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• • Eoaurvn G. BRown J. <br /> oxx.. RECEIVED Q) oov..rvan <br /> Mnnxaw RooRiouaz <br /> Water Boards <br /> - - BEC 21 2912 <br /> Central Valley Regional Water Quality Control Board A�HEptTH <br /> ENVIRONMENT <br /> pERMITISERVICES <br /> Ben Terry 20 December 2012 <br /> Chevron Environmental Management <br /> 6111 Bollinger Canyon Road, Rm. 3652 <br /> San Ramon, CA 94583 <br /> DOCUMENT REVIEW FOR COMMINGLED PLUME ACCOUNT CP0057 SITES AT <br /> 440 (TEXACO— SHELL, RB #390268)1441 (ARCO, RB #390657) /508 (CHEVRON, <br /> RB #390876) W. CHARTER WAY AND 1444 S. LINCOLN STREET, (COLUMBO/TOSCANA <br /> BAKERY, RB #390825) STOCKTON, SAN JOAQUIN COUNTY <br /> I reviewed the System Installation Activities Progress Report and Request for Extension <br /> (Report), received 19 December 2012 from Stantec, the lead consultant for the above sites. <br /> The Report provided a progress update towards completion of the installation of the full scale <br /> Soil Vapor Extraction (SVE) and Air Sparging (AS) system from 1 October 2012 through <br /> 19 December 2012 at the Chevron facility. Five (5) SVE wells (VE-2 through VE-6) and ten (10) <br /> AS wells (AS-3 through AS-12) were installed during October 2012. Building permits and the <br /> authority to construct number N-1122947 were issued on 9 November 2012 and <br /> 13 November 2012, respectively. Construction activities began 19 November 2012. <br /> Approximately 120' of trench was constructed from the wells to the remediation compound <br /> during November 2012 and December 2012, followed by SVE/AS piping installation. <br /> On 21 December 2012, Stantec will begin a holiday hiatus on construction activities, with <br /> approximately 60% of the trenching, piping, backfilling and pavement restoration completed. <br /> Delays have included rain that shut down the project for several days, damaged underground <br /> utilities, the need to hand dig the trenches for safety and flooding of the sealed trenches due to <br /> an extreme precipitation event. The system installation completion date is now estimated to be <br /> 1 February 2013. After installation is complete, the utilities will need to be hooked up, the SVE <br /> system will need to be source tested and laboratory results must confirm that acceptable <br /> operation parameters are present prior to startup of the SVE/AS system. Stantec requested an <br /> extension for submittal of the remediation startup report from 30 January 2013 to <br /> 15 March 2013. <br /> 1 concur to the change of remediation startup report due date to 15 March 2013. Please <br /> expedite the schedule where possible. If you have any questions, you can contact me at <br /> (9A6) 464-4615 or I can be reached by e-mail at Ibartonawaterboards.ca.gov. <br /> VAS <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> cc: See CP0057 Distribution List <br /> KARL E. LONGLEV SCD, P.E., CHAIR I PAMELA C. CHEEDON f.E., BCEE. EXECUTIVE OFFICER <br /> 11020 Sun Center Drlve#200.Rancho Cordova,CA 95670 1 vvwvv.wauarb0ad:JS.ca,gov/Centrale alley <br /> �a noccLco rnrcn <br />