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PC Summary 11-25-2014 City of Cupertino ,,, 10300 Torre Avenue Cupertino,CA 95014 (408) 777-3308 C U P E RT 1 N C) FAX (408) 777-3333 Community Development Department To: Mayor and City Council Members From: Aarti Shrivastava, Assistant City Manager Date: November 26, 2014 Subj: REPORT OF PLANNING COMMISSION DECISIONS MADE November 25,2014 Chapter 19.32 of the Cupertino Municipal code provides for appeal of decisions made by the Planning Commission 1. A�lication EXC-2014-09, TR-2014-42, Daryl Harris (Yao/Li residence), 21730 Rainbow Dr Hillside Exception to allow the development of a 5,213 square foot single family residence with a 1,412 square foot basement on slopes greater than 30%; Tree Removal Permit to allow the removal and replacement of three specimen size Coast Live Oak trees Action The Planning Comrnission approved the application(s) on a 5-0-0 vote. Enclosures: Planning Commission Report November 25, 2014 Planning Commission Resolution(s) 6768&6769 Plan Set g:planning/I'ost Hearing/summary to cc112514 OFFICE OF COMMUNITY DEVELOPMENT � CITY HALL 10300 TORRE AVENUE • CUPERTINO,CA 95014-3255 C U P E RT 1 N O (408)777-3308 • FAX(408)777-3333 • plannine@cupertino.org PLANNING COMMISSION STAFF REPORT Agenda Item No. 3' Agenda Date: November 25, 2014 Application: EXC-2014-09, TR-2014-42, (EA-2014-07) Applicant:Daryl Harris Property Owner: Jonathan Yao, Cathy Li Property Location: 21730 Rainbow Drive (APN 366-37-007) APPLICATION SUMMARY: Residential Hillside Exception to allow the development of a new 5,213 square-foot single- family residence with a 1,412 square foot basement on slopes greater than 30%. Tree Removal Request to allow the removal and replacement of three (3) Coast Live Oak trees each exceeding 10-inches in diameter. RECOMMENDATION: Staff recommends that the Commission approve: • A mitigated negative declaration for the project(EA-2014-07), • The Residential Hillside Exception (EXC-2014-09) per the draft resolution (see Attachment 1), and • The Tree Removal Request(TR-2014-42) per the draft resolution (see Attachment 2) PROJECT DATA: Project Feature Ordinance Proposal Consistency Requirement with City Ordinance Residential Building Square Footage Total Proposed Building Area 5,322 sq. ft. max. 5,213 sq. ft. Yes Gara e(2-car) 441 s . ft. min. 498 s . ft. Yes Living Area (1St floor) n/a 2,347 sq. ft. Yes EXC-2014-09,TR-2014-42(Er-�-2014-0� Yao/Li Residence November 25,2014 Project Feature Ordinance Proposal Consistency Requirement with City Ordinance Setbacks 1St Floor 2nd Floor 1St Floor 2nd Floor Front 10' min. 25'min. 67' 79' Yes (grade >20%) Sides 10' min. 15' min. 203' 203' Yes Rear 20' min. 25' min. 42' min. 42' min. Yes Other Requirements Building Height 30' max. 25.5' Yes Slope Exception required Onsite topography varies Yes, with for> 500 square feet from 32°/o to 58% slope. exception of development on requested for slopes of 30%or development more. on slo e. Grading Quantity in cubic 2,500 cubic yards 2,245 cubic yards Yes yards max. Parkin 6 s aces min. 6 s aces Yes BACKGROUND: Project Site£�Development Requests The lot is vacant and surrounded by hillside single-family residences to the north, east, south and west. The lot is a steeply angled, north-facing slope, ranging with a 32% to 58% gradient, completely covered with vegetation, consisting of scattered clusters of Coast Live Oaks but mainly shrubs: Coyote Brush, Poison Oak and Chamise. The property is accessed via a curvilinear private driveway that is an extension of the westerly terminus of Rainbow Drive. The Planning Commission approved hillside exceptions for two new hillside residences at 21740 & 21750 Rainbow Drive a couple of years ago. 21750 Rainbow is built and 21740 is under construction. The applicant, Daryl Harris of RH Associates is requesting two City approvals: 1) A Hillside Exception to allow the development of a new, 5,213 square foot, single-family residence on a slope greater than 30%in a RHS zoning district, and 2) A Tree Removal Permit to allow the removal and replacement of three (3) Coast Live Oaks 10 inches or mare in trunk diameter that will be affected by the residential development and grading. EXC-2014-09,TR-2014-42(Er�-2014-07) Yao/Li Residence November 25,2014 Residence Description The proposed residence is located in the middle of the lot separated from several clusters of oak trees. The residence site is accessed via a proposed driveway that bisects two clusters of oaks. The proposed driveway must generally follow the contours of the land to limit its steepness and in order to comply with Fire Department standards for emergency accessibility to the residence. The large driveway pad at the end of the driveway is required to provide sufficient flat area for onsite parking spaces and a required fire truck turnaround. These functional areas are not allowed to overlap and contribute towards a significant amount of the site grading proposed. Due to the sloping conditions, a pier and grade beam foundation is required. There is an excavated, below natural grade, basement and two floors of living space. Grading cuts for the development foot print necessitate both down slope and up slope retaining walls. The applicant has worked with staff to push the residence into the hill to the maximum extent possible to minimize the height of the front yard, downhill facing retaining wall to 5' -7.5' (Attachment 3). The tall, tiered rear yard retaining walls (maximum aggregated height of 20') are proposed to stabilize the upslope of the project site and will be largely screened from public views by the two-story residence. A small graded yard area with swimming pool is also depicted in the site plan. The building colors and roof material depicted in the plan set complies with RHS design standards, which require muted vegetative or earth tones with low light reflectance values of 60 or less (Attachment 4). DISCUSSION: Prominent Ridgelines Analysis An RHS-Ordinance identified prominent ridgeline exists upslope of this lot following the Pacific, Gas & Electric (PG&E) power transmission corridor. The house is sited in a manner that its highest roof ridgelines do not encroach into a 15% sight line from that ridgeline in accordance with RHS development standards. Exception for Development on Slopes Greater Than 30% The Residential Hillside Ordinance (RHS) prohibits any structures or improvements over 500 square feet in area on slopes greater than 30% unless an exception is granted. The intent of this rule is to minimize and discourage unnecessary hillside grading activities and visual disturbances. However, if the project/property presents unique circumstances or hardships (typically physical/topographic challenges), then the City may consider an exception provided that the project is designed to minimize the extent of the exception and impacts to the surround hillside. The siting and design of the house minimizes the removal of the oak trees and reduces the visibility of the retaining walls necessary to develop the property in a safe manner. The City has historically granted exceptions to allow reasonable development of steeper hillside properties planned for residential use. The entire property is steeply sloped with slopes ranging from 32% to 58%. The property cannot be developed without a hillside exception request. With the exception of the proposed EXC-2014-09,TR-2014-42(Eh-2014-07) Yao/Li Residence November 25,2014 development on a slope over 30%, the proposed home complies with all other aspects of the RHS-Hillside Zoning Ordinance. Geological Review A geotechnical investigation for the project has been prepared by Wayne Ting &Associates (Attachment 5) and a Geologic Hazard Evaluation by Buckley Engineering Assocates, Inc. (Attachment 6). Both reports were reviewed by the City Geologist (Attachment 7). The City Geologist