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HomeMy WebLinkAbout4.4 11.4 . TOWN OF LOS ALTOS HILLS May 10, 1995 Staff Report to the Planning Commission RE: NEGATIVE DECLARATION AND TENTATIVE TRACT MAP, LANDS OF LINDY PROPERTIES I; 27591 PURISSIMA ROAD FROM: Sheryl Kolf,Assistant Engine Michael A. Porto,Interim Pla Director RECOMMENDATION: That the Planning Commission: 1. Review and make comments on the Negative Declaration and proposed Tentative Tract Map including the attached findings and conditions of approval,as recommended by Staff. BACKGROUND: The review period for the attached Mitigated Negative Declaration for the proposed Deer Creek Subdivision extends until May 31, 1995. At this time, the Planning - Commission may make comments on both the Mitigated Negative Declaration and the Tentative Map but may not recommend certification of the Mitigated Negative Declaration or approval of the Tentative Map until the review period has ended. Comments have already been received from most of the outside agencies (which have been attached for your review) and all neighboring residents within 500 feet have been notified of this hearing so that their comments may be heard. After this hearing, Staff will address any concerns of the Planning Commission and public and will return at a meeting on or after May 31, 1995, as directed by the Planning Commission. • The project site is located within the Town Limits of Los Altos Hills in Santa Clara County. The site is comprisedof a trapezoid-shaped parcel consisting of 4.04 gross. acres. The parcel fronts onto the east side of Purissima Road, east of Junipero Serra Freeway (280),,and approximately 230 feet south of the intersection of Purissima Road and Elena Road. The project site is bounded to the west by Purissima Road and Town of Los Altos Hills property, to the south by a ± 3.3-acre parcel (developed with a single-family residence), to the east by Subdivision Tract No. 2895, and to the north by a± 11.96- acre parcel developed with a single family residence. Access to the site is provided by an existing unnamed dirt/gravel road (proposed Samuel Lane) off of Purissima Road, across a bridge over Deer Creek, which also leads to the single-family residence to the south. The western third of the site consists of primarily level topography, with slopes ranging from 0-10% (elevations of 85-95 feet) and up to 10-20% in the most southwesterly corner. Deer Creek, which runs in a south-north direction, is also located in the western third of the project site. Deer Creek is an un-improved channel approximately 10-15 feet wide and 5 to 10 feet deep with near vertical Lands of Lindy Properties I,Deer Creek Subdivision 4 May 10,1995 Page 2 banks. The banks are lined with stone blocks and the surrounding area is dense with vegetation. Numerous trees (mostly coast live oak and coast redwood) can be found along the ba I s of Deer Creek,extending the width of the property. The eastern o-thirds of the project site are characterized by two large knolls,rising in height to.approximately elevations 120 feet and 135 feet, respectively. Slopes on the knolls range from 20-30%. Several trees (mostly coast live oak and deodar cedar) are located othe large knoll located in the center of the project site. One large and three`smaller lateau areas are also found scattered throughout this portion of the site. The larg flat pad area is understood to have been the location of a now demolished ouse structure. An asphaltic concrete driveway exists along the southern side f the property,encroaching onto the adjacent southerly property,and leads up to the flat pad area. DISCUSSION The proposeproject is to subdivide a 4.04-acre parcel into three smaller parcels ranging in si a from 1.15 to 1.27 net acres for the purpose of constructing single- family reside ces. Also included in this application is the retrofitting of the existing bridge acros Deer Creek or replacement with a new bridge, if found to be necessary,built to Town and Los Altos Fire Department standards. All three lots of the proposed subdivision would be served by a proposed public roadway (Samuel Lane) which enters off of Purissima Road. Private driveways would extend off.of Samuel Lane to the 3 lots and the residence to the south. The proposed right of way width is shown to be 60 feet in order to accommodate the possible future subdivision of the property to the south; This southerly property could be subdividedinto a maximum of 3 lots. These additional lots would increase the total number of properties served by this road to a total greater than 5 which would in turn require a 60 foot right of way as opposed to a 50 foot right of way for a short cul-de sac. The road that is proposed for this subdivision(Samuel Lane)will include a hanmerhead design for the turn-around of vehicles and,fire trucks. If the property to the south subdivides at some time in the future,this.road would then be extended to s rve each of the new parcels and a new terminus to the road would be created. The dditional right of way that would be required on the Lindy property for the extension of the road will be irrevocably offered for dedication at this time but will not b accepted. A conservati n easement is proposed that would encompass Deer Creek, 25 feet from its tops f banks, and the approximate limits of the 100-year flood plain. This easement would have a width ranging from approximately 50 to 70 feet wide. This easement would also encompass the entire portion of Lot No. 2 that is located. between Purissima Road.and Samuel Lane. The Planning Commission has the authority to cilefine the specific restrictions for conservation easements. These restrictions w11 then be.included in a dedication document that is prepared by the City Attorney and referenced in the subdivision C.C.&R.'s. Staff recommends that no structures of any'type be allowed in this conservation easement with the exception oft e Town pathway, a footbridge for the Town pathway, and a single 4. Lands of Lindy Properties I,Deer Creek Subdivision May 10,1995 Page 3 footbridge to allow Lot No. 3 full access to the property on each side of the creek. Staff also recommends that landscaping within the easement be limited to planting and care of native non-invasive species and the removal of dead or diseased trees as recommended by an arborist and the removal of star thistle and poison oak. Although a 100-year flood plain does occur on-site within Lot 3 (encompasses Deer Creek), the proposed building footprint is located outside of the 100-year flood plain. Therefore,no impacts related to flood hazards are anticipated. The following table includes an analysis of each lot and its corresponding Lot Unit Factor (LUF), Maximum Development Area (MDA) and Maximum Floor Area (MFA) as required by Sections 10-1.5. 02 and 10-1.503 of the Town of Los Altos Hills Zoning Ordinance. TABLE 1 Lot# Net Acres Ave. Slope LUF - MDA MFA 1 1.23 16.4% 1.061 13,369 6,026 2 1.27 17.2% 1.083 13,320 6,108 3 1.15 11.7% 1.089 15,640 6,441 Source: Jennings,McDermott,Heiss,Inc. A tree survey report prepared by arborist Barrie D. Coate catalogued a total of 72 trees on-site. Of this total, eight trees are proposed by the arborists for removal due to death,poor health/structure,or damage/infringement on an adjacent tree. Seven additional trees are proposed to be removed as necessary for construction of on-site roadways and septic leach fields. This includes two coast live oak trees. The trees that are shown to be removed, that are located within the boundaries of the secondary leach fields, will not be necessary to remove unless the secondary leach fields are required to be built at some future time (due to failure of the primary leach fields.) Due to the number of trees remaining on-site, removal of the recommended trees for the bridge construction is not anticipated to result in a significant impact. Staff recommends that street tree planting be required along Samuel Lane to replace the removed oak trees since there are already an adequate number of trees along Purissima Road. A Noise Assessment was prepared by Illingworth & Rodkin, Inc. in May of 1992. That report concluded as follows: "The existing noise levels range from a 24-hour average day/night level (Ldn) of 52 to 60 dBA. Noise levels are not anticipated to increase in the future along this stretch of I-280. While the Town.of Los Altos Hills does not have specific guidelines related to outdoor noise exposure, their standards indicate that an Ldn of 60 dBA or less is compatible with residential development. This is typical of most municipalities in Northern California. The site's noise exposure is, therefore,acceptable for residential Lands of Lindy roperties I,Deer Creek Subdivision May 10,1995 .t Page 4 development without additional mitigation. The Town does require that interior noise levels n t exceed an Ldn of 45 dBA. Typical California residential construction provides 15 OA of noise reduction with open windows when going from outside to inside, and 20-25 dBA of noise reduction with the windows closed. Interior noise levels would also be in compliance without additional mitigation." This report indicates that there is not a need for additional noise mitigation for this subdivision. Staff does not recommend any noise mitigation measures beyond the typical requirements of the Building Department for site development construction. Sanitary sewer service is currently not available to this area which results in septic tanks and leachfields being the only available sanitary sewerage disposal. The acceptability each proposed septic leachfield site from a geotechnical perspective has undergon repeated review by Santa Clara County Department of Public Health and the Town Geologist, as can be seen in the attached letters. In the first letter that the Lindy Group received, dated November 10, 1994, the Health Department stated that the subdivision tentative map met all of their requirements. In December 1994, the Town Geologist recommended that additional wet weather percolation tests be considered fc$r this site. These 'tests were'then required by the County Health Department Is stated in their letter dated January 18, 1995. In the letter from the County HealDepartment dated March 22, 1995, the leach fields proposed for Lots No. 1 and 2 ere determined to be adequate for houses up to 4,500 square feet and four bedrooms. In a discussion with Linda Crawford of the Health Department, it was determir}ed that for the purpose of this tentative map a leach field system should be shown for a house with a square footage comparable to the maximum allowed for etch lot and with 6 bedrooms. We determined that a 20%increase in the required lead field size would be adequate for this purpose. The maximum number of bedrooms for each of the lots has consequently been restricted according to the areas and capacities of the available leach field sites. Lots No. 1 and 2 are each restricted to 6 bedroom houses while Lot No. 3 is anticipated to be restricted further to a 4 bedroom house. A final decision for Lot No. 3 is currently under review by the Health Department and will be required prior to approval of this proposed tentative map Staff recommends that these restrictions be recorded in the C.C.&R.'s for this subdivision so that potential property owners are aware of these restrictions. Los Altos Fire Department has reviewed this proposed subdivision and has recommends approval subject to the installation of a fire hydrant on Samuel Lane and replacem nt of the bridge (or retrofitting) so that it will support a 35,000 pound fire truck. T e Los Altos Fire Department has also required that residential fire sprinklers be _nstalled in any future residences and that fire truck turn-arounds be provided at the terminus of the driveways serving Lots No. 1 and 2. The proposed street name, Samuel Lane, is acceptable to the Los Altos Fire Department. J The Environmental Deisgn and Protection Committee has recommended that the Town Historian be consulted for a name that is significant to the history of this property and the area. Lands of Lindy Properties I,Deer Creek Subdivision May 10,1995 Page 5 The Pathway Committee has recommended that a type Ilb pathway be installed along Purissima Road within the public right of way. Improvements to the existing oak trees along Purissima,Road have also been recommended by the project arborist and so these two projects will need to be coordinated. The Pathway Committee has also recommended that the subdivider install a type Ilb pathway along the northerly property line and easterly line to a point where a future connection to Canario Way • may take place. This will require a 10 foot wide pathway for the entire length of the pathway. A portion of the easement from the flowline of the creek to a point approximately 200 feet easterly will be required to be 30 feet wide in order to allow for the construction of switchbacks so that the pathway slope does not exceed 10%. FINDINGS 1. The subdivision as proposed would create 3 lots ranging in size from 1.15 acres to 1.34 gross acres, with Lot Unit Factors of from 1.061 to 1.089. In this and all other respects, the lots conform-to the Town of Los Altos Hills Subdivision Ordinance. 