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1 <br /> presence of TPHd (11,000 ppm, Table 1) However, only a small percentage of the diesel <br /> contamination is considered leachable, as evidenced by the Toxicity Characteristic Leaching <br /> ' Procedure (TCLP) analysis results for TPHd (1 3 ppm) Excavated soil was characterized and <br /> transported to Forward Landfill in Manteca, California for disposal <br /> Approximately 15 cubic yards of soil was excavated from the former waste oil tank pit A <br /> ' confirmation soil sample collected from the floor of the pit indicated that no BTEX constituents, <br /> TPHg, oil and grease, halogenated volatile organics, or polychlorinated biphenyls were present <br /> Low levels of chromium, nickel, zinc and TPHd were detected At the direction of San Joaquin <br /> County Public Health Services, Environmental Health Division (PHS/EHD) the pit was <br /> ' backfilled with the excavated soil <br /> ' Laboratory analytical results are summarized in Table I and soil sample locations are shown on <br /> Plate 7 <br /> 1 In correspondence dated May 10, 1994 PHS/EHD concluded that risk to groundwater from <br /> residual diesel contamination is limited and that no further investigative or remedial action for <br /> ' the diesel or the waste oil tank pits are warranted <br /> 7.0 SOIL REMEDIATION ALTERNATIVES <br /> In accordance with PHS/EHD's guidelines, RESNA has considered at least two remediation <br /> ' alternatives, which are discussed below The following general response alternatives for the site <br /> have been considered <br /> ' o Alternative 1 - Passive Remediation <br /> O Alternative 2 - Soil Excavation and Off-site Disposal <br /> ' o Alternative 3 - Soil Vapor Extraction with Groundwater Monitoring <br /> 1500471RMR1SICAP 0694 FNL 8 <br />