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TABLE TWO <br /> Summary of Chemical Analyses of <br /> SOIL SAMPLES FROM UST <br /> All results in parts per million (ppm) <br /> Sample TPH TPH Ethyl Total Total <br /> ID. Gasoline Diesel Benzene Toluene Benzene Xylenes Lead <br /> TANK <br /> LOCATION <br /> 7.0' <br /> <0.2 <50 <0.005 <0.005 <0.005 <0.005 12 <br /> EPA 5030/ 3550/ 8020 8020 8020 8020 7420 <br /> METHOD 8015 8015 <br /> 9.0 B 6EKFILLING <br /> The borehole and test pits were backfilled with native material to the ground <br /> surface. <br /> 10.0 CONCLUSIONS AND RECOMMENDATIONS <br /> q Based on the results of soil sample collection and analyses the following <br /> conclusions and recommendations apply: <br /> UNDERGROUND STORAGE TANK AREA <br /> The only constituent detected was total lead at 12 ppm. This <br /> concentration is most likely a background level not due to any product <br /> loss from the UST. No petroleum hydrocarbons were detected in the soil <br /> sample. ASE recommends no further action in respect to the soil <br /> Jsurrounding the former motor fuel UST. <br /> x AREA BENEATH FORMER CHEVRON PIPELINE <br /> It appears that the subsurface soils have been impacted by the former <br /> crude and bunker c pipeline operated by Chevron in the early 1900s. Of <br /> the eight (8) test pits and respective soil samples, three showed minor to <br /> J insignificant concentrations, and one showed significant concentrations of <br /> oil and grease and hydrocarbons (Pipe Location E @ 1600 ppm and 890 <br /> i ppm respectively). ASE has speculated as to the cause of the oil and <br /> a <br /> Qj grease contamination as follows: <br /> a) The elevated oil and grease concentrations are due to actual leakage <br /> of the pipeline for a long period of time. This leakage could have come in <br /> the form of a crack in the pipeline or a fault in the joint along the pipe <br /> couplings. <br /> Schulte and Chrisman Road, Tracy CA - May 1995 (ASE #2857) <br />