Page Two It should t,, ed that locuttng the fault trace in the region of Lots 5 and 6 will Le '� , difficult b". .,e of the covered surficial deposits (i.e., colluvium) and terrain, nevertheless, we believe Lot 5 is a very marginal site in the absence of additional M,. subsurface geology. The additional work may provide a more realistic evaluation of A the fault related hazards in this area. , , ; t-it This new geologic data should be reviewed and approved by the Tcwn Geologist prior ¢` to Tentative Kap approval . ,r. � / 1 ,f, [' C ecz,.>*-- C.e LST-' .3✓/,,,) , q,- ti William R. Cotton, 'CEG 882 . 40, , !*4.1 •:<`74 . ;x4. ; ,t . Tann Geologist . , , ref.: WRC/sj b yR .l tie. :; . • 1 Y • C, 1 1 • f 1 ,.l . • 11 >'1 f • `i 1 ' . 1 1,,, ,..t..,.• g..;.,•t. ril,e.1,.. ,. .1 .A- , ,,F,2. ,,,4 ..1 :4 . 1 2-2:422%,,:- -..-.2.'irr- . 4.;1.0. ..,--4,-,,,,,,,, 12.1 :2 .1 '''.‘1 ••'.f.it'..4'.1.-,..' ) 1—.. ',4,...et','''f.';',r1...,2:4,'',',.?.',.:''....C., - ',',.4.1.14.'AT,,,,,'c•'!,1'.'4•11,,,'al'',11 ,,,.i 4,',6.,11-11',t';1's,r,, i,-,1 i''',{,,Vii -; .. ..... f.,• q .,,, ,to,,..owii%.,441/11* I..:1'1,A4tift,l, ;:,.. -"i/...1”-e,'''. '; S il iiN . , . • - -,,,,.. :.., - -•. ,•.. ,, ..1 ect -(..it,----, ,tf. k--, - It a ,e, 0 ': i) :/.. S•'..,.1..7 ' . • • ' i. .,*PGEOLOGIC REPORT V„`V"441e-/ on •,'' .--4 .1'.,,',1'..iu • , ,,, •4',11_'" . Lands of Gigli) Elena Road, Lcs Altos Hills, . . , California iflpt' t 4• •.t1 ..: ..,1:‘.1::: • 1 , , I ',Vt, 4.' • I'i . ! . ', ..1.• 1 ttl.,N,# , , ‘, . „I.,: . x$ lokitio 442 . ‘.... . f• 00 • 1 AI,•'• ;e:,4 • . : . tlitite •-" ,..,h;f.'.%-,'•if by . :,..irt..... Richard E. Rowland •.1“,y,,,z.:, .:i• / •„...?v,..:;,• 1 . 'ilt!,'•':- . 1• 1. . I — ' I � , 1.. 450 Laurel Strreet`' • ` ' Richard E. Rowland - Menlo Park,Califcrria'94:25 (415)327-6228 t u t . y CONSULTING ENGINEERING GEOLOGIST ,: r File No. 47-77 `- ''yite s June 10, 1977 .a `, ,,,.'r:': "• • \1 _v 0.r FF1L.:: , d'E'yi' r R r• K x iq �$ l = Mr. Frank Gigli `�N �� . A : '*I317 Miriam Street 10l?,: APA Daly City, California 94014 tri 1*rte.. `,a• } Ff `. Subject: Geologic Report on Lands of Gigli, Elena Road, rkn"J', ;; " Los Altos Hills California. ;H� gr it Dear Mr. Gigli : is>a • kt .i As.`iyou requested, I have conducted a geological investigation >; of the subject property, and am submitting herewith a copy of '! . the resulting report. }i ', 0„�;fl My conclusions and recommendations are summarized at the end '", 4i� ,��+; of the report. Please feel free to contact me if you have isx any questions regarding my findings. It has been a pleasure It.. , to have been of service to you.„ , ' ',•)3• ,:kreA • ft,. Very truly yours, d'y- lk. { may: N dt r _ ...Li' - iyF,'ai • Richard E. Row and ''�``• l':., . C.E.G. # 945 '' '. C • n ;, : fid- 4 4 .. 3t; iso,' : , 4 4404i; r:i, .4:,9,04::. 4i F p�SZPa1n;S kr ' ,# tit° -3 -,e34i,. r 0 _ .� t{*ear ; � , 1 !_.'i `' GEOLOGIC REPORT 5 v en P. { Lands of Gigli, ;S Elena Road, Los Altos Hills .1 } c' Introduction ��F ;;. This investigation was requested bytheproperty ��. - g Q owner in order k-;.' to satisfy the recommendations of the Town Geologist, William ,�. .. Cotton, as outlined in his letter dated May 3, 1977 (File TM` - #2059.77 ) . The investigation was focussed on delineation of the l Monts Vista Fault trace. However the suitability of the parcel f for the proposed development was evaluated with respect to other geologic hazards as well. The proposed development is a split k into 8 parcels, as indicated in the Site Plan (Fig. 3). i";g,;; The investigation included the following steps: 1 ) review of I 1$A : • pertinent published and unpublished geologic data, 2) stereo- $' ' '"' ` scopic interpretation of aerial photos (1 :12000 scale flown 1 L 5/2/72 by Pacific Aerial Surveys, ser. nos. AV-1045-19-14 & 15), i �esr,�±„�X 3) geologic reconnaissance of site and adjacent vicinity, ,� i7�'�`a��'r� r ,. 