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Page 2 <br /> area of sidewall or surface area, and in areas of suspected <br /> contamination to verify the effectiveness of excavation <br /> activities . If excavation continues to groundwater then <br /> sidewall samples at the water interface will be collected, <br /> and a water sample will be collected. <br /> It is requested that a representative from San Joaquin <br /> County Public Health Department be on-site during excavation <br /> and sampling activities to address concerns regarding soil <br /> contamination that has been identified during both, recent <br /> tank removal and previous tank replacement activities . <br /> SoilLGroundwater Sampling and Analysis <br /> Soil samples will be collected in clean 6-inch-long brass <br /> tubes (2 inch diameter) , covered at both ends with teflon <br /> tape and sealed with plastic end caps . The soil samples will <br /> be labeled, entered on a Chain-of-Custody form, put in a <br /> cooler with frozen blue ice and transported to a State- <br /> certified analytical laboratory. The samples will be <br /> analyzed for Total Petroleum Hydrocarbons calculated as <br /> Gasoline according to EPA Method 8015 (Modified) and <br /> • Benzene, Toluene, Ethyl Benzene and Xylenes (BTEX) according <br /> to EPA Method 8020 . <br /> Excavated soils will be stockpiled on site and a soil <br /> stockpile sample will be collected for approximately every <br /> 25 cubic yards of excavated soil prior to covering with <br /> plastic . Four samples will then be composited in the <br /> laboratory for an analysis representative of approximately <br /> each 100 cubic yards of soil . Stockpile sampling will be for <br /> the purpose of characterizing soil for disposal at either v/ <br /> Forward Landfill located in Stockton, California or another <br /> appropriate facility. <br /> If groundwater samples are collected, a pre-cleaned <br /> stainless steel, teflon or PVC bailer may be used if the <br /> water depth is sufficient. Alternately, the grab sample will <br /> be collected in a laboratory supplied glass Sar . In either <br /> case the water samples will be carefully decanted into <br /> laboratory supplied VOA vials with no headspace. These will <br /> be labeled, entered on a Chain-of-Custody form and <br /> transported on ice to the State-certified analytical <br /> laboratory. Groundwater samples will be analyzed in <br /> compliance with the Tri--Regional Board Staff guidelines for <br /> waste oil and gasoline tank analytical recommendations . <br /> Soil Remediation and Disposal <br /> Stockpiled soil generated during UGST removal and <br /> represented by samples designated SP-la-d through SP-5a-d <br />