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Mr. Harlin Knoll <br /> San Joaquin County <br /> November 6, 1995 <br /> Page 2 <br /> subcontractor with OSHA 40-hour trained personnel will be selected to conduct the <br /> excavation, stockpiling, and transport of excavated material. <br /> Areas will be excavated until no staining or odor are apparent. Excavations will be <br /> barricaded and/or covered with steel plates pending receipt of analytical results and <br /> authorization for backfilling. If initial confirmatory samples contain concentrations of <br /> TPH greater than 100 ppm, additional excavation will be conducted at those locations. <br /> Soil will be stockpiled on plastic and covered with plastic until transport and disposal <br /> at licensed facilities. At the Linden site, soil impacted with TPH, lead, and cadmium <br /> will be stockpiled separately from soil impacted by TPH alone. <br /> Sampling <br /> Discrete confirmatory soil samples will be collected from excavations in areas of TPH <br /> concentrations greater than 100 ppm. In excavations less than two feet deep, soil <br /> samples will be collected only from the floor of the excavation. In excavations greater <br /> than two feet deep, one sample will be collected from the approximate midpoint of <br /> each sidewall and from the floor of the excavation. In Area No. 1 at the Linden site, <br /> two samples will be collected from each of the east and west sidewalls and the <br /> excavation floor. Soil samples from excavations greater than four feet deep will be <br /> collected from the backhoe bucket. Field personnel will not enter any excavation <br /> greater than four feet deep. Soil samples will not be collected from visibly stained <br /> areas with concentrations of TPH less than 100 ppm. <br /> Composite stockpile samples will be collected at the rate of four samples for every 50 <br /> cubic yards of stockpiled soil and will be composited 4:1 in the analytical laboratory. <br /> All soil samples will be collected in clean brass sleeves which will be sealed with <br /> Teflon tape and plastic caps. All soil samples will be placed in a chilled, insulated <br /> container and transported to Pace, Inc. a California State certified analytical <br /> laboratory. <br /> Discrete confirmatory soil samples will be analyzed for TPH-scan using EPA Method <br /> 8015M. In addition, confirmatory soil samples from Area No. 1 at the Linden site will <br /> be analyzed for total lead and cadmium using the EPA 6010/7000 series. Stockpile <br /> samples will be analyzed according to the requirements of the anticipated disposal <br /> facilities. Chain-of-custody protocol will be maintained on all samples from collection <br /> to acceptance by the analytical laboratory. <br /> 181 HYDRO-SERRCH,II IC. A Tetra Tech Company <br />