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i <br /> ` 5. Additional soil was removed from location C5, a confirmation sample was taken <br /> and analyzed for copper and zinc, both on a TTLC basis and extracted with DI <br /> water. <br /> 6. All analytical results for background and confirmation samples are shown in <br /> L Table I. Copies of the Laboratory Reports are included in Appendix A. Photos of <br /> the"disposal' area following cleanup follow Table I. <br /> 7. Used sand and associated contaminated soil was sent to Chemical Waste <br /> Management at Kettleman City (hazardous) and Forward Landfill in Stockton <br /> (non-hazardous), under appropriate manifests. Copies of these manifests are in <br /> Appendix B. <br /> 4.0 Data Evaluation <br /> f The levels of copper and zinc remaining in the soil following the cleanup of used sand <br /> compare as follows with a number of established criteria: <br /> I 1. Copper and zinc levels remaining in the soil are slightly higher than <br /> background levels,but in the same order of magnitude. <br /> i <br /> 2. Copper and zinc levels (average) remaining in the soil are several orders of <br /> F magnitude (greater than 60 times) lower than the United States Environmental <br /> Protection Agency Region 9 Preliminary Remediation Goals (USEPA R9 PRG) <br /> for Direct Contact Exposure Pathways for residential soil. <br /> 3. Copper and zinc levels (average) remaining in the soil are several orders of <br /> h magnitude (nearly 50 times) lower than hazardous levels as defined by <br /> L <br /> California Title 22. <br /> 4. Soluble levels of copper and zinc, as determined using a modified waste <br /> extraction test with DI water instead of citric acid, are orders of magnitude (17 <br /> i <br /> L to 130 times) lower than limits recommended to translate water quality <br /> objectives for groundwater and inland surface water issued by the California <br /> ` Regional Water Quality Control Board. <br /> 3 <br /> ►. <br />