2. The proposed subdivision would create lots which would meet the General Plan standards of one acre minimum net lot area for land with an average slope between 0 and 10 percent, and one acre to seven acres for land with an average slope between 10 percent and 50 percent, and in all other respects would be consistent with the General Plan. 3. Access to all three lots, in addition to the property to the south, is proposed off of a new public cul-de-sac off of Purissima Road. Adequate services, including septic, water, fire and police protection, are available to serve the subdivision, as described in the attached information and the Mitigated Negative Declaration for the project. All lots are physically suitable for the proposed development. The Town Geologist has stated concerns that can be addressed through mitigation measures and conditions set forth in the Mitigated Negative Declaration and conditions of approval for the project. It has been determined that each of the newly proposed lots contains a site suitable for building. Therefore,the site is suitable for the proposed density of development. 4. Since all significant environmental effects of the project as identified in the Initial Study for the project have been mitigated as discussed in the Mitigated Negative Declaration, the design of the subdivision and the proposed improvements are not likely to cause substantial environmental damage or substantially and unavoidably injure fish or wildlife or their habitat. 5. All significant environmental effects of the project as identified in the Initial Study for the project have been mitigated as discussed in the Mitigated Negative Declaration, and therefore the design of the subdivision and the proposed improvements are not likely to cause serious public health problems. Lands of Lindy Properties I,Deer Creek Subdivision :, May 10,1995 it Page 6 . 6. The Ci Engineer has reviewed the project and has determined that the design of the subdivision and the improvements will not conflict with easem ants, acquired by the public at large, for access through or use of, proper, within the proposed subdivision. Staff is available to answer an questions of the Planning Commission or public. Attachments: Staff Recommended Conditions of Approval Mitigated Negative Declaration L.U.F.,M.D.A.,M.F.A. Calculations Town Geologist review correspondance City of Los Altos Fire Department review correspondance Pathways,Parks &Recreation Committee recommendations Environmental Design and Protection Committee recommendations Santa Clara Valley Water District footbridge recommendations Santa Clara County Health Department correspondance cc: Lindy Properties I • Shannon Paboojian 12280 Saratoga-Sunnyvale Road,#101 Saratoga,California 95070 William Heiss . Jennings,McDermott,Heiss,Inc. 950 South Bascom Avenue,Suite 2111 San Jose,California 95128 Lands of Lindy Properties I,Deer Creek Subdivision May 10,1995 Page 7 STAFF RECOMMENDED CONDITIONS OF APPROVAL LANDS OF LINDY PROPERTIES I 27591 PURISSIMA ROAD Geotechnical/Earthwork 1. The project geologic consultant shall review and approve all geotechnical aspects of the subdivision plans to . assure that the consultant's recommendations have been properly incorporated as required by the Town Geologist. The results of the plan review shall be summarized in a letter by the project geotechnical engineer and submitted to the City Engineer for review and approval prior to final approval of the subdivision plans. 2. The geotechnical consultant shall inspect, test (as needed), and approve all • geotechnical aspects of the project construction. The inspections should indude, but not necessarily be limited to: excavations, grading, and trench excavation and compaction. The results of these inspections shall be described by the geotechnical consultant in a letter and submitted to the City Engineer forreviewprior to final project approval. 3. Non-engineered fill shall be removed, or if required to remain in its current location,shall be recompacted as engineered fill. The actual extent of removal shall be determined in the field by the Geotechnical Engineer during grading and shall be accomplished to the satisfaction of the City Engineer prior to issuance of building permits. 4. A subdrain shall be constructed in the axis of the swale on Lot 1, the extent of which shall be determined by the project Geotechnical Engineer in the field during grading. The subdrain, or approved equal, shall be constructed as shown in the Terrasearch Geotechnical Investigation report dated October 28, 1994 (Figure 2, Appendix A) and shall be accomplished to the satisfaction of the City Engineer prior to issuance of building permits. 5. Proposed residences shall be founded on a pier and grade beam foundation. The bridge structure and site retaining walls shall be founded on either a pier or a spread footing foundation system. Recommendations for both foundation systems are given in the Terrasearch Geotechnical Investigation report dated October 28, 1994. Upon construction of the foundations for each • lot, the bridge improvements and site retaining walls, conformance with the recommended foundation systems shall be verified to the satisfaction of the Town geologist and City Engineer prior to subsequent inspection approvals. 6. The surface of the areas to be cut and filled at the site shall be stripped cleared and grubbed to remove all existing vegetation and/or other deleterious materials. The actual depth of stripping is unknown and shall be determined in the field by the project Geotechnical Engineer. Stripped material from the Lands of Lindy Properties I,Deer Creek Subdivision ;r May 10,1995 Page 8 site shall not be used as engineered fill but may be stockpiled and used later for ladscaping purposes. Plans showing the exact areas to be stripped and depth7of stripping shall be submitted for approval to the City Engineer prior to issance of grading permits. 1 7. FollovYing site clearing, the area of non-engineered fill shall be removed to expose native ground. Keyways shall then be provided at the base of any proposed fill slope and shall be a minimum 1-1/2 times machine width, cut into firm native ground and sloped back into the hillside at a gradient of 5%. The fill area shall then be constructed by placing engineered fill as specified in mitigation measures 6, 7, 8, and 9. Benching into the native hillside shall be performed as the filling progresses. At this time, the construction of a subsurface drain at the back base of the key is not anticipated; however, the final determination shall be made in the field by the project Geotechnical Engineer. This shall be accomplished to the satisfaction of the City Engineer durin grading operations and prior to issuance of building permits. 1 8. All materials encountered on-site, except for debris and organically contaminated material, are suitable for use as engineered fill. Any large cobbles or boulders that are encountered shall be broken down to less than 6 inches in size for use in the fill. If the existing southern driveway is to be removed, the asphaltic concrete and aggregate base materials in the existing drivev ray pavement may be used for fill provided the asphalt is pulverized and the materialsare properly mixed with the on-site fill. The use of these mate4s in the upper 1 foot in landscape areas shall be prohibited. This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading operations and prior to issuance of building permits. 9. All engineered fill shall be placed in thin lifts not exceeding 8 inches in uncompacted thickness and compacted to a minimum of 90% relative comp ction at 2% to 3% above optimum moisture. Relative compaction is based on the maximum dry density.as determined by ASTM D1557-78 Labor tory Test Procedure. This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading ' operations and prior to issuance of building permits. 10. All unsupported cut and fill slopes shall not be steeper than 2:1 (horizontal to vertic il). Any cut excavation over 5 feet shall be observed by the project Geote9hnical Engineer to detect the presence, or otherwise, of any adverse conditions that may affect stability or retaining wall design. This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading operations and prior to issuance of building permits. 11. ' All fill slopes shall be over-constructed and then cut back to the design slope grade ensuring that all loose material is removed. (Track-walking of slope surfaces does not provide adequate soil densities and shall not be utilized as a t. Lands of Lindy Properties I,Deer Creek Subdivision May 10,1995 Page 9 method of slope compaction.)This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading operations and prior to issuance of building permits. 12. Due to the presence of soils identified as highly and critically expansive, detailed lot-specific construction plans shall be reviewed by the Town Geologist prior to issuance of site development permits and building permits, respectively. 13. The project geotechnical consultant.shall review all geotechnical aspects of site improvements illustrated on the current Tentative Map. Appropriate evaluations and/or subsurface investigation shall be completed to address the feasibility of the proposed house site on Lot 3. The potential need for removal/recompaction of existing fill materials in this area shall be assessed. The consultant shall comment on the acceptability of all proposed septic leachfield sites froma geotechnical perspective. The results of these evaluations shall be summarized by the consultant in a letter and submitted to the Town for review by the Town Geologist priorto approval of the Tentative Map. Land and Easement Dedication 14. A 10 foot wide pathway easement shall be granted to the public along the northerly property line of the subdivision from Purissima Road to the northeast corner of the property and then along the easterly property line to a point 10 feet south of the property line between 12489 and 12829 Canario Way, to the satisfaction of the City Engineer. The easement to be granted shall be widened to 30 feet at the location from the flowline of Deer Creek extending easterly for a distance of 200 feet to allow for the installation of switchbacks. The easement shall be kept clear of obstacles, vegetation and obstructions. The dedication shall be accomplished as part of the subdivision Final Map. 15. The Final Map shall provide for the requested easements to all utility companies, including but not limited to: Pacific Bell, Pacific Gas & Electric Company and cable television. 16. The subdivision C.C.&R.'s shall be reviewed by the City Attorney for approval of the conditions and restrictions concerning the restriction of a house design with maximum allowable bedrooms as recommended by the • County Health Department for proposed Lot No. 3, and the restriction of house designs with maximums of six bedrooms for proposed Lots No. 1 and 2. The C.C.&R.'s shall also indicate that fire sprinklers are to be installed in all new residences for these proposed properties, that the driveway designs for Lots No. 1 and 2 shall be designed for a fire truck turnaround at each terminus, and that the foundation design for Lots No. 1 and 2 shall be restricted to type II foundations as defined by the Town's Municipal Code. Lands of Lindy Properties I,Deer Creek Subdivision :o` May 10,1995 Page 10 17. The ap licant shall dedicate to the Town of Los Altos Hills a 30 foot half- street public right-of-way along the subdivision frontage of Purissima Road. The dedication shall be accomplished as part of the Final Map to the satisfaction of the City Engineer and shall be accepted at this time. 18. Vehicular access for Lots No. 2 and 3 shall be restricted from Purissima Road and shall be accomplished as part of the Final Map to the satisfaction of the City Engineer. 19. The applicant shall dedicate to the Town of Los Altos Hills a 60 foot public right-of way as shown on the Tentative Map as Samuel Lane (or a name as approv d by the Town and the Los Altos Fire Department.) The dedication shall beaccomplished as part of the Final Map to the satisfaction of the City Engine and shall be accepted at this time. 20. The applicant shall make an irrevocable offer of dedication to the Town of Los Altos Hills for the additional 60 foot public right-of-way connection from Samuel Lane to the property located to the south as indicated on the Tentaive Map. a irrevocable offer of dedication shall be accomplished as part of the Final M p to the satisfaction of the City Engineer and shall not be accepted at this tim 21. The app icant shall abandon the existing 20 foot wide access easement along the southerly property line as indicated on the Tentaive Map. The abandonment of the access easement shall be accomplished as part of the Final Map to the satisfaction of the City Engineer. 22. The app1 icant shall grant public utility easements and public utility access easeme is to the Town of Los Altos Hills where needed within the subdivis'on for utility construction and maintenance to the satisfaction of the City En ineer. This will provide access for installation and maintenance of the public water system. The dedications shall be accomplished as part of the Final Map to the satisfaction of the City Engineer. 