concluded that sufficient information has been presented to demonstrate the geotechnical feasibility of the proposed residence and recommends approval of the hillside exception from a geologic and geotechnical standpoint. The applicant has also worked with both the City Geologist and Public Works Department to design the drainage system for the site using a large, underground storm water detention tank to store peak storm flows, which are later release to storm drainage facilities after the peak period. This type of drainage system has been approved and constructed in other recent hillside construction projects and will be reviewed and approved by Public Works staff. Based on the City Geologist recommendation, the site grading will only be performed during the dry summer/fall months. The recommendations of the private engineers and the City Geologist have been incorporated as a condition in the approval resolution. Trail Considerations In 1979, City approval of the Rainbow's End subdivision (Tract No. 5990) included the dedication of a pedestrian and equestrian easement of 40-feet in width from the Rainbow Drive cul-de-sac following a private driveway for 260 feet before it connected to a 20-foot wide easement that ran through 21730 and 21720 Rainbow Drive to the Fremont Older Open Space Preserve owned by the Midpeninsula Regional Open Space District. The access easement through these private lots was never improved or used (Attachment 8). Pedestrian access along this dedicated route is problematic due to the steep topography along portions of the easement. In the meantime, open space preserve users created an alternative access, essentially an informal trail, through 21730 and 21740 Rainbow Drive to access the Fremont Older Preserve as depicted in the aerial photo below. This informal neighborhood trail has been in existence for at least two decades and is avidly used by local residents to access Fremont Older Preserve. EXG2014-09,TR-2014-42 (Eh-2014-07) Yao/Li Kesidence November 25,2014 Year 2000 Aerial Photograph of Property and Environs Depicting Informal Trail �T lk�'.,ilF��F � � '� � � �"�r.I�� ,F .vF my,. ��' � ��„�. .. -t �k�.a., ''� � # ��. '� F'•5` •s A °�' .'a_ . �" �'q, ' � �'� � � '� ��► x. a °� . . ��. 4,r �. #� �,..t �.?, ��WLr �My� a ^,�L,, �4�r�.+,. a, . q .�. b d . v� R, . .� s �t.3 °�, `<°� V', �,�'�F.. . �.�� -�+�*� .� "�. �� °� ��.. �J�� .. �� ' ` �,' �' °:y ° � . ,� �� p AiA,r,; �� ' „�� tj.S k7 . . �� ..: ^ �"'�a ��A! yt s��?'�r r �. �s � y� �r�� .�. `' ^' . �.!* �+ ��*^' � , . .,'�M rt�,�� + •�� , �`� � �. �� . , �. ,. ,� ,, . ;. �. s �� r� �1�".�- � �� ,, > ;� , � 1�• *.,��.�� ,� �F � ,�� '`�+��ir1 �", °�1► �:� r #� � � � a r a* � � � �wv� �� %. �� p ��'� � • '�a' £d ��i;"° Cvi. 't ]f � 4� ��„ � �., �� r� % � ��`�"�� 1 yS 1� ,s fe v°� � � , w � ; � �� . m � �� . . ' � + , . >,' `''�"� � �� ----..._ .� `51�"+��. .. . � �r_.:�_.___._.. . � � � .. ,�.°-. ,� x , „ Jl ��e " ��t" . 9 . � ��_,; � Fremont Older Open Space Pi-eserve ��° d7'�a��,��,-,��,�,«�.�;�.° ,�, ,w��;* � � � a,�... .� �, � N�r ` o t � � ��.�.'i�. � � 3 1i # � `'� � �.. .#r `� .'� � I'�j .�s .��^t.. a�' � ..�`,r ��yr�,, , � l� � .T,. *..�� . ��" , • .e �'�n 'f. � '�� ;.� � A �_.. . ». ��'4`� � �* tri �:� �+� }" «�•- . � Subject Property � � � Existing Informal Trail As part of this project, the property owner has agreed to move the existing pedestrian and equestrian easement to a more accessible area in exchange for City abandonment of the current easement and the creation of a pedestrian access easement through the rear of his property which would connect to other informal trails across adjacent property ultimately terminating at the Fremont Older Preserve. This would include an easement along the front of this property connecting to the pedestrian easement across the property. Part of this easement effort will involve a summary vacation of the existing 20-foot wide pedestrian/equestrian easement that runs across the property frontage in exchange for a pedestrian/public access easement that continues along the driveway to the trail access pouzt and across the rear of the property. Further, the applicant will need to realign the existing informal trail so that it does not overlap with the newly proposed driveway to the residence. This will involve additional grading and improvements to facilitate this new trail alignment so that access can be maintained across the trail. Ultimate use of the trai] will require the EXC-2014-09,TR-2014-42(Eh-2014-07) Yao/Li Residence November 25,2014 cooperation of adjacent landowners as hikers will need to cross their properties in order to access the Fremont Older Preserve. Adjacent, affected property owners have verbally agreed to facilitate access to the trail across applicant's property that ultimately leads to the Preserve. Conditions have been added to the Hillside Exception resolution to memorialize the exchange of pedestrian easements and development of trail access to Fremont Older Open Space Preserve. Tree Removal Request A tree report was prepared by the applicant's arborist and revised on September 2014. There are a total of 33 oaks on the property. The applicant has requested the removal of three specimen size oaks to facilitate the development of the residence. The noted trees are numbered: 12, 22 & 33. The City Arborist and staff have reviewed the report and in the City Arborist's comments (Attachment 10), trees no. 12 and 22 do not require tree removal permission from the City because the former is a large shrub and the latter is an under-ordinance-size Coast Live Oak. Based on the City Arborist's observations and recommendations, staff is recommending the removal of specimen size oaks #6 and #30, in addition to #33 as presented in the table below: Tree No. Tree Diameter(in.) Staff Recommendation Comments 6 17.7"/16.8" Allow removal. Can't achieve buffer. Retaining walls & storm line trenching too close. 30 26.6" Allow removal Retaining walls encroach too closel to tree trunk. 33 23.1" Allow removal Too close to driveway and radin . Staff believes the other specimen size oaks near the construction area can be protected by minor realignments of the entry driveway and routing the storm drainage lines and relocating the water detention tank outside of the dripline of the protected oaks. Note that City Arborist's recommendations have been incorporated into the conditions of the tree removal resolution. Based on their trunk diameters, the following replacement mitigation is required for the removed trees. Tree Replacement Requirements for Removed Oak Trees Tree No. Tree Diameter(in.) Oak Tree Re lacement Requirement 6 17.7"/16.8" 2, 24-inch box oaks 30 26.6" 2, 24-inch box oaks 33 23.1" 2, 24-inch box oaks EXC-2014-09,TR-2014-42(Er�-2014-07) Yao/Li Residence November 25,2014 Staff is recommending the higher quantity of smaller box trees, that is, a total of 6, 24-inch box oaks, rather than, a few of the 36-inch box oaks because of the need to screen grading cuts and retaining walls from public visibility and potential screening of the trail from the residence. ERC/Environmental Considerations The Environmental Review Committee reviewed the proposal on October 16, 2014, and recommended the adoption of a mitigated negative declaration for the project. The Committee recommended that the Planning Com.mission evaluate the placement of a trail across the property to the Fremont Older Open Space Preserve, by swapping an unused, onsite, existing trail easement for a newly created trail easement along an existing informal trail or a realignment of the trail. Geotechnical concerns would be mitigated by following the recommendations of the City Geologist. Permit Streamlining Considerations In accordance with the state Permit Streamlining Act, the application was filed on July 30, 2014 and an incomplete letter was mailed by the City on August 29, 2014 within the 30-day deadline. Applicant responded to all comments and the application was deemed complete on October 2, 2014. The Environmental Review Committee determined a mitigated negative declaration was warranted on the project on October 16, 2014. If the Planning Commission acts on the application tonight, it would be within the statutory deadline of December 16, 2014. Hillside Exception Findings To approve the hillside exception, the Planning Commission must make the findings below. Staff comments are in italics: L The proposed development will not be injurious to property or improvements in the area nor be detrimental to the public health and safety. Staff Comments: The development will comply with planning, building, public works and fire department regulations to protect public health and safety. 