SITE INFORMATION AND CORRESPONDENCE

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Mr. Philip Isorena Proposal P93-040.31 July 12, 1993 Page 4 facility, (4) underground tanks and delivery systems at the UNOCAL facility, and (5) potential migration pathways within STTC facilities. We will evaluate the location or disposition, or both, of the groundwater production well (8R) reportedly installed upgradient of the Time Oil facility. The utility locating firm that will be contracted to clear the CPT, HydroPunch, and well locations will conduct a underground survey of the area containing the well. If the well is not located, EMCON will conduct a file search at the Department of Water Resources and Port of Stockton to gather historical information on the location of the well. Potential sources for petroleum impact to groundwater will be evaluated on each of the STTC facilities by conducting pressure testing of all belowground fuel piping. The results of the line testing program will be summarized in the final report with the field data presented in an appendix. The STTC recommends that pressure testing of active and abandoned product piping on facilities owned or operated by non-STTC participating members or the Port of Stockton be conducted in concurrence with the STTC program. Task 3 activities will also include identifying the location of the Port of Stockton well identified by the RWQCB in its comments to the IPAR (see Table 2, IPAR, February 1993). At the request of the RWQCB, the location and disposition of the facility oil-water separators will be documented. Task 4. Limited Phase I Assessment EMCON will conduct a limited phase I site assessment of the Port of Stockton to determine previous tenants and past land uses in areas located to the east of the terminal. The focus of the assessment will be to identify potential sources of impact unrelated to terminal operations. We will also focus on areas where soil and groundwater impacts were detected during the interim pollution assessment that are inconsistent with observed trends and present day terminal operations. The proposed assessment will consist of environmental regulatory list review, regulatory agency file review, and evaluation of historic land use. Properties located within 0.5 mile of the perimeter that have had documented environmental impact will be identified. The regulatory list and file review will include: Federal Sources - National Priority List; Comprehensive Environmental Response, Compensation, and Liability System; Federal Facilities hazardous Waste Compliance Docket; Superfund Liens; Superfund Amendments and Reauthorization Act Title III SAGPRMT,P9304031.bc-93 1mc:5