4), subsurface exploration by backhoe trenching (3 trenches up ''` ` "' to 16' in depth, totaling ca. 270' in length), and 5) prepara- 3 tion of this report. . wi Site Description ti � The subject parcel is a roughly square parcel of about 650 by 4 " :: 750 feet, comprising about 10 acres on the east side of Elena Road. It lies about 300 feet north of Adonna Court and its '7'' r , southwest corner is opposite Dawn Lane. An existing residence ii Vi-k.' is located in the south-central part of the property, and the a� ',1,:>.f southern and western portions are being used as an orchard. 0_ Several large live oak trees and areas of dense brush are S i; ' located in the northern portion. Slopes are generally low to r pmoderate in most of the area and range from flat to about 7 :1 .,, (horiz. :vert. ). A 11 :1 east-facing slope is located in the ):4114‘. .. ; Y�:;. northernmost corner (Lot 5), while 4:1 east-facing slopes occur : • in Lots 3 and 4. A north-trending drainage swale passes through the property. An existing water well is in the north central section of the property. . y 4* i.•' -1- 7,,- i:,..„,,,,, ,,- •�a.1 14; . . ;f • . . , t , „. fix:4d 6 orig., }�"� r *�.� 3hy� afJ( ry 9 i.( +` . tf.�y At ''Hd i�Uy 'u'y� v, r�i +P` i a J�y,� 7. ,,,or �, F ;r,�3 L Y.i O"Z.:' t.''..��i1�C ��1' :t ' ; i, ... 4**�dt d�,. '1.44 qty . i+fi.RA �fe'!1i t��` ,Q " iie ii'k?l i`I�Y'z, - • 'ad',: Ks,. �,uF�: .. ,,� ..� -ra re 3 ,at/;:.,:::.:i..,02:', •• '.t G' .-4,;,..- ...-:si,t l,l '; i . 1t y. 1 1 i 41 ik,,fC • ' TSC.tt •• -, ce Geologic Setting 4 WV �., The site lies in the lower eastern foothills of the Santa Cruz Mountains at the point where Franciscan rocks (greenstone, r,*: serpentine, and metasediments) meet loosely consolidated k - Tertiary sediments (Santa Clara Fm. ), as indicated in the 1 =tr Location Map, Fig. 1 . The ' San Andreas Fault, the nearest historically active fault,' lies;;about 3.1 wales to the south- I : „5 = West (Ref.. 1 ). The potentially`. active Monta Vista Fault marks ,2•"` the contact between the Franciscan and Tertiary rocks in the site vicinity. The surface trace of this fault is veryirre M* ular in this area due to its low dip and the apparent erosion of some portions of the thrust plate. - It is well exposed 1700 • y'�. ,{ feet southeast of the site alongLa Barranca Rd., but its _} . location northwest of the site is poorly defined. Before this; t, investigation it appeared to trend northwesterly through thegL l' center of the site (Ref. 2). . a " :: • A distinctive red-brown clay topsoil and occasional "float" 5,,h rock indicated that relatively uncommon Franciscan limestone "`�� might underlie the western edge of the '�`� '• g property. This was ae,y verified by the recent development of the adjacent property, which exposed this limestone, along with some sandstone, near • the northwest corner of the subject site. TJL l No andslides have been mappeds in or near the site. i' Site Geology rr In order to delineate the fault line and the contacts between different types of bedrock within the property, three backhoe trenches were dug at the :locations ,indicated on the Site Plan, '' Fig. 3. ' The fault was found •only in Trench too. 2, where it 7 F ; � �`} was marked by;'a thin 2" zone oY sheared clay-shale and caliche. ,,+, '•' This zone separated mottled purple to 'tan, sheared clay and gravelly Franciscan debris on the west from highly fractured `: ry siltstones and claystones .1-: Tertiary e y to the