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TABLE 1 SOIL BORINGS AND WELL COMPLETIONS ARCO Service Station#2133&Chevron Service Station#9-4275 2908 and 2905 Benjamin Hilt Drive Stockton,California Well Screen Screen Well Installation Depth Diameter Top Bottom Length Comments I.D. Date (feet bgs) (inches) (feet bgs) (feet bgs) (feet) Monitoring Wells MW-1 -- 31.5 4 5 31.5 26.5 Destroyed May 2005 MW-2 -- 31.5 4 5 31.5 26.5 Destroyed May 2005 MW-3 -- 28.5 4 5 28.5 23.5 Destroyed May 2005 MW-4 -- 30 4 5 30 25 Destroyed May 2005 MW-5 -- 25 4 5 25 25 Destroyed May 2005 MW-6 03/03/92 31.5 2 10 30 20 Destroyed May 2005 MW-7 03/03/92 31.5 2 10 30 20 Destroyed May 2005 MW-8 -- 29 2 5 29 24 Destroyed May 2005 MW-9 06/20/94 31.5 2 10 30 20 Destroyed May 2005 Remediation Wells GM-1 -- 35 9 5 35 30 Destroyed May 2005 GM-2 -- 35 9 5 35 30 Destroyed May 2005 GM-3 -- 30 9 15 30 15 Destroyed May 2005 GM-4 -- 30 9 15 30 15 Destroyed May 2005 GM-5 -- 30 9 15 30 15 Destroyed May 2005 GM-6 -- 30 9 15 30 1 15 Destroyed May 2005 GM-7 -- 30 9 15 30 15 Destroyed May 2005 GM-8 -- 30 9 15 30 15 Destroyed May 2005 GM-9 -- 30 9 15 30 15 Destroyed May 2005 VW-1 1 03/03/92 20 2 12.5 17.5 5 Destroyed May 2005 R-1 I Oct-88 48? 6 8 48 40 Destroyed Proposed Well and Borings AS-8 — 60 -- -- — -- Proposed Soil Boring AS-9 -- 60 -- -- -- -- Proposed Soil Boring AS-10 -- 60 -- -- -- -- Proposed Soil Boring AS-11 -- 30 -- -- -- -- Proposed Soil Boring MW-JR -- 60 2 5 20 15 Proposed Replacement Well MW-2R -- 60 2 S 20 15 Proposed Replacement Well MW-3R — 60 2 5 20 15 Proposed Replacement Well MW-SR — 60 2 S 20 15 Proposed Replacement Well MW-7R -- 60 2 5 20 15 Proposed Replacement Well MW-9R — 60 2 S 20 15 Proposed Replacement Well MW-10 — 20 2 5 20 15 Proposed Northern Offsite Well Explanation Wells are of PVC construction bgs=Below Grade Surface --=Not Available/Not Applicable Note: Proposed well depths and screens may change based on suburface conditions encountered during installation. 2133-Well-CompAs Page 3 of