1 1 23. A cone ation easement shall be granted to the public over Deer Creek,for a 25 foot idth from the tops of bank on both sides of the creek, and to encomp ss the limits that have been calculated for the 100 year flood, to the satisfac on of the City Engineer. The easement to be granted shall also cover the entire portion of Lot No. 2 located between Purissima Road and Samuel Lane a. indicated on the Tentative Map. The dedication shall be • accomplished as part of the subdivision Final Map. The City Attorney shall prepare a dedication document that defines the restrictions of the conservation easement as identified by the Planning Commission. Improvements • 24. A proje t grading plan which includes an approved drainage and erosion control Ian to minimize the impacts from erosion and sedimentation shall be k Lands of Lindy Properties I,Deer Creek Subdivision May 10,1995 ' Page 11 submitted to and approved by the City Engineer prior to issuance of grading permits. This plan shall conform to all standards adopted by the Town of Los Altos Hills and shall comply with all appropriate requirements of the Town's NPDES permit relative to grading and erosion/sediment control including, but not limited to: a) restricting grading during the grading moratorium from November 1 to April 1;b) protecting all finished graded slopes from erosion using such techniques as hillslope benching, erosion control matting, hydroseeding; c) protecting downstream storm drainage inlets from sedimentation; d) use of silt fencing to retain sediment on the project site; e) any other suitable measures outlined in the Association of Bay Area Governments (ABAG)Manual of Standards. 25. Construction of proposed pier foundations, spread footings, slabs-on-grade, retaining walls, driveways, and utility trenches shall occur as recommended in the Terrasearch Geotechnical Investigation report dated October 28,1994 or as indicated by the City Engineer. This shall be accomplished to the satisfaction of the Town Geologist and .City Engineer prior to further inspection approvals. 26. The applicant shall be required to apply forand receive a Creek Alteration Permit from the California State Department of Fish and Game prior to issuance of grading permits. This shall be accomplished to the satisfaction of the City Engineer. 27. The applicant shall be required to apply for and receive a permit from the Santa Clara Valley Water District for the bridge improvements or replacement prior to issuance of grading permits. This shall be accomplished to the satisfaction of the City Engineer. 28. The site drainage associated with the proposed development must be designed as surface flow whenever possible to avoid concentration of the runoff. The applicant shall construct drainage improvements within the subdivision boundary to the satisfaction of the City Engineer. The proposed drainage shall be designed to maintain the existing flow patterns. The applicant shall verify that the existing creek has adequate capacity, to the satisfaction of the City Engineer. If inadequate, the applicant shall improve the creek to the satisfaction of the City Engineer. All drainage improvements shall be constructed or bonded for prior to recordation of the final map. 29. The acceptability of all proposed leachfield sites and capacities shall be provided by the Santa Clara County Environmental Health Services Department to the satisfaction of the City Engineer prior to Tentative Map approval. 30. Fire protection improvements, including the installation of a fire hydrant on Samuel Lane (or street name as approved), shall be constructed as requested by Los Altos Fire Protection District. Improvements shall be constructed and ready for use prior to the recordation of the Final Map or be bonded for. Lands of Lindy Properties I,Deer Creek Subdivision `'. May 10,1995 Page 12 31. The existing bridge over Deer Creek shall be retrofitted or reconstructed to suppot a fire truck with a weight of 35,000 pounds as requested by Los Altos Fire Protection District. Improvements shall be constructed and ready for use prior to the recordation of the Final Map or be bonded for. 32. All t ee lots within the subdivision shall be connected to the public water system as part of the subdivision improvements. A water main shall be install d to serve the subdivision to the satisfaction of the City Engineer and the Pufissima Hills Water District prior to the recordation of the Final Map or be bonded for. Any necessary fees shall be paid prior to recordation of the Final Map. 33. All utilities located within the subdivision shall be placed underground, in accordance with Subdivision Ordinance, Sec. 9-1.1105. Cable television is included in this requirement. Plans for location of all such utilities are to be included in the improvement plans for the subdivision. Improvements shall be installed prior to recordation of the Final Map or be bonded for. 34. A Type IIB pathway shall be constructed along the westerly property line of • the supdivision within the Purissima Road right of way and shall be constructed within the proposed pathway easement along the northerly property line. A pedestrian bridge shall be constructed at the Deer Creek crossing to meet the requirements listed in the letter from the Santa Clara Valley(Water District to Wiliam Heiss dated March 14, 1995. Pathway marker posts shall be installed at the end of the pathway at Purissima Road indicating that the pathway does not connect to another pathway or public street. Switchbacks shall be installed where necessary so that the pathway slope oes not exceed 10%. Improvements shall be constructed prior to record tion of the Final Map or be bonded for. 35. The applicant shall design roadway improvements for Samuel Lane (or street name 6.s approved) to the satisfaction of the City Engineer. The terminus of the roadway shall be designed as a turnaround that is adequate for a fire truck, to the satisfaction of the City Engineer and Los Altos Fire Department. Improvements shall be constructed prior to recordation of the Final Map or be bonded for. 36. Street rees shall be required along Samuel Lane (or street name as approved) and sh 11 also be required to replace the oak trees that are removed for the constr ction of the bridge, to the satisfaction of the City Engineer. Trees shall be planted prior to recordation of the Final Map or be bonded for. Planning and Zoning • 37. Any,'a, d all,wells on the property shall be shown on the Final Map and shall be pro erly registered with Santa Clara Valley Water District and shall be Lands of Lindy Properties I,Deer Creek Subdivision May 10,1995 Page 13 either maintained or abandoned in accordance with their standards and approval. 38. Payment of Park and Recreation fees and all other applicable fees shall be required prior to recordation of the Final Map. 39. Fees shall be collected in accordance with AB 3158, Chapter 1706, Statutes of 1990, effective January 1, 1991 requiring that the Department of Fish and Game impose and collect filing fees as specified to defray the cost of managing and protecting fish and wildlife trust resources,if applicable. 40. Samuel Lane (or street name as approved) addresses shall be assigned and approved by the Town for all three lots as required by the Los Altos Fire Department and in accordance with the Town's policies. 41. All subdivision conditions of approval and subdivision improvements shall be constructed and approved by the City Engineer prior to issuance of any site development permits. 42. 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 approval of the subdivision. 43. 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 grading permit for subdivision improvements. The grading/construction operation plan shall address truck traffic issues regarding dust, noise, and vehicular and pedestrian safety on Purissima Road, Elena Road, and other surrounding roadways; 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 Los Altos Garbage Company forthe debris box, since they have a franchise with the Town and no other hauler is allowed within the Town limits. 44. Prior to beginning any grading or construction operations, all significant trees shall be fenced at the dripline. The fencing shall be of material and structure to clearly delineate the dripline. Town staff must inspect the fencing and the trees to be fenced prior to commencement of grading or construction. The fence must remain in place throughout the course of construction. No storage of equipment,vehicles or debris shall be allowed within the driplines of these trees. • 45. A Mitigation Monitoring and Reporting Program (MMRP) to include methods for monitoring and reporting of mitigation measures set forth in the Certified Mitigated Negative Declaration is required as part of the approval Lands of Lindy Properties I,Deer Creek Subdivision May 10,1995 Page 14 of this subdivision. The form and content of the MMRP shall be submitted by the property owner for review and approval by the Planning Director and the City En ineer,prior to recordation of the final map. FEES Storm Drainage (To be determined) Street Improvement .(Tobe deter fined) Path Improvement (To be determined) Parks a d Recreation (To be determined) Dept. of Fish and Game $1275.00 TOTAL April 28, 1995 TOWN OF LOS ALTOS HILLS LEGAL NOTICE OF RECOMMENDED MITIGATED NEGATIVE DECLARATION AND PUBLIC REVIEW PERIOD AND PLANNING COMMISSION PUBLIC HEARING The public review period has been opened for the following recommended Negative Declaration (Neg. Dec.). The review period to receive comments will . extend from May 1 to May 31, 1995. #95-01 Neg. Dec. -Proposed Negative Declaration for Lands of Lindy for the proposed 3 lot subdivision of 3.928 acres,located at 27591 Purissima Road (Assessors Parcel No. 175-43-034). On or before May 31, 1995,any interested person may present written comments to the Planning Department. The first public hearing will be held by the Planning Commission of The Town of Los Altos Hills to receive comments on the Negative Declaration (Neg. Dec.) on May 10, 1995 at 7:00 p.m., in Council Chambers located at 26379 Fremont Road. Under California Government Code Section 65009, if you challenge the nature of the proposed action in court, you may be limited to raising only those issues you or someone else raised regarding the matter described in this notice or written correspondence delivered to the Town at or prior to the date and time of the determination. For further information or to receive a copy of the Negative Declaration, contact Debbie Pollart or Mike Porto,Interim Town Planners,Planning Department, 26379 Fremont Road,Los Altos Hills, CA 94022, (415) 941-7222. i••bie Pol art/Mike Porto Interim Town Planners Town of Los Altos Hills CI{QA:CALIFORNIA ENVIRONMENTAL QUALITY AC; Initial Study and Checklist (To be completed by Lead Agency) • Tito of Proposal: AP - —, V 121oK J Date Checklist Submitted: MQ TI, 1 C71 631. • 7 Agency Requiring Checklist: 1O:7 ) of k 7 7 AL:T�i - )- 11-,1-G7 • Agency Address: /210�� I Z 9 t- - '17-0.4A:7 City/State/Lip: _� = ir► _ '�/2 Agency Con act 1 l-t-4 /il I n Phone: 1-1,----->7. 2[1:2,Z22 DETERMINATION • (To be completed by the Lead Agency.) On the basis of this initial evaluation: a) I find that the posed project could not have a significant effect on the environment,and A NEGA DECLARATION will be prepared .. ❑ b) 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 the mitigation measures described on an attached sheet have been added - to the project. A NEGATIVE DECLARATION will be prepared ... c) I find the proposed project may have a significant effect on the environment,and An ENVIRO AL IMPACT REPORT is required 0 /"."--1/1 & Signature Print Name For Daat If s CEQAM CALIFORNIA ENVIRONMENTAL QUALITY ACT Initial Study and Checklist (To be completed by Lead Agency) Title of Proposal: d— y1 1oKJ 1 Date Checklist Submitted: �AY 1, C21Qr-2 - , Agency Requiring Checklist::jocvKl or-- j 7 v ,4L""y�1 IL-,L. 7 Agency Address: / (0 City/State/Zip: _' or,'" Agency Contact: 'LIbl z� :i2 -4�tzr/�1 I O Phone: �t����►-��22 DETERMINATION (To be completed by the Lead Agency.) On the basis of this initial evaluation: a) I find that the proposed project could not have a significant effect on the environment,and A NEGATIVE DECLARATION will be prepared 0 b) 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 the mitigation measures described on an attached sheet have been added to the project. A NEGATIVE DECLARATION will be prepared c) I find the proposed project may have a significant effect on the environment,and An ENVIRONMENTAL IMPACT REPORT is required 0 4(' Signature Print Name For DaaT CEQAM CALIFORNIA BNVIR'ONIMENTAL QUALITY ACT ,, 51 t ENVIRONMENTAL CHECKLIST FORM • PROJECT LOCATION: Lz i. A t'-- O t t..I-h C +A +ityCounty PROJECT ADDRESS: 2� 1 •i%Z1��I MA 17-C4417 - 1-6K-2.6L-r- OLL-4-7 , . . DESCRIPTION OF PROJECT: /yj-- t. hj \J'1.,—�t771\-.3 _ "--Ail... "_....--i-4 1 L ,4 --1-4. 1.\,04--7 . 6)-/--- --A' _- .1.Com- om , -_ cam . 8 K 1 :--r). 1—�1' 1-2->'P / I F- I JEc- - ` 1. ENVIRONMENTAL IMPACTS: (CEQA requires that an explanation of all"yes"and"maybe"answers be provided along with this checklist.including a discussion of ways to mitigate the significant effects identified.You may attach separate sheets with the explan ns on them.) Yes Maybe No I.EARTH.Will the proposal result in: a) Unstable earth conditions or in chang in geologic substructures? [17 0 0 b) Disruptions,displacements,compacti n or overcovering of the soil? Er/ 0 0 c) Change in topography or ground surf ce relief features? le0 0 d) The destruction,covering or modify • 'on of any unique geologic or physical �../ features? 0 0 ID/ e) Any increase in wind or water erosio of soils,either on or off the site? 0 . [a' 0 f) Changes in deposition or erosion of • • hsands,or changes in siltation, deposition or erosion whichmay modi y the channel of a river or stream or the bed of the ocean or any bay,inlet or I: e? 0 li 0 g) Exposure of people for property to geo ogic hazards,such as earthquakes, landslides,mudslides,ground failure, .r similar hazards? 0 0 II.AIR.Will the proposal result in: • a) Substantial air emissions or deterio : on of ambient air quality? 0 0 (d b) The creation of objectionable odors? 0 0 [i c) Alteration of air movement,moisture,or temperature,or any change in climate,either locally or regionally? 