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' Updated Site Conceptual Model and Third Quarter 2002 Monitoring and Remediation Report <br /> Cleanup and Abatement Order No_5-00-_7.07 _ EAI Proiect No 1232 <br /> 1.0 INTRODUCTION <br />' This document constitutes an updated Site Conceptual Model (SCM) and Third Quarter 2002 <br /> Monitoring and Remediation Report for the former Montgomery Ward, LLC (Wards) site <br /> located at 5400 Pacific Avenue and the former Union Oil Company of California (Unocal) site <br /> located at 5606 Pacific Avenue, Stockton, California (see Figure 1) Ground water monitoring <br /> was conducted pursuant to requirements of Cleanup and Abatement Order No 5-00-707, issued <br /> to Wards, Unocal, Surry California Limited Partnership, and Stone Brothers and Associated <br /> General Partnership on September 8, 2000, by the California Regional Water Quality Control <br /> Board, Central Valley Region (RWQCB) (see Section 1 1 4) The quarterly ground water <br />' monitoring and sampling was conducted by Gettler-Ryan Inc (GRI) Environmental Audit, Inc <br /> (EAT) was retained by Unocal to complete this report <br /> This report was prepared pursuant to the CAO and a RWQCB letter for this matter dated <br /> February 8, 2002 <br /> ' 1.1 Background <br /> 1 1 1 Wards Site <br /> ' Wards formerly operated an auto service center at 5400 Pacific Avenue, Stockton, California <br /> (see Figure 2) Between 1986 and 1988, Wards removed one waste oil UST, four bulk oil <br /> USTs, and two gasoline USTs from the site Numerous investigations of the Wards site were <br /> conducted and a remedial system (air sparging coupled with vapor extraction) was installed to <br /> address the remediation of petroleum hydrocarbons present in soil and ground water beneath <br /> ' the Wards site The remedial system was put into full operation in November 1999, and was in <br /> operation until December 2000 when the auto service center and remedial system were shut <br /> down due to Wards filing bankruptcy During its operation, the Wards remedial system <br /> removed approximately 8,000 pounds of hydrocarbons <br /> Ground water monitoring at the Wards site has been conducted since 1993 Ground water <br />' monitoring activities for the Wards site and the Unocal site, for the most part, were coordinated <br /> by the various consultants representing the two entities and conducted simultaneously Table 1 <br /> summarizes the historical ground water testing results for the Wards and Unocal sites <br /> r1 12 Wards Site Redevelopment <br /> The former Wards site is currently undergoing redevelopment The former Wards building has <br /> been demolished and the parking lot raised and resurfaced Well casing elevations and <br /> locations have been resurveyed for all wells <br />' 1 1 3 Unocal Site <br /> The property located at 5606 Pacific Avenue contained a gasoline station between <br /> approximately 1955 and 1985 (see Figure 2) In 1985, the station was closed and the USTs <br /> r <br /> 111M WORD 1212RO211 1- ENVIRONMENTAL AUDIT, INC p <br />