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15070104CITY OF CUPERTINO BUILDING PERMIT BUILDING ADDRESS: 21762 COLUMBUS AVE CONTRACTOR: NOECON PERMIT NO: 15070104 OWNER'S NAME: CHAN KAI MING AND LENG CHIH-MEI TRU PO BOX 317 DATE ISSUED: 07/15/2015 OWN S PHONE: 4087270497 ALVISO, CA 95002 PHONE NO: (650) 630-5967 LICENSED CONTRACTOR'S DECLARATION JOB DESCRIPTION: RESIDENTIAL COMMERCIAL DEMO (E) 600 S.F. SWIMMING POOL (FOR 90 % p ,s i _3 � ? 4 COMPACTION PURPOSES) License Class Lic. # Date Contractor I her yaffir tensed under the provisions of Chapter 9 (commencing with Section 7000) of Division 3 of the Business & Professions Code and that my license is in full force and effect. I hereby affirm under penalty of perjury one of the following two declarations: I have and will maintain a certificate of consent to self -insure for Worker's Compensation, as provided for by Section 3700 of the Labor Code, for the performance of the work for which this permit is issued. Sq. Ft Floor Area: Valuation: $15500 I have and will maintain Worker's Compensation Insurance, as provided for by APN Number: 35618041.00 Occupancy Type: Section 3700 of the Labor Code, for the performance of the work for which this permit is issued. APPLICANT CERTIFICATION I certify that I have read this application and state that the above information is PERMIT EXPIRES IF WORK IS NOT STARTED correct. I agree to comply with all city and county ordinances and state laws relating WITHIN 180 DAYS OF PERMIT ISSUANCE OR to building construction, and hereby authorize representatives of this city to enter upon the above mentioned property for inspection purposes. (We) agree to save 180 DA.YS FROM LAST CALLED INSPE indemnify and keep harmless the City of Cupertino against liabilities, judgments, costs, and expenses which may accrue against said City in consequence of the�WA Issued by: Date: granting of this permit. Additi Wally, the applicant understands and will comply with all non -point sour u ti s pe ertino Municipal Code, Section 9.18. RE -ROOFS: Signature Date_77�1� J All roofs shall be inspected prior to any roofing material being installed. If a roof is installed without first obtaining an inspection, I agree to remove all new materials for inspection. ❑ OWNER -BUILDER DECLARATION Signature of Applicant: Date: I hereby affirm that I am exempt from the Contractor's License Law for one of the following two reasons: ALL ROOF COVERINGS TO BE CLASS "A" OR BETTER 1, as owner of the property, or my employees with wages as their sole compensation, will do the work, and the structure is not intended or offered for sale (Sec.7044, Business & Professions Code) I, as owner of the property, am exclusively contracting with licensed contractors to HAZARDOUS MATERIALS DISCLOSURE construct the project (Sec.7044, Business & Professions Code). I have read the hazardous materials requirements under Chapter 6.95 of the California Health & Safety Code, Sections 25505, 25533, and 25534. I will I hereby affirm under penalty of perjury one of the following three maintain compliance with the Cupertino Municipal Code, Chapter 9.12 and the declarations: Health & Safety Code, Section 25532(a) shou d I store or handle hazardous I have and will maintain a Certificate of Consent to self -insure for Worker's material. Additionally, should I use equipm t or devices which emit hazardous Compensation, as provided for by Section 3700 of the Labor Code, for the air contaminants as defined by the Bay Are it Quality Management District I performance of the work for which this permit is issued, will maintain compliance with the Cuperti unicip ode, Chapter 9.12 and I have and will maintain Worker's Compensation Insurance, as provided for by the Health & Safety Code, Sections5 25534. Section 3700 of the Labor Code, for the performance of the work for which this Owner or authorized agent: Date: permit is issued. I certify that in the performance of the work for which this permit is issued, I shall not employ any person in any manner so as to become subject to the Worker's CONSTRUCTION LENDING AGENCY Compensation laws of California. If, after making this certificate of exemption, I become subject to the Worker's Compensation provisions of the Labor Code, I must I hereby affirm that there is a construction lending agency for the performance of forthwith comply with such provisions or this permit shall be deemed revoked. work's for which this permit is issued (Sec. 3097, Civ C.) Lender's Name APPLICANT CERTIFICATION Lender's Address I certify that I have read this application and state that the above information is correct. I agree to comply with