2. The proposed development will not create a hazardous condition for pedestrian or vehicular traffic. Staff Comments: The development is setback from the common drivewa� and does not create a hazardous condition for pedestrian or vehicles. 3. The proposed development has legal access to public streets and public services are available to serve the development. Staff Comments: The residence will have access to Rainbow Drive and all utilities are located in the abutting private street. 4. The proposed development requires an exception, which involves the least modification of, or deviation from, the development regulations prescribed in this chapter necessary to accomplish a reasonable use of the parcel. EXC-2014-09,TR-2014-42(Et�-2014-07) Yao/Li Residence November 25,2014 Staff Comments: The exception for development on slopes greater than 30% is the only exception required. Due to the steep slopes of the property, it cannot be developed with a residence unless an exception is granted. The development otherwise meets all other RHS development standards. 5. All alternative locations for development on the parcel have been considered and have been found to create greater environmental impacts than the location of the proposed development. Staff Comments: The project is located in the middle of the lot that avoids encroaching on a prominent ridgeline and minimizes the number of oaks that must be removed. Other driveway alignments will cause more grading and need retaining walls. 6. The proposed development does not consist of structures on or near known geological or environmental hazards that have been determined by expert testimony to be unsafe or hazardous to structures or persons residing therein. Staff Comments: Geologic studies demonstrate the lack of unmitigable geologic hazards. 7. The proposed development includes grading and drainage plans that will ensure that erosion and scarring of the hillsides caused by necessary construction of the housing site and improvements will be minimized. Staff Comments: Proposed grading will minimize visible retaining walls and drainage plans will minimize the introduction of storm flows into steep, hillside soils. 8. The proposed development consists of structures incorporating designs, colors, materials, and outdoor lighting which blend with the natural hillside environment and which are designed in such a manner as to reduce the effective visible mass, including building height, as much as possible without creating other negative environmental impacts. Staff Comments: Grading design will minimize visible retaining walls. Building materials and colors will meet RHS design standards. 9. The proposed development is located on the parcel as far as possible from public open space preserves or parks (if visible therefrom), riparian corridors, and wildlife habitats unless such location will create other, more negative environmental impacts. Staff Comments: The proposed residence will not be visible from the nearby public open space preserve. 10. The proposed development is otherwise consistent with the City's General Plan and with the purposes of this chapter as described in Section 19.40.010. Staff Comments: The development is consistent with the RHS zoning ordinance which implements the General Plan's hillside protection policies. EXC-2014-09,TR-2014-42(�h-2014-07) Yao/Li Residence November 25,2014 Prepared by: Colin Jung, Associate Planner Reviewed by Approved by /s/Gar�Chao /s/Aarti Shrivastava Gary Chao Aarti Shrivastava Assist. Dir. of Community Development Assistant City Manager ATTACHMENTS: 1- Draft Resolution for EXC-2014-09 2- Draft Resolution for TR-2014-42 3- Rendering of Residence, street view 4- Exterior Materials Board 5- Geotechnical Investigation/I'roposed Yao Single-Family Structure/21730 Rainbow Drive/Cupertino, CA 95030 prepared by Wayne Ting and Associates, Inc. and dated March 2013. 6- Geologic Hazard Evaluation for a Proposed Residence/21717 Rainbow Drive/Cupertino, Califomia Prepared for Mr. Wang Ting/Wayne Ting & Associates, Inc./Prepared by Buckely Engineering Associates, Inc. and dated March 14, 2013 7- Geologic and Geotechnical Peer Review/Yao, Proposed New Residence/21730 Rainbow Drive prepared by Cotton, Shires and Associates, Inc. and dated August 8, 2014. 8- Rainbow's End Final Subdivision Map, Tract No. 5990 9- Tree/Site Inventory prepared by Richard Smith, Certified Arborist, dated revised 9/22/14 10-A Review of Proposed Construction/21730 Rainbow Dr.by Michael Bench, City Arborist Dated October 16&28, 2014 11-Initial Study, ERC Recommendation 12-Plan set EXC-2014-09 CITY OF CUPERTINO 10300 Torre Avenue Cupertino, California 95014 RESOLUTION NO. 6768 OF THE PLANNING COMMISSION OF THE CITY OF CUPERTINO APPROVING A HILLSIDE EXCEPTION TO ALLOW THE CONSTRUCTION OF A NEW 5,213 SQUARE FOOT SINGLE FAMILY RESIDENCE WITH A 1,412 SQUARE FOOT BASEMENT ON SLOPES GREATER THAN 30%AT 21730 RAINBOW DRIVE SECTION I: PROTECT DESCRIPTION Application No.: EXC-2014-09 (EA-2014-07) Applicant: Daryl Harris Location: 21730 Rainbow Drive, APN# 366-37-007 SECTION II: FINDINGS FOR EXCEPTION WHEREAS, the Planning Commission of the City of Cupertino received an application for a Hillside Exception, as described on Section II of this Resolution; and WHEREAS, the necessary notices have been given in accordance with the Procedural Ordinance of the City of Cupertino, and the Planning Commission has held one or more Public Hearings on this matter; and WHEREAS, the applicant has met the burden of proof required to support this application, and has satisfied the following requirements: 1. The proposed development will not be injurious to property or improvements in the area nor be detrimental to the public health and safety. 'The development will comply with planning, building, public works and fire department regulations to protect public health and safety. 2. The proposed development will not create a hazardous condition for pedestrian or vehicular traffic. The development is setback from the common driveway and does not create a hazardous condition for pedestrian or vehicles. 3. The proposed development has legal access to public streets and public services are available to serve the development. The residence will have access to Rainbow Drive and all utilities are located in the abutting driveway. 4. T'he proposed development requires an exception, which involves the least modification of, or deviation from, the development regulations prescribed in this chapter necessary to accomplish a reasonable use of the parcel. The exception for development on slopes greater than 30% is the only exception required. The development otherwise meets all other RHS development standards. 5. All alternative locations for development on the parcel have been considered and have been found to create greater environmental impacts than the location of the proposed development which is located in the middle of the lot that avoids encroaching on a prominent ridgeline and Resolution No.6768 EXC-2014-09 November 25,2014 minimizes the number of oaks that must be removed. Other driveway alignments will cause more grading and need retaining walls. 