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NK <br /> Chc%TOA U.S-A. <br /> f Page 3 <br /> KW <br /> The scope of services performed included the following tasks: <br /> ,.•a o Obtaining necessary permits and authorization prior to the commencement of <br /> the aeration portion of the remediation; <br /> F o Observation of site remediation activities; <br /> j o Field screening of soil with a photoionization detector(PID)to help direct <br /> ,M <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 Iift's aeration,as directed <br /> 's 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 back-filling of the excavation;and <br /> w o Report our findings and conclusions. <br /> 4.0 REMEDIATION PLAN <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 removingthe <br /> contaminated soil in the u <br /> upper 2 0 feet of soil and sediment. A discrete excavation <br /> was to be centered on each of the three previously existing dispenser islands. Field <br /> screening of the soils exposed in the excavations was proposed as a means of directing <br /> the excavation efforts. <br /> isaco-ao-o<c <br /> ❑A.1£Fc� S �Inni2F <br />