0 0 d III.WATER.Will the proposal result in: a) Changes in currents,or the course of •' : tion of water movements, �/ in either marine or freshwaters? 0 0 Cid I ; CBQA3 CALIFORNIA ENVIRONMENTAL"QUALM ACT c b) Changes in absorption rates,drainage patterns,or the rate and amount of �.,/ surface runoff? ll 0 ❑,/ c) Alterations to the course or flow of flood waters? 0 0 L_�J,/ d) Changes in the amount of surface water in any water body?, _ ❑ 0:LJ e) Discharge into surface waters,or in any alteration of surface water quality, �/ including,but not limited to,temperature,dissolved oxygen or turbidity? ❑ (tG ❑( f) Alteration of the direction or rate of flow of ground waters? ❑ g) Change in the quantity of ground waters,either through direct additions or withdrawals,or through interception of an aquifer by cuts or excavations? 0 0 ri. - h) Substantial reduction in the amount of water otherwise available for public water supplies? ❑ 0 ri i) Exposure of people or property to water related hazards such as flooding ,_ or tidal waves? 0 0 Ii IV.PLANT LIFE.Will.the proposal result in: -.._ . a) Change in the diversity of species,or number or any species of plants __,__/z (including trees,shrubs,grass,crops,and aquatic plants)? 0 0 Dili b) Reduction of the numbers of any unique,rare,or endangered species of plants? 0 0 DI c) Introduction of new species of plants into an area,or in a barrier to the normal replenishment of existing species? 0 0 _ / d) Reduction in acreage of any agricultural crop? 0 0 LJ V.ANIMAL LIFE.Will the proposal result in: a) Change in the diversity of species,or numbers of any species of animals (birds;land animals,including reptiles;fish and shellfish,benthic organisms or insects)? 0 0 i b) Reduction of the numbers of any unique,rare,or endangered species or animals? , - 0 0 [2( c) Introduction of new species of animals into an area,or result in a barrier to the migration or movement of animals? 0 0 liz d) Deterioration to existing fish or wildlife habitat? 0 0 VI.NOISE.Will the proposal result in: a) Increases in existing noise levels? - 0 0 b) Exposure of people to severe noise levels? ❑ 0 VII.LIGHT and GLARE.Will the proposal: a) Produce new light or glare? 0 0 VIII.LAND USE.Will the proposal result in: a) Substantial alteration of the present or planned land use of an area? 0 0 IX.NATURAL RESOURCES.Will the proposal result in: a) Increase in the rate of use of any natural resources? 0 0 d X.RISK OF UPSET.Will the proposal involve: a) A risk of an explosion or the release of hazardous substances(including, but not limited to: oil,pesticides,chemicals or radiation)in the event of an ,_,/ accident or upset conditions? 0 0 Li b CEQA:CALIFORNIA ENVIRONMENTAL QU , ACT , b) Possible interference with an emerge y response plan or an emergency - evacuation plan? 0 0 d ' XI.POPULATION.Will the proposal: a) Alter the location,distribution,densit or growth rate of the human population of an area? XII:HOUSING.Will the proposal: • a) Affect existing housing,or create a . and for additional housing? 0 0 [y XIII.TRANSPORTATION/CIRCULATIO .Will the proposal result in: a) Generation of substantial additional v hicular movement? 0 0 (4b) Effects on existing parking facilities, •r demand for new parking? 0 0 0/ • c) Substantial impact upon existing . . .station systems? 0 0 GI d) Alterations to present patterns of circ 'on or movement of people ,_f and/or goods? 0 . ❑ LTJ e) Alterations to waterbome,rail or air ic? 0 0 at f) Increase in traffic hazards to motor ve ides,bicyclists,or pedestrians? 0 0 ( XIV.PUBLIC SERVICES.Will the proposal , e an effect upon,or result in a need for new or altered govrnniental service in any of the following areas: . a) Fire protection? 0 0 (iJ b) Police protection? 0 0 [d c) .Schools? 0 0 [v d) Parks or other recreational facilities? 0 0 94 z e) Maintenance of public facilities,inclu.' g roads? 0 0 [ f) Other governmental services? 0 0 (J • XV.ENERGY.Will the proposal result in: a) Use of substantial a founts of fuel or e ergy? 0 0 [r b) Substantial increase in demand upon e isting sources of energy,or require the development of new-sources of en gy? 0 0 [✓f XVI.UTILITIES and SERVICE SYSTEMS.Will the proposal result in a need for new systems,or substantial alteratio to the following utilities: • a) Power or natural gas? 0 0 (2 b) Communications systems? 0 0 Eli c) Water? 0 . ❑ ®' d) Sewer or septic tanks? 0 v1" 0 e) Storm water drainage? 0 0 [la/ f) Solid waste and disposal? 0 0 Of . XVII.HUMAN HEALTH.Will the proposal r suit in: a) Creation of any health hazard or poten : health hazard(excluding mental health)? 0 0 2i b) Exposure of people to potential health azards? 0 0 0/ CEQA:CALIFORNIA ENVIRONMENTAL QUALITY ACT XVIII.AESTHETICS.Will the proposal result in: a) The obstruction of any scenic vista or view open to the public? 0 0 (� b) The creation of an aesthetically offensive site open to public view? 0 0 (�. XIX.RECREATION.Will the proposal result in: a) Impact upon the quality or quantity of existing recreational opportunities? 0 0 (Pf XX.CULTURAL RESOURCES.Will the proposal: a) Result in the alteration of or the destruction of a prehistoric or historic archaeological site? 0 0 12( b) Result in adverse physical or aesthetic effects to a prehistoric or historic building,structure,or object? 0 0 c) Have the potential to cause a physical change which would affect unique ethnic cultural values? 0 0 [►1( d) Restrict existing religious or sacred uses within the potential impact area? 0 0 [� XXI.MANDATORY FINDINGS OF SIGNIFICANCE. a) Potential to degrade: Does the project have the potential to degrade the quality of the environment,substantially reduce the habitat of a fish or wildlife species,cause a fish or wildlife population to drop below self sustaining levels, threaten to eliminate a plant or animal community,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? 0 0 b) Short-term: Does the project have the potential to achieve short-term,to the disadvantage of long-term,environmental goals?(A short-term impact on the environment is one which occurs in a relatively,brief,definitive period of time. Long-term impacts will endure well into the future.) 0 0 Er c) Cumulative: Does the project have impacts which are individually limited, but cumulatively considerable? (A project may impact on two or more separate , resources where the impact on each resource is relatively small,but where the effect on the total of those impacts on the environment is significant.) 0 [Vf 0 d) Substantial adverse: Does the project have environmental effects which will cause substantial adverse effects on human beings,either directly or indirectly? 0 0 [� XXII.DISCUSSION OF ENVIRONMENTAL EVALUATION. (This section may be filled out by using narrative,or by using alarm,such as the example given in the CEQA Guide- lines.) XXIII.DISCUSSION OF LAND USE IMPACTS. (An examination of whether the project would be consistent with existing zoning,plans,and other applicable land use controls.) • Deer Creek Subdivision Initial Study/Mitigated Negative Declaration May 1,1995 Project Description Project Location The project site is located within the Town Limits of Los Altos Hills in Santa Clara County. The site is comprised of a trapezoid-shaped parcel consisting of 4.04 gross acres. The parcel fronts onto the east side of Purissima Road, east of Junipero Serra Freeway (280), and approximately 230 feet south of the intersection of Purissima Road and Elena Road. The project site is bounded to the west by Purissima Road and Town of Los Altos Hills property, to the south by a±3.3-acre parcel (developed with a single-family residence), to the east by Subdivision Tract No. 2895, and to the north by a ± 11.96-acre parcel developed with a single family residence. Access to the site is provided by an existing unnamed dirt/gravel road off of Purissima Road, across a bridge over Deer Creek, which also leads to the single-family residence to the south. The western third of the site consists of primarily level topography,with slopes ranging from 0-10% (elevations of 85-95 feet) and up to 10-20% in the most southwesterly corner. Deer Creek,which runs in a south-north direction,is also located in the western third of the project site. Deer Creek is an un-improved channel approximately 10-15 feet wide and 5 to 10 feet deep with near vertical banks. The banks are lined with stone blocks and the surrounding area is dense with vegetation. Numerous trees (mostly coast live oak and coast redwood) can be found along the banks of Deer Creek, extending the width of the property. The eastern two-thirds of the project site are characterized by two large knolls,rising in height to approximately 120 feet and 135 feet, respectively. Slopes on the knolls range from 20-30%. Several trees (mostly coast live oak and deodar cedar) are located on the large knoll located in the center of the project site. One large and three smaller plateau areas are also found scattered throughout this portion of the site. The large flat pad area is understood to have been the location of a now demolished house structure. An asphaltic concrete driveway exists along the southern side of the property, encroaching onto the adjacent southerly property, and leads up to the flat pad area. Project Characteristics The proposed project as defined by the proponent in the Tentative Map application filed on November 14, 1994 is to subdivide the 4.04-acre parcel into three smaller parcels ranging in size from 1.15 to 1.36 net acres for the purpose of constructing single-family residences. Also included in this application is the retrofitting of the existing bridge across Deer Creek stated previously or replacement with a new bridge, if found to be necessary, built to Town and Los Altos Fire Department standards. Refer to Figure 1, Site Plan. 1 Deer Creek S bdivision Initial Study/Mitigated Negative eclaration ay 1,1995 All three lots of the propose• subdivision would be served by a proposed public roadway (Samuel Lane) whic enters off of Purissima Road. Private driveway would extend off of Samuel Lane to t e 3 lots and the residence to the south. A conservation easement is •roposed, starting north of the bridge/road ay and extending to the northern pro ect boundary. It would encompass Deer Creek and the approximate limits of the 101-year flood plain. This easement would have width ranging from approximately 53-70 feet wide. A 10-foot trail easement is also p oposed for the northern project bound.ry. For the purpose of environm-ntal analysis, additional figures have been p ovided: Figure 2-Slope Classification ap and Figure 3 -Local Vicinity/Aerial Photo. The following table includes .n analysis of each lot and its corresponding of Unit Factor (LUF),Maximum Development Area (MDA) and Maximum Floor Area ( A) as required by Sections 10-1.502 and 10-1.503 of the Town of Los Altos Hills Zoning Ordinance. TABLE 1 Lot# Net Acre. Ave. Slope LUF MDAFA 1 1.23 16A% 1.061 13,369 6 026 2 1.27 17.2% 1.083 13,320 6108 3 1.15 11.7% 1.089 15,640 61441 Source: Jennings,McDe ott,Heiss,Inc. 2 Deer Creek Subdivision Initial Study/Mitigated Negative Declaration May 1,1995 Project Contact Persons Town of Los Altos Hills -Lead Agency Debbie Pollart,Interim Town Planner Suzanne Davis,Assistant Planner 26379 Fremont Road Los Altos Hills,California 94022 (415)941-7222 Project Proponent Lindy Properties I Agent: Mr. Shannon Paboojian 12280 Saratoga-Sunnyvale Rd.,#101 Saratoga,California 95070 (408) 255-4300 Proponent Consultant William Heiss,R.C.E. Jennings,McDermott,Heiss,Inc. San Jose,California (408) 286-4555 Proposed Finding The proposed project is not anticipated to have a significant effect on the environment after implementation of the mitigation measures proposed. Issues of the project were identified in an Initial Study completed and included in this document. • • 3 11133.5 £.o • 1 r . a ...., 19!21 33 'SS 137,1•1111*. 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P. l 7,• , . t ;'•'d• 'e,y •fir 1j,1L t f. ,, r • ; • • • • • .,•� ,, ''�.':>,-..740,•; -.4,...-....../.2,-.N. .� :.1••"•i.t'••' ;f 't' ,,• ;7TH r��• •�� ;ifr ;_ '•. :4. .r •1.„, J�'i`` • ..�, 'y�.•, ,I r r ;l7• .t- _, • •'', ..:k `• •• ''.!l 'r t tf '. • •, ''�",. 1,r • •'. f ,-....,A,. .: 1i•,� ..:r.411•44;"1,•.;4:.‘1• t ` ..• r i s - r • T •!t 1.4 A(, Aft j:/ ,,{t� .� ,•1'•t _,. �L _ ._�.'�::•..'�•. _ - .(' .''a.�' . �. .r• }. 1J�.'S+ •'••'J �� ~% •. �� 'TL'f`.7._j. •s.1 • Deer Creek Subdivision 14 Initial Study/Mitigated Negative Declaration May 1,1995 • Environmental Evaluation The following is an explanation of answers provided in the Initial Study. The roman numeral and letter reference correspond to those utilized in the Initial Study. Studies or reports utilized in analyzing this project include the following: • Noise Assessment Study,Illingworth&Rodkin,Inc.,May 28, 1992 • Survey of the Health and Structure of the Trees..., Barrie D. Coate, February 17, 1994 • Geotechnical Investigation,Terrasearch,Inc.,October 28, 1994 These reports are on file at Town Hall and may be viewed during normal business hours (8-12 and 1-5 Monday-Friday). Explanation of Responses I. Earth (a,b, c,e,f, g) The most prominent geotechnical feature of the site is the presence of highly and critically expansive near-surface soils. Such soils are prone to heave/shrink movements with changes in moisture content and must be carefully considered in the design of foundations and drainage. In addition, some non-engineered fill was encountered and observed on-site. Wet conditions were also encountered in the axis of the swale on Lot 1. Proposed cut and fill for the 3 lots is as follows: Lot 1 - 220 c.y. cut and 180 c.y. fill;Lot 2 -30 c.y. cut and 20 c.y. fill;Lot 3-no cut and 200 c.y. fill. Drainage and hydrologic information on the subdivision has not been submitted by the proponent, and as.a result evaluation of impacts related to changes in drainage patterns and quantities cannot be fully evaluated at this time. Erosion control measures- should be evaluated to determine which would be most effective in controlling erosion on this property, primarily during the construction phase of the subdivision improvements and also the individual site development. The rate of absorption of this property will be reduced due to the subdivision improvements and future site development. The effects of increased stormwater flow off the site will need to be investigated downstream of the project and appropriate mitigation measures incorporated into the downstream system to accommodate the increased rate of runoff. (d) No known unique geologic or physical features exist on-site which might be destroyed, covered,or modified due to grading/construction activities. 