all city and county ordinances and state laws relating to building construction, and hereby authorize representatives of this city to enter upon the above mentioned property for inspection purposes. (We) agree to save ARCHITECT'S DECLARATION indemnify and keep harmless the City of Cupertino against liabilities, judgments, costs, and expenses which may accrue against said City in consequence of the I understand my plans shall be used as public records. granting of this permit. Additionally, the applicant understands and will comply with all non -point source regulations per the Cupertino Municipal Code, Section Licensed Professional 9.18. Signature Date CUPERTINO SWIMMING POOL / SPA PERMIT APPLICATION COMMUNITY DEVELOPMENT DEPARTMENT • BUILDING DIVISION 10300 TORRE AVENUE • CUPERTINO, CA 95014-3255 (408) 777-3228 • FAX (408) 777-3333 • buildingacupertino.org 4 a PROJECT ADDRESS 1 7 /�q /v G __7N4 of I� OWNER �tn / /) PHONE CIO -72� ^(,t / EMAIL C/I i (� Q• (OYY n� / STREET ADDRESS CITY, STATE, ZIP /I C w FAX Ion &j CONTACT NAMEE MAIL 1 1�D lOC�YI ✓L�i% . STREET ADDRESS CITY, STATE, ZI v/ 11 C1 TO d ^ FAX E] OWNER ElOWNER-BUILDER 1:1 OWNERAGENT ONTRACTOR ❑ CONTRACTOR AGENT ❑ ARCHITECT 11ENGINEER❑ DEVELOPER ❑ TENANT CONTRACTOR NAME / lie LICENSE NUMBER �j �q (7 LICENSE TYPE /I BUS. LIC # COMPANY NAME IVOG CO JV E-MAIL y�O y1�,/C!j>f�• I%G� FAX STREET ADDRESS I/J CITY, STATE, ZIP^ �Qa /�L /J /{ `( PHONE / b 7 7 O ` V ARCHITBCTIENGINEERNAME LICENSENUMBER BUS. LIC/ # COMPANY NAME E-MAIL FAX STREET ADDRESS CrI-Y, STATE, ZIP PHONE DESCRIPTION OF WORK USE OF SFD or Duplex ❑ Multi -Family TYPE MATERIAL TYPE (CODE) AREA (SQ. FT.) VALUATION (S) POOL STRUCTURE: ❑ Commercial POOIISPA MATERIAL TYPE CODES: SPA V - VINYL -LINED F - FIBERGLASS DEMOC]� j G - GUNITE P - PREFABRICATED TOTAL VALUATION: r :RECEIVED BY 1 By my signature below, I certify to each of the f lowing: a prope owner or authorized agent to act on the property owner's behalf. I have read this application and the information I have provided i c I e Description of Work and verify it is accurate. I agree to comply with all applicable local ordinances and state laws relating to building con o thori resentatives of Cupertino to enter the above -identified property inspection purposes. /for l / Signature of Applicant/Agent: Date: SUPPLEMENTAL M TION REQUIRED OFFICE USE ONLY PLAN CHECK TYI'E - ROUTING SLIP X11,ER-TIIE-COUNTER El BUILDINGDEPT Commercial or Multi -Family Buildings with Public Swimming Pools: _ Department of Environmental Health approval required. <: ❑ ISYFRESS ❑' PLANNING DEPT ❑ STANDARD ❑ PUBLICWORKS DEPT ❑ LARGE ❑ ENVIRONMENTAL HEALTH ❑ MAJOR ❑ SANITARY SEWER DISTRICT SwimPooUpp_2011.doc revised 03/16/11 '\=Z7_ CITY OF CUPERTINO ` FEF ESTIMATOR — BUILDING DIVISION ki,ADDRESS: 21762 Columbus Ave DATE: 07/15/2015 REVIEWED BY: Paul hlecIt 1's APN: 356 18 041 BP#: -VALUATION: $15,500 *PERMIT TYPE: Demolition Permit ' Mier f lee.)InsP. E3_L_ PRIMARY USE: Swimming Pool, Res. 1'lttnZb./<1lec7a.Ll;lc�c PENTAMATION PERMIT TYPE: 1 SFPOOLDE WORK S.f. Swimming Pool For 90 % Compaction Purposes) SCOPE �Demo(E)600 FEE ID # POOLS 1DEMOPRES NOTE: This estimate does not include fees due to other Departments (i.e. Planning, Public works, Fire, sanitary Sewer vistrtcy Smoot TL f 6 .0.,.1 n[ s6n and are an/v an estimate. Contact the Dept for addn'1 info. 11 LJl/LLL, GLL. . I[[Guc ccu u[c ✓uua.0 v.• ..... ...�...»..». FEE ITEMS (Fee Resolution 11-053 Eff. 7/U131 Xlech. Plan (:'heck Phunb. Plan Check Elec. Plan Check hlecIt 1's Plumb. Permit Fee Elec, Pernzit 1,ee� Other Allech. Insp. ?n'urr Plump mail ' Mier f lee.)InsP. E3_L_ 1'lttnZb./<1lec7a.Ll;lc�c NOTE: This estimate does not include fees due to other Departments (i.e. Planning, Public works, Fire, sanitary Sewer vistrtcy Smoot TL f 6 .0.,.1 n[ s6n and are an/v an estimate. Contact the Dept for addn'1 info. 11 LJl/LLL, GLL. . I[[Guc ccu u[c ✓uua.0 v.• ..... ...�...»..». FEE ITEMS (Fee Resolution 11-053 Eff. 7/U131 ... ... .. .....___ __. ____.____ FEE __ - QTY/FEE MISC ITEMS Plan Check Fee: Suppl..PC Fee 1'lttnZb./<1lec7a.Ll;lc�c Permit Fee: $329.00 Suppl. Insp. Fee:Q Reg. Q OT Q,0 hrs $0.00 1'1unib.IA7ech./Flee I'lunib.iMech./Elec Permit Fee: Construction Tax Administrative Fee: Work Without Permit? Advanced Planning Fees: i Travel Documentalion Fees: Strong; Motion Fee: 1BSEISMICR $2.02 Select an Administrative Item Bldg, Stds Commission Fee: IBCBSC $1.00 SUBTOTALS: $332.02 $0.00 TOTAL FEE: $332.02 Revised: 07/02/2015 fe'- L e n9 61&,,r j5 ave- CA9 5=_0 y COMMUNITY DEVELOPMENT DEPARTMENT BUILDING DIVISION - CUPERTINO APPROVED This set of plans and specifications MUST be kept at the job site during construction. It is unlawful to make any changes or alterations on same, or to deviate therefrom, without approval from the Building Official. . The stamping of this plan and specifications SHALL t`l^T be held to permit or to be an approval of the violat of a -,rovisions off any City Ordinance or State L�.. ,/any IU�I^1 DATE PERMIT NO. :J'5 104 CUPERTINO Building Depaftent JUL 15 2015 -;W1fl71n11?9 )POO/ 0/' 0 It -)t o yi I `,�� � � � � �" lin'{Y��Uv► y�ev �- 6VF4j vS E COPY h W ic%,75 .21162 84,mbu5 u� REVIEWED FOR CODE COMPLIANCE Reviewed By: Thad UVIM 07 e rv"Ovtd� .gym['^ !o (4. 