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Shell Gas Station Chronology page 2 <br /> 3011 W. Benjamin Holt Dr, Stockton <br /> September 1998 MW-4 and MW-5 installed along with soil boring SB-11 for <br /> continued lateral and vertical extent investigation. Cambria's <br /> March 2, 1999 Well Installation Report details the single <br /> analyzed soil sample from each well and the non detect <br /> results for TPHg, BTEX, MtBE, and Methanol. SB-11 soil <br /> samples detects low levels of MtBE at 10, 15, and 21 feet <br /> below ground. SB-11 ground water samples reports MtBE at <br /> 32,000 ug/I. Methanol ground water contamination noted <br /> also in SB-11. <br /> November 1999 Site undergoes remodeling to accommodate widening of <br /> Ben Holt Drive. Dispensers and piping relocated and soil <br /> sampled. Cambria's December 15, 1999 Product Dispenser <br /> and Piping Removal report details all LUFT analytes non <br /> detect. <br /> July 2001 MW-6 thru MW-9 and soil boring SB-12 installed for vertical <br /> MtBE delineation. Cambria's September 14, 2001 Site <br /> Investigation Report details MtBE detected in ground water <br /> samples from 62' and 77' bgs. First 1,2-DCA analysis for <br /> ground water monitoring wells conducted and non-detect. <br /> December 2001 Cambria's January 11, 2002 Site Investigation Report details <br /> CPT/Soil borings SB-13 thru SB-17 installed for additional <br /> vertical petroleum investigation. MtBE detected in four <br /> borings at depths of 109' and 119' bgs. Benzene also <br /> detected in SB-16 at 63' bgs. <br /> January 2003 Deep monitoring wells MW-1-49, MW-1-82, MW-2-50, and <br /> MW-2-82 installed onsite. Cambria's May 23, 2003 Site <br /> Investigation Report/QMR-First 2003 details MtBE in all <br /> ground water samples. <br /> October 2003 Monitoring wells MW-10 thru MW-12 installed during <br /> October 2003. Report of work detailed in Cambria's August <br /> 16, 2004 Site Investigation Report/Site Conceptual Model/ <br /> QMRs Fourth 2003 and First 2004. MtBE detected in MW- <br /> 11 and highest MtBE in MW-12 at 76 ug/I. MW-10 non <br /> detect. <br /> November 2004 Shell Oil sells property to operator John Kendrick and <br /> removes all UST systems. <br />