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1 <br /> • <br /> GEOTHASE <br /> - ENVIRONMENTAL <br /> REPORT <br /> Quarterly Groundwater Monitoring Event <br /> Summer Quarter 2003 <br />' Cutter Lumber /Western Lift Site <br /> 3930 S. El Dorado Street <br />' Stockton, California <br /> CWRCB GID Code 70607700498 <br /> GPE Protect No 102 2 <br /> October 29, 2003 <br /> 1 <br /> 1.0 INTRODUCTION <br />' Groundwater monitoring wells were installed at the site in March of 1998 (see <br />' Report Groundwater Monitoring Well Installation and Winter 1998 <br /> Groundwater Monitoring, Cutter Lumber Site, dated April 24, 1998) The initial <br /> round of groundwater sampling was also completed at that time This report <br />' documents the 28th quarterly round of groundwater sampling completed on <br /> September 22nd, 2003 <br /> 1.1 Site History <br /> This gasoline release was discovered as a result of a groundwater monitoring <br />' event at the Western Lift Site in the southerly part of the subject Property (as <br /> shown in Figures 1, 2) during which a sample was collected from an on-site <br /> domestic well After a review of historic records, a former 1,000-gallon <br />' underground gasoline tank and an above ground diesel tank were identified <br /> along the western Property margin in the north central portion of the site <br /> Subsequent soil borings confirmed that the release had impacted the vadose <br />' zone soil and the groundwater In March of 1998, seven groundwater monitoring <br /> wells were installed to monitor the groundwater plume Two wells, MW-1 and <br />' MW-4 still remain from the initial Western Lift investigation near the south end <br /> of the Property <br />' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569 0295 <br /> I <br />