east. No bedrock was found within the depth limit of trenching (161 ) in Trench #1 , however the type of colluvf.al' material indicated underlying i., bedrock to be Franciscan along the entire length of the trench. This was further substantiated by Borings A and B, which were " " drilled in conjunction with the soils report. These borings . penetrated Franciscan bedrock at depths of 13 to 15 feet. Outcrops of hard Franciscan rock also occur 40 to 60 feet ; r '� northeast of Boring A. A third trench was dug in the eastern ,r portion of Lot 1 to, verify Franciucan bedrock in that area. -, The fault location in Trench #2 .and locations of the outcrops • K' and borings in Lot 5 means that the fault must make a bend from • a northwesterly trend in the area of the existing dwelling to • a northerly trend down through the swale. Santa Clara Fm. "float" rock was found on the slope below the north corner of the site • rr -2. • i •i • ;'t ' indicating a bend of the fault back to the northwest at that 1 point. In Boring A a typical Franciscan rock type was encoun- tered in the depth interval from 13 to 36 feet: dark blue-gray sheared shale with hard fra • ents of metamorphic rock. The Pi' impervious nature of this material may explain why this boring R . was dry while Boring B had groundwater at 8' and the east end of Trench #1 had groundwater at 11 ' . From 36' to the bottom of Boring A, material more typical of Tertiary sediments was r'` F.;,,. - found: dark brown siltstone that was easily carved by a knife. Perhaps a low-angle plane of the fault mayhave been penetrated. Various possible interpretations of these relationships ars. * .,... illustrated in Geologic Cross Section A-A' (Fig. 2) . j " The limestone exposed in Trench #3 entire southwest edge of the probably extends along the 8 parcel to link with the exposure a _. in the southwest corner of Tract #5874. The red-brown pebbly clay overlying this unit appears to be moderately expansive. h 1 ,. f , Topsoil over the Santa Clara deposits appears to be thinner and r ' lighter in color. This was noticeable in traversing Trench #2; at the fault contact the topsoil thinned in an easterly direction ! from about 2' to 1 ' or less. Santa Clara Fm. was found in the 5 ;,,A. soil test borings for Lots 3 and 4, and it was also exposed in excavation for the concrete-block retaining wall east of the ; ,{ existing residence. 1 Trench #] revealed an area of very thick colluvium, with locally soft zones; however there was no caving of the trench walls. Groundwater occurred at depths of only 11 or 12 feet in this trench. Mr. Uhalde reports that groundwater in his adjacent ; .., property is only 4' deep, and that no perceptible drawdown has occurred in the six years he has used his water well. However ,- - at the time of this investigation no seepage was found in the j swale in the subject property. No areas of surficial sltr ping, 1 t,, landsliding or accelerated erosion were found on the property. ' I H m gt,- .. Seismic Considerations ' ` 4:, Because the irregular surface trace of the Monte Vista Fault in the site area may be due to a long period of uninterrupted erosion, this sector of the fault has been considered to be relatively inactive (Ref. 2, p. 40) . Hence the risk of potential i surface rupture is relatively low. It should be noted that the ' value of accurately locating the surface trace of an erosi.onailly incised, low-angle fault is diminished since there is less: likelihood of movement along existing fault planes and more likelihood of new ruptures forming during an earthquake (Ref. 3) , I II A greater probability of seismic damage within the subject: property comes from the risk of shaking. The site is in a seismically p y active area, and intensive shaking - should be anticipated a.t some • time during the expected life of the proposed residences. The source of the most intensive earthquake anticipated for the site is the San Andreas Fault. Maxi.'ntlm bedrock accelerations -3- .l', .,.. . '''. ' n1au.. ,'—„est. :5'a „t, .;,;:-:-.7,,i,.I(i '`+.l °'krzl` P.:LI wti'X('3ih MI 1 x'41 r?a' mm......,...r. m a � �a tt y7 R: , . a• m n fi u r +r n s . �� .y ...