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UPS July 15, 1992 . Job No. 074-013 ' Page 7 Soil_Stockpiles Petroleum oil was detected in all stockpile samples; concentrations range from 59 to ' 130 ppm. The average of the measured oil concentrations is 86 ppm. Diesel was detected in samples from stockpiles A and C; the data indicate concentrations of 19 ppm and 4.8 ppm, respectively. Neither kerosene, gasoline nor BTEX compounds were detected in any of the stockpile composites. Various metals, both total and soluble, were detected in all stockpile composites at concentrations within the normally expected background range; all concentrations appear well below Title 22, ' STLC and TTLC limits. The results of the 96-hour fish bioassay testing indicate that no fathead minnows died during analysis. Reported bioassay LC-50 values are well within the non-hazardous range by Title 22 standards. For a detailed review of the test results, refer to the laboratory data in the Appendix and the sample locations and designations shown on Plate 4. . CONCLUSIONS The waste-oil tank excavation has been successfully overexcavated and backfilled with compacted aggregate base material. The chemical data indicate that "clean" excavation limits were engaged at a depth of 14 feet. The existing stockpiles have been characterized in accordance with SJCEHD requirements. We understand that you have selected one of the stockpile remediation/disposal alternatives discussed during the project and have chosen a contractor. Upon review of both this report and documentation of appropriate stocl<pile disposal, we would expect SJCEHD to close the waste-oil tank and stockpile issues. 1 STATEMENT OF QUALIFICATIONS Raney Geotechnical is a geotechnical and environmental engineering firm located in 1 West Sacramento, California. The firm was founded in 1979; current professional staff includes five engineers and three geologists. The firm was involved in environmentally related geotechnical and hydrological studies as early as 1981 , shortly after the enactment of the Superfund legislation. These early environmentally driven studies were performed for uranium and coal mining clients in the mountain west, and included regional geology, groundwater quality, soil chemistry, surface water hydrology, and geotechnical engineering. The firm has performed more than 100 Phase I and II toxic audits and/or assessments within the last year, and is used as a . consultant by a number of major banks. Recent studies have included heavy industrial and military sites, as well as thousand-plus acre properties. ■ Geotechnical a, cc oe