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SECTION 1 Introduction This report presents results of supplemental site characterization and monitoring well installation activities conducted by CH2M HILL for Del Monte Foods (Del Monte),at the Disco site in Stockton,California. This investigation was developed to provide additional characterization of 1,2 DCA and petroleum hydrocarbons in groundwater beneath, downgradient,and cross-gradient of the Disco property. Design and location of monitoring wells was based on results of the supplemental site characterization. This report plan is being submitted to San Joaquin County Public Health Services/Environmental Health Division(PHS/EHD).Del Monte is complying with the PHS/EHD requirements for site characterization and remediation activities,by the Health and Safety(H&S)Code Section 25299.37(b)(c)(6),to be eligible for reimbursement of corrective action costs from the State Water Resources Control Board Underground Storage Tank Cleanup Fund(USTCF).The investigation was described in further detail in the Work Plan for Additional CPT Investigation,Monitoring Well and Extraction Well Installation at the Disco Property Stockton,California (Work Plan) (CH2M HILL,2000). E 1.1 Objectives The objectives of this work were to: } • Define the lateral,vertical, and downgradient extent of 1,2 DCA in groundwater; • Install monitoring wells to provide vertical,cross-gradient and lateral monitoring points. Information obtained during this fieldwork will be used to determine the appropriate next steps,with respect to additional site activities and site remediation. 1.2 Report Organization The remainder of this report is organized as follows: 0 Section 2,Site Setting and Background • Section 3,Summary of Field Methodology • Section 4,Field Activities and Results o Section 5,Conclusions and Recommendations + Section 6,References E SFOICPTMW_REPORT KS_OOC1003670036 {