1 I e SMOKE / CARBON MONOXIDE ALARMS OWNER CERTIFICATE OF COMPLIANCE COMMUNITY DEVELOPMENT DEPARTMENT • BUILDING DIVISION 10300 TORRE AVENUE • CUPERTINO, CA 95014-3255 (408) 777-3228 • FAX (408) 777-3333 • building(alcupertino.org Address PURPOSE This affidavit is a self -certification for the installation of all required Smoke and Carbon Monoxide Alarms for compliance with 2013 CRC Section R314, 2013 CBC Sections 420.6 and 907.2.11.2 where no interior access for inspections are required. GENERAL INFORMATION Existing single-family and multi -family dwellings shall be provided with Smoke Alarms and Carbon Monoxide alarms. When the valuation of additions, alterations, or repairs to existing dwelling units exceeds .M $1000.00, CRC Section R314 and CBC Sections 907.2.11.5 and 420.6 require that Smoke Alarms and/or Carbon Monoxide Alarms be installed in the following locations: AREA SMOKE ALARM CO ALARM Outside of each separate sleeping area in the immediate vicinity of the bedroom(s) X X On every level of a dwelling unit including basements X X Within each sleeping room X Carbon Monoxide alarms are not required in dwellings which do not contain fuel -burning appliances and that do not have an attached garage. Carbon monoxide alarms combined with smoke alarms shall comply with CBC Section 420.6 and shall be approved by the Office of the State Fire Marshal. Power Supply: In dwelling units with no commercial power supply, alarm(s) may be solely battery operated. In existing dwelling units, alarms are permitted to be solely battery operated where repairs or alterations do not result in the removal of wall and ceiling finishes or there is no access by means of attic, basement or crawl space. Refer to CRC Section R314 and CBC Sections 907.2.11.4 and 420.6.2. An electrical permit is required for alarms which must be connected to the building wiring. As owner of the above -referenced property, I hereby certify that the alarm(s) referenced above has/have been installed in accordance with the manufacturer's instructions and in compliance with the California Building and California Residential Codes. The alarms have been tested and are operational, as of the date signed below. i have read and agree to c /y with the terms and conditions of this statement Owner (or Owner Agent's) Name: h!... &vl- Signature ............. ........... .................................................................... Date:` Contra or Name J!Fate: !Date:LA-5k ©� Signature ............ Lic.# ....... ..,5�...�... ..�.�3..1.... v Smoke and CO form.doc revised 03/18/14 r CVPERTINO Owner Name WATER -CONSERVING PLUMBING FIXTURES OWNER CERTIFICATE OF COMPLIANCE COMMUNITY DEVELOPMENT DEPARTMENT • BUILDING DIVISION 10300 TORRE AVENUE • CUPERTINO, CA 95014-3255 -3228 •FAX (408) 777-3333 • building 0-cupertino.org Address 7,,1 PERMIT CANNOT BE FINALED AND COMPLETED UNTIL THIS CERTIFICATE HAS BEEN SIGNED AND RETURNED TO THE BUILDING DIVISION Please refer to the attached California Civil Code Sections 1101.1- 1101.8 which are part of this Certification form. 1. Is your real property a registered historical site? ❑ Yes Civil Code Sections 1101.1 through 1101.8 do not apply. Sign below and skip the rest of the form Owner' Signature: No Go to Question 2. 1 (- Date: -T(� 1 16 �� 2. Does your real property have a licensed plumber certifying that, due to the age or configuration of the property or its plumbing, installation of water -conserving plumbing fixtures is not technically feasible? ❑ Yes Civil Code Sections 1101.1 through 1101.8 do not apply. ❑ The licensed plumber's certification has been provided to the Building Division. Sign below and skip the rest of the form �( No Owner' Signature: Date: Go to 3. Question 3. Is water service permanently disconnected for your building? ❑ Yes Civil Code Sections 1101.1 through 1101.8 do not apply. Sign below and skip the rest of the form. /�g No Owner' Signature: Date: Go to Question 4. / 4. Is your real property built and available for use or occupancy on or before January 