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Chevron U SA <br /> Page 3 <br /> The scope of services performed included the following tasks <br /> o Obtaining necessary permits and authorization prior to the commencement of <br /> the aeration portion of the remediation, <br /> o Observation of site remediation activities; <br /> o Field screening of soil with a photoionization detector (PID) to help direct <br /> the remedial activity, <br /> o Observe aeration of soil and collect composite samples at the frequency <br /> specified by the Regional Water Quality Control Board, <br /> o Obtain soil samples at the completion of each lift's aeration, as directed <br /> by the site representative of San Joaquin Department of Health, <br /> Environmental Health Division; <br /> o Chemical analysis of soil samples to evaluate the presence and concentration <br /> of petroleum constituents as referenced to gasoline, <br /> o Observe backfilling of the excavation, and <br /> o Report our findings and conclusions <br /> 4.0 REMEDIATION PLAIN <br /> The plan for remediation of site soils was outlined in Dames & Moore's proposed <br /> remedial action plan of September 15, 1989 The plan as it was approved by the San <br /> Joaquin Department of Health, Environmental Health Division consisted of removing the <br /> contaminated soil in the upper 20 feet of soil and sediment A discrete excavation <br /> was to be centered on each of the three previously existing dispenser islands Field <br /> screerung of the soils exposed in the excavations was proposed as a means of directing <br /> the excavation efforts <br /> 15000-250-044 <br /> DN%iFs S MOORE <br />