- r + _ :r+• <;`7,%� '�.n#'�' )� Y =,r. Si : t 114 f 'u Jlf r i t t ,Y. 1} t 1 '?'.,/ .tr i,t . nfr; V4. 5 .A ';• f3 -9 ii.•- 9-Y gr § , etS :. 4 • -i1� a 4 t i.i 1 e{ � t 1 f ~' S�i6 '0'3.0 ;:;.�s —� pus/moll •3 pasuoT2i "a ,r, i -1 -is rd . . 7•14t,t 1 •paTTdmT ao passazdxa as saT2usaasm aag2o TTs 3o nal/ uT sT Alusaasm s • , uoea BuTzaauTSua 3o pTaT3 auk uT saoT2oszd Tu,L •fSoToaB ATTBaauaB u2Th aauspz000e uT apatu uaauBssaTdsuoT.zd pe�da0os pus suoTuTdo TsuoTssa3o�d 30 $u q u T�sPuauauooa.z • I T�sTsuoO uoT2anTana sTUZ . ;`t , � x suoT2s4Tu,117 +�a • ',i t Y a� b s2o' uaaruaq 9[ t aur u �a ,, noTaq �tTa�sTpairT T T�no uTssp uLxo�s a�� -t sa dA/ dIa2sT ss ona aq2 3o; apsm aq pTnous `guTAad .,i7-,:!',,',_. ,0,0,_:,, u Tosauoo uoTso.za so3 uoTsTnoad y ( • 7 . '9 pus S s2o' so3 sptaT3uTs,zp OT2das pus-puno3 so3 su$Tsap alga uT sTanaT aa2sM unoaS g2suoTus s2Tsodap mnTnnTToa %aluz ao3 °pain a P u Tu Pus q PTnOus aouBMoTTY ( •£ i • 'PV:::C.'• uo sTg2 moa;�p1azsu alp aonpaa PTnous `usTd pais�au2 PU0 U Dns atm s•Y �upus ��oaO .zo3 sauTT x°$q2as $uTFTTnq n F*. •.• �uTns a o� T g• 30 2saa sdo.oano au3 3o assa , 4 = U uouaa/ 3o aTPPTm au2 uio23 au �'� ;. Tu$noa aTsms auk 30 aa2ua0 a P TT s uT rkl,,LS pus `�tasadosd Boa u� u o sucu �TgsQO�d �qns auz uT ' , , , axa2 oz puno; sar► u TM u�.zou aur o� puaq a t.. � .�� 2Tns3 s2sTA sauoJ alga 3o aos22 eq.', � a` '2no paT.zseo a.s asoda.2. sTTos alga pus 22oda.z s ,;•t °� pauTR uoo suoT2spuatIIin 3a z au1 �a Tui uT 1, s u PaPTno�d aTgs�Tnsrs�.. T earsaga au ta2T? alga ' .20; uRTd 2uaurdoTanap pasodozd ad u Tum punt); a.az spaszst� OTgoToa2 off ( . 1 `�` s;`o1ZYC�rI3l�uao03Ti CNV SNOISMONoo • �TQTssod Lew sa�smT�sa asa 'papaaoxa XT3alaq .zo XTTsoo1 aq 1,r . asoT� �CTaL uz ass a ua aosnos OT Tas P RdToTaus auk o� .r� T T STs auk aouTs '(S '3a2i) S9 .O pus (*7 •3d1 • $S•p ss pe2oTpa.zd �(TsnoTasA uaaq ansa saav Avg au2 so .°tl 3 Pad°adxa • i [ . . . a"` 1 tj,J; REFEREIr CES o y r, ,I. • tai 1 . ) "Geology of the Palo Alto Quadrangle,• Santa Clara rtl° and San Mateo Counties, California", by T.W. j ,r ,�tt Dibblee, Jr. , 1966, Calif. Div. of Mines & Geology, j "' ,� Map Sheet 8. F•rzA I qPM A 1 l` r.4;r 2. ) "An investigation of the potential for ground rupture • 1 ykp,,i7 along fault traces in Los Altos Hills, California" :I F'` by K. Sieh, 1975, unpubl. report for Town of Los .4,-;:,,,0*.',..4Altos Hills, California. r 3. ) "Patterns of ground ruptures in fault zones coincident ' : , with earthquakes: some case Histories", by G.B. ,-,,i::-4.,,,c.- Oakeshott, 1973, in Geology, Seismicity, and Environ- mental Impact, 'special publ. of Assoc. of Engineering i Geologists, pp. 287-312. { o 4. ) "Maximum credible rock acceleration from earthquakes 1 c`y:.:::,: in California", by R.W. Greensfelder, 1974, Calif. 1 ' ;^ � Div. of Mines and Geology, Map Sheet 23. .f`,.`} : 5. ) "Seismic hazard mapping of California", by A.S. , t, j , M rr Kiremidjian and H.C. Shah, 1975, The John A. Blume i• • 1 d 1. Earthquake Engineering Center, Report No. 21 . 1 • ti'•: 3 ratli; 1 1 -; • .,11..'t`31;'7,-:''''. ; 1 A k.:.. K.' • t '',i,. #,i . p -5- ._ .5- - ec �t .ti I 1�r� t'N',- � x04 .10f , 4 .1 wt kq d .' 5 4. � t ' ""' .� '1,9 .