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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> Former BP Retail Site No 11191 <br /> 1469 E Hammer Lane, Stockton, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampler! NP (feet msl) (feet bgs) (feet msl) (pg/L) (pglL) (pglL) (pglL) (ugll-) (pg/L) WIL) (mglL) Comments <br /> MW-1 1/3/2002 -- -- 4740 — — -- -- — -- <br /> 1/2312002 - -- 4663 -- 110 — ND<1 0 ND<l 0 ND<1 0 1 110 — <br /> 4/11/2002 - 1917 4490 -2573 70 -- ND<1 0 ND<1 0 ND<1 0 ND<1 0 37 — <br /> 7l3112002 — 1917 4941 -3024 230 -- ND<1 ND<1 ND<1 ND<1 9,300 184 <br /> 10/11/2002 -- 1917 5142 -3225 10,000 — 42 530 250 190 10,000 — <br /> 01/30/2003 P 2272 4803 -2531 <12,000 -- <120 UJ <120 UJ <120 UJ <120 UJ 7 600*J - <br /> 04/10/2003 P 2272 4647 -2375 2 700 — <10 <10 <10 <10 4,900* -- <br /> 07/11/2003 P 2272 4978 -2706 4 200 R — <500 <500 <500 1 000 9,900* 390 <br /> 10/17/2003 P 2272 5492 -3220 4,500 R -- <250 <250 <250 300 13,000* <br /> 01/26/2004 P 2272 5028 -2756 3,000 — <100 <100 <100 <100 10,000* <br /> 04/27/2004 P 2272 4976 -2704 8,300 — <250 <250 <250 <250 11,000* — <br /> 07/01/2004 P 2272 5416 -3144 3,700 -- <120 <120 <120 <120 12,000* - <br /> 10/04/2004 P 2272 5833 -3561 3100 -- <250 <250 <250 <250 9 900* <br /> 01/12/2005 P 2272 5298 -3026 3 000 — <250 <250 <250 <250 9,400' 191 <br /> 05/11/20051 P 1 2272 1 4951 -2679 <10,000 — <100 <100 <100 <100 41800' — <br /> 107119/20051 P 2272 1 5342 .3070 <5,000 — <50 <50 <50 <50 3,700* -- <br /> MW-2 1/312002 — -- 4860 — 1800 -- ND<10 ND<10 ND<10 ND<l0 1,900 -- <br /> 1/10/2002 - — 4842 -- 1,400 -- ND<10 ND<10 ND<10 ND<10 1,800 — <br /> 4111/2002 -- 2047 4600 -2553 1,700 — ND<1 0 ND<1 0 ND<1 0 ND<1 0 1,300 — <br /> 7/31/2002 - 2047 5077 -3030 ND<50 — ND<1 ND<i ND<1 ND<1 4,500 99 <br /> 10/11/2002 — 2047 5275 -3228 9,200 -- ND<50 250 93 930 11,000 -- <br /> 01/30/2003 P 2393 4939 -2546 5 300 J — <50 UJ <50 UJ <50 UJ <50 UJ 4,900*J — <br /> 04/10/2003 P 2393 4779 -2386 2,000 — <10 <10 <10 <10 3,900*J — <br /> 07/11/2003 P 2393 5107 -2714 650 R -- <50 <50 <50 <50 1,600* 140 <br /> 10/17/2003 P 2393 5615 -3222 12,000 — <250 <250 <250 <250 22,000* - <br /> 01/26/2004 P 2393 5158 -2765 270 — <100 <100 <100 <100 980* -- <br /> 04/27/2004 P 2393 5099 -2706 1 700 — <50 <50 <50 <50 -- <br /> 07/01/2004 P 2393 5527 -31 34 4,100 — <250 <250 <250 <250 15,000* - <br /> 10/04/2004 P 2393 5952 -3559 520 -- <25 <25 <25 <25 1,500* -- <br /> 01/12/2005 P 2393 5432 -3039 2,800 <250 <250 <250 <250 9 800* 273 <br /> 05/11/2005 P 2393 50 86 -2693 <1 200 — <12 <12 <12 <12 720* — <br /> 07/1912005 P 1 2393 1 5361 -2968 <500 — <50 I <50 1 <5 0 <5 0 720* — <br /> Report Date August 31,2005 Page i of 4 <br />