6. The proposed development does not consist of structures on or near known geological or environmental hazards that have been determined by expert testimony to be unsafe or hazardous to structures or persons residing therein. Geologic studies demonstrate the lack of unmitigable geologic hazards. 7. The proposed development includes grading and drainage plans that will ensure that erosion and scarring of the hillsides caused by necessary construction of the housing site and improvements will be minimized. Proposed grading will minimize visible retaining walls and drainage plans will minimize the introduction of storm flows into steep,hillside soils. 8. The proposed development consists of structures incorporating designs, colors, materials, and outdoor lighting which blend with the natural hillside environment and which are designed in such a manner as to reduce the effective visible mass, including building height, as much as possible without creating other negative environmental impacts. Grading design will minimize visible retaining walls. Building materials and colors will meet RHS design standards. 9. The proposed development is located on the parcel as far as possible from public open space preserves or parks (if visible therefrom), riparian corridors, and wildlife habitats unless such location will create other, more negative environmental impacts. The proposed residence will not be visible from the nearby public open space preserve. 10. The proposed development is otherwise consistent with the City's General Plan and with the purposes of this chapter as described in Section 19.40.010. The development is consistent with the RHS zoning ordinance which implements the General Plari s hillside protection policies. NOW, THEREFORE, BE IT RESOLVED: That after careful consideration of the initial study, Environmental Review Committee recommendation, maps, facts, exhibits, testimony and other evidence submitted in this matter, the Commission finds that the project with mitigations incorporated will not have a significant environmental impact and adopts a mitigated negative declaration with a mitigation monitoring report (file no. EA-2014-07) and application no. EXC-2014-09 is hereby approved; and That the subconclusions upon which the findings and conditions specified in this Resolution are based and contained in the Public Hearing record concerning Application EXG2014-09, as set forth in the Minutes of the Planning Commission Meeting of November 25, 2014 and are incorporated by reference herein. SECTION III: CONDITIONS ADMINISTERED BY THE COMMUNITY DEVELOPMENT DEPT. 1. APPROVED EXHIBITS Approval is based on the plan set titled: "A PROPOSED RESIDENCE FOR:/ JONATHAN YAO & CATHY LI/21730 RAINBOW DRIVE CUPERTINO, CALIFORNIA" dated July 2014, and consisting of 16 sheets labeled A1 through A9, C.0 and C-1 through C-6 except as may be amended by the conditions contained in this resolution. Resolution No.6768 EXC-2014-09 November 25,2014 2. EXTERIOR BUILDING MATERIALS/TREATMENTS, LANDSCAPING Final building exterior treatment plan (including but not limited to details on exterior color, material, architectural treatments and/or embellishments, lighting, retaining walls and landscaping) shall be reviewed and approved by the Director of Community Development prior to issuance of building permits for compliance to RHS zoning and other relevant regulations. Any exterior changes determined to be substantial by the Director of Community Development shall require a modification approval with neighborhood input. 3. NOTICE OF FEES DEDICATIONS, RESERVATIONS OR OTHER EXACTIONS The Conditions of Project Approval set forth herein may include certain fees, dedication requirements, reservation requirements, and other exactions. Pursuant to Government Code Section 66020(d) (1), these Conditions constitute written notice of a statement of the amount of such fees, and a description of the dedications, reservations, and other exactions. You are hereby further notified that the 90-day approval period in which you may protest these fees, dedications, reservations, and other exactions, pursuant to Goverrunent Code Section 66020(a), has begun. If you fail to file a protest within this 90-day period complying with all of the requirements of Section 66020, you will be legally barred from later challenging such exactions. 4. GENERAL PLAN DEVELOPMENT ALLOCATION The applicant's project is granted a General Plan Development Allocation of one dwelling unit from the Other Residential Neighborhoods allocation pool. 5. LANDSCAPE PROTECT SUBMITTAL Prior to issuance of building permits, the applicant shall determine in consultation with staff whether a full landscape project submittal per section 14.15.040 of the Landscaping Ordinance is warranted. The Water-Efficient Design Checklist (Appendix A of Chapter 14.15), Landscape and Irrigation Design Plans, and Water Budget Calculations shall be reviewed and approved to the satisfaction of the Director of Community Development prior to issuance of building permits. 6. LANDSCAPE INSTALLATION REPORT In conjunction with any required landscape project submittal, a landscape installation audit shall be conducted by a certified landscape professional after the landscaping and irrigation system have been installed. The findings of the assessment shall be consolidated into a landscape installation report. The landscape installation report shall include, but is not limited to: inspection to confirm that the landscaping and irrigation system are installed as specified in the landscape and irrigation design plan, system tune-up, system test with distribution uniformity, reporting overspray or run-off that causes overland flow, and preparation of an irrigation schedule. The landscape installation report shall include the following statement: "The landscape and irrigation system have been installed as specified in the landscape and irrigation design plan and complies with the criteria of the ordinance and the permit." 7. LANDSCAPE AND IRRIGATION MAINTENANCE In conjunction with any required landscape project submittal, a maintenance schedule shall be established and submitted to the Director of Community Development or his/her designee, either Resolution No.6768 EXC-2014-09 November 25,2014 with the landscape application package, with the landscape installation report, or any time before the landscape installation report is submitted. a) Schedules should take into account water requirements for the plant establishment period and water requirements for established landscapes. b) Maintenance shall include, but not be limited to the following: routine inspection; pressure testing, adjustment and repair of the irrigation system; aerating and de-thatching turf areas; replenishing mulch; fertilizing; pruning; replanting of failed plants; weeding; pest control; and removing obstructions to emission devices. c) Failed plants shall be replaced with the same or functionally equivalent plants that may be size- adjusted as appropriate for the stage of growth of the overall installation. Failing plants shall either be replaced or be revived through appropriate adjustments in water, nutrients, pest control or other factors as recommended by a landscaping professional. 8. PERMIT EXPIRATION The subject hillside exception approval shall expire two (2) years from the date of approval if not used. 9. ACCURACY OF PROJECT PLANS The applicant/property owner is responsible to verify all pertinent property data including but not limited to property boundary locations, building setbacks, property size, building square footage, any relevant easements and/or construction records. Any misrepresentation of any property data may invalidate this approval and may require additional review. 