� `! Qr � �C dA � 2 � •;',= r� t., _ ;t:,c4 ��g,E�J1: iJv50. 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ATTACHMENT 6 CONSULTING ENGINEERS AND GEOLOGISTS December 21,2015 L5204B EC TO: Steve Padovan - -=J Planner DEC 28 2015 TOWN OF LOS ALTOS HILLS, TOWN OF LOS ALTOS HILLS 26379 Fremont Road Los Altos Hills,California 94022 SUBJECT: Supplemental Geotechnical Peer Review RE: Gera,Two Lot Subdivision #51-15-TM 12345 Gigli Court At your request, we have completed a geotechnical peer review of the proposed Tentative Map'Application using: • Preliminary Geotechnical Evaluation - Proposed Leachfields (letter) prepared by Murray Engineers, Inc., dated June 9,2015; • Limited Engineering Geologic Review - Proposed. Subdivision (letter-report) prepared by Murray Engineers, Inc., dated July 18, 2014; • Proposed Subdivision Tentative Map Exhibits (6 sheets, 20-scale) prepared by Lea&Braze Engineering, Inc., dated February 23,2015; and • Topographic Survey (1 sheet, 20-scale) prepared by Lea & Braze Engineering,Inc., dated January 14,2014. In addition, we have.reviewed pertinent documents and maps from our office files. DISCUSSION The applicant proposes to subdivide an existing 2.85 acre parcel into two new parcels. The proposed subdivision would create Parcel A to the south and Parcel B to the north. We understand that the existing one-story house on Parcel A (to be removed) extends into a mapped fault setback that was established as a result of a 1977 subdivision geologic investigation. We also understand that the existing site swimming pool is to be removed but that other structures within Parcel B-are to remain. Access to the proposed parcels would be provided by a revised "T" shaped driveway serving Northern California Office Central California Office Southern California Office 330 Village Lane 6417 Dogtown Road 2804 Camino Dos Rios,Suite 201 Los Gatos,CA 95030-7218 San Andreas,CA 95249-9640 Thousand Oaks,CA 91320-1170 (408)354-5542•Fax(408)354-1852 (209)736-4252•Fax(209)736-1212 (805)375-1050•Fax(805)375-1059 www.cottonshires.com Steve Padovan December 21,2015 Page 2 L5204B both parcels. Provided plans depict conceptual septic leachfield areas for the two proposed parcels within the eastern half of the property. In our previous geotechnical peer review (dated March 23, 2015), we concluded that the Project Geotechnical Consultant had adequately addressed the issue of potential site fault rupture constraints; however, we recommended that the Consultant evaluate the geotechnical feasibility of delineated septic leachfield areas and provide geotechnical recommendations for discharge of concentrated surface drainage. We noted that older aerial photographs suggested the presence of potential past shallow slope instability in the proposed leachfield area. Recent observations of adjacent slopes do not indicate geomorphology associated with landsliding. We understand that the County Environmental Health Department has provided preliminary approval of delineated septic leachfields. CONCLUSIONS AND RECOMMENDED ACTION The parcels to be created by the proposed subdivision are constrained by potentially expansive earth materials, the Monta Vista Fault, potential unstable steep slopes, and strong seismic ground shaking. The Project Geotechnical Consultant has completed a preliminary assessment of the risk of landsliding in the area of proposed septic leachfields and concluded that leachfields should not have significant detrimental impacts on slope stability. However, the Consultant recommends that geotechnical subsurface exploration be performed in septic leachfield areas (to confirm anticipated shallow bedrock conditions) prior to final approval of the subdivision. We