7 Deer Creek Sup ivision Initial Study/Mitigated Negative D laration .: M y 1,1995 Proposed Mitigation Meas res: 1. Non-engineered ill shall be removed, or if required to rema' in its current location, -hall be recompacted as engineered fill.The actu extent of removal shall •e determined in the field, by the Geotechnical Ertgineer during grading a d shall be accomplished to the satisfaction of the City Engineer prior to ssuance of building permits. 2. A subdrain shall •e constructed in the axis of the swale on Lot 1,the extent of which shall be •etermined by the project Geotechnical Engine in the field during gr.ding. The subdrain, or approved equal, s rall be constructed as shown in the Terrasearch Geotechnical Investigatio>'report dated October 28, 1994 (Figure 2,Appendix A) and shall be accomplished to the satisfactio of the City Engineer prior to issuance of building permits. 3. Proposed reside ces shall be founded on a pier and grade beam four dation. The b idge structure and site retaining walls shall be funded on either a pier or a spread footing foundation system. Recomme (dations for both foundati on systems are given in the Terrasearch Geot chnical Investigation report dated October 28, 1994. Upon constructio of the foundations for :ach lot, the bridge improvements and site r taining walls, conforman e with the recommended foundation systemshall be verified to the satisfaction of the Town geologist and City Engineer prior to subsequent ins}ection approvals. 4. The surface of th: areas to be cut and filled at the site shall be stripped cleared and gru•bed to remove all existing vegetation and/or other deleterious mater'als. The actual depth of stripping is unknown and shall be determined in he field by the project Geotechnical Engineer. Stripped material from th: site shall not be used as engineered fill but may be stockpiled and u-ed later for landscaping purposes. Plans show'ng the exact areas to be tripped and depth of stripping shall be submi ted for approval to the Ci y Engineer prior to issuance of grading permits. 5. Following site cle.ring, the area of non-engineered fill shall be removed to expose native gro nd.-Keyways shall then be provided at the bas of any proposed fill slop- and shall be'a minimum 1-1/2 times machine width, cut into firm natio- ground and sloped back into the hillside at a gradient of 5%0. The fill are shall then be constructed by placing engineere fill as specified in mitig:tion measures 6, 7, 8, and 9. Benching into th native hillside shall be erformed as the filling Progresses. At this ti e, the construction of a subsurface drain at the back base of the ke is not anticipated; howe er, the final determination shall be made in the ield by the project Geot-chnical Engineer. This shall be accomplished to the 8 Deer Creek Subdivision • Initial Study/Mitigated Negative Declaration May 1,1995 satisfaction of the City Engineer during grading operations and prior to issuance of building permits. 6. All materials encountered on-site, except for debris and organically contaminated material, are suitable for use as engineered fill. Any large cobbles or boulders that are encountered shall be broken down to less than 6 inches in size for use in the fill. If the existing southern driveway is to be removed, the asphaltic concrete and aggregate base materials in the existing driveway pavement may be used for fill provided the asphalt is pulverized and the materials are properly mixed with the on-site fill. The use of these materials in the upper 1 foot in landscape areas shall be prohibited. This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading operations and prior to issuance of building permits. 7. All engineered fill shall be placed in thin lifts not exceeding 8 inches in uncompacted thickness and compacted to a minimum of 90% relative compaction at 2% to 3% above optimum moisture. Relative compaction is based on the maximum dry density as determined by ASTM D1557-78 Laboratory Test Procedure. This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading operations and prior to issuance of building permits. 8. All unsupported cut and fill slopes shall not be steeper than 2:1 (horizontal to vertical). Any cut excavation over 5 feet shall be observed by the project Geotechnical Engineer to detect the presence, or otherwise, of any adverse conditions that may affect stability or retaining wall design. This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading operations and prior to issuance of building permits. 9. All fill slopes shall be over-constructed and then cut back to the design slope grade ensuring that all loose material is removed. (Track-walking of slope surfaces does not provide adequate soil densities and shall not be utilized as a method of slope compaction.) This shall be accomplished to the satisfaction of the project Geotechnical Engineer and City Engineer during the grading operations and prior to issuance of building permits. 10. A project grading plan which includes an approved drainage and erosion control plan to minimize the impacts from erosion and sedimentation shall be submitted to and approved by the City Engineer prior to issuance of grading permits. This plan shall conform to all standards adopted by the Town of Los Altos Hills and shall comply with all appropriate requirements of the Town's NPDES permit relative to grading and erosion/sediment control including, but not limited to: a) restricting 9 Deer Creek S bdivision '' Initial Study/Mitigated Negative D claration M y 1,1995 grading during t e grading moratorium from November 1 to A ril 1; b) protecting all fini.hed graded slopes from erosion using such to 'ques as hillslope benc • g, erosion control matting, hydroseeding;c)pr tecting downstream sto m drainage inlets from sedimentation; d) u of silt fencing to retai sediment on the projeict site; e) any other uitable measures outline• in the Association of Bay Area Governments (ABAG) Manual of Stands' ds. 11. Construction of .roposed pier foundations, spread footings, slabs-on- grade, retaining walls, driveways, and utility trenches shallccur as recommended in the Terrasearch Geotechrucal Investigation repo dated October 28, 199 or as indicated by the, City Engineer. This hall be accomplished to , e satisfaction of the Town Geologist and City ngineer prior to further i -pection approvals. 12. Due to the prese ce of soils identified as highly and critically expansive, detailed lot-spec fic construction plans shall be reviewed by t 1e Town Geologist prior •o issuance of site development permits and uilding permits, respecti ely. 13. The project geote 'cal consultant shall review all geotechnical a pects of site mprovemen is illustrated on the current Tentative Map. App opriate evaluations and/4 r subsurface investigationishall be completed to address the feasibility of the proposed house site on Lot 3. The potential eed for removal/recom•action of existing fill materials in this area hall be assessed. The c 0 nsultant shall comment on the acceptabilit of all proposed septic leachfield sites from a geotechnical perspective. The results of these e aluations shall be summarized by the consultant in a letter and submi ed to the Town for review by the Town Geologist prior to approval of th- Tentative Map. II. Air (a,b, c) Due to the small amoun of development proposed, this project is not anticipated to result in a significant long-term modification to air quality. Short-term construction-related air quality impacts are anticipated, but are not exp cted to be significant based upo the size of the proposed development. III. Water (b,e The absorption rates at.- anticipated to decrease resulting in an increa e in the rate and amount of sur pace runoff due to the proposed project. The absorption rates may be mitigated .uring the landscaping review anticipated to be equired with the individual site evelopment permits. Declining absorption rate and an 1 1 • 10 1 I I ' Deer Creek Subdivision Initial Study/Mitigated Negative Declaration May 1,1995 increase in surface runoff may be mitigated by requiring additional plantings at that time. While the improvement of the proposed project site in anticipated to result in discharges into surface waters, the surface water quality is not anticipated to be altered to any significance. The conservation easement that is proposed for the Deer Creek corridor is intended to provide the natural landscape buffer between the proposed development and the creek that is recommended by SCVWD for. water quality preservation. (a, c, d,f,g,h,i) No changes in currents, or the course or direction of water movements in either marine or fresh waters will occur as a result of the proposed project. There are not any alterations to the course or flow of flood waters or changes in the amount of surface water in any bodies of water anticipated to result from the proposed project. No groundwaters are anticipated to be affected by development of the proposed project, either through alteration of flow or a change in the quantity. Purissima Hills Water District will be servicing this development and indicates service may begin upon application, payment of fees, and installation of necessary facilities by the proponent. Although a 100-year flood plain does occur on-site within Lot 3 (encompasses Deer Creek), the proposed building footprint is located outside of the 100-year flood plain. Therefore, no impacts related to flood hazards are anticipated. Proposed Mitigation Measures: 14. The applicant shall be required to apply for and receive a Creek Alteration Permit from the California State Department of Fish and Game prior to issuance of grading permits. This shall be accomplished to the satisfaction of the City Engineer. 15. The site drainage associated with the proposed development must be designed as surface flow whenever possible to avoidconcentration of the runoff. The proposed drainage shall be designed to maintain the existing flow patterns and shall be designed to the satisfaction of the City Engineer prior to issuance of grading permits. Final storm drainage improvements shall be inspected by the City Engineer and any and all deficiencies corrected to his satisfaction prior to acceptance of subdivision improvements. • 11 Deer Creek Subdivision ' Initial Study/Mitigated Negative D� laration .. M y 1,1995 IV. Plant Life (a,b, c,d) . A tree survey report pre•ared by arborist Barrie D. Coate catalogued a t tal of 72 trees on-site. Of this tot.1, eight trees are proposed by the arborists for emoval due to death, poor hea th/structure, or damage/infringement on an tdjacent tree. Seven additional t ees are proposed by the proponent to be rem ved as necessary for construction of on-site roadways. This includes two coast live oak trees. Due to the numbe of trees remaining on-site,removal of the recommended trees is not anticipated to result in a significant impact. It is anticipa ed that landscaping will be r=quired on the individual lots when they a ply for development through he Town. This however', would not be coni erect a significant introductio of new species nor create a barrier to the normal replenishment of existi g species. No known rare or endangered species are thought to exist on-site. D evelopment of the site would not result in a r duction of agricultural crops as one exist on-site. V. Animal Life (a,b,c,d) Due to they size of deve opment proposed, it is not anticipated to significantly impact existing species. No significant wildlife habitat areas or rare or endangered species ar: known to exist on-site. The Conservation Easement proposed for the Deer C eek corridor will prevent urban uses and development- related activities from e croaching upon this area It is anticipated that omestic animals may be intro uced into the area upon development, but not in significant numbers. VI. Noise (a,b) A Noise Assessment wa• prepared by Illingworth&Rodkin, Inc. in May of 1992. That report concluded a- follows: "The existing noise level. range from a 24-hour average day/night level (Ldn)of 52 to 60 dBA. Noise leve s are not anticipated to increase in the future al ng this stretch of I-280. While the Town of Los Altos Hills does not have specific guidelines elated to out oor noise exposure, their standards indicate that an Ldn of 60 dBA or less is co patible with residential development. This is ty ical of most municipalities in Northern California. The site's noise expo ure is, therefore, acceptable for residential development without additional mi 'gation. The Town does require hat interior noise levels not exceed an Ldn of 45 dBA. Typical California resid ntial construction provides 15 dBA of noise red uction with open windows wh:n going from outside to inside, and 20-25 dBA f noise reduction with the wi dows closed. Interior noise levels would also be in compliance without add•tional mitigation." 