1, 1994? ❑ No My real property is built and available for use or occupancy after January 1, 1994. Civil Code Sections 1101.1 through 111001.8 do not apply. Sign below and skip the rest of the form. Owner' Signature: 1 �'"'ll c, Date: Yes My real property is built and available for use or occupancy on or before January1, 1994. Civil Code Sections 1101.1 through 1101.8 apply. Refer to the attached. My property is a single-family residential real property. See Civil Code Section 1101.4. On and after January 1, 2014, building alterations or improvements shall require all non-compliant plumbing fixtures to be replaced with water -conserving plumbing fixtures throughout the building. On or before January 1, 2017, all non-compliant plumbing fixtures shall be replaced with water -conserving plumbing fixtures (regardless of whether property undergoes alterations or improvements). ❑ My property is a multifamily residential real property. See Civil Code Section 1101.5. On and after January 1, 2014, specified building alterations or improvements shall require non- compliant plumbing fixtures to be replaced with water -conserving plumbing fixtures. On or before January 1, 2019, all non-compliant plumbing fixtures shall be replaced with water - conserving plumbing fixtures throughout the building (regardless of whether property undergoes alterations or improvements). ❑ My property is a commercial real property. See Civil Code Section 1101.5. On and after January 1, 2014, specified building alterations or improvements shall require non- compliant plumbing fixtures to be replaced with water -conserving plumbing fixtures. SB40 7 2015. doc revised 02/04/15 On or before January 1, 2019, all non-compliant plumbing fixtures shall be replaced with water- conserving plumbing fixtures throughout the building (regardless of whether property undergoes alterations or improvements). I/We, the owner(s) of this property, certify under penalty of perjury that non-compliant plumbing fixtures will be replaced prior to date specified above with water -conserving plumbing fixtures in accordance with Civil Code Sections 1101.1 through 1101.8, the current California Plumbing Code and California Green Building Standards Code, and manufacturer's installation requirements, and that the water -conserving pluinbixg fixtures comply with the requirements as indicated in the table below. Owner's (or Owner Agent's) Signature: I I ^, -) ( k _ Date: —f 13 ( r'�. I Upon completing and signing this Certificate, please return it to the Building Division in order to final your permit. 1. If the existing plumbing fixture water usage/flow rate is equal to or lower than the figure shown, it is not required to be upgraded. SB407 2015. doc revised 02/04/15 Non -Compliant Water -Conserving Plumbing Fixture Plumbing Fixture (Fixture Complying with Current Code Applicable to New Construction) Maximum Water Usage/Flow Rate Fixture Type Water Usage 2013 CPC Ch. 4 2013 CPC Ch. 4 2013 CPC Ch. 4 /Flow Rate 2013 CALGreen Div. 4.3 2013 CALGreen Div. 4.3 2013 CALGreen Div. 5.3 Single -Family Multi -Family Commercial Residential Residential Water Closets Exceed 1.6 Single flush toilets: 1.28 gallons/flush (Toilets) Gallons/flush Dual flush toilets: 1.28 gallons/flush effective flush volume (the composite, average flush volume of two reduced flushes and one full flush Urinals Exceed 1.0 0.5 gallons/flush Gallons/flush Showerheads Exceed 2.5 2.0 gallons per minute @ 80 psi. Also certified to the performance criteria of gallons per minute U.S. EPA WaterSense Specification for Showerheads (A hand-held shower is considered a showerhead.) For multiple showerheads serving one shower, the combined flow rate of all showerheads and/or other shower outlets controlled by a single valve shall not exceed 2.0 gallons per minute @ 80 psi, or the shower shall be designed to allow only one shower outlet to be in operation at a time. Faucets — Exceed 2.2 gallons Maximum 1.5 gallons per Within units: 0.5 gallons per minute @ 60 Lavatory per minute minute @ 60 psi; minimum Maximum 1.5 gallons psi Faucets 0.8 gallons per minute @ per minute @ 60 psi; 20 psi minimum 0.8 gallons per minute @ 20 psi In common and public use areas: 0.5 gallons per minute @ 60 psi 1.8 gallons per minute 60 psi Faucets — Exceed 2.2 gallons 1.8 gallons per minute @ 1.8 gallons per minute 1.8 gallons per minute @ 60 Kitchen per minute 60 psi @ 60 psi psi Faucets May temporarily increase May temporarily up to 2.2 gallons per increase up to 2.2 minute @ 60 psi, and must gallons per minute @ default to maximum 60 psi, and must 1.8 gallons per minute @ default to maximum 60 psi 1.8 gallons per minute Where faucets meeting @ 60 psi the above are unavailable, Where faucets meeting aerators or other means the above are may be used to achieve unavailable, aerators or reduction. other means may be used to achieve reduction. 