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Table 1 Groundwater Elevation and Analytical Data Former BP Retail Site No 11191 1469 E Hammer Lane, Stockton, CA TOC Depth to Water LevelI Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg1L) (pg/L) (pglL) (ug1L) (pg/L) (pg1L) (pg/L) (mg/L) Comments MW-5 10/04/2004 P 2291 5837 -3546 1,900 — <50 <50 <50 <50 4,800• — 01/12/2005 P 2291 5308 -3017 2000 -- <100 <100 <100 <100 6,200* 299 05/11/2005 P 2291 4965 -2674 <5,000 -- <50 <50 <50 <50 4,200* -- MW-6 04/10/2003 P 2207 4595 -2388 <50 -- <050 <050 <050 <0 50 <2 5 — 07111/2003 P 2207 4965 -2758 <50 -- <0 50 <050 <050 <0 50 <0 50* 34 1 G/1 7/2003 P 2207 5427 -3220 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* — 01/26/2004 P 2207 4974 -2767 75 — <0 50 <0 50 <0 50 <0 50 <0 50* -- 04/27/2004 P 2207 4970 -2763 <50 — <0 50 <0 50 1 <050 <0 50 <0 50* -- <50 — <0 50 <0 50 <0 50 <0 50 <0 50 07!01!2004 P 22 07 5412 -32 05 * -- 10/04/2004 P 2207 5768 -3581 <50 - <0 50 <0 50 <0 50 <0 50 <0 50*01/1212005 P 2207 5207 -3000 <50 <0 50 <0 50 <0 50 <0 50 <0 50* 329 05/11/2005 P 1 2207 4891 -2684 <50 -- <0 50 <0 50 <0 50 <0 50 1 <0 50* — MW-7 04/10/2003 P 2243 4630 -2387 <50 -- <0 50 <0 50 <0 50 <0 50 <25 1 -- 07/11/2003 P 2243 4960 -2717 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 39 10/17/2003 P 2243 5485 -3242 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* -- 01/26/2004 P 2243 5013 -2770 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* -- 04/27/2004 P 2243 4956 -2713 <50 -- <0 50 <0 50 <0 50 <0 50 <050 — 07/01/2004 P 2243 5396 -3153 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* — 10/04/2004 P 2243 5819 -3576 <50 <0 50 <050 <0 50 <0 50 <0 50* -- 01/12/2005 P 2243 5285 -3042 <50 -- <0 50 <050 <0 50 <0 50 <0 50* 385 05/11/2005 P 2243 4949 1 .2706 <50 -- <050 <0 50 <0 50 <0 50 <0 50* -- Report Date June 15,2005 Page 3 of 4