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J 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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) WIL) (pg/L) (Erg/L) (pg/L) WIL) (mg/L) Comments MW-3 07/11/2003 P 2324 5012 -2688 5,000 R — <500 <500 <500 <500 10 000* -- 10/17/2003 P 2324 5526 -3202 9,700 R — <500 <500 <500 <500 25,000* — 01/26/2004 P 2324 5079 -2755 3,600 -- <250 <250 <250 <250 17,000* -- 04/27/2004 P 2324 5016 -2692 3,600 -- <50 <50 <50 <50 6,300*J -- 07/01/2004 P 2324 5437 -3113 2,700 — <120 <120 <120 <120 8,800* -- 10/0412004 P 2324 5822 -3498 780 — <50 <50 <50 <50 2,700* -- MW-4 1/3/2002 — -- 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<1 0 ND<1 0 ND<1 0 ND<1 0 11,000 — 7/31/2002 — 2089 5122 -3033 ND<50 ND<t ND<l ND<1 ND<1 1,900 158 10/11/2002 — 2089 5312 -3223 N13<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* — 07/11l2003 P 2434 51 62 -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* — 01/26/2004 P 2434 5189 -2755 6,200 -- <250 <250 <250 <250 22,000* — 04/27/2004 P 24 34 5156 -2722 820 — <25 1 <25 1 <25 64 810* - 07/01/2004 P 2434 5571 -3137 7,900 <500 <500 <500 <500 24,000- 1010412004 P 2434 5977 4543 7,400 <250 1 <250 <250 <250 17,000* -- MW-5 04/10/2003 P 2291 4661 -2370 900 — <50 <50 <50 <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* — 01l2612004 P 2291 5038 -2747 1,300 — <100 <100 <100 <100 4,300* - 04/27/2004 P 2291 5008 -2717 3 100 — <50 <50 <50 <50 4,600* — 07/01/2004 P 2291 5441 -31 50 1,400 — <50 <50 <50 <50 4,900- 110/04120041 P 1 2291 1 5837 1 -3546 1 1,900 — <50 1 <50 <50 <50 1 4,800'` -- MW-6 04/10/2003 P 2207 4595 -2388 <50 -- <0 50 <0 50 <0 50 <0 50 <2 5 — 07/11/2003 P 2207 4965 -27 58 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 34 10/17/2003 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* -- 04127l2004 P 2207 4970 -2763 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* -- 07/01/2004 P 2207 5412 -3205 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* — 10/04/2004 P 2207 5788 -3581 <50 — <0 50 <0 50 <0 50 <0 50 <0 5o* .- Report Date December 14,2004 Page 2 of 4