12 Deer Creek Subdivision Initial Study/Mitigated Negative Declaration May 1,1995 There will be no significant noise impacts to existing residents as a result of people-generated noise on the site. Off-site traffic noise increases would be negligible,as well. There would be short-term increases in the noise environment in the area during construction. Compliance with the Town policies and limiting construction to weekday, daytime hours, would mitigate construction noise impacts to a less than significant level. VII. Light and Glare (a) No significant levels of light or glare in excess of those provided for in the Town Zoning Ordinance are anticipated to result from development of this property. VIII. Land Use (a) The proposed project is consistent with Town policiesin that single-family residences are an allowed use within,the RA-1 zone and that the LUF, MFA, and MDA for all three lots meet minimum Town requirements. This project would be in conformance with the adopted General Plan. IX. Natural Resources (a) Due to the size of the proposal, residential development of this property is not anticipated to significantly impact the rate of use or availability of any natural resources. X. Risk of Upset (a,b) Residential development of this property will not result in significantly increased risks associated with hazardous materials or interference with any emergency plans. XI. Population (a) No significant alterations of population trends are associated with this project. XII. Housing (a) This project will add 3 new residential units to the Town's existing housing stock but is not anticipated to result in a significant impact on the availability of or need for housing. XIII. Transportation/Circulation (a-f) Significant volume increases are not anticipated as a result of development of this site. The proposed entrance to the subdivision is located along a straight portion 13 I Deer Creek Subdivision 'J Initial Study/Mitigated Negative D laration •- Ma, 1, 1995 of Purissima Road,offeri g adequate visibility for ingress/egress. No increase in traffic hazards are antici ated. XIV. Public Services (a-f) Development of three re idential lots is not anticipated to significantly affect the provision of public servi es by the Town or applicable service agencies. XV. Energy (a,ti) 1 Development of three re idential lots is not anticipated to significantly impact energy resources or their availability. XVI. Utilities and Service Sys ems (a,b, c,e,f) 1 Utility companies have i dicated no problems with the provision of se ices to the proposed project. 1 (d) Sanitary sewer service i currently not available to this area which re ults in septic tanks,and leachfie ds being the only available sanitary sewerage d isposal. The acceptability of all proposed septic leachfield sites from a geotechnical perspective!shall be prov ded as specified in mitigation measure 13. Proposed Mitigation Measures: I 16. The acceptability •f all proposed leachfield sites and capacities s all be provided by the Santa Clara County Environmental Health S rvices Department to the satisfaction of the City Engineer prior to Tentative Map approval. XVII. Human Health (a,b) No health hazards hav:• been identified nor are anticipated relative to the proposed project. XVIII. Aesthetics a,b) No obstruction of any s.enic vista or creation of an aesthetically offensive site open to the public view i- anticipated due to the proposed project. •1 1 1 1 14 ' Deer Creek Subdivision Initial Study/Mitigated Negative Declaration May 1,1995 XIX. Recreation (a) No affect on the availability or quality of recreational resources is anticipated to occur due to the proposed project. XX. Cultural Resources (a-d) No culturally or historically significant resources are known to exist or have been identified in association with this project site. 15 TO N OF LOS ALTOS Lit LL.5 2079 Freemont Road • Los Altos lilts,California 94U22 • (415)941.7222 • FAX (415) 941-3160 1 LANNING DEPARTMENT WORKSHEET #1 ®Q ES8i CALCULATION • AVERAGE SLOPE, LOT UNIT FA P•,. : E, �°ti MAXIMUM DEVELOP ENT AREA, AND MAXIMUM FL• 'P , : 'i A `10 'gym • TUR IN WITH YOUR APPLICATION • NP. 12781 ► _,a .. PROPERTY OWNER'S NAME L,S ,; �- � * ��� .' / , , PROPERTY ADDRESS 1 5air F� �‘ )11/1 (?' P CALCULATED BY E n 1 d rij� l DATE L1 --......00.---- 1. CALCULATION OF AVERAGE S i OPE - TOTAL . A. CONTOUR LENGTH WI a' NET AREA OF LOT (An) CONTOUR LENGTH CONTOUR LENGTHCONTOUR (INGTH CHES)S) CONTOUR (INCHES)GTH (INCHES) (INCHES) .5 . '-/1".0 125 1.2se' al40 11 .0 I 1-(rP q 615" )le 4-1' 1, moi, )3.5 moi ) 145 1' 4' , 1 ) 15 I,Ve q f 1 ?.z0 11/7 TOT4L 1:2-q, 1 ! Convert inches to feet (multiply b map scale) _ (L) = __ L feet B. AVERAGE SLOPE WITHIN T AREA OF LOT (L) I = co tour interval h L= total length of An = net acreage, S = (0.0023) (I) ( A n in eet contours in feet of lot S = (0.0023) ( 5 ) ( .5;)m) = 1 5i 12 nearest 0.1% 2. CALCULATION OF LOT UNIT CTOR (LUF) LUF = (An)(1 - [0.02143(S- 10)]) ________L.142 1 I.> If the averagp sloe is less th n 10%, the LUF for the lot is equal to the net, rea. . , It> If the LUF is eq ual to or less t an 0.50, you will need a Conditional Development Permit. Make an appointment with he Town Planner for further information. • --- --- 4 _r^ - I TOWN 01: LOS ALTOS titLI..;; 26379 Fremont Road • Loos Altos 11111s,California 94022 • (415)941.7222 • l'AX (415) 941-3160 PLANNING DEPARTMENT WORKSHEET #1 CALCULATION OF AVERAGE SLOPE, LOT UNIT FACTOR MAXIMUM DEVELOPMENT AREA, AND MAXIMUM FLOOR AREA • TURN IN WITH YOUR APPLICATION • PROPERTY OWNER'S NAME v i - r- / e I '• '' - �-1.1'1 sO _�, PROPERTY ADDRESS S• • 's , V DATE t, v� �J' 1 CALCULATED BY i ID 4 1. CALCULATION OF AVERAGE SLOPS Pi Le T I h10. 127131 7 WITHIN NET AREA OF LOT (An) ''�� ,,`i f-� LENGTH /,/ A. CONTOUR �` _ _ CONTOUR LENGTH CONTOUR LENGTHCONTOUR LE(INCHES) GTH 105 • ` + (INCHES) (INCHES) 10 3 0 MOM= : ) ) 5" 5-, WM MEW ) , MIMI 3D &, 2 MOM 0 ,7; i MEM TOTAL 4 3- .0 Convert inches to feet (multiply by map scale) _ (L) _ ) -7 5 2 feet B. AVERAGE SLOPE WITHIN NET AREA OF LOT L I = contour interval ' L= total length.of An = net acreage S = (0.0023) (I) ( ) ( of lot An in feet contours in.feet S = (0.0023) ( 5 ) ( ) 75 • 1 : j nearest 0.1% 2. CALCULATION OF LOT UNIT FACTOR(LUF) LUF = (An)(1 - [0.02143(5- 10)]) = 1' ki1 1 C> If the average slope is less.than 10%, the LUF for the lot is equal to the net area. I It> Ifthe LUF is equal to or less than 0.50, you will need a Conditional Development Permit. Make an appointment with the Town Planner for further information. Pale 1 of 2 - --- ._.....l•I I A J9Jc/Wesbite t III WORKSHEET 61 CONTINUED 3. CALCULATION OF MAXIMUM DEVELOI'MENTAREA (MDA) A. for S equal to or less than 10% MDA = (LUF) (15,000) _ square feet* • B. for S greater than 10% and less than 30% square feet' MDA = (LUF) [15,000 -375(S- 10)] = 3 �j(o I C. for S equal to o greater than 30% square feet* MDA = (LUF) (7,500) = * If the MDA is less than 5,000 square feet (and the LUF is greater than 0.50), use 5.000 square feet for your MDA 4. CALCULATION OF MAXIMUM FLOOR AREA (MFA) A. for S equal to or less than 10% square feet** MFA = (LUF) (6,000) _ B. for S greater than 10% and Less than 30% square feet** MFA = (LUF) [6,000 -50(S- 10)] = Cv 0 C. for S equal to greater than 30% square feet** MFA = (LUF) (5,000) = ** If the MFA is less than 4,000 square feet (and the LUF is greater than 0.50) use 4,000 square) feet for your MFA • DATE I TOWN USE ONLY CHECKED BY • Paee 2 of 2 - - - - toru►NNINC/W«kahed iI TOWN OF LOS ALTOS I I!LL.5 26379 Fremont Road • Los Altos ) !illNC California 9 022 • (415)941.7222 • 1'AX (415) 941-;1160 PLA WORKSHEET #1 CALCULATION OF AVERAGE SLOPE, LOT UNIT FACTOR MAXIMUM DEVELOPMENT AREA, AND MAXIMUM FLOOR AREA • TURN IN WITH YOUR APPLICATION • Qui[ 0044 PROPERTY OWNER'S NAME � ' '- � / �/ �• S^ PROPERTY ADDRESS '2;7 - DATE lr -119' ' CALCULATED BY1 )) q,p() 1 a PIU. .41 t0 i 1. t.0 1i ATLON OF AVER Ac:F SLOPE /1#1, ' CIvA. CONTOUR LENGTH WITHIN NET AREA OF LOT (An) • /`q � �- -4LENGTH CONTOUR LENGTH CO� 'r� --� GTH CONTOUR LENGTH CONTOUR (INCHES) (INCHES) (INCHES) (INCHES) 1 ►vv 3•.1- 1111111111111 Vir2. 'VT 10111111011111111111 • _A2_.%' 5� i 1 � 5 TOTAL ) 7-8 feet Convert inches to feet (multiply by map scale) = (L) = _ B. AVERAGE SLOPE WITHIN NET AREA OF LOT L I = contour interval L= total length of An = net acreage S = (0.0023) (I) O of lot An in feet contours in feet S = (0 0023) ( _ 1 ---7,' d i nearest 0.1% 2. : 4 1. 0 . • • ► : « • c V . LUF = (An)(1 - [0.02143(S- 10)]) = c If the average slope is less than 10%, the LUF for the lot is equal to the net area. * If the Ltt equal is a ual to or less than 0.50, you will need a Conditional Development Permit. Make an appointment with:the Town Planner for further information. Page 1 of 2 - Lin 01 C'esk , . WORKSHEET Ill CONTINUED • ' • • ►i a ►/ 14 • F • 14 ►II t 4 1 0 : A. for S equal to or less than 10% MDA = (LUF) (15,000) = quare feet" B. for S greater than 10% and less than 30% MDA = (LUF) [15,000-375(S:.10)] = 3 gzo square feet" C. for S equal to or greater than 30% square feet' MDA = (LUF) (7,500) = * If the MDA is less than 5,000 square feet (and the LUF is greater than 0.50), use 5.000 square feet for your MDA CALCULATION OF MAXIMUM FLOOR AREA (MFA) A. for S equal to or less than 10% square feet** MFA = (LUF) (6,000) = B. for S greater than 10% and less than 30% square feet,* MFA = (LUF) [6,000-50(S-10)] = '/ ) °13'. C for S equal to or greater than 30% � square feet* MFA = (LUF) (5,000) _ * the MFA is less than 4,000 square feet (and the LUF is greater than 0.50) If use 4,000 square feet for your MFA TOWN USE ONLY CHECKED BY DATE Page 2 of 2 ,;, ..Ar unioRICINAII/M.ANNINC/Wart st�I Yi,' . .1 w • • TOWN OF LOS ALTOS t•1►21.5 26379 Fremont Ita,kl • Los Altos I'ANCINCa•(' irn A1122 • NT )941.72'22 • FAX (415) 941.3160 I WORKSHEET #1 CALCULATION OF AVERAGE SLOPE, LOT OAX1I�iUM FACTOR MAXIMUM DEVELOPMENT AREA, AN • TURN IN WITH YOUR APPLICATION • PROPERTY OWNER'S NAME 1_,) 10t30 Tc('t f?° q---)-ie . 1 ,Qw,ftc�e�,� ADDRESS ~T w(' C )Y'Q g %lad �i !'. . . PROPERTY � �I � �1 � � DA ,�W - •i� . ,. CALCULATED BY A e `� 1 - L v T3 NO. ire 1. 4 :/i- THIN NET AREA OF LOT (An) , A. COIVTOU1v3 LTsNGTI-I WI '• CONTOUR LENGTH CONTOUR CONTOUR (1�I�➢CHES) • (INCHES) (INCHES) (INCHES) 'ice . 0 r ' , rj' Cie . . 11111.11111 .17C 3 05 47. 3 TOTAL '2,19.7 Convert inches to feet (multiply by map scale) = (L) = _ i'8 feet B. AVERAGE SLOPE WITHIN NET AREA OF LOT h of An = net acreage S = (0.0023) (I) (L) I = contour interval L= total contouers�in feet of lot An in feet S = (0.0023) 8 ) _ 14 , 60 nearest 0.1% ( ti4 ; ) 2. : : 11 . 1. e • ► : M • v LUF _ (An)(1 - (0.02143(S - 10))) _ If the average slope is less than 10%, the LUF for the lot is equal to the net area. * If the LUF is equal ne Permit,to or less than 0.50, you will need a Conditional Development Make an appointment with/the Town Planner for further information. Page 1 of 2 L.UI t MAC UD/OIIICINALS/PLANNING/Warialws•' • WORKSHEET til CONTINUED 3. 1 • • • I I/ I/ 9 • 7 0 I/ • %Al 9 4, A. for S equal to or less than 10'0 MDA = (LUF) (15,000) = square feet" B. for S greater than 10% and less than 30% MDA= (LUF) [15,000-375(S- 10)] = 0 square feet* •• C. for S equal to or greater than 30% MDA = (LUF) (7,500) = square feet* * If the MDA is less than 5,000 square feet (and the LUF is greater than 0.50), use 5,000 square feet for your MDA 1. est 1/ A. for S equal to or less than 10% MFA = (LUF) (6,000) = square feet" B. for S greater than 10% and 1 ss than 30% MFA = (LUF) [6,000 -50(S-1 )] square feet" • C. for S equal to or greater tha 30% MFA = (LUF) ( ,ow) = square feet" • * If the MFA is less than 4,000 quare feet (and the LUF is greater than 0.50) use 4,000 square feet for yo MFA'. TOWN USE ONLY CHECKED BY DATE Page 2 of 2 I ni MAC HD/osIGINAL15/111.ANNING/Woilubset el di,��llpVaaaai` CtytiaULTA81T8 William Y`� illiam Cotton 330 Village Lane Los Gatos, California 85030 and Associates (408) 354-5542 May 5, 1995 L3254B TO: Sheryl Kolf Assistant Engineer TOWN OF LOS ALTOS HILLS 26379 Fremont Road Los Altos Hills, California 94022 SUBJECT: Supplemental Geotechnical Review RE: Lindy/Deer Creek Subdivision 27591 Purissima Road File #199-94-TM-IS-ND-GD At your request, we have completed a supplemental.geotechnical review of the Tentative Map application using: • Supplemental Geotechnical Investigation (letter) prepared by Terrasearch, dated April 28, 1995; and • Tentative Map, Creek Cross Sections and Slope Classification Map (4 sheets, various scales) prepared by Jennings-McDermott-Heiss, revised February 28, 1995. In addition, we have reviewed pertinent technical documents from our office files. DISCUSSION Our review of the referenced Tentative Map indicates that the applicant proposes to subdivide the subject property (approximately 3.9 acres) into 3 lots for single-family residential development. An existing bridge over Deer Creek would be replaced as part of the subdivision-level improvements. Septic leachfield systems are proposed to serve the new residences. In our previous review report (dated March 21, 1995), we recommended that supplemental geotechnical evaluations be satisfactorily completed prior to approval of the Tentative Map. We currently understand that the project engineer has conducted supplemental evaluations to define the limits of the 100-year flood and that flooding issues are to be addressed to the satisfaction of the Town Engineer. We have not received supplemental documentation addressing septic leachfield design.However,we do understand that supplemental percolation testing has been completed on Lot 3 to • address,our previously stated concerns about adequate septic system performance under wet weather conditions. ENGINEERING GEOLOGY • ENVIRONMENTAL EARTH SCIENCES • FOUNDATION ENGINEERING Sheryl Kolf May 5 995 Page 2. L3 54B • • • _ +1• • •MjENDED ACTION The project geotechni•al consultant has adequately addressed the geotech ical issues of our previous revi-w report. The consultant has .completed additi nal subsurface investigation to •onfirm anticipated soil conditions within the buil ing envelope on lot 3 and has re 'ewed and approved the feasibility of improvements as indicated on the Tentative ap. Consequently, we recommend approval of the Tentative Map with the follow g conditions: 1. Subdivision_L vel Improvemgpts - AU geotechnical aspects of detailed constr ction plans for the proposed bridge and other subdivision ley.' improvements should be reviewed and approved bey the project geotechnical consultant for conformance with • previously rec•, . - ded geotechnical design criteria. The results of ese evaluations should be summarized by the consultant in a 1-tter and submitted to the Town,for review by the Town Engineer prior to issuance of permits for construction of subdivision ley- improvements. 