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PROVEN TECHNOLOGIES AND REMEDIES GUIDANCE-REMEDIATION OF METALS IN SOIL <br /> samples from the borrow area or borrow area stockpile and analyzing the samples for <br /> an appropriate list of parameters. <br /> The selected analytes should be based on the source of the fill and knowledge of the <br /> prior land use. Table 5 summarizes potential contaminants based on the fill source <br /> area. <br /> Table 5. Potential Contaminants Based on Land Use in Fill Source Area <br /> FILL SOURCE AREA POTENTIAL TARGET COMPOUNDS <br /> Land near an existing freeway Lead, PAHs <br /> Land near a mining area or rock Metals, Asbestos, pH <br /> quarry <br /> Agricultural land Pesticides, Herbicides, Metals <br /> Residential or commercial land VOCs, SVOCs, TPH, PCBs, Metals, Asbestos <br /> From DTSC (2001). <br /> A standard laboratory data package, including the quality assurance/quality control <br /> (QA/QC) sample results should accompany all analytical reports. Chemicals detected <br /> in the fill material should be evaluated for risk in accordance with the DTSC Preliminary <br /> Endangerment Assessment Guidance Manual or against the CHHSLs. If contaminant <br /> concentrations exceeding acceptance criteria are identified in the soil, the fill should be <br /> deemed unacceptable and new fill material should be obtained, sampled, and analyzed. <br /> Fill documentation should include detailed information on the previous land use(s) in the <br /> area from which the fill is taken, the findings of any environmental site assessments, <br /> and the results of any testing. If such documentation is inadequate, samples of the fill <br /> material should be collected and analyzed for an appropriate list of parameters. This <br /> alternative may be the best alternative when very large volumes of fill material are <br /> anticipated or when larger areas are considered as borrow areas. <br /> If limited fill documentation is available, samples should be collected from the potential <br /> borrow area and analyzed for an appropriate list of parameters. If fill material is not <br /> characterized at the borrow area, it will need to be stockpiled until analyses have been <br /> completed. Approximately one sample should be collected and analyzed per truckload. <br /> Table 6 provides recommended sampling frequencies for the fill soil. This sampling <br /> frequency may be modified upon consultation with appropriate regulatory agencies if all <br /> fill material is derived from a common borrow area. <br /> 35 <br />