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I GEOTHASE <br /> • <br /> - ENVIRONMENTAL <br /> REPORT <br /> Quarterly Groundwater Monitoring Event <br /> 5 October 1999 <br /> Cutter Lumber Site <br /> 3422 & 3430 S. El Dorado Street <br /> Stockton, California <br /> Project No 102 2 <br /> 3 November 1999 <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 seventh quarterly round of groundwater sampling completed on 5 <br />' October 1999 <br /> 1.1 Site History <br /> The site of the subject gasoline release was discovered as a result of a <br /> groundwater monitoring event at the Western Lift Site in the southerly part of <br />' the subject Property (as shown in Figures 1, 2) during which a sample was <br /> collected from an on-site domestic well After a review of historic records, a <br /> former 1,000 gallon underground gasoline tank and an above ground diesel tank <br />' were identified along the western Property margin in the north central portion <br /> of the site Subsequent soil borings confirmed that the release had impacted the <br /> vadose zone soil and the groundwater In March of 1998, seven groundwater <br /> monitoring wells were installed to monitor the groundwater plume <br /> • <br />' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569 0295 <br /> 1 <br />