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_ - -- 1 11 1 - - is - -: :.�`�`._ NOWT <br /> r <br /> Evaluation of Contamination January 3, 1989 <br /> Former Texaco Service Station, Manteca, California AGS 38053-1 <br /> o The concentrations of TPII as gasoline in the soil and <br /> the concentration of benzene present in the ground <br /> water at the locations tested do not appear :.o be a <br /> threat to local drinking water sources, given the <br /> distance to the nearest water-supply well at this time. ! <br /> Based on the initial concentrations of TPH as gasoline, that <br /> remain in the soil at 18 feet below grade, which is the limit .of i <br /> the initial excavation, Applied GeoSystems recommends re-- it <br /> excavating the tank cavity to the ground-water surface. The soil <br /> currently in the former tank cavity should be re-excavated and <br /> sampled to evaluate the level of hydrocarbon concentration. <br /> Further, the soil should be analyzed for organic lead to evaluate <br /> if the total lead present is organic in nature. <br /> Because a sewer line is present by the eastern portion of the <br /> tank cavity and the service station building is present on the <br /> west edge of the tank cavity, we recommend excavating the tank <br /> cavity vertically and, if necessary, to the north. The <br /> monitoring well located on the south side of the former tank <br /> cavity showed no evidence of soil contamination so excavation <br /> probably would not be necessary to the south. After excavation, <br /> the tank cavity should be backfilled with an appropriate clean <br /> t <br /> _ I <br /> 17 - -- . - <br /> APP/led GeoSystems <br />