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S <br /> i <br /> Chevron U.S.A. - Page 4 <br /> �1 <br /> petroleum hydrocarbons contamination in ground water. Further, the monitoring <br /> EE^ well chemical analysis data has been interpreted as suggesting contaminant plume <br /> movement in ground water beneath the subject property along the interpreted <br /> rN� <br /> it <br /> gradient. <br /> 044I <br /> Based upon review of the quarterly monitoring data, Chevron U.S.A. has <br /> requested that Dames & Moore prepare a workplan to further assess the ground <br /> I <br /> water contamination and hydrogeologic conditions beneath the subject property. <br /> ru <br /> [,c <br /> Further, Chevron has requested that Dames & Moore assist in the preparation of a <br /> ground water remediation system design for the subject property. The following <br /> I <br /> workplan summarizes the details of our proposed investigation. <br /> 3 i <br /> 3.0 PURPOSE AND SCOPE OF WORK <br /> The purpose of the proposed investigation will be to evaluate the lateral <br /> migration of ground water contamination noted at the subject property disclosed <br /> ' by the quarterly monitoring being conducted at the subject property. The <br /> i <br /> a investigation will be accomplished by and limited to soil boring, subsoil <br /> sampling, installation of <br /> ground water monitoring wells, chemical analysis of <br /> E.:p <br /> subsoil and ground water samples obtained, and in-situ hydraulic testing of the <br /> aquifer at the subject property. The data obtained from the investigation, <br /> coupled with review of published data and review of previous contamination <br /> assessments conducted at the subject property will be used to help assess <br /> the lateral trends of contamination migration in ground water. The data will <br /> also be utilized in the evaluation of the applicability and implementation of the <br /> tv <br /> most appropriate ground water remedial technology for the subject property. It is <br /> anticipated that the investigation will be within and outside of the original <br /> `�- Chevron service station lease line property boundaries. <br /> D.�ME,, N1001tc <br />