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16 <br /> On August 18, 1998 samples were taken at the five locations shown in Figure 4, sample date August 18, <br /> 1998. Results of the sampling at 16 and 17 feet indicated non detect for hydraulic and motor oil. The <br /> water sampled at 14 feet,before beginning excavation,indicated non detect for diesel,motor oil, and <br /> hydraulic oil. Results of soil samples are listed in Table 5. <br /> Stockpiled soil covered with visqueen excavated from the contaminated area resulted in non detect for <br /> benzene, toluene, ethyl benzene, and xylenes. Metals analysis were below the TTLC limits listed in Title <br /> 22, 66261.24. Hydraulic oil was reported at 1300 mg/kg and motor oil was reported at 350 mg/kg. <br /> 6 QUALITY CONTROL <br /> Quality control practices were utilized during sample collection and handling, shipping,analysis, and <br /> data reporting. Good field and laboratory practices were utilized to ensure quality results and reliable <br /> data. <br /> Method blank samples were used to determine whether contamination from outside sources were being <br /> introduced into the analytical process. Contained within the Chromalab and Clayton Analytical Lab test <br /> reports are the quality assurance data. <br /> 7 CONCLUSION <br /> PG&E has excavated the location to 17 feet below grade surface and verified clean-up levels utilizing the <br /> field screening techniques described above. Clean-up verification samples were collected from the <br /> excavated area and sent to an EPA-Certified Laboratory for TEPH analysis as Hydraulic Oil,Diesel, and <br /> Motor Oil. Laboratory results verify clean-up to non-detect for all constituents of concern(with a <br /> detection level of 50 mg/kg). The contamination zone has been backfilled with clean soil and all <br /> i contaminated soil excavated and disposed of according to Title 22 waste criteria. PG&E believes that <br /> soil cleanup objectives have been met and is not planning further excavation or characterization work at <br /> this location unless otherwise directed <br /> 562 1-98 100.doc 5 <br />