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a.. x L&M Group -2- 31 August 2020 <br /> Water Boards "'"'°'"`""""a"" Feel free to contact me with any questions or concerns regarding this letter at <br /> (916)464-4622 or Bill.Brattain(o�waterboards.ca.aov. <br /> Central Valley Regional Water Quality Control Board <br /> 31 August 2020 Q813112020 <br /> William Brattain, P.E.Water Resource Control EngineerPrivate Sites Cleanup UnitChevron Environmental Management Companyand Phillips 66(L&M Group)c/o Glenn LeongTrihydro Corporation Steven W.Meeks, P.E.2520 Stanwell Drive, Suite 105 Senior Water Resource Control Engineer <br /> Concord, CA W20 Chief, Private Sites Cleanup Unit <br /> CONCURRENCE WITH WORK PLAN FOR REPLACEMENT OF SOIL VAPOR WELL cc: Timothy Bishop, Chevron Environmental Management Company, San Ramon <br /> APSVS/10,L&M OPERABLE UNIT,STOCKTON, SAN JOAQUIN COUNTY Eli Gurian, Phillips 66, Long Beach <br /> Central Valley Water Board staff has reviewed the 25 August 2020 Work Plan Soil Vapor <br /> Well APSV-9110 Replacement(work plan)prepared by Trihydro Corporation(Trihydro)on <br /> behalf of Chevron Environmental Management Company and Phillips 66(L&M Group)for <br /> the L&M Operable Unit site in San Joaquin County. The work plan was submitted as <br /> discussed during our meeting with you on 16 January 2020. <br /> In the work plan,Trihydro proposes to destroy the existing nested soil vapor well <br /> APSV-9/10 due to damage to the well box and surrounding concrete and the observation <br /> of standing water and odorous soil in the well vault. A new nested well will be installed to <br /> replace ASPV-9/10 at a location within 10 feet of the existing well. The well materials for <br /> ASPV-9/10 will be removed and it will be abandoned in accordance with San Joaquin <br /> County Environmental Health Department requirements. <br /> The replacement well will consist of one 8-inch long soil vapor probe set at a depth of <br /> approximately 9 feet(APSV-9R)and a second vapor probe set at a depth of approximately <br /> 5 feet(APSV-1 OR). An installation summary report will be submitted following completion <br /> of the well replacement activities. Following completion of the well installation activities, <br /> soil vapor samples will be collected from the replacement wells on a semiannual basis. <br /> Central Valley Water Board staff concurs with the proposed work in the work plan. Please <br /> submit the proposed installation summary report by 20 November 2020. Please provide <br /> us with a minimum of 72 hours' notice prior to initiation of the field work so that we have an <br /> opportunity to observe the work. <br /> KARL E.LPNOLEY act.P.E.,CHAIR I PATRICK PHLUPA,Eso.,EXECUTIVE OFFICER <br /> nousunc OrjVq*M.w,whOCOM ..u.Reero I •+--K.OE=M9 KEV/MntMI..n.y <br />