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' Third Quarter 2000 Ground Water Monitoring Report Cleanup and Abatement Order No 5-00-707 EAT Proiect No 12_32 1.0 INTRODUCTION This document constitutes the Third Quarter (July through September) 2000 ground water monitoring report for the Montgomery Ward, LLC (Wards) site located at 5400 Pacific Avenue and the former Unocal Oil Company of California (Unocal) site located at 5606 Pacific Avenue, Stockton, California Environmental Audit, Inc (EAI) was retained by Wards and Unocal to complete Joint ground water monitoring for both sites r1.1 Background ' 1 1 1 Wards Site Wards operates an auto service center at 5400 Pacific Avenue, Stockton, California (see Figure 1) Between 1986 and 1988, Wards removed one waste oil UST, four bulk oil USTs, and two gasoline USTs from the site Numerous investigations of the Wards site were conducted and a remedial system (air sparging coupled with vapor extraction) was installed to address the remediation of petroleum hydrocarbons present in soil and ground water beneath the Wards site The remedial system was put into full operation in November 1999, and has been in operation since then removing approximately 8,000 pounds of hydrocarbons to date Ground water monitoring at the Wards site has been conducted since 1993 Ground water monitoring activities for the Wards site and the 5606 Pacific Avenue property (see Section M 1 1 2), for the most part, were coordinated with the Unocal site by the various consultants representing the two entities and conducted simultaneously Table 1 summarizes the historical ground water testing results for the Wards site ' 1 1 2 Unocal Site The property located at 5606 Pacific Avenue contained a gasoline station between approximately 1955 and 1985 (see Figure 1) In 1985, the station was closed and the USTs removed After completing investigations of the site, Unocal in 1988 excavated approximately ' 6,000 cubic yards of soil from the site The excavated soil was aerated, and based on the analytical testing results associated with the aerated soil, 5,800 cubic yards of the aerated soil was reused on-site as fill, and 200 cubic yards transported off-site for disposal On August 25, ' 1989, the California Regional Water Quality Control Board, Central Valley Region (RWQCB) issued a letter for the Unocal site confirming that the soil contamination at the site has been adequately cleaned up, but, that the extent of ground water impact has yet to be defined Between 1992 and 1999, additional soil and ground water investigations associated with the Unocal site were conducted Table l summarizes the historical ground water testing results for the Unocal site BEIM 123280092 l ' ENVIRONMENTAL AUDIT, INC