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07 <br /> Water Boards -" <br /> Central Valley Regional Water Quality Control Hoard <br /> 31 January 2020 <br /> Dana Parry <br /> Reynolds & Brown <br /> 1200 Concord Ave, Suite 200 <br /> Concord, CA W20 <br /> CONFIRMATION SAMPLING WORK PLAN CONDITIONAL CONCURRENCE AND <br /> CLOSURE SCHEDULE, POWER PILKINGTON NORTH AMERICA INC, 800 EAST <br /> LOUISE AVENUE, LATHROP, DIESEL SITE ON APN 198-080 000, SAN JOAQUIN <br /> COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (CVRWQCB) have <br /> reviewed the 18 December 2019 Confirmation Soil Sampling Work Plan (Work Plan) far <br /> the Former Pilkingbm North America diesel she located at 500 East Louise Ave in <br /> Lathrop, San Joaquin County (Site), submitted on your behalf by AdvancedGeo <br /> Environmental (AGE). The Work Plan was resubmitted to address comments provided <br /> by CVRWQCB in its Comments par the Con(umalion Sampling Work Plan letter dated 4 <br /> November 2019. <br /> The proposed scope of work includes the advancement of bur soil borings to collect soil <br /> samples near the diesel recovery wells to compare to historical elevated diesel range <br /> total petroleum hydrocarbons (TPHA concentrations in soil and four addi icnal borings <br /> to wheel soil and groundwater directly outside the demolished furnace building footprint <br /> where the sumps were located. A van-mounted Geoprobe 5400 direct-push drill HIS is <br /> planned for the advancement of borings. Groundwater sampling is proposed for <br /> samples selected from the near the former sump locations and soil samples will be <br /> collected fmm each of the eight borings. The soil borings are proposed to approximately <br /> 15-feet below ground surface (ft-bgs) with soil sample collection from discrete 5-foot <br /> Intervals. Sell samples will be sent to an accredited laboratory for analysis for TPH-d <br /> sing EPA method W15 and naphthalene, became, ethylbenzene analysis using EPA <br /> Method 8200B. Groundwater samples will be sent In an accredited Iabombry for <br /> analysis far dioxins and brans using EPA Method E1813 for samples collected from <br /> MWA and TPHd using EPA method 8015 for all groundwater samples. <br /> wle <br />