10. PRE-CONSTRUCTION MEETING AND CONSTRUCTION MANAGEMENT PLAN Prior to commencement of construction activities, the applicant shall arrange for a pre-construction meeting with the pertinent departments (Building, Planning, and Public Works) to .review the prepared construction management plan, to ensure that construction complies with the conditions of approval, staging of construction equipment is appropriate, tree protection measures are in place, public access routes are defined,and noise and dust control measures are established. 11. BUILDING PERMIT SUBMITTAL REQUIREMENT Applicant shall submit an annotated response to all of these conditions of approval with his building permit submittal. 12. GEOTECHNICAL REVIEW Prior to building permit approval, the applicant shall comply with the recommendations outlined in the Cotton Shires & Associates, Inc. Geologic and Geotechnical Peer Review Letter dated August 8, 2014 and pertaining to the proposed development. 13. LANDSCAPE PLAN As part of the building permit submittal the applicant shall prepare a landscape plan that screens visible retaining walls and grading scars from public street views. The screening shall be accomplished through a combination of trees, shrubs and vines and pigmented concrete matched to the surrounding soils to the satisfaction of the Director of Community Development. 14. GRADING Applicant shall strive to reduce the extent and quantity of grading. City staff shall work with the applicant and the Santa Clara County Fire Department to determine if the Fire Department requirement for an onsite fire truck turnaround can be eliminated in order to reduce grading. Resolution No.6768 EXC-2014-09 November 25,2014 SECTION IV: CONDITIONS ADMINISTERED BY THE PUBLIC WORKS DEPARTMENT 15. GRADING PLAN Conceptual Grading and Drainage plans will need to be modified at the Building Permit stage to satisfy Public Works' preliminary comments regarding proposed storm drain systems. Grading shall be as approved and required by the City Engineer in accordance with Chapter 16.08 of the Cupertino Municipal Code. 401 Certifications and 404 permits maybe required. Please contact Army Corp of Engineers and/or Regional Water Quality Control Board as appropriate. 16. DRAINAGE The proposed infiltration system shown on sheet C-3 is not recommended for hillside projects unless the project geotechnical engineer provides a stamped and signed report with recommendations for installation, and the City's geotechnical engineer reviews and approves the recommendations. The report must include an evaluation of the existing soils and the proposed device with recommendations, and letter stating that the Civil Plans have been reviewed and are consistent with their recommendations. Consider an alternative retention system with facilities that meter storm runoff to a level consistent with the pre-project condition. Storm draina�e lines and other constructed drainage features shall be sited to avoid crossin�the cano�y dri�lines of the�rotected oak trees. Drainage shall be provided to the satisfaction of the City Engineer. Hydrology and pre- and post- development hydraulic calculations must be provided to indicate whether additional storm water control measures are to be constructed or renovated. 17. BEST MANAGEMENT PRACTICES Utilize Best Management Practices (BMPs), as required by the State Water Resources Control Board, for construction activity, which disturbs soil. BMP plans shall be included in grading and street improvement plans. 18. EROSION CONTROL PLAN Developer shall provide an approved erosion control plan by a Registered Civil Engineer. This plan should include all erosion control measures used to retain materials on site. Erosion control notes shall be stated on the plans. 19. UNDERGROUND UTILITIES Developer shall comply with the requirements of the Underground Utilities Ordinance No. 331 and other related Ordinances and regulations of the City of Cupertino, and shall coordinate with affected utility providers for installation of underground utility devices. Developer shall submit detailed plans showing utility underground provisions. Said plans shall be subject to prior approval of the affected Utility provider and the City Engineer. 20. ABOVE GROUND EQUIPMENT ENCLOSURES Electrical transformers, telephone cabinets and similar equipment shall be placed in underground vaults. The developer must receive written approval from both the Public Works Department and the Community Development Department prior to installation of any above ground equipment. Should above ground equipment be permitted by the City, equipment and enclosures shall be screened with fencing and landscaping such that said equipment is not visible from public street Resolution No.6768 EXC-201409 November 25,2014 areas, as determined by the Community Development Department. Transformers shall not be located in the front or side building setback area. 21. IMPROVEMENT AGREEMENT The project developer shall enter into a development agreement with the City of Cupertino providing for payment of fees, including but not limited to checking and inspection fees, storm drain fees, park dedication fees and fees for under grounding of utilities. Said agreement shall be executed prior to issuance of construction perxnits Fees: a. Checking&Inspection Fees: $Per current fee schedule ($2,788.00 or 6%) b. Grading Permit: $Per current fee schedule ($2,618.00 or 6%) c. Development Maintenance Deposit: $ 1,000.00 d. Storm Drainage Fee: $TBD e. Power Cost: '�'� f. Park Fees: $Per current fee schedule($28,875) ** Based on the latest effective PG&E rate schedule approved by the PUC Bonds: Faithful Performance Bond: 100% of Off-site and On-site Improvements Labor&Material Bond: 100% of Off-site and On-site Improvement On-site Grading Bond: 100%of site improvements. -The fees described above are imposed based upon the current fee schedule adopted by the City Council. However, the fees imposed herein may be modified at the time of recordation of a final map or issuance of a building perxnit in the event of said change or changes, the fees changed at that time will reflect the then current fee schedule. 22. WORK SCHEDULE Every 6 months, the developer shall submit a work schedule to the City to show the timetable for all grading/erosion control work in conjunction with this project. 23. OPERATIONS&MAINTENANCE AGREEMENT Developer shall enter into an Operations&Maintenance Agreement with the City prior to final occupancy. The Agreement shall include the operation and maintenance for any non-standard appurtenances in the public right-of-way that may include,but is not limited to, sidewalk, pavers, and street lights. 24. REFUSE TRUCK ACCESS Developer must obtain clearance from the Environmental Programs Manager in regards to refuse truck access for the proposed development. 25. FIRE PROTECTION Fire sprinklers shall be installed in any new building construction to the approval of the City. Resolution No.6768 EXC-2014-09 November 25,2014 26. SANTA CLARA COUNTY FIRE DEPARTMENT A letter of clearance for the project shall be obtained from the Santa Clara County Fire Department prior to issuance of building permits. Clearance should include written approval of the location of any proposed Water Backflow Preventers, Fire Department Connections and Fire Hydrants (typically Backflow Preventers should be located on private property adjacent to the public right of way, and fire departxnent connections must be located within 100' of a Fire Hydrant). 27. FIRE HYDRANT Fire hydrants shall be located as required by the City and Santa Clara County Fire Department as needed. 28. SAN TOSE WATER COMPANY CLEARANCE Provide San Jose Water Service Company approval for water connection, service capability and location and layout of water lines and backflow preventers before issuance of a building permit approval. 