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' Well Installation Report <br /> 5606 Pacific Avenue Stockton California(CAO No 5-00707) EAI Project No 1232 <br />' 1.0 INTRODUCTION <br />' Environmental Audit, Inc (EAI) was retained by Unocal Oil Company of California (Unocal) <br /> to install seven ground water monitoring wells associated with the property located at 5606 <br /> Pacific Avenue Stockton, California (Site) (see Figure 1) The Site is owned by Stone <br />' Brothers and was formerly leased to Unocal for operation of a gasoline service station In <br /> 1985, the station was closed and the underground storage tanks (USTs) removed <br />' The scope of this investigation is outlined in the EAI report titled "Results of CPT Investigation <br /> and Work Plan," dated December 27, 2000, (see EAI, 2000) and in a EAI memorandum titled <br /> "Installation of Ground Water Monitoring Wells Memorandum," dated January 5, 2001 (see <br /> EAI, 2001) The scope of work was approved by the California Regional Water Quality <br /> Control Board, Central Valley Region (RWQCB) in a letter dated January 9, 2001 The scope <br /> of the investigation included <br /> • Installing seven ground water monitoring wells (including two dual completion wells) <br /> • Analytically testing of soil samples <br /> Preparing this report <br />' The .results of testing ground water samples collected from these seven new wells in March <br /> 2001, will be included in the First Quarter 2001 Monitoring Report for the Site These data, in <br /> conjunction with other information for the Site and surrounding area will be used to develop a <br /> Corrective Action Plan (CAP) for the Site <br /> 11 Background <br /> The Site contained a gasoline station between approximately 1955 and 1985 (see Figure 1) In <br /> 1985, the station was closed and the USTs removed After completing investigations of the <br /> Site, Unocal in 1988 excavated approximately 6,000 cubic yards of soil from the site The <br /> excavated soil was aerated, and based on the analytical testing results associated with the <br /> aerated soil, 5,800 cubic yards of the aerated soil was reused on-site as fill, and 200 cubic yards <br /> transported off-site for disposal On August 25, 1989, the RWQCB issued a letter for the Site <br /> confirming that the soil contamination at the Site had been adequately cleaned up, but, that the <br /> extent of ground water impact needed further investigation Between 1992 and 1999, <br /> additional soil and ground water investigations associated with the Site were conducted <br /> BHM i212R0121 1 <br />' ENVIRONMENTAL AUDIT, INC <br />