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' Updated Site Conceptual Model and Second Quarter 2002 Monitoring and Remediation Report <br /> Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 <br /> 1.0 INTRODUCTION <br /> This document constitutes an updated Site Conceptual Model (SCM) and SecondQ uarter 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 /> (EAI) 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 /> Il Background <br /> 1 1 1 Wards Site <br />' Wards formerly operated an auto service center at 5400 Pacific Avenue Stockton Cali <br /> forma <br /> (see Figure 2) Between 1986 and I988, 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 spargmg 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 i <br /> summarizes the historical ground water testing results for the Waids and Unocal sites <br />' 1 1 2 Wards Site Redevelo ment <br /> The former Wards site is currently undergoing redevelopment The building will be replaced <br /> and the parking lot will be resurfaced Therefore, it will be necessary to reinstall the existing- <br /> well <br /> xistingwell boxes to match the elevation of the resurfaced parking lot After reinstallation. of the well <br />' boxes, well casing elevations will be resurveyed pursuant to AB2886 <br />' 511M 1232RO211 y <br /> -1' <br /> ENVIRONMENTAL AUDIT, INC <br />