do not have geotechnical objections to approval of the Tentative Map application with the condition that the following item be satisfactorily addressed prior to approval of the Final Subdivision Map: Geotechnical Exploration — The Project Geotechnical Consultant should complete recommended subsurface exploration within proposed septic leachfield areas to investigate the geologic and geotechnical viability of septic systems. The presence of past landsliding, depth of colluvial soils, and depth to competent bedrock materials should be determined. Appropriate geotechnical recommendations should be provided, as warranted, to address adverse conditions if encountered. Appropriate documentation to address the above should be submitted to the Town for appropriate technical evaluation prior to approval of the Final Subdivision Map. COTTON, SHIRES AND ASSOCIATES, INC. Steve Padovan December 21,2015 Page 3 L5204B LIMITATIONS This geotechnical peer review has been performed to provide technical advice to assist the Town with its 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. Respectfully submitted, COTTON, SHIRES AND ASSOCIATES,INC. TOWN GEOTECHNICAL CONSULTANT Ted Sayre (l Principal Engineering Geologist CEG 1795 6,0-j2_, David T. Schrier Principal Geotechnical Engineer GE 2334 TS:DTS:kc COTTON,SHIRES AND ASSOCIATES, INC. ATTACHMENT 7 Subdivision Committee Meeting Town of Los Altos Hills Council Chambers March 25, 2015 3:30 p.m. 1. Welcome/Brief project introduction: • Gera Subdivision • Proposal to subdivide a 2.8 acre property into 2 lots • Property located at 1234 Gigli Court • Sign-in sheet (please provide email or mailing address to be notified of future public meetings) 2. Round Table Introduction 3. Purpose of meeting: • Present comments from reviewing Town departments (Planning and Engineering), Town Committees inclusive of Pathways and EDPC, Town Geotechnical Consultant, and outside agencies including Fire Dept., Cal Water, and Dept. of Environmental Heath • Not a public hearing/no action will be taken • Public comment will be taken at the end of the meeting • Anyone who would like more information is welcome to come in to review the subdivision plans and file during business hours and/or may make an appointment with staff • Environmental review will be done for the project once the comments have been responded to and the plans are complete 4. Brief project description 5. Present comments from plan reviewers 6. Public comments 7. Adjournment ttS w z r� xf7> r 4) r ln iF 1 ., nf1 "-°,, vL r{ 10 R �f df nr — rlYN t4Vg,y f • �r )fV x r $ .f.a q4 rf P +hY1 .r @::; is if 2l3 � ,,( 'Sj1f xsr • -, V , ▪ i i 7 j s } LL k,i11, y�S 3, 7`1h k ¢f 1$ L `� li T f A�2.'yr J 4 i�q ri i h ti 7 f IPPV ,0?,;. '' NLYp tgtir'" nay:{ t'� rl k "`' ss, t N S u T Ui ra '• faa Hyi.}' y { -7, ,:jt4 • i� 'fir 3'u. �, x �� w f€ k• d j rNti>: ?r1 1 2 tr Sys ,lP �4gggyp{ r�(f,�t a�f;„ r• i ru c�, 34- - O,gVt n4��,o Of „+3 fq �c� r9 pl V 4 54 liu SyiL� r� 111 Y'34r1 y"tit .F'i4:' P n Gai�a:�:5,1..�a rJ ' Cynthia Richardson From: Asif Iqbal <aigbal2005@gmail.com> Sent: Tuesday, March 24, 2015 12:36 PM To: Cynthia Richardson Cc: Samina Iqbal Subject: Re: Lands of Gera Map Conference for March 25, 2015 Cynthia, We received the notice for Map conference for our neighbor, Lands of Gera application. Just wanted to reiterate our concerns that we sent below in our letter dated Oct. 26, 2014. All of the points we made in the letter are still our concern and we do not support any change in the current restriction regarding subdivision. Thank you, Samina Iqbal Asif Iqbal 12369 Gigli CT Los Altos Hills CA 94022 On Sun, Oct 26, 2014 at 10:05 PM, Asif Iqbal <aigba120050gmail.com> wrote: We are following up on the notice that we received in the mail for the conference on the Lands of Gera, 12345 Gigli CT, (File#326-14-PM-TM). Prior to receiving this notice we had no knowledge of this request. We have lived at 12369 Gigli with our 2 boys since we bought our house in April, 2011. Prior to moving to Los Altos Hills we had been residents of Los Altos since 1994 hoping that this would be the home we would live in and raise our children and grand children. One of the reasons to purchasing the property was the setting of our lot. Before purchasing our house at 12369 Gigli CT. in April 2011, we had reviewed the city documents and were reassured to find that the city ordinance of 1976 had ruled the surrounding lots "not-subdividable". This was assuring to us as our lot is wedged between the two non-dividable lots. As our lot is on a hill side with a steep grade, we are concerned about the impact of the insertion of an additional house on the topography and surroundings subdivision. This will also set a precedent for other properties in the neighborhood possibly requesting subdivision and having a negative impact to our property which is wedged between these two non sub-dividable lots. I am a physician and work at the Palo Alto Veterans Hospital. Having provided care to our Veterans for the last 20 years, I know that preventive care is essential in avoiding future problems. Further, changing plans in the midst of treatment with no clear reason often results in complications and unintended consequences drawing a parallel to the current application. In light of the above, we are deeply concerned that changing rules at this time will have an adverse impact to our home and surroundings in the future and are not in favor of the application to change the existing city rules for the sub-division of the said lot. 1 Regards, Samina Iqbal AsiiIgbal 12369 Gigli CT. Los Altos Hills CA 94022 650-823-8985 2 61/11 /15 To Whom it may concern We have examined the subdivision plans for 12345 Gigli Court with the owners Anil &Anita Gera. We have no objections to Geras pursuing this subdivision with the Town. As long as all the city regulations are met, it will not have any negative impact on our house. We support the Geras in their subdivision efforts and wish them Best of luck. Best Regards, Minnie Rohit v Owners 12300 Gigli Court Los Altos Hills, CA 94022 Cynthia Richardson From: Krishna Verma <krisverma@sbcglobal.net> Sent: Sunday, March 22, 2015 9:20 AM To: Cynthia Richardson Cc: Anil Gera Subject: Anil Gera's Land/Homes Plan Dear Cynthia, We have no objection about his plan, as long as it complies with City's all rules and regulations. Krishna B. Verma Asha D Verma Home owner 27300 Elena Road Los Altos Hills, Calif. 94022 1 ENVIROMENTAL DESIGN and PROTECTION ATTACHMENT 9 Application For: 0 -.LerUL, Applicant Name: E Reviewed by Pte. Date: COMMENTS Site Impact 71u2_ k-e. 1_,(3--Let Lighting �ui �t�� -� -��LE,L, �.�e�--zr c ?cj , `74 P �� a e_ � ��L t s Lam Noise rl Creeks �,Q, 4, i g c�, I. �= r Drainage tLi- anti LA-1 ke- Easements X11 � '_ Existing Vegitation ��{�C, i � - �;�, .. �, d Mitigation wlw: Volunteer-LAH 12/5/14 Pathways Committee Meeting Date: 2 3 /ll x r 4.0 /S File#: 67— /S — 7/V1 N pIVE Applicant Name: Gera ) .4 n; / a,1r' 4,, Property Address: / yS C;G 1,° C MAR 2 4 2015 Recommendation: `/ TOWN OF LOS ALTOS HILLS 1' In-Lieu Fee Notes/comments: s I)diet-A.5 ; Yk ce,//o We ) a;1 ?. pare Lot;. ( g '1 �.0i 1 c' ► rte- / z'iZ e ? . OY- / r 0 �3cz7' C4vSCc,Ylcar( IQ0-e i) lt'-11(cJ Ls /t` (1 C/1 Tr;Inf&ef . Z' ./1 •�'7 5 t r r fly S,"�I ii ✓7 Q0 /,p,r in Ar c� Ce. T 44,ci1/J I n Construct Type II B Pathway