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Remelmt,on Plan Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 1.0 INTRODUCTION ' On September S, 2000, the California Regional Water Quality Control Board Central Valley Region (RWQCB) issued Cleanup and Abatement Order No 5-00-707 (the "CAO") to Union ' Oil Company of California (Unocal), Montgomery Ward, LLC (Wards), Surry California Limited Partnership, and Stone Brothers and Associates General Partnership, for the properties located at 5400 Pacific Avenue and 5606 Pacific Avenue, Stockton, California (see Figure 1) The CAO requested the responsible parties to (1) investigate and clean up petroleum hydrocarbons released from the underground storage tank (UST) systems formerly located on 5400 Pacific Avenue and 5606 Pacific Avenue, and stated that discharges from these two ' properties have impacted ground water extracted and used by San Joaquin Delta College to irrigate its campus Ground water was extracted by Delta College from an irrigation well identified as the "Robinhood Irrigation Well" (RIW) (see Figure 1), and (2) provide San ' Joaquin Delta College a short-term and long-term irrigation water source to replace the RIW This report addresses the following action item contained in the CAO • Submit a Remediation Plan for the cleanup of soil and ground water at the former Unocal site Additionally, this report also addresses the remediation of impacted ground water near the RIW, and additional assessment activities on the Wards site to provide better data on the vertical extent of ground water impact and work on the Wards and Unocal sites to evaluate the thickness of a clay layer EAI was retained by Unocal to prepare this report This report was prepared following Tri- RegionaI Board staff "Recommendations for Preliminary Investigation and Evaluation of ' Underground Tank Sites," including Appendix A "Reports " 1 BS 1232P RAP ADD ENVIRONMENTAL AUDIT,INC