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• • i 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 P1 Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pgIL) (pg/L) (pg1L) (pgIL) (pg1L) (jig/L) (pg/L) (mg/L) Comments MW-1 5/20/1997 -- 1458 4432 -2974 230 — <7"' <0 6" <0 5 0 5 <Y. -- No FP No S 8/19/1997 — 1458 4778 -3320 200 65 <05 <0 5 <0 5 <5 -- No FP, No S 11/19/1997 — 1458 4595 -31 37 170 - 7 077 <0 5 063 <5 - 3/4/1998 - 1458 4133 -2675 <50 — 051 <0 5 <0 5 <0 5 <5 — No FP,No S 6/26/1998 — 1458 3913 -2455 248 -- 173 <0 5 <0 5 <0 5 <5 - 911/1998 - 14 58 4089 -2631 249 -- 519 <0 5 <0 5 <05 <5 — 12/2/1998 - 1458 3820 -2362 227 <0 5 <0 5 <05 <0 5 127 -- 3/31/1999 -- 1458 3468 -20 10 152 — <05 <0 5 <0 5 <0 5 <5 -- 6/4/1999 1458 3598 -21 40 168 - 263 <0 5 <0 5 <0 5 109 -- 9/2I1999 — 1458 4049 -2591 232 -- 104 <05 <0 5 <0 5 <5 — 11/29/1999 -- 1458 3864 -2406 129 — <0 5 <05 <0 5 <0 5 <25 — 3/16/2000 — 1458 3466 -2008 552 -- <0 5 <05 <0 5 <0 5 <25 — 6/26/2000 -- 1458 372 6 -2268 175 -- <05 <05 <0 5 <05 <2[2] — 9/28/2000 -- 1458 4149 -2691 86 9[3] -- 214 <0 5 <0 5 <0 5 <2[2] - 12/19/2000 1458 37 17 -2259 <50 -- <05 <0 5 <0 5 <0 5 <2 5 - 3/15/2001 -- 1458 3500 -2042 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] 6/20/2001 14 58 3827 -2369 <50 — <2[4] <2[4] <2[4] <2[4] <2[2] 9/12/2001 -- 1458 4247 -2789 <50 — <2[4] <2[4] <2[4] <2[4] <2[2] -- 12/12/2001 - 14 58 3936 -2478 <50 -- <1 0[4] <1 0[4] <1 0[4] <1 0[4] 0 54(2] -- 3/13/2002 -- 14 58 3646 -2188 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] - 6/18/2002 1458 3865 -2407 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[2] — 9/11/2002 1458 4373 -2915 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] 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 06/11/2003 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 50[2] 03/0912004 P 1458 3891 -2433 <50 -- <0 50 <0 50 <0 50 <0 50 UJ <0 50[2] 207 MW-2 1/7/1992 — 1519 4711 -31 92 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 Report Dafe May 12,2004 Page 3 of 19