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7 <br /> 111512 1 M: <br /> c <br /> Sits contasinatinn wockPIA2 <br /> Stxktan Plating In" <br /> Pago -3- <br /> additional 6 cubic yards of soil from the excavation ir. an effort <br /> to remove the motor oil contamination. AEMC reported the <br /> excavated soils had the characteristics of rubble/fill material. <br /> AEMC collected two soil samples (#06213A and #06213B), from the <br /> west and east sides of the excavation, respectively. Laboratory <br /> analyses indicated: <br /> (A) significantly lower total lead concentrations (37.9 <br /> mg/kg and 21.5 mg/kg) . <br /> (S) No detectable hydrocarbons (<10 ,mg/kg) in sample <br /> t #06213A (west sample) . <br /> (C) hydrocarbons in the diesel range detected at 940 mg/kg <br /> in sample #06213B (east sample) . <br /> a {D) very low levels of aromatic volatile organics detected. <br /> Tvi <br /> AEMC concluded there was r,jo evidence to suggest the contents <br /> of the excavated gasoline tank:were the source of the <br /> contamination and recommended that SPI request county <br /> authorization to backfill the excavation (Underground Tank . <br /> y { The San <br /> Remov�al.and Soil Sampling, by AEMC, October G, 1986) . <br /> Joaquin County Environmental Health Department placed the <br /> !C1 investigation on hold until further notice. <br /> TA <br /> h4 <br /> ga <br /> On December 11, 1990, Oil Equipment Service, removed one <br /> ' 2,000-gallon underground fuel storage tank (TK1-90) from SPI <br /> Nul <br /> CONDOR <br />