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Updated Site Conceptual Model and Third Quarter 2003 Monitoring and Remediation Report <br /> CEeanu and Abatement Order No 5-00-707 EAI Pro ect No 1232 <br /> • 1.0 INTRODUCTION <br /> This document constitutes an updated Site Conceptual Model (SCM) and Third Quarter 2003 <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 (Figure 1) Ground water monitoring was <br /> conducted pursuant to requirements of Cleanup and Abatement Order No 5-00-707, issued to <br />' 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) (Section 1 1 5) The quarterly ground water <br />' monitoring and sampling was conducted by Gettler-Ryan Inc (GRI) Envirom-rental Audit, Inc <br /> (EA1) 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 /> (Figure 2) Between 1986 and 1988, Wards removed one waste oil UST, four bulk oil USTs, <br /> M 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 1n 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 /> 1 1 2 Wards Site Redevelopment <br /> The former Wards site is currently undergoing redevelopment by Stone Brothers The former <br /> Wards building has been demolished and the parking lot raised and resurfaced Well casing <br /> elevations and locations have been resurveyed for all wells <br /> 1 13 Unocal Site <br /> The property located at 5606 Pacific Avenue contained a gasoline station between <br /> . approximately 1955 and 1985 (Figure 2) In 1985, the station was closed and the USTs <br /> BHM WORD 1232RO351 -1- <br />