1. If the existing plumbing fixture water usage/flow rate is equal to or lower than the figure shown, it is not required to be upgraded. SB407 2015. doc revised 02/04/15 I Material Testing Results for Pool Backfill Testing at 3 2 6 Columbus Ave, Cupertino, CA Prepared for NOECON LOW Yale Bertolucci, CQE Construction Quality Enterprises P.O. Box 627, Lakeport, California 95453 Report Date July 27, 2015 Yale Bertolucci, COE Construction Quality Enterprises P.O. Box 627, Lakeport, California 95453 July 27, 2015 Noe Gonzalez NOECON P.O. Box 317 Alviso, California 95002 RE: Pool Backfill Testing, 21726 Columbus Ave., Cupertino, CA Dear Mr. Gonzalez,, Enclosed you will find for your review the report on the max density/opt moisture determination and density test results, along with the invoice for the Pool Backfill Testing, 21726 Columbus Ave., Cupertino, CA. Please call me if you have any questions, wish to go over the data or require additional services.. I want to thank you for allowing us the opportunity of providing our services on your project. We appreciate your business and hope we have provided you with service that meet or exceeded your expectations. Respectfully Submitted, 0 ale, Pat 0 � U C' C, i Yale Bertolucci Owner/Senior Consultant Toll Free: 877-813-9181 Fax: 866-685-5488 I Yale Bertolucci, C Q E Construction Quality Enterprises Client: NOECON Date: July 27, 2015 Project: Pool Backfill Testing Project No.: CQE 072-010 Project Location: 21726 Columbus Ave. Cupertino, CA Testing performed in accordance with ASTM D6938 G ole,'RentobAcci Yale Bertolucci Owner/Senior Consultant Density Determination Test Moist. Dry Percent Test Date Elev. Test Location Cont. Dens. Comp. Curve 2015 #1 7/21 -5.0' 3'S & 24'W of S W House Corner 10.3 115.4 91 #1 #2 7/21 -4.0' 9'N & 18'W of S W House Corner 11.7 116.8 92 # 1 #3 7/22 -3.0' 6'S & 27'W of S W House Corner 13.4 114.0 90 #1 #4 7/22 -3.0' 9'N & 21' W of S W House Corner 10.6 122.4 97 #1 #5 7/22 -2.0' 21' N & 30'W of S W House Corner 13.1 114.5 90 #1 #6 7/22 -2.0' ITS & 18'W of S W House Corner 11.6 116.3 92 #1 #7 7/22 -1.0' 6'S & 30'W of S W House Corner 11.4 117.4 93 #1 #8 7/22 -1.0' 9'N & 21' W of S W House Corner 12.5 118.7 94 #1 Testing performed in accordance with ASTM D6938 G ole,'RentobAcci Yale Bertolucci Owner/Senior Consultant r Yale Bertolucci, CQE Construction Quality Enterprises Client: NOECON Date: July 27, 2015 Project: Pool Backfill Testing Project No.: CQE 072-010 Project Location: 21726 Columbus Ave., Cupertino, CA Maximum Density/optimum Moisture Determination Sample Material Description #1 Brown Sandy Silt W/Fine Gravel Testing performed in accordance with ASTM D 1557-07 B 012 -Rext0 hicci Yale Bertolucci Owner/Senior Consultant Max Dry Density Optimum Moisture 126.7 POOL DEMOLITION RECOMMENDATIONS PROPOSED POOL DEMOLITION 21762 COLUMBUS AVENUE CUPERTINO, CALIFORNIA Prepared for: NOECON GENERAL ENGINEERING Prepared by: GeoEngineering Consultants Ju1y 2015 GeoEngineering Consultants (GEC) 4125 Blackford Avenue, Suite 145 San Jose, CA 95117 Phone: 925-321-5550 Project No. 2015.0188 July 15, 2015 Mr. Noe Gonzalez NoeCon General Engineering Subject: Proposed Pool Demolition 21762 Columbus Avenue Cupertino, California Pool Demolition and Backfill Recommendations Dear Noe: In accordance with your authorization, GeoEngineering Consultants (GEC) is providing this pool demolition and backfill recommendation for the subject site. The accompanying recommendation letter presents our findings and conclusions based on our site visit. Our findings indicate that, from a geotechnical point of view, the proposed demolition and backfill is feasible at the subject site provided the recommendations of this report are carefully followed and are incorporated into the project plans. Should you have any questions relating to the contents of this letter report or should you require additional information, please do not hesitate to contact our office at your convenience. Sincerely yourF` t ;, GEC. N Not C fie. G, -663j9 Exp -3Z7, 92 na�Pi. KamranGhiassi, Ph.D., G.E. Principal Geotechnical Engineer Contents 1. INTRODUCTION............................................................................................................4 1.1. Purpose and Scope...................................................................................................4 1.2. Project