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° ZE Auto Repair Stockton California October 7,2003 Results of Additional Site Investi ation On August 18, 2003 Horizon transported the drill cuttings stockpile to Forward Landfill for disposal The cuttings were hauled under a Non-Hazardous Waste Manifest No 2.1787 with Waste Acceptance No 3614 Copies of the manifest and Forward Inc scale ticket are contained in Appendix G WATER WELL SURVEY A well survey was conducted by Horizon to identify potential well receptors within 2000 feet of the site Horizon obtained authorization from the SJCEHD to perform a record review at the California Department of Water Resources (DWR) The signed Well Driller's Reports Inspection Request and Agreement authorizing Horizon to review the DWR records is contained in Appendix A A portion of a topographic map that includes the site location and shows section numbers is also contained in Appendix A The site location, as described above in the Site Description section, was referenced to the DWR files to access the pertinent records Twelve records were found with State Well . Numbers that indicated the wells were located in Section 22 or the neighboring Section 34 None of the well locations described in the 12 records found were within 2000 feet of the site RESULTS OF ADDITIONAL SITE INVESTIGATION The soil profile at the site is depicted in two cross sections trending north-south (A-A'), and southwest-northeast (13-13) as shown on Figure 2 The cross sections are shown on Figures 3 and 4 The upper 40 feet of the soil profile at the site generally consists of clay, sandy clay, silt, sandy silt, clayey silt, and silty sand Soils encountered from approximately 40 to 55 feet bsg (the maximum depth explored) consists of sand, silty sand, and silt Evaluation of groundwater Ievel data indicate that flow is generally northward under a gradient of approximately 0 02, as shown on Figure 5 1792rpt10-03 Project No 1792 12 6 HORIZON ENVIRONMENTAL INC