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1 <br /> i = GEO-PHASE <br /> - ENVIRONMENTAL <br /> REPORT <br /> Quarterly Groundwater Monitoring Event <br /> First Quarter 2006 <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 /> May 8, 2006 <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 a quarterly round of groundwater sampling completed on March 20th, <br /> ' 2006. <br /> 1.1 Site History <br /> 1 <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 /> • <br /> ' 2937 Veneman Ave.,#B240 Geo-Phase Environmental Ine. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br />