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GEO-PHASE <br /> - ENVIRONMENTAL <br /> REPORT <br /> Quarterly Groundwater Monitoring Event <br /> Fourth Quarter 2003 <br /> Cutter Lumber /Western Lift Site <br /> 3930 S. El Dorado Street <br /> Stockton, California <br /> CWRCB GID Code 70607700498 <br /> ' GPE Project No. 102.2 <br /> February 6, 2004 <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 Lumher Site, dated April 24, 1998). The initial <br /> round of groundwater sampling was also completed at that time. This report <br /> documents the 29th quarterly round of groundwater sampling completed on <br /> ' December 12th, 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 /> 1 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br />