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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 Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) WL) (pg/L) WIL) (pg/L) (pg1L) (prg/L) (mg/L) Comments MW-3 01/26/2004 P 2324 5079 -2755 3,600 - <250 <250 <250 <250 17,000' — 04l27/2004 P 2324 5016 -2692 3,600 — <50 <50 <50 <50 6,300*J -- 07101/2004 P 1 23 2454 37 .3113 2,700 — <120 <120 <120 <120 8,800* — MW-4 113/2002 _ -- 4898 — 6,300 -- ND<1 0 ND<1 0 ND<1 0 ND<1 0 9,400 -- 4/11/2002 — 2089 4646 -2557 22,000 — ND 7/31/2002 -- 2089 5122 -3033 ND<50 -- ND<1 ND<1 ND<1 ND<1 1,900 158 10/11/2002 — 2089 5312 -3223 ND<2500 — ND<25 ND<25 ND<25 ND<25 9 000 -- 01/30/2003 P 2434 4977 -2543 <50 000 -- <500 UJ <500 UJ <500 UJ <500 UJ 14,000*J — 04/10/2003 P 2434 4820 -2386 8,600 -- <50 <50 <50 <50 17,000* -- 07/11/2003 P 2434 5162 -2728 910 -- <50 <50 <50 <50 2,200* 20 10/17/2003 P 2434 5632 -31 98 15,000 R — <500 <500 <500 <500 37,000- 01/26/20 P 2434 51 89 -2755 6,200 - <250 <250 <250 <250 22,000- — 04/27/2004 !' 24 34 5156 -2722 820 -- <25 <25 <25 64 810* — 07/0112004 P 2434 5571 .3137 7,900 — <500 <500 <500 <500 24,000- — MW-5 04/10/2003 P 1 2291 4661 -2370 900 — <50 <50 <5 0 <50 1,900- -- 07/11/2003 P 2291 5043 -2752 1,100 R -- <50 <50 <50 <50 3,000* 21 10/17/2003 P 2291 5490 -31 99 1,600 R <50 <50 <50 <50 3,600* — 01/26/2004 P 2291 5038 -27 47 1,300 -- <100 <100 <100 <100 4,300* -- 04/27/2004 P 2291 5008 -2717 3,100 -- <50 <50 <50 <50 4,600* -- 07l01/2004 P 22 91 5441 -31 50 1,400 — <50 <50 <50 <50 4,900* -- MW-6 04/10/2003rP 2207 4595 -23 8 <50 — <0 50 <0 50 <0 50 <0 50 <25 — 07111/2003 2207 4965 -2758 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 3 4 10/17/2003 2207 5427 -3220 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* -- 01/2612004 2207 4974 -2767 75 - <0 50 <0 50 <0 50 <0 50 <0 50* — 04/27/2004 2207 4970 -2763 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* — 1071011/20041 P 1 2207 54 12 1 '3205 <50 — <0 50 1 <0 50 1 <0 50 <0 50 <0 50* — I MW-7 04/10/2003 P 1 2243 4630 -2387 <50 — <0 50 <050 <0 50 <0 50 <2 5 — 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* — 01/2612004 P 2243 5013 -2770 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* -- 04/27/2004 P 22 43 49 56 -27 13 <50 - <0 50 <0 50 <0 50 <0 50 <0 50- — Page 2 of 4 Report Date August 18,2004