29. DEDICATION OF WATERLINES Developer shall dedicate to the City all waterlines and appurtenances installed to City Standards and shall reach an agreement with San Jose Water Services Company for water service to the subject development. 30. DEDICATION OF UNDERGROUND WATER RIGHTS Developer shall "quit claim" to the City all rights to pump, take or otherwise extract water from the underground basin or any underground strata in the Santa Clara Valley. 31. SANITARY DISTRICT A letter of clearance for the project shall be obtained from the Cupertino Sanitary District prior to issuance of building permits. 32. UTILITY EASEMENTS Clearance approvals from the agencies with easements on the property (including PG&E, AT&T, and California Water Company, and/or equivalent agencies) will be required prior to issuance of building permits. 33. NPDES CONSTRUCTION GENERAL PERMIT When and where it is required by the State Water Resources Control Board(SWRCB), the developer must obtain a Notice of Intent(NOI) from the SWRCB, which encompasses preparation of a Storm Water Pollution Prevention Plan(SWPPP),use of construction Best Management Practices (BMPs) to control storm water runoff quality, and BMP inspection and maintenance. 34. C.3 REQUIREMENTS Complete a Project Impervious Surface Data and LID Feasibility Form. C.3 regulated improvements are required for all projects creating and/or replacing 10,000 S.F. or more of impervious surface(collectively over the entire project site). The developer shall reserve a minimum of 4% of developable surface area for the placement of low impact development measures, for storm water treatment, on the tentative map,unless an alternative storm water treatment plan, that satisfies C.3 requirements,is approved by the City Engineer. Resolution No.6768 EXC-2014-09 November 25,2014 The developer must include the use and maintenance of site design, source control and storm water treatment Best Management Practices (BMPs), which must be designed per approved numeric sizing criteria. A Storm Water Management Plan, Storm Water Facilities Easement Agreement, Storm Water Facilities Operation and Maintenance Agreement, and certification of ongoing operation and maintenance of treatment BMPs are each required. All storm water management plans are required to obtain certification from a City approved third party reviewer. 35. WATER BACKFLOW PREVENTERS Domestic and Fire Water Backflow preventers and similar above ground equipment shall be placed away from the public right of way and site driveways to a location approved by the Cupertino Planning Department, Santa Clara County Fire Department and the water company. 36. EXCHANGE OF PEDESTRIAN EASEMENT AREAS Prior to building permit approval, the applicant shall apply to the City far a summary vacation of the 20-foot wide Pedestrian and Equestrian Easement("P.E.E".) along the front of the property. In exchange for this summary vacation of easement, the property owner has agreed to and shall simultaneously dedicate a new 20-foot wide pedestrian easement near the rear and side property lines and extend a connecting pedestrian easement along the private street with the objective of facilitating pedestrian access to the lands of the Fremont Older Preserve currently owned by Midpeninsula Regional Open Space District. The pedestrian easement shall be approved as to form by the City Attorney and shall be granted prior to the issuance of building permits for this project. The Summary Vacation of the existing P.E.E.,by the City Council shall occur prior to building permit issuance for this project. The applicant shall be responsible for the engineering drawings, plat and legal descriptions necessary for the realignment of the trail including that portion of the trail which will continue across the two adjacent properties prior to accessing the Fremont Older Preserve. The trail is relocated on the applicant's property in order to avoid the new driveway requested by applicant. The applicant shall also cooperate with adjacent neighbor(s) to help facilitate the pedestrian access through the lower gate located at the terminus of the Rainbow Drive. 37. MAINTAINING OF PEDESTRIAN ACCESS The property owner shall maintain pedestrian access through the property to facilitate access to the lands of the Midpeninsula Regional Open Space District for the life of this Hillside Exception Approval. Access can be provided either through maintaining the existing informal trail on the property or developing a new trail alignment on the property, subject to prior approval by the City, which shall not be unreasonably withheld. Resolution No.6768 EXC-2014-09 November 25,2014 PASSED AND ADOPTED this 25th day of November 2014, at a Regular Meeting of the Planning Commission of the City of Cupertino by the following roll call vote: AYES: COMMISSIONERS: Chair Brophy, Vice Chair Lee, Gong, Sun, Takahashi NOES: COMMISSIONERS:none ABSTAIN: COMMISSIONERS:none ABSENT: COMMISSIONERS: none ATTEST: APPROVED: /s/Gary Chao /s/Paul Bro�hy Gary Chao, Assistant Director Paul Brophy, Chair Community Development Department Planning Commission TR-2014-42 CITY OF CUPERTINO 10300 Torre Avenue Cupertino, California 95014 RESOLUTION NO. 6769 OF THE PLANNING COMMISSION OF THE CITY OF CUPERTINO APPROVING THE REMOVAL OF T'HREE PROTECTED T'REES: A 17.7"/16.8", 26.6" AND 23.1" DIAMETER COAST LIVE OAKS IN CONJUNCTION WITH THE DEVELOPMENT OF A SINGLE FAMILY HILLSIDE RESIDENCE AT 21730 RAINBOW DRIVE (APN: 366-37-007) SECTION I: PROJECT DESCRIPTION Application No.: TR-2014-42 Applicant: Daryl Harris Property Owner: Jonathan Yao&Cathy Li Location: 21730 Rainbow Drive(APN: 366-37-007) SECTION II: FINDINGS FOR TREE REMOVAL WHEREAS, the Planning Commission of the City of Cupertino received an application for tree removal, as described in Section I of this Resolution; and WHEREAS, the necessary public notices have been given in accordance with the Procedural Ordinance of the City of Cupertino, and the Planning Commission has held at least one public hearing on this matter; and WHEREAS, the Planning Commission finds the following with regard to this application: 1. That the location of the trees restricts the economic enjoyment of the property by severely limiting the use of property in a manner not typically experienced by owners of similarly zoned and situated property, and the applicant has demonstrated to the satisfaction of the approval authority that there are no reasonable altematives to preserve the tree(s). NOW, THEREFORE, BE IT RESOLVED: That after careful consideration of the maps, facts, exhibits, testimony and other evidence submitted in this matter, subject to the conditions which are enumerated in this Resolution beginning on page 2 thereof,: The application for a Tree Removal Permit, Application No. TR-2014-42, is hereby approved, and that the subconclusions upon which the findings and conditions specified in this Resolution are based and contained in the Public Hearing record concerning Application no. TR-2014-42 as set forth in the Minutes of Planning Commission Meeting of November 25, 2014, and are incorporated by reference as though fully set forth herein. SECTION III: CONDITIONS ADMINISTERED BY THE COMMUNITY DEVELOPMENT DEPT. 1. APPROVED EXHIBITS Approval is based on the arborist report titled: "A Review of Proposed Construction/ 21730 Rainbow Drive/ APN 366-37-007/ Cupertino, California" dated October 16 and 28, 2014, consisting of 6 pages, prepared by Michael L. Bench, Consulting Arborist, except as may be amended by conditions in this resolution. Trees approved for removal are depicted on the Tree Map Site Plan prepared by Michael L. Bench and numbered on the map: 6, 30, and 33. In the course of construction activities, the applicant Resolution No.6769 TR-2014-42 November 25,2014 shall attempt to protect trees numbered 6 and 30. Should those attempts fail and the oaks decline from the damage, the applicant retains the right to remove and replace those oaks. 2. CONCURRENT APPROVAL CONDITIONS The conditions of approval contained in file no. EXC-2014-09 shall be applicable to this approval. 