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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, 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) (pglL) (pglL) (pg/L) (pgll-) (pg/L) (rglL) (pg/L) (mg/L) Comments MW-1 12/18/2002 -- 1458 41 15 -2657 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 03/06/2003 P 1458 3884 -2426 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 44 06111/2003 P 1458 3812 -2354 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 213 09/23/2003 P 1458 4213 -2755 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] -- 12/09/2003 P 1458 4118 -2660 <50 -- <0 50 <0 50 <0 50 <0 50 <0 5012] — 03/09/2004 P 1458 3891 -2433 <50 -- <0 50 <0 50 <0 50 <0 50 UJ <0 50(2] 207 06/23/2004 P 1458 4370 -2912 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] 311 MW-2 117/1992 -- 1519 4711 -3192 8,000 — 82 <60 48 170 NA — No FP,No S 2/24/1992 -- 1519 61 59 -4640 NA - NA NA NA NA NA -- No FP,No S 3/31/1992 -- 1519 6137 -4618 NA -- NA NA NA NA NA — No FP,No S 4/21/1992 -- 1519 6170 -4651 1,500 - 16 <0 5 22 53 NA — No FP No S 5/11/1992 1519 6236 -4717 NA -- NA NA NA NA NA -- No FP,No S 6/23/1992 1519 6244 -4725 NA — NA NA NA NA NA -- No FP,No S 7/8/1992 -- 1519 6366 -4847 2 100 — 140 36 27 45 NA -- No FP,No S 8/10/1992 — 1519 6458 -4939 NA - NA NA NA NA NA — No FP,No S 9/15/1992 — 1519 6522 -5003 NA -- NA NA NA NA NA -- No FP,No S 10/6/1992 — 1519 6538 -5019 950 — 90 54 12 7 9 NA -- No FP No S 11/11/1992 — 1519 6469 -4950 NA -- NA NA NA NA NA -- No FP,No S 12/4/1992 - 1519 6396 -4877 NA -- NA NA NA NA NA — No FP,No S 1/20/1993 - 1519 6269 -47 50 1,400 — 41 <25 24 64 NA - No FP,No S 3/22/1993 -- 1519 6079 -4560 NA - NA NA NA NA NA — No FP,No S 4/6/1993 - 1519 6027 -4508 1,000 71 <2 5 31 88 NA -- No FP No S 7/30/1993 1519 6098 -4579 1,200 -- 35 2 6 30 15 NA -- No FP,No S 11/29/1993 -- 1519 6005 -4486 1,100 - 28 3 3 18 4 5 NA No FP No S 3/23/1994 - 1519 5514 -39 95 1,200 -- 14 77 69 52 NA -- No FP,No S 6/22/1994 - 1519 5522 -4003 1200 -- 54 15 13 58 NA No FP No S 9/28/1994 1519 5906 -4387 1 600 - 370 29 47 13 NA -- No FP,No S 12/1/1994 1519 5800 -4281 220 — 21 <05 26 <0 5 NA — No FP,No S 2/28/1995 — 1519 5508 -3989 110 - <0 5 <05 <0 5 <0 5 NA — No FP,No S 5/19/1995 — 15 19 5315 -3796 400 23 <05 21 <0 5 NA -- No FP,No S 8/28/1995 -- 1519 5483 -3964 650 — 84 <1* 93 1 1 NA — No FP,No S 1217/1995 -- 1519 5347 -3828 540 — 18 <1` 3 <1" NA - No FP,No S 2/5/1996 1 — j 1519 5193 1 -3674 310 - 2 8 1 0 6 1 3 0 8 1 NA -- No FP, No S Report Date August 4,2004 Page 4 of 20