Description...................................................................................................5 2. FINDINGS......................................................................................................................5 2.1. Site Description........................................................................................................5 3. RECOMMENDATIONS...................................................................................................5 3.1. General....................................................................................................................5 3.2. Demolition...............................................................................................................5 3.3. Backfill.....................................................................................................................6 APPENDIXA...........................................................................................................................7 THE GRADING SPECIFICATIONS.......................................................................................................8 GUIDE SPECIFICATIONS FOR ROCK UNDER FLOOR SLABS...............................................................13 P15.0188 21762 Columbus Ave., Cupertino July 15, 2015 1. INTRODUCTION This report summarizes our findings and conclusions for use in consideration of proposed pool demolition and backfill at the above -referenced address, based on our site visit and review of the City of Cupertino Guideline for Swimming Pool Demolition. 1.1. Purpose and Scope The purpose of the work was to provide pool demolition and backfill recommendations at the site located in Cupertino, California. Our scope of service included the following: a. Field reconnaissance by the Soil Engineer; b. Preparation of this written report. This report has been prepared as a product of our service for the exclusive use of NeoCon for the proposed pool demolition and backfill at the subject property. This report must not be used by other parties or for other purposes without prior written authorization from GEC. No other warranty, either expressed or implied, is made. Because of possible future changes in site conditions or the standards of practice for geotechnical engineering, the findings and recommendations of this report may not be considered valid beyond two years from the report date, without review by GEC. In addition, in the event that any changes in the nature or location of the proposed improvements are planned, the conclusions and recommendations of this report may not be considered valid unless such changes are reviewed, and the conclusions and recommendations presented in this report are modified or verified in writing, by this firm. GEC Page 4 -P15.0188 21762 Columbus Ave., Cupertino July 15, 2015 1.2. Project Description Based on our discussions with you, we understood that the existing pool will be completely demolished and will be backfilled. The existing pool is up to 6 feet deep. The minimum distance to the existing house footprint is about 5 feet. It is assumed that the area to be backfilled will not be a future building pad or structure, and thus, a geotechnical engineering study is not necessary. This report should not be used for future development in the area of the proposed pool backfill. 2. FINDINGS 2.1. Site Description The roughly trapezoidal -shaped parcel is located on a flat site at 21762 Columbus Avenue in Cupertino and is one parcel. The site is bounded by Columbus Avenue to the north and other residences to the other directions. There is an existing two-story wooden -frame house at the site. The backyard area has been landscaped. Wooden fences separate the residence from the adjacent neighbors. 3. RECOMMENDATIONS 3.1. General From a geotechnical point of view, the proposed pool demolition and backfill is feasible at the subject site provided the recommendations presented in this letter are incorporated into the project plans. 