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Chevron U.S.A. <br /> Page 4 <br /> 3 .Q PURPOSE AND SCOPE <br /> The Purpose and Scope of our investigation was outlined <br /> in Dames & Moore 's Proposed Remedial Action Plan of September <br /> 15, 1989, addressed to Chevron U.S.A. The plan was modified <br /> in an addendum to the plan dated January 8, 1990. The <br /> purpose of the remedial action was to reduce the potential <br /> for further migration of contamination found in site soils. <br /> The scope of services performed included the following <br /> tasks: <br /> o Obtaining necessary permits and authorization prior <br /> to the commencement of the field portion of the <br />. remediation; <br /> o Observation of site remediation activities; <br /> o Field screening of soil with a photoionization <br /> detector (PID) to help direct the remedial <br /> activity; <br /> o Obtain soil samples at the limits of the <br /> excavation, as directed by the site representative <br /> of San Joaquin County; <br /> o Chemical analysis of soil samples to evaluate the <br /> presence and concentration of petroleum <br /> constituents as referenced to gasoline; <br /> o Observe aeration of soil and collect composite <br /> samples at the frequency specified by the Regional <br /> Water Quality Control Board; <br /> o Observe backfilling of the excavation; and <br /> o Report our findings and conclusions. <br /> 16000-250-044 <br /> Corrected <br />