Notes/comments: Dedicate pathway easement Notes/comments: Restore existing pathway Notes/comments: • Other Notes/comments: • • Cynthia Richardson Onf?, - EP o.i) . From: Roger Spreen <roger@spreen.com> Sent: Monday, March 23, 2015 10:34 AM To: Cynthia Richardson Subject: Re: New Subdivision Hi, Cynthia: We introduced this at our latest Open Space Committee meeting. My main comment on this is that the proposed open space easement is quite unacceptable: someone has just drawn out a rectangular area and designated it "open space easement,"but it serves no useful purpose as drawn, as it is not connected to anything. It would be an "island" of easement area that would not be particularly useful. It must connect to adjacent properties. There is in fact an important reason to designate a useful open space easement area on this subdivision, because of its immediate adjacency to the freeway. It is *very* important that wildlife not be impeded in movement alongside the freeway; if for any reason wildlife is blocked from movement along the freeway, it is thus encouraged to try to cross the freeway, and becomes a severe and potentially life-threatening issue for humans driving on the freeway. As currently drawn,the proposed open space easement would allow fencing to block movement along this route. The key to making this open space easement serve the appropriate purpose is to have it stretch entirely along the edge of the property up against the freeway, prohibiting fencing to block movement along that direction. Every year about 40 to 50 deer are hit by vehicles on 280 (according.to a study at UC Davis funded by the CA DOT). In 2011, an assistant professor at Santa Clara Univ died on 280 after a highway accident on caused by a deer crossing the freeway. Midpeninsula Open Space District is currently working on wildlife crossings for Highway 17. Last year 280 acres were purchased in Santa Cruz County to build crossings there. Thus, the designated open space areas from this parcel needs to contribute to preventing fencing along the 280 corridor. Otherwise, this subdivision creates a dangerous liability, and the homeowners could share blame for any accidents caused near this area. At minimum, the designated open space area must have continuity to adjacent properties. —Roger On Mar 12, 2015, at 9:53 AM, Cynthia Richardson <crichardson@losaltoshills.ca.gov> wrote: Hi All, By now you may have picked up your packets for this new two lot subdivision. I wanted to give you a bit of background. The applicants are proposing to split their 2.8 acre parcel located at the end of Gigli Court into two parcels. The original subdivision (see attached map, lot#2) noted that this lot is not further subdividable. Town records indicate the City Council made this determination based on steep slopes, noise from 1280 and Geotechnical Hazards. The applicant has prepared several reports in support of amending the original map to eliminate this notation. I wanted to give you this information in the way of providing some background, however it does not have bearing on your review. I realize that we are asking for a quick turnaround for this project due to time limitations imposed by our Subdivision Ordinance. We will be holding a Subdivision Committee Meeting on Wednesday March 24th at 3:30. Please let me know if you have any questions or if I can be of any help to you. auvuthi.Ci R GhRrdsovt, PinAwl-Ln.q Cotits uita t Towvt,of Los Altos F-riiis PVI 05094-1-9222 Direct 0.50_94-7-2505 oricnnircisolt.c Losnitos✓iiiis.oci.00V office i-tou,r: Mowc{Cl j, Tuesda j avA4 Tinursdau www.losaltoshills.ca.gov <Transmittal Memo Committees Subdivision Meeting Date.doc><Tract Map 6763.pdf> 2