3.2. Demolition The Contractor should all the decking and swimming pool equipments, pool structure bond beam, slab and walls, electric conduit and gas lines should be removed. GEC Page 5 •P15.0188 21762 Columbus Ave., Cupertino July 15, 2015 3.3. Backfill The grading requirements presented herein are an integral part of the grading specifications presented in Appendix A of this report and should be considered as such. Grading activities during the rainy season will be hampered by excessive moisture. Grading activities may be performed during the rainy season, however, achieving proper compaction may be difficult due to excessive moisture; and delays may occur. After placement of the clean gravel, the site may be brought to the desired finished grades by placing engineered fill in lifts not to exceed 8 inches in uncompacted thickness and compacted to a minimum relative compaction of 90% at a moisture content of 2 to 5 percent above optimum as determined by ASTM D 1557-91 Laboratory Test Procedure. Should general import material be used to establish the proper grading for the proposed development, the import material should be approved by the Soil Engineer before it is brought to the site. General import material should preferably have an expansion potential similar to or less than the on site native soil. Selection of the import material is essential on rate of progress of the project. The following criteria are suggested a. Have an R -Value of not less than 25; b. Have a Plasticity Index not higher than 16 (see Foundation section); C. Not more than 15% passing the No. 200 sieve; d. No rocks larger than 6 inches in maximum size; GEC Page 6 APPENDIX A The Grading Specifications Guide Specifications for Rock Under Floor Slabs THE GRADING SPECIFICATIONS On 21762 COLUMBUS AVENUE CUPERTINO, CALIFORNIA 1. General Description 1.1 These specifications have been prepared for the grading and site development of the subject parking lot development. GEC, hereinafter described as the Soil Engineer, should be consulted prior to any site work connected with site development to ensure compliance with these specifications. 1.2 The Soil Engineer should be notified at least two working days prior to any site clearing or grading operations on the property in order to observe the stripping of organically contaminated material and to coordinate the work with the grading contractor in the field. 1.3 This item shall consist of all clearing or grubbing, preparation of land to be filled, filling of the land, spreading, compaction and control of fill, and all subsidiary work necessary to complete the grading of the filled areas to conform with the lines, grades, and slopes as shown on the accepted plans. The Soil Engineer is not responsible for determining line, grade elevations, or slope gradients. The property owner, or his representative, shall designate the person or organizations who will be responsible for these items of work. 1.4 The contents of these specifications shall be integrated with the soil report of which they are a part, therefore, they shall not be used as a self-contained document. 2. Tests The standard test used to define maximum densities of all compaction work shall be the ASTM D1557-91 Laboratory Test Procedure. All densities shall be expressed as a relative compaction in terms of the maximum dry density obtained in the laboratory by the foregoing standard procedure. 3. Clearing, Grubbing, and Preparing Areas To Be Filled 3.1 If encountered, all vegetable matter, trees, root systems, shrubs, debris, and organic topsoil shall be removed from all structural areas and areas to receive fill. 3.2 If encountered, any soil deemed soft or unsuitable by the Soil Engineer shall be removed. Any existing debris or excessively wet soils shall be excavated and removed as required by the Soil Engineer during grading. 3.3 All underground structures shall be removed from the site such as old foundations, abandoned pipe lines, septic tanks, and leach fields. 3.4 The final stripped excavation shall be approved by the Soil Engineer during construction and before further grading is started. 3.5 After the site has been cleared, stripped, excavated to the surface designated to receive fill, and scarified, it shall be bladed until it is uniform and free from large clods. The native subgrade soils shall be moisture conditioned and compacted to the requirements as specified in the grading section of this report. Fill can then be placed to provide the desired finished grades. The contractor shall obtain the Soil Engineer's approval of subgrade compaction before any fill is placed. 4. Materials 4.1 All fill material shall be approved by the Soil Engineer. The material shall be a soil or soil - rock mixture which is free from organic matter or other deleterious substances. The fill material shall not contain rocks or lumps over 6 inches in greatest dimension and not more than 15% larger than 2-1/2 inches. Materials from the site below the stripping depth are suitable for use in fills provided the above requirements are met. 4.2 Materials existing on the site are suitable for use as compacted engineered fill after the removal of all debris and organic material. All fill soils shall be approved by the Soil Engineer in the field. 