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I <br /> s <br /> PROPOSED INVESTIGATION AND WORKPLAN <br /> The previous investigation results indicate the soil at this site <br /> is contaminated with TPHG, BTEX, and TOG. John P. Cummings and <br /> Associates (JPCA) , therefore, proposes to characterize the vertical <br /> extent of the soil contamination. The proposed tasks of the <br /> investigation are listed below: <br /> 1) Prepare a site health and safety plan. <br /> 2) Obtain well drilling permits and contact U S Alert to mark any <br /> possible underground utilities. <br /> Notify the San Joaquin County Environmental Health Division (SJEHD) <br /> # : oursprie itia�tf. of,.,f ie� „ . . <br /> _ <br /> 3) Advance three soil borings which will be converted into 2 inch <br /> diameter monitoring wells to an approximate depth of 50 ft or ten <br /> feet into the saturated zone whichever occurs first, using a truck <br /> mounted drill rig and 8-inch diameter hollow-stem augers near the <br /> former Tank Pit area, as shown in Figure 2. <br /> 4) Collect soil samples at each 5 ft level interval or at <br /> significant changes in lithology commencing at a depth of fifteen <br /> feet, using a split spoon tube sampler loaded with pre-cleaned <br /> brass tubes. It is assumed that the upper 15 feet is disturbed soil <br /> that is known to be backfill and would not provide meaningful data. <br /> A maximum of 18 soil samples are anticipated to be collected. <br /> 5) Sampling equipment will be decontaminated using tri-sodium <br /> phosphate solution (TSP) and twice rinsed with the last rinse using <br /> distilled water prior to sampling. <br /> 6) Soil samples collected in the lowest brass liner will be <br /> preserved by covering both ends with Teflon tape, capping with <br /> plastic caps and sealing the caps with plastic tape. <br /> 7) soil sa ate will be labeled and logg" und*w <br /> Custody (COC) control. <br /> 8) Soil samples will be stored in a cooler with ice, transported <br /> to a state certified laboratory for analysis with COC <br /> documentation. <br /> 9) Soil cuttings will be monitored with an Organic Vapor Detector <br /> for the presence of volatile hydrocarbons. <br /> 10) All borings will be logged by inspection of the samples and <br /> classified using the Unified Soil Classification System by a <br /> California Certified Engineering Geologist. <br /> 4 <br />