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05-20-91 Subsurface Investigation Large anomaly was a mechanics pit, 1. Excavate the buried concrete. <br /> small anomaly was a thickened slab <br /> perhaps used as a footing for structural 2. Excavate the sand and grease <br /> support or heavy equipment. traps. <br /> No evidence of soil contamination was <br /> uncovered near either anomaly. 3. Take soil samples. <br /> Excavation by the bus garage revealed <br /> no tank and no evidence of hydrocarbon <br /> contamination. <br /> No total petroleum hydrocarbons were <br /> detected in the soil samples taken by excavation. Pg. 10 <br /> • 07-29-91 Subsurface Investigation No evidence of buried items,backfilled soil "Potential environmental problems <br /> or potential sources of contamination were at the site have been addressed <br /> uncovered near the thickened slab. satisfactorily after excavating large <br /> No signs of contamination in the soil were observed portions of the site. No evidence of <br /> by the sand and grease traps. contamination in sufficient levels to <br /> No evidence of sumps or soil contamination was warrant remediation." <br /> uncovered below the chinese restaurant pad. <br /> Laboratory analysis showed that while some motor <br /> oil and diesel were detected beneath the northern <br /> and central sumps,the level of contamination detected <br /> is far below the action level set by the State of <br /> California Regional Water Quality Control Board's <br /> Investigation Manual. No remediation is warranted. Pgs. 3-4 <br /> • <br />