4.3 Should import material be required, it must meet the specifications as delineated in the body of this report. 5. Placing, Spreadin" and Compacting Fill Material 5.1 The fill materials shall be placed in uniform lifts of not more than 8 inches in uncompacted thickness. Each layer shall be spread evenly and shall be thoroughly blade mixed during the spreading to obtain uniformity of material in each layer. Before compaction begins, the fill shall be brought to a water content that will permit proper compaction by either (a) aerating the material if it is too wet, or (b) spraying the material with water if it is too dry. 5.2 After each layer has been placed, mixed, and spread evenly, either import material or native material shall be compacted to a relative compaction designated for engineered fill. 5.3 Compaction shall be by footed rollers or other types of acceptable compacting rollers. Rollers shall be of such design that they will be able to compact the fill to the specified density. Rolling shall be accomplished while the fill material is within the specified moisture content range. Rolling of each layer shall be continuous over its entire area and the roller shall make sufficient trips to ensure that the required density has been obtained. No ponding or jetting shall be permitted. 5.4 Field density tests shall be made in each compacted layer by the Soil Engineer in accordance with Laboratory Test Procedure ASTM D1556-64 or D2922-71. When footed rollers are used for compaction, the density tests shall be taken in the compacted material below the surface disturbed by the roller. When these tests indicate that the compaction requirements on any layer of fill, or portion thereof, have not been met, the particular layer, or portion thereof, shall be reworked until the compaction requirements have been met. 5.5 No soil shall be placed or compacted during periods of rain nor on ground which contains free water. Soil which has been soaked and wetted by rain or any other cause shall not be compacted until completely drained and until the moisture content is within the limits hereinbefore described or approved by the Soil Engineer. Approval by the Soil Engineer shall be obtained prior to continuing the grading operations. 6. Utility Trench Backfill 6.1 The utility trenches extending under concrete slabs -on -grade shall be backfilled with native on-site soils or approved import materials and compacted to the requirements pertaining to the adjacent soil. No ponding or jetting will be permitted. 6.2 Utility trenches extending under all pavement areas shall be backfilled with native or approved import material and properly compacted to meet the requirements set forth by the City of Cupertino. 6.3 Where any opening is made under or through the perimeter foundations for such items as utility lines and trenches, the openings must be resealed so that they are watertight to prevent the possible entrance of outside irrigation or rain water into the underneath portion of the structures. 7. Unusual Conditions 7.1 In the event that any unusual conditions not covered by the special provisions are encountered during the grading operations, the Soil Engineer shall be immediately notified for additional recommendations. 8. General Requirements Dust Control 8.1 The contractor shall conduct all grading operations in such a manner as to preclude windblown dirt and dust and related damage to neighboring properties. The means of dust control shall be left to the discretion of the contractor and he shall assume liability for claims related to windblown material. GUIDE SPECIFICATIONS FOR ROCK UNDER FLOOR SLABS Definition Graded gravel or crushed rock for use under slabs -on -grade shall consist of a minimum thickness of mineral aggregate placed in accordance with these specifications and in conformance with the dimensions shown on the plans. The minimum thickness is specified in the accompanying report. Material The mineral aggregate shall consist of broken stone, crushed or uncrushed gravel, quarry waste, or a combination thereof. The aggregate shall be free from deleterious substances. It shall be of such quality that the absorption of water in a saturated dry condition does not exceed 3% of the oven dry weight of the sample. Gradation The mineral aggregate shall be of such size that the percentage composition by dry weight, as determined by laboratory sieves (U.S. Sieves) will conform to the following gradation: Sieve Size Percentage Passing 3/4" 90-100 No. 4 25-40 No. 8 18-33 No. 200 0-3 Placing Subgrade, upon which gravel or crushed rock is to be placed, shall be prepared as outlined in the accompanying soil