2: Construction i•lan Review - Due to the presence of soils identified as h ghly and critically expansive by the project geotechnical co sultant, detailed lot specific construction plans should be revie ed by the Town Geotechnical Consultant prior to approval of buil:ing permits for residential construction. Respectfully submitted, WILLIAM COTTON AND ASSOCIATES,INC. TOWN GEOTECHNICAL CONSULTANT Ted Sayre Senior Engineering Geologist / a l U+ � William R.Cotton Principal Engineering Geologist CEG 882 WRC:TS:rb • William Cotton and,Associates William Cotton 330 Village Lane Los Gatos, California 95030 ,., 4 and Associates (408) 354-5542 March 21, 1995 L3254A RECEIVED • MAR 2 2 1995 TO: Sheryl Kolf TO\4N OF LOS ALTOS HILLS Assistant Engineer TOWN OF LOS ALTOS HILLS 26379 Fremont Road Los Altos Hills, California 94022 SUBJECT: Supplemental Geotechnical Review RE: Deer Creek Subdivision 27591 Purissima Road File #199-94-TM-IS-ND-GD At your request, we have completed a supplemental geotechnical review of the Tentative Map application using: • Geotechnical Investigation (report) prepared by Terrasearch, dated October 28, 1994; and • Tentative Map, Creek Cross Sections and Slope Classification Map (4 sheets, various scales) prepared by Jennings- McDermott-Heiss, revised February 28, 1995. In addition,we have reviewed pertinent technical documents from our office files and completed a recent site reconnaissance. DISCUSSION • Our review of the referenced Tentative Map indicates that the applicant proposes to subdivide the subject property (approximately 3.7 acres) into,3 lots for single-family residential development. An existing bridge over Deer Creek would be replaced as part of the subdivision-level improvements. Septic leachfield systems are proposed to serve the new residences. In our previous review report (dated December 6, 1994), we recommended that flooding issues, septic leachfield design issues, and geotechnical concerns be satisfactorily addressed prior to approval of the Tentative Map. We currently understand that the project engineer has conducted supplemental evaluations to define ENGINEERING GEOLOGY • ENVIRONMENTAL EARTH SCIENCES • FOUNDATION ENGINEERING Sheryl Kolf V March 21, 1995 ,� Page 2 L3254A I , the limits of the 100-year floo and that flooding issues are to be addressed to the satisfaction of the Town Engin er. We have not received supplemental documentation addressing septic leachfield or eotechnical issues. Since our last review, the propolsed house site on Lot 3 has been r located to the west side of the creek and all proposed septic leachfield areas for this 1 t are situated on the east side of the creek. I CONCLUSIONS AND RECO MENDED ACTION I Our primary concern wi the revised development plan is the uncertain viability of the proposed septic leachfield area on Lot 3 as currently proposed. In addition, the project geotechnical consultant should evaluate all geotechnical aspects of the current development plan (including eptic leachfield placement and the modified building envelope on Lot 3). The proposed septic lea field on Lot 3 is located atl the mouth of a broad swale that appears to direct surface ow into the leachfield area. Seepage and saturated ground conditioris were previo ,sly observed in the upper reaches of this swale within Lot 1. The combination of loca ly deep clay-rich soils, and lateral flow of surfaceand subsurface water into the leach ield area may result in seasonally reduced percolation capacity. In addition, the proje.t geotechnical consultant has identified the presence of 4 feet of clay fill rear the center •f the proposed leachfield. The County Environmental Health Officer should be awar of these existing conditions and concerns during is evaluation of the revised septic 1,achfield design. I The previous geotechnic.l investigation prepared by,Terrasearch did not include subsurface investigation of the currently proposed building envelope on Lot 3. It appears that existing fill material s are present in the vicinity of the proposed house site. The project geotechnical consultant should complete additional evaluations and/or investigation to address the fea•ibility of the proposed Lot 3 house site. The potential need for removal,recompaction of existing fill materials in this area should be assessed. All geotechnical aspects of the proposed Tentative Map should be reviewed by the project geotechniclal consultant. We recommend that the iollowing evaluations be satisfactorily completed by the project geotechnical consultant .rior to approval of the Tentative Map: 1. Su. .lemeIntal Geotech ical Evaluations and Plan Review - The project geotechnical consultant should review of all geotechnical aspects of site improvements illustrat:d on the current Tentative Map. Appropriate evaluation's and/or subsurface investigation should be completed to address the feasibility of the pro•osed house site on Lot 3. The potential need for removal/recompaction f existing fill materials in this area should be assessed. 1 The consult nt should comment on the acceptability of all proposed eptic leachfiel. sites from a geotechnical perspective. The results; of these evalu-tions should be summarized by the consultant in a letter and Isubmitted to the Town for review by the Town Geotechnical Consultant prior to appr•val of the Tentative Map. • William Cotton and Associates Sheryl Kolf March 21, 1995 Page 3 L3254A 2. Construction Plan Review - Due to the presence of soils identified as highly and critically expansive by the project geotechnical consultant, detailed lot specific construction plans should be reviewed by the Town Geotechnical Consultant prior to approval of building permits for residential construction. Respectfully submitted, WILLIAM COTTON AND ASSOCIATES, INC. TOWN GEOTECHNICAL CONSULTANT C:y Ted Sayre 2illia r Engineering Geologist io Yt, m R. Cotton Principal Engineering Geologist CEG 882 WRC:TS:rb William Cotton and Associates Via.a 1�11� 1 Co on 330 Village Lane -�'" }? v q Los Gatos, California 95030 and Associates (408) 354-5542 December 6, 1994 L3254 • TO: Sheryl Kolf Assistant Engine•r TOWN OF LOS LTOS HILLS 26379 Fremont ,oad Los Altos Hills, California 94022 SUBJECT: Preliminary Ge•technical Review RE: Deer Creak Subdivision 27591 Pu 'ssima Road File #199 94-TM-IS-ND-GD At your request, we ha e completed a preliminary geotechnical review of the Tentative Map application usin„: • Geotechnical Inve tigation (report) prepared by Terrasearch, dated October 28, 1994; .nd • Tentative Map, :ridge Details, Roadway Profiles and Slope Classification Map (3 sheets, various scales) prepared by Jennings- McDermott-Heiss, dated September 1994. In addition, we have rev ewed pertinent technical documents from our office iles and completed a 'recent site rec nnaissance. DISCUSSION Our review of the referenced Tentative Map indicates that the applic nt proposes to subdivide the sub ect property (approximately 3.7 acres) into 3 lots for single-family residential devel.pment. It appears that previous residential structures have been removed from the e.stern portion of the property. Access to the proposed lots would be provided by a ne cul-de-sac (Samuel Court) off of Purissima Road, With three driveways''extending to proposedhouse sites. Ar existing bridge along ithe proposed cul-de'sac alignmen would be replaced as part of the subdivision-1 vel improvements. Septic leachfiel. systems are proposed to serve the new residences. SITE CONDITIONS The western portion o the subject property is generally characterized by relatively gentle (2 - 6° inclinati•n) valley floor topography adjacent to Deer Creek. The eastern portion of the property s generally characterized by moderately steep (10 - 3° inclination) west-facing hillside tepography. In addition, previous grading in the eastern portion of the property has res tiled in relatively level, combination cut and fill pals. Relatively minor fill prisms, o' approximately 2 to 5 feet in depth, are also present adjacent to Deer Creek in the v'cinity of the proposed house site and septic leachfield site for Lot 3. Drainage is cha acterized by sheet flow toward Deer Creek. A broad swale in the northern portion.of Lot 1 directs surface flow toward the house site on Lot . ENGINEERING GEOLOGY • ENVIRONMENTAL EARTH SCIENCES • FOUNDATION ENGINEERING 14,0 k4g0' Sheryl Kolf December 6, 1994 Page 2 L3254 3. Seepage and saturated ground conditions were observed in the upper reaches of this swale within Lot 1. The property is underlain, at depth, by poorly indurated sandstone, siltstone, mudstone and conglomerate of the Santa Clara Formation. The bedrock is overlain by potentially expansive colluvium on the western slopes, and potentially expansive alluvium adjacent to Deer Creek. The gentle slopes adjacent to the creek, including the proposed Lot 3 house site, appear to be located in a flood plain. During our site reconnaissance, a neighbor reported to us that the vicinity of the proposed Lot 3 house site was flooded when Deer Creek jumped its banks in the mid- 1960's. It is possible that high flows along Deer Creek may be constricted by an existing culvert along the channel northwest of the subject property. CONCLUSIONS AND RECOMMENDED ACTION Proposed site development is constrained by.potential flooding, potential seasonal shallow groundwater conditions and expansive soils. Potential flood conditions may impact the design of the replacement bridge, as well as the building site feasibility on Lot 3. Seasonal shallow groundwater conditions may adversely affect septic leachfield percolation on Lot 3. The referenced geotechnical investigation(report) recommends specific design measures to mitigate expansive soil conditions. In our opinion, consideration of supplemental groundwater level monitoring and/or additional wet weather percolation testing is warranted for the proposed Lot 3 septic leachfield system. In addition, we are generally concerned about the potential consequences of installing leachfield lines immediately upslope of a residence, such as indicated by the 50'percent secondary leachfield area located east of the house site on Lot 3. The County Environmental Health Officer should address whether additional winter testing is appropriate to verify adequate septic percolation performance. The potential for flooding and the limits of the local flood zone should be fully evaluated and supporting documentation should be submitted which clearly demonstrates the extent of the hazard. Possible channel constrictions located to the north and northwest of property should be considered in this evaluation. It appears that site development plans have changed somewhat since preparation of the referenced geotechnical report. The project geotechnical consultant should review all geotechnical aspects of the proposed Tentative Map and submit a plan review letter. We recommend that the following issues be satisfactorily addressed prior to approval of the Tentative Map: 1. Flood Hazards - The project engineer should fully evaluate local flood hazards and establish the limits of the local flood zone. In terms of building site feasibility, the 100-year flood should be analyzed. The potential onsite impacts of possible channel constructions, located to the north and northwest of the property,should be considered in this evaluation. The results of this study, along with supporting calculations, should be submitted to the Town for review by the Town Engineer prior to approval of the Tentative Map. William Cotton and Associates • Sheryl Kolf December 6, 1994 Page 3 L3254 2. • . : • , fa •. - The potential need for additional wet weather percolation testing and or groundwater level monitoring at this site should lie considered by the Co my Environmental Health Officer. Based on our reconnaissance mappi g, portions of all three proposed leachfield areas oh Lot 3 appear to be and-rlain by artificial fill. 3. • •'t ' t • '• . - The project geotechnical consultant should review the geotechnica feasibility of all site improvements illustrated on the current Tentative Map. The consultant should comment on the acceptability of proposed septic leac field placement from a geotechnical perspective. The results of this plan review should be summarized by the consultant in a letter and submitted io the Town for review by the Town Geotechnic 1 Consultant prior to ap•royal of the Tentative Map. 4. Construction Plan Re iew- Due to the presence of soils identified as highl and critically expansiv- by the project geotechnical consultant, detailed lot specific construction pl ans should be reviewed by the Town Geotechnical Consultant prior to app oval of building permits for residential construction. Respectfully submitted, WILLIAM COTTON AND ASSOCIATES, INC. TOWN GEOTECHNICAL CONSULTANT Ted Sayre Senior Engineering Geologist William R. Cotton Principal Engineering Geologist CEG 882 WRC:TS:rb • • William Cotton and Associates 4gw. CITY OF LOS ALTOS 41., S qct FIRE DEPARTMENT A it .w d ''�v, 10 Almond Avenue P,`, Los Altos, California 94022-2201 • :yr • �@ •Tel: (415) 948-2404 (*' Fax: (415) 949-2692 oeaa® March 14, 1995 RECEIVED. Town of Los Altos Hills MAR i 6 1995 Attn Sheryl Koll 26379 Fremont Road TOWN OF LOS ALTOS HILLS Los Altos CA 94022 RE: Tentative Map -Deer Creek Subdivision 27591 Purissima Road File#199-94-TM-IS-ND-GD The Los Altos Fire Department approves the above subject to the following conditions: 1. Install one fire hydrant on Samuel Lane at a location selected by the Fire Department. The hydrant to be installed and ready for use prior to the issuance of building permits. 