3. TREE REPLACEMENT For each of the oaks referenced above approved for removal, the applicant shall plant two 24-inch box Coast Live Oaks. Replacement locations shall be approved by the Community Development Director with the primary objective to screen the front retaining walls from public street views and secondarily, views of the proposed trail from the proposed residence. 4. TREE PROTECTION Prior to building permit issuance, the development plans shall be revised to the satisfaction of the Director of Community Development to create greater buffering distance between the protected trees along the driveway and residential improvements. This should include a slight realignment of the driveway to better protect upslope oaks, and the siting of storm flow lines and other constructed drainage features to avoid the canopy driplines of the protect oaks. Tree protection fencing shall be erected to protect oaks slated for protection from construction activities. T'he tree protection measures shall be placed in the construction plan set. A report ascertaining the good health of the trees mentioned above shall be provided prior to issuance of final occupancy. 5. NOTICE OF FEES DEDICATIONS, RESERVATIONS OR OTHER EXACTIONS The Conditions of Project Approval set forth herein may include certain fees, dedication requirements, reservation requirements, and other exactions. Pursuant to Government Code Section 66020(d) (1), these Conditions constitute written notice of a statement of the amount of such fees, and a description of the dedications, reservations, and other exactions. You are hereby further notified that the 90-day approval period in which you may protest these fees, dedications, reservations, and other exactions, pursuant to Government Code Section 66020(a), has begun. If you fail to file a protest within this 90- day period complying with all of the requirements of Section 66020, you will be legally barred from later challenging such exactions. 6. PERMIT EXPIRATION The subject tree removal permit approval shall expire two (2) years from the date of approval if not used. Resolution No. 6769 TR-2014-42 November 25,2014 PASSED AND ADOPTED this 25th day of November 2014, at a Regular Meeting of the Planning Commission of the City of Cupertino, State of California,by the following roll call vote: AYES: COMMISSIONERS: Chair Brophy, Vice Chair Lee, Gong, Sun, Takahashi NOES: COMMISSIONERS: none ABSTAIN: COMMISSIONERS: none ABSENT: COMMISSIONERS: none ATTEST: APPROVED: /s/Gary Chao /s/Paul Bro�hy Gary Chao, Assistant Director Paul Brophy, Chair Community Development Dept. 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O7 tg" NADE CONCRETE GUTiER-SEE DETAIL ; s-'':� DATE: 9-29-2014 CONNECT TO CLEANOUT AT PROPERTY IJNE. °-�� - "'� O3 DIRECT ROOF DON?JSPOUT LEADERS TO APPROVED O INSTALL 4"�SCHEDULE 40 PVC PERFORATED BACKDRAINS(W/HOLES DOWN)- EARTHWORB QUANTITY SPLASH BLOCKS(2'LENGTH MIN.). DIRECT AWAY SLOPE 1.5X MIN. RETAINING WALLS AND POOL ARE NOT INCIUDED SCALE: 1�= 10� FROM BUILDING FOR POSITIVE FLOW,dc TOWARDS $ARTH�PORg NOTE: PERVIOUS AREA OF THE SITE-TYP.(SEE DETAIL) CONTRA TO SHALL ICTLY ADHERE TO THE APPROXIMATE CUT REQUIRED DRAWN BY: NR O4 APPROXIMATE LOCATION OF JOINT 1RENCH TRENCH 10 (2)36�PERFORATED HDPE PIPE LAID FLAT- TYP. SOILS ENGINEER'S RECOMMENDATiONS ON STRIPPING WITHIN BUIIDING FOOTPRINT 552f CY NOTE AND SITE PREPARAl10N FOR ALL PERTINENT APPROXIMATE CUT REQUIRED SHEET NO: INCLUDES• GRADING.PAVING AND TRENCH BACKFlLL ON THIS p�T$�DE BUILDING FOOTPRINT 1638t CY ALL GASJELECTRIC UNES,COMMUNICATIONS LINES 11 6'SCH. 40 OVERFLOW PVC O S=0.5x. SITE. APPROXIMATE FlLL REOUIRED AND APPURTENANCES, INCLUDING ALL PUBLJC UTIUTY, NOTES WITHiN BUILDING FOOTPRINT Ot CY C�� CAN AND TELEGRAPH SYSlEMS, SHALL BE LOCATED 12 (N)INFlLTRATION DEVICE(CHRISTY v-24)w/eorroM. TOPOGRAPHIC AND BOUNDARY INFORMATION SHOWN HEREON AND INSTALLED UNDERGROUNO. THE QUANTlT1ES ARE SHOWN FOR THE PURPOSE OF APPROXIMATE FlLL REOUIRED (N)ON-SITE RETENTION SYSTEM(10'X30')TO METER STORM WATER DRAINAGE. WAS SUPP�IED BY THE OWNER FOR THE USE OF NNR ENGINEERING. CUPERTINO AND ARE NOT TO BE USED fOR WTSIDE BUILDING FOOTPRINT SSf CY O 6�SCH. 40 PVC O S=1X MIN. 73 PAYMENT TO THE CONTRACTOR. CONTRACTOR SHALL SEE DETAIL. ESTABLJSH HIS OWN QUANTITIES. EXPORT 2245t CY OF 5 SHEETS �oo 690 CONC. GU TTER Q SEE DETAIL 6gO 4" PERFORATED SCH 40 PVC PIPE � �� S=1%MIN. 670 660 650 %VV 690 680 670 660 650 700 690 680 670 660 650 CARPORT OR/VEWAY RETAINING WALL �SEE STRUCTURAL PLANS-TYP. _ STD 6"CURB-TYP. F!NISH GRADE� RETAINING WALL SEE STRUCTURA PLANS-TYP. A-A SCALE H 1"=10 V 1°=10' EXlST/NG GRADE B-B SCALE: H l"=f 0' V 1"=10' C-C SCALE.• H 1"=10' V 1"=10' 680 670 Z � � W 660 650 645 1+00 680 14' WIDE CONC. RIVEWAY 6"�O GUTTE F.G. SEE DETAIL EXlST1NG GRADE RETAINING WALL 660 4�� SEE STRUCTURAL PERFORATED PLANS-TYP. SCH 40 PVC PIPE � ��n S=1.�MIN. D-D SCALE: N 1'"=f0' V 1"=f0" �, _ _ __ `O - — — w SOLID PIPEJ SLOPED TO DRAI PRO�IDE T/E DOWN SEE SD END RESTRA/NT DETAIL EX/ST/NG GRADE F/NlSH GRADE-. �- �� n N^ � �� 'J +� W SEE SOIL REPORT FOR STRUCTURAL SECTION _ .77� :�sl�- �-� ., ��/�f�� "V; . ,r.�'e� r _ ... _., .. i � , .,:� `• r.' . .��f.'��. , / � �I�� . . .,, .,..._..�...�.,��.d,� � 4. ��{ ay�, Y_.. .�i. �...♦.� .—�.�,.....a . .LY .�D � � W GARAGE DW PROFILE �� SCALE: H 1"=10' v �"=�o' PROIiIDE AGRI ORA/N RAT GUARD PROVIDE TlE DOWN SEE SD RG08"' OR S/MILAR AT OUTLET. END RESTRAINT DETAIL PROVIOE "10' LONG T" �END OF PIPE 2 _�' 6" TO 12" �ROCK � 12"' THICK KEWA Y \ F1L TER FABRIC EXTENDED �\� ' SLOPE PRO/TECTION. �,✓, J`l�' ��/�%��'S� �/'`�,�/\/\. ��%�;�`�`��'a'�/ .. 6"� DISCHARGE PIPE M�N �;,j\o\�'��\ ,/ /�j��\�/v\\/ 2 10' /�/\��/�� TNE INTENT OF AN ENERGY DISSIPATOR lS TO DISPERSE TH£ COLLECTED DRAINAGE AS "SHEET FLOW" ONTO THE EXISTING GROUND SURFACE, WHICH SlMULATES THE DRAINAGE CONDlTIONS THAT WOULD OTHERWlSE NOTE.• ENDS OF SURFACE DRAINAGE OISCHARGE NATURALLY OCCUR lF NO DE�ELOPMENT WERE PRESENrS ON THE SITE. PIPE SHOULD NOT BE CAPPED. PERIODIC MA/NTENANCE lS REQUIRED TO KEEP DISCHARGE FREE FROM BLOCKAGE. E�RGY DISSIPATOR DETAII. N.T.S. � REVISIONS I BY QRpFES510,yq y�Q4,P\�N.RqF�o��/y W= � ^ °C No.56027 A � ExP,12 31 1 4 � J�4r C � ��\? F OF CA�\F� V � � � s W A � „ ,� ,h �W U e�, � � � � V � ti `=' � z � � � � W N � � Fil � � W a � � A U a � O � O W � A W W � � c9�� U a � O N a a d a V w M � V ^ h�M DATE: 9-29-2014 SCALE: AS SHOWN DRAWN BY: NR sHEEr Na C-2 OF 1 SHEETS FINISH GRADE 3/4 " DRAIN ROCK WATER PROOFING MARAFI 140 FILTER FABRIC RETAINING WAL� FOR y� BASEMENT _ VAPOR BARRIER PER SOILS REPORT DISCHARGE LINE W/ BASEMENT FLOOR BACKFLOW PREVENTER- 18"X18"X24" DEEP r.RarF CHRISTY BOX W/ BOTTOM z PER�SOILS REPORTMATERIAL ' � �: � MIN. 4" SCHEDULE 40 OR SDR 35 (OR 2�-3" DRAIN ROC > ��,` N .�:�'tr,�'S.:: EQUIVALENT) PVC PERFORATED PIPE s=r r� (PERFORATION FACING DOWN) RESTING ON A THW LAYER OF CRUSHED ROCK, MIN. DEPTH PER SOILS REPORT, DRAIN AT 1� MIN. BASEMENT RETAINIlVG�VALL DRAINAGE INFILTRATION DEVICE DETAIL ACCESS COVER TO CATCH BASIN N.T.S. N.T.S. CLEANOUT SYSTEM (CHRISTY V-24) OR EQUAL GRATE FINISH GRADE GRATE COVER (N) CATCH BASIN (CHRISTY V-24) - --'-- i z OR EQUAL WITHOUT BOTTOM � � 24" EARTH CAP (MIN.) � �o O � � OUTFLOW o PIPE �'�. = FINISH GRADE � Q 3/4" DRAIN ROCK BEDDING N z (N) 2' CONCRETE LINED v � DITCH (5" DEEP) ai? M_� `� � � - - --- RETAINING WALL DRILL 2" HOLE AT BOTTOM FOR WATER TO DRAIN CONC.GUTrER TYPICAL SECTION 2"-3" DRAIN ROCK N.T.S. CATCH BASIN DETAII. N.T.S. PROVIDE CLEANOUTS AS SHOWN FOR FLUSHING OF SYSTEM COTG II � 36" PERFORATED HDPE PIPE 8" TO 36" REDUCER F- —� 36" PERFORATED HDPE PIPE � Y (N) CATCH BASIN (CHRISTY V-24) OR EQUAL WITHOUT BOTTOM SEE PLAN PLAN VIE�V (2) BANKED �36" PERFORATED HDPE PIPE LAID FLAT- TYP. >.;., :�-..,_ • • _ _, - _ . � �'_s��_y��% ' 1, 4 ' ��:-��a�:�`�� G'o�l "�� ,.0 .�:� � /"_:' .-.,�:!„�i:L'±w;' y �: � t�'R_.,�,�,? �,.��; ,,,j,< �P�Si`X,,: �/��'° .�. •.�, / t. , ..y..r. .�.:�:.�.� . t,;_; � � , � , 4,�-�'.i�,si�:.�i�a�E:: - --. .. .. � t ��, � � i r' - ;`: �, ';�'�'V- ,,�'��` , A 12"-24" EARTH CAP 6" PVC EMERGENCY OVERFLOW �0.5� MIN. PIPE IN E-- - SEE PLAN -- — ----------�j 3 I M � \�;��.�;\��'`..,\ '.` �� ;\��,��,,\�� RETENTION/DISSIPATOR STRUCTURE N. . . REVISIONS BY 3 O J Z (N) CATCH BASI �oQROFNS�Nq�� CHRISTY V-24 ti=Pp�� AFFOI�� OR EQUAL � A No.56027 �` E,p.12 31 14 '� �4l � � ��Q f OF CA��E� � F—INFLOW COTG � � � � s 3/4" DRAIN ROCK � � � i� `� WRAPPED IN FILTER FABRIC � � � � � � � � jM� o � � v � ti (N) CATCH BASIN � d [�7 � "-(CHRISTY V-24) w � y n �" OR EQUAL � � �—INFLOW � �RAIN ROCK .�._, =D IN FILTER FABRIC a -8" IN THICKNESS Q A U a � 0 � � W �i A W W � � � V a � O N a a (2) BANKED 36" PERFORATED HDPE PIPE LAID FLAT— TYP. � �� ;. '�.i.�. � � ��. �-� �� =�� 10' MIN. SECTION A'A BACKFILL PER GEOTECHNICAL N.T.S. ENGINEER'S RECOMMENDATIONS z � � � U W w � A � � v� � U 0 � U DATE: 9-29-2014 SCALE: AS SHOWIJ DRAWN BY: NR SHEET N0: C-3 OF S SHEETS I % � ' I / / / / � / I � f j / I � _ / t '� I / / � / / �� / PRIVATE ACCESS �� / EASEMENT P.U.E. 1; / S.S.S.E. / , � ! / R=183.72 — �- i � '-"L=63•� / , � ,.. f ! ..-��.�.._.-.__ �� _ � � '-� /'. � � '—�—�-- ---__ _ / i `' - -- .= / os' � / !` � / . 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EXPORT 2245t CY DATE: 9-29-2014 SCALE: 1'= 10' DRAWN BY: NR SHEET N0: C-4 OF S SHEETS � ��__�-_-�-° f � �-,�_�, _ � __----r —__ ` � �� ,�,s,, � � _ � � i � �� / ! �— � ,, j - /� r - //// ; ./�j/ . • i..ii � / ' � ``'–�..�__�---�'`...-. // // ., // / r� / .. / /////// '///// / / // // .�'"�u;; / �.,—.._ __._ � I /// / S -�" � ------ _ � ,�;'��/'; ///�� ;//�/ ' � � � �__._--, ,_ / ;','' ///. //� / �j_ /� � �— � __---- _ / ! /� /�, /� �!- _ _- � ; i ;� :-% ,,,,,. // /// ;�;.// ////, ; / // - // / � , N �F�� ,/� �� / �- /� i/ /.� / , �, i /� r ��-- -_ ___ ____- ///� ��`��/ /�� //� ,, / //./ � ; : , , ; � J,�-- ! _._ :' ' ; -'�� _ /� / �j/� �� / //�j//�;�; //�j/� / / / / / / ij � ; �� -------� -- . // / / � :;�, / , � / / / / / ,: �� / ,�/ � / ,� -'�� -�� ' /� �� / ; �� /�� /�� /�� . % ,,� -- / /// // / �, ,// // ///..,,//// , ,. /,, , j:� — za� �/��/��i/�/�� ; �/� //,//� // � / , �/ %� // /; / / i� �' 6E� _ � IMPER �/�-, . � /- ,//� ,. ; , / �- � � � __�_ /, VIOUS , �� / , , ,r/ , , , � ---- /� AREA=9 8 � �� / �'�� '' '// �. / , _. / � ,---- / ,, , 77 S.F.// ///// / �° / / �,i �� /� __.__------- // ,� � ,, , // // // / . � � �. _ � �� /� �� /� �� ,r , /// / // / /// // // // // // /// // // =_'i /////�j //// . / ,� /////// ////.// . / ///// /// / --�- / ��C� / / / i �� %�� /CONC.D�V�� /� /��j/� � ��j�� /� �� .. // /_,,..- / � /� / / // . /./� � //� /� � //� /� / /� / �,° .' , � �� r�f �� :�� .� . � i� � � � i� i� � ii� � / � , i /. ��' - ��,�� - �: , // , . _ _ _ _ ____ r / �// � / / �, ;,. / , , o ___ ,� / / // �.--'� , ! ,. 12?REc' 6�OAK,o // ��/�/ ,/� / --i /// � .,�;� ,�-- // �.- ,.. ,/ � _ �:. ;� - - . � . , ,� � ,,,,. , � � : . _ ; , �, , , / o i . . � ; y4„ _ -_. _ _ . � . �� --`_ _ t � � � ' j �� / ' f � / ' :---_ ___--- ��~ � : �..- ;. 1 % ! /,�%-� /, jl �` � � / i�� j' , ; � ; . ,, l. ;. , � � t September 29,2014 ,,..-��/ ,�� ,:/ ,,.-'� ,/ � 1` 11 ,� —, �ti� — �l APN:366-37-007 21730 Rainbow Drive Cupertino.Santa Clarx Countt.CA. Post-Devdonment Total On-Site Impen�ious Area=9,8'77 sq.ft.=0.226 acr� C�FV=0.95 C�;��=0.30 Change in the Run-0ff Coe�cient=U.95-03U=U.65 I=0.56 in/hr. C=0.65 A=0.226 acre Q=CIA=0.6ia�0.56x0.226=0.08 cfs Determine storage/deteMion volume:V=Q x 2x tc CO[ISIIlIC[lOD Il1Il0�Y0IUIIIC V�0.08 x 2 x 60�►nd/minutc.w a 60�nd/minute.r=576 cf Retention system sizing calculation5 Pipe diameter=3G°perforated Pipe length=30' Pipe area=3.ISx(3)2/d=7.1 sq.ft. Storage volume of pipe-=7.1x30=213 cf. Constnict(2}36"perforated pip�426 cf Trench caoacit�' Width=8' L.ength=30' Depth=2.5' Trench volume=2.Sx8x30=600 cf Trench only has 30%or less storage capacity(30%��oid rauo) 600s0.3=180 Storage��olume required=576 cf Storage nroaosed=426+180=606 cf � - ... �.r,.; �Tl��-�I�"'�� , A`:��r'li3.,i�!/�5��.�.��-r,'..��:.e�:.�.ac�� - k' -�:-�.:ct: i? � , //—�5/� .,..,...�,..��...,.,..�...�. ..:t � v E` .. . • _,..�.,�...�..�` � 4' � I � I � I I REVISIONS I BY QROFESSIOpq ��=P��N.RqF olyc� � No.56027 � � ExP,12 31 14 # �qT � � ��P f 0� CA��EO � � � w � � z W � z z � O W W A W � a � � a � � � s A � � W � � � � � � W � � � � � �- � � � � M � � Q � M � � N � z � O � � � 0 � � a � W AU � DATE: 9-29-2014 ; SCALE: 1'= 10' ,� �; DRAWN 8Y: NR _� 'y ' SHEET N0: + U � � a � U C-5 OF S SHEETS , � '� � �/ -- —_ '�I I � �I � / / / / ��' � ' - / � � � I / �� \� � �� PRI VATE ACCESS / �� "'�' \� EASEMENT P.U.E. � \ � S.S.S.E. / I �� / �� — — � � �� a I'�� REVISIONS I BY _�- �- � o �� e? ,. �\ ;...� :, / I ''�o �r► � QROFESSION4 I \�' G � �,.� �,� `� .� �E,� N.Rq�-�f CONSTRUCT TEMPORARY COVERED __�_�- / �� G� � � \ `� ` � � � AREA 8'x10' OR LARGER F�R STORING � �� O��NPG��P��' �i� ��e� ��'�' �� I �=P�� FG<� /� \ � No.56027 A CEMENT, PAINTS, FLAMABLES, OILS, / / ♦� P O�S�� I � ,2 3, ,a � -� FERTILIZERS PESTiCIDE, OR ANY OTHER � E%P �� - �-- �" �` `iP' ♦� �� 1� �ar c �p // � M ATERi Al_,S_._TI�+� V�tt.t P�€N�t-�Y '�'� �♦ ��♦ � a\ �—____—� _ �� f oF cn��E°`� i �BECOME A POLLUTANT. �� i G ' � �� .�. �� 1``�� r �� R �' '� _�•r � ..l� "''�---..._.... 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THE Q ��M/N.6'(75o mmf THlCK O��4� (3.6M) BINDING VIRE ^ �'`1� DETAIL ADJACENT PUBLIC RIGHT-OF-WAY SHALL BE KEPT CLEAR OF ALL JOB � � �O � o o OQ� ROUGH WOODEN FRAME O h/��1� v IN FLAT AREA RELATED OIRT AND DEBRIS AT iHE END OF THE DAY. FAILURE TO MAINTAIN �O � 000 � p � ~ h+1 THE PUBLIC RIGHT-OF-WAY ACCORDING TO THIS CONDITION AIAY RESULT IN � � O STORM Mb1TER INLET gySWA7ERSSWEEPDRRSAM INSERiS STACKED HAY BALES C2> � STRAW WATTLES THE TOWN PERfORMING THE REWIRED MAINTENANCE AT iHE DEVELOPER'S (9i6-33<-�+a3) O NTS EXPENSE. Div£R.vav R�ocf COVER CRATE W/F�TER FABPoC -- STOCKPILE COVER FABRiC —� - -�- � SECURE�ABRIC VITH STAPLES, NATNE MATERIAL OVERLAP fABRIC 2'TYPICAL ROCK BAGS,OR SIMILAR WEfGHT DEVICE SEQUENCE OF CONSTRUCTION 50� IS M M1N. � WEIGHT 1N CORNER -------�-------� ^-�-�------ ROPE 1. INSTALL STABILIZED CONSTRUCTION ENTRANCE. �— ! _ ��! DATE• 9-29-2014 BURLAP BAGS FlLLED WITFi GRMED ROCK D/tERS/ON R/OGf RfOU/RED (NO FiHES).NO SMALLER TWJ:1/2'IN S�ZE; vEDGE LO�SE STRA 2. CONSiRUCT AND MAITAIN TEMPORARY CHAIN LINK FENCE AT TNE SIiE PERIAIETER. SURROUr+D DRNN iN�Er a.l FouR S�DES BETwEEN BnILS 0 � STACKED HAY BnLES WHERE GRADf EXCE£DS 2X 3. CONSTRUCT FlBER ROLLS ON THE SIiE PERIAIETER. p�pR CREnTER NOiES: 1.THICKNESS OF FlLL£D BACS WHEN WD SHALL NOT 12 MI�PLAST]C LININC SCALE: i�= �O� a 4. PROVIDE WATER ON SIlE FOR DUST CONTROL DURING ALl GRADING OPERATIONS. RoADwq y EXCEED!'. -- - 5. CIEAR AND GRUB THE SITE. Z.ENSURE n+ERE u+E r+o c�ws eErnE[N n+E encs. A DRAYYN BY: NR 6. BEGIN GRADING iHE SiTE. -farER rneR�c 3.REMOVE ACCUAIVU7ED SILT,AND DEBRIS BEFORE fT EXCEEDS 2'THICK ON TFff SIDES � 7. INSTA�L CHECK DAMS,SEDIMENT TRAPS AND SECTION A-A 1.INSPECT WIET PROTECTION DAILY WRINC EXIENpED RNNFALL wEIGr+T IN CORNER SHEET N0: CREATE TEMP�RARY EARTH PERIODS PND BEFORE AND PFfER FACH RA1N EVENT. � � REUSABLE ROUGH WOODEN FRAME SvaLE T❑DIR�CT RaW-warER BASINS,TEMPORARY SWALES. STABILIZED CONSTRUCTION EN�TRANCE AWAY FR�M PII.E ' C-6 8. COMPLETE GRADING AND INSiAIL PERMANENT SEEDING AND PLANTING. NTS BURLAP SACK DRAIN INLET(D.I.) TEMPORARY COVER ON STOCK PILE 9. REIAOVE ALL TEMPORARY EROSION AND SEDIMENT CONTROL DEVICES STABILIZED CONSTRUCTION ENTRANCE NOTES: TEMPORARY CONCRETE WASHOUT FACILITY ABOVE GRADE Nrs (oN�r iF sirE is srAeiuzEO>. N SEDIMENT FILTER DETAIL � Nrs � NTS OF 6 SHEETS