2. Replace the existing bridge over Deer Creek with one that will support a fire truck with a weight of 35,000 pounds. The new bridge to be built and ready for use prior to the issuance of building permits. 3. Residential fire sprinklers are to be installed in each residence as noted on the plans. 4. Provide a fire truck backaround at the terminus of the driveways serving lots 1 & 2. The street name selected, Samuel Lane, is acceptable to the Fire Department. Sincerely, .41/1'1j6-e/ Stu Farwell Los Altos Fire Department lkc RESPONSIVE-INNOVATIVE-CONCERNED ((YM•..�i n ��Zsr To n of Los Altos Hills 4/13/95 To: Planning Commissi .n & Staff From: 'Les Earnest, Pathways Committee Chair Subject: Pathway requests 27951 Purissima Road; D • •r Creek Subdivision: Amend our earlier (4/12/95) recommendatio by increasing the wi • th of the 200 foot phill pathway easement from 20 feet to 30 feet to accomodate needed switchbacks. Note: where construction Jr upgrading of paths to the 11-B standard is recommended, this is to in Jude irrigation at least 5 feet away from path and a non-slip surface on . ny crossing driveways. Where there is rpo request we recommend th t in lieu fees be collected where possible. • Town of Los Altos Hills 4/1/95 I ;-- To: Planning Commission & Staff r L i 2) Cc: Katy Stella - From: Les Earnest, Pathways Committee Chair Subject: Pathway requests 13020 Cumbra Vista; Lands of Conradson: Construct II-B path in 12 foot easement along the I-280 frontage from the North boundary of property to the first point where the boundary-changes-direction, then along a 10% descending slope to the boundary with 13019 Cumbra Vista. Also provide a 10 foot easement over driveway from the end of Cumbra Vista and along the South boundary of the property to the pathway easement described above and construct a II-B path on the part beyond the driveway. 25879 Fremont Road; Lands of Wong: Restore II-B path along Fremont. 27078 Fremont Road; Lands of Kawasaki: Restore II-B path along Fremont as needed. 14127 Miranda Road; Lands of Curley: Restore II-B paths along Fremont and Miranda. 26879 Moody Road; Lands of Yanez: Construct II-B path in easement parallel to Moody Road. 24025 Oak Knoll Circle; Lands of Lohr: No request. 27951 Purissima Road; Deer Creek Subdivision: Construct II-B path along Purissima and in a 10 foot easement along the North side of the property from Purissima to the corner then along the East side of the property to a point 10 feet beyond the boundary between 12829 and 12849 Canario Way, where a future pathway may connect to Canario Way. The slope of the path shall not exceed 10%, in, general, a bridge or culvert crossing Deer Creek shall be constructed and the easement going uphill from the creek for a distance of 200 feet shall be 20 feet wide to- accomodate switchbacks. 26707 Tanglewood; Lands of Lloyd: Pathway easement over Tanglewood Lane for future pathway connection to Chaparrel Way. Note: where construction or upgrading of paths to the II-B standard is recommended, this is to include irrigation at least 5 feet away from path and a non-slip surface on any crossing driveways. Where wherethere is "no request" ewe recommend that in lieu fees • ENVIRON 11:N'1 A1., DESIGN CONINIIT EE SUI DIVISION EVALUATION Developer/Owner ,,`a - C/2e SU.w/ V , Location .75-"t (/vie/s-S/A-1,41, By; ,6-7W. GD�(. ���1e-a-. a- cr/Yd/Z-4.<' Date: /e2e 4vfr7>'4 Existing Trees: (Comment o size, type, condition, location with respect to building sites) f-G //c.0io s /V ?( 7 CSE A t 8,6,0cc (42„3-14,,K) LG/1G /77-L a>£-e- v/ci>r, 410 Proposed Grading: (Impact on Later table, nearby vegetation. Erosion potential. All grading 4 least 10' from property line?) /r .5 bME-- c/T `7t' zoc/9"77DAJ o/v o 77 5,;(2PF Creeks and drainage: (Should a conservation easement ble recommended? Will construction impact wildlife migration (bridges, fences)?) 0)-11 ( ' ED CD IV5 /f s /' �S �y:n`1 I 1. s 7V0% C/�/OTJ�// neLV-i 7 D� Of� 5'44 . ry ` 6 "Iii 2 1'u ��e� /CD/ e f" //ewe / / (A Ake/ 1 propeK fel /VDT /0A/1 SSW S,? ‘76-Cher Comments:', erre /s. Q`?Q//e Pref.- k' I — >-141.--14--k- 74 7C cjic' a,h4j/-17 `U,// l2 t �`�-�v6� zui ` i °SP1 I7CL1 ? /Ciec jeA-a_"C7 GC Q.� �/ 11}erac c'4„,1--- " 7 c"d-- 4;e Santo Clara Valley Water District A.CLIVL[) 5750 ALMADEN EXPRESSWAY SAN JOSE, CA 95118.3686 MA 1 5 1995 TELEPHONE2 FACSIMILE (408)266-0271 TOWN OF LOS AL TOS N1LLS AN AFFIRMATIVE ACTION EMPLOYER March 14, 1995 Mr. William Heiss Jennings-McDermott-Heiss, Inc. 950 South Bascom Avenue, Suite 2111 San Jose, CA 95128 Dear Mr. Heiss: Subject: Tentative Map for Lindy Properties I—APN 175-43-034 on Deer Creek—File 19549. I received your request for District requirements for the construction of a pedestrian bridge across Deer Creek at the northerly end of APN 175-43-34. The pedestrian bridge should span the existing channel with no supports in the main channel area. The soffit elevation of the bridge would preferably be 1 foot above the 1 percent water surface elevation, however, it could be allowed to encroach into that area if it is designed to withstand the forces of the 1 percent flow and it does not impact flooding upstream. In no case should the soffit elevation be below the existing bank elevation. If the proposed bridge will be designed to encroach into the 1 percent flow, you should assume that debris is completely blocking the bridge railing when determining design forces and upstream hydraulic impacts. If you have any other questions, please let me know. Sincerely, Marc J. Klemencic, P.E. Supervising Engineer Design Coordination Division cc: Mr. Jeff Peterson Town of Los Altos Hills 26379 Fremont Road Los Altos Hills, CA 94022 e Santa Clara Valley Water District ECLIVLD 5750 ALMADEN EXPRESSWAY MAR 5 SAN JOSE, CA 95118.3686 1.995 TELEPHONE (408)265.2600 TOWN OF LOSi A51.10SHILLS FACSIMILE (408)266.0271 AN AFFIRMATIVE ACTION EMPLOYER March 14, 1995 Mr. William Heiss Jennings-McDermott-Heiss, Inc. 950 South Bascom Avenue, Suite 2111 San Jose, CA 95128 Dear Mr. Heiss: Subject: Tentative Map for Lindy Properties I—APN 175-43-034 on Deer Creek—File 19549. I received your request for District requirements for the construction of a pedestrian bridge across Deer Creek at the northerly end of APN 175-43-34. The pedestrian bridge should span the existing channel with no supports in the main channel area. The soffit elevation of the bridge would preferably be 1 foot above the 1 percent water surface elevation, however, it could be allowed to encroach into that area if it is designed to withstand the forces of the 1 percent flow and it does not impact flooding upstream. In no case should the soffit elevation be below the existing bank elevation. If the proposed bridge will be designed to encroach into the 1 percent flow, you should assume that debris is completely blocking the bridge railing when determining design forces and upstream hydraulic impacts. If you have any other questions, please let me know. Sincerely, 019" , Marc J. Klemencic, P.E. Supervising Engineer Design Coordination Division • cc: Mr. Jeff Peterson Town of Los Altos Hills 26379 Fremont Road Los Altos Hills, CA 94022 County of Santh Clara L,Ol . � 1 RECEIVED � � , ii� o E=nvironmental Resources gel WV Department Of I;nvir(ntn ( nRRtl I lealtil y \ _ f. ; ou North County Office MAR 2 8 1995. � "� (i60 So. f-airoaks Avenue Sunnyvale. California 9408(i TOWN OF LOS ALTOS HILLS f G` (408)737-8933 FAX 735-8529 March 22 , 1995; I Sheryl Kolf Planning Department Town of Los Altos Hills - 26379 Fremont Rd. Los Altos Hills, CA 94022 • Regarding tentative map for Deer Creek Subdivision, 27591 Purissima Rd. , file #19'-94-TM-IS-ND-GD Dear Sheryl: After reviewing the enc osed set of plans (27591 Purissima Rd. ) , lot #3 will require a p-rcolation test on the new proposed leachfield. The origin- 1 percolation tests on lot #3 are not valid since the propose. leachfield has been moved to another location. Lot #1 and Lott #2 do no require any changes from submitted proposals . The proposed skeptic sys ems on lot #1 and #2 are for homes that do not exceed 14 bedroom- and 4500 square feet. Larger homes will require a systlem upgrad- . System size will be determined for lot #3 upon satisfactory co pletion of percolation tests . If any further question , please contact the undersigned at (408) 737-8933 , Tuesday throu.h Friday, 7 : 30am to 9 : 00am. DAVID WIJTMAN ,, R.E .H .S . ENVIRONMENTAL 'HEALTH SPECIALIST CONSUMER PROTECTION DIV SION DEPARTMENT OF ENVIRONME TAL HEALTH DW: jm Ilo.rr(t of Supervisors: MidiutJ M. I loll(Id. 'flan(;i,:\Iv;uu(IO. I((aa (; In-L il( s. .I;tnu•s T. Ii(•ull Jr.,. Iti;uatu•Mc-K(•nia;a (:(Hutt\ lix(•c•tIlivr: I(icl nrtl \4'it ni,(•r}; '0°' ECEIVED'R County of Santa Clara ,ouNy Environmental Resources Agency -zI 01 Department of Environmental Ileailth JANA25 5 } T „ North County Office 660 So. Iairoaks Avenue _ Sunnyvale, California 94086TOWN of LQ .rQ$ CV�¢� (408)737-8933 FAX 735-8529 January 18, 1995 Shannon D. Paboojian Lindy Properties 1 . 12280 Saratoga Sunnyvale Rd. #101 Saratoga, CA 95070 Regarding Deer Creek subdivision, 27591 Purissima Rd. wet weather soil testing. The Department of Environmental Health has reviewed the soils report prepared by Terra search and Mr. Cotton ' s letter which both pertain to the 3 lot subdivision located at 27591 Purissima Rd. in Los Altos Hills. This letter will address the concerns of Santa Clara County and the concerns of the town of Los Altos Hills. Item #1 - A wet weather soil profile trench must be dug in each of the 3 proposed leachfield areas (primary and secondary leachfields) of lot #3. These trenches must be at least ten (10) feet deep and must start below the fill material. Test trenches may be dug with fill in place, but must accommodate fill depth. Example: If the fill depth is 3 feet, a trench depth of 13 feet is required. Item #2,. - Wet weather soil profile trenches will also be required on lot #1 in both primary and secondary leachfields. • Item #3 - Prior to final map recordation, each lot must have an approvable septic system layout for each building site. Each building site must indicate the size of the proposed building (square footage) . • Item #4 - All fill must be removed from leachfield areas prior to construction. The final map must state this requirement. Upon completion of the soil profile trenches on lots 1 and 3 , • Environmental Health will be able to respond to the town ' s question regarding leachfield lines located upslope of the residence on lot #3 . d I. Shannon D. Paboojian Page 2 January 18, 1995 Please contact the under - igned at (408) 73778933 from 7: 30am to 9 :00am, Tuesday through riday to arrange for soil profile trenches. The trenches ay be dug from January 1995 through March 31, 1995. If they are not completed during this time period, it may be necess- ry to delay testing until the 1995-1996 6rai y season. cjj#1711 LWE .WIJTMAN:. :R.:E.H.S. ENVIRONMENTAL HEALTH SPECIALIST CONSUMER PROTECTION DIVISION DEPARTMENT OF ENVIRONMENT. L HEALTH DW: jm , cc Town of Los Altos Hill . fO `op RBS; County of Santa Clara z:;oUN ��\ r/� 0` Environmental Resources Agency �� i .n Department of Environmental 1-lcaith rft=1North County Office 660 So. Fairoaks Avenue IN taw Sunnyvale, California 94086 j,`‘ (408)737-8933 FAX 735-8529 — November 10, 1994 Lindy Group 12280 Saratoga Sunnyvale Rd. #101 Saratoga, CA 95070 To whom it may concern: A tentative map has been submitted by the Lindy Group, addressing the lot subdivision located at 27591 Purissima Rd, Los Altos Hills. The Lindy Group have completed the percolation test, located primary and secondary septic drainfields and defined drainline lengths within drainfields . David Wijtman, Environmental Health Specialist for Santa Clara County Environmental Health Department has reviewed the tentative map for the subdivision at 27591 Purissima Rd. The Lindy Group have met tentative subdivision requirements. THIS IS NOT A FINAL APPROVAL for septic systems on each lot . DAVID WIJTMAN, R.E.H.S. ENVIRONMENTAL HEALTH SPECIALIST CONSUMER PROTECTION DIVISION DEPARTMENT OF ENVIRONMENTAL HEALTH DW: jm • • Board of Supervisors: Michael M. I IOnrlil, Zoe Lill};ren, Icon Gonzales. Itocl I)iriclon, I)innnc McKenna Bare