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• Table I 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) W/L) (pg1L) (pg/L) (pg/L) (pg1L) (pg/L] (mg1L) Comments MW-1 3/22/1993 -- 1458 5995 -4537 NA -- NA NA NA NA NA — No FP, No S 4/6/1993 -- 1458 5947 -4489 1,500 -- 250 64 30 76 NA -- No FP,No S 7/30/1993 -- 14 58 6019 -4561 2,100 -- 390 130 38 79 NA -- INo FP,No S 11/29/1993 — 1458 5929 -4471 1,200 — 230 12 11 16 NA -- No FP,No S 3/23/1994 — 1458 5433 -3975 1,900 — 120 82 25 75 NA — No FP,No S 6/22/1994 — 1458 5411 -3988 910 — 13 4 41 19 NA -- No FP,No S 9/28/1994 -- 14 58 5817 -4359 420 -- 6 8 14 29 <0 5 NA -- No FP,No S 12/1/1994 -- 14 58 5711 -4253 220 -- 24 <0 5 <0 5 <0 5 NA — No FP,No S 2/28/1995 — 14 58 5421 -39 63 340 — 21 <0 5 06 <0 5 NA -- No FP,No S 5/19/1995 -- 1458 5241 -3783 210 -- 29 <0 5 07 <0 5 NA -- No FP,No S 8/28/1995 -- 14 58 5404 -3946 240 -- 32 <0 5 1 <0 5 NA — No FP,No S 12/7/1995 -- 14 58 5267 -3809 190 -- 17 <0 5 <05 <0 5 NA — No FP,No S 2/5/1996 — 14 58 5011 -3553 230 -- 2 5 <0 5 0 5 <0 5 NA — No FP,No S 5/30/1996 -- 1458 4717 -3259 180.** -- 12 <0 5 <0 5 <0 5 <4** INo FP,No S 9/18/1996 -- 14 58 5096 -3638 200 -- 1 6 <0 5 <0 5 <0 5 <5** — No FP,No S 11/26/1996 — 1458 4880 -3422 220 — 1 5 <05 <0 5 <0 5 5 — No FP,No S 3/24/1997 -- 14 58 4373 1 .2915 <50 -- <0 5 <05 <0 5 <0 5 <3 — No FP,No S 5/20/1997 -- 1458 4432 -2974 230 — <7** <0 6" <0 5 05 <5'* -- No FP,No S 8/19/1997 — 1458 4778 -3320 200 — 65 <0 5 <0 5 <0 5 <5 -- No FP,No S 11/19/1997 — 1458 4595 -3137 170 — 7 077 <0 5 063 <5 — 3/4/1998 — 1458 41 33 -2675 <50 — 051 <05 <0 5 <0 5 <5 — No FP No S 6/26/1998 — 1458 3913 -2455 248 — 1 73 <05 <0 5 <05 <5 — 9/1/1998 — 1458 4089 -2631 249 -- 519 <05 <0 5 <05 <5 -- 12/2/1998 — 1458 3820 -2362 227 -- <0 5 <0 5 <05 <0 5 127 - 3/31/1999 -- 1458 3468 -2010 152 — <05 <0 5 <05 <0 5 <5 -- 6/4/1999 — 1458 3598 -2140 168 -- 263 <0 5 <05 <0 5 109 -- 9/2/1999 — 1458 4049 -2591 232 — 104 <0 5 <0 5 <0 5 <5 -- 1'112911999 -- 1458 3864 -2406 129 -- <05 <05 <0 5 <0 5 <2 5 -- 3/16/2000 — 1458 3466 -2008 552 — <05 <0 5 <0 5 <0 5 <2 5 — 6/26/2000 — 1458 3726 -2268 175 — <0 5 <05 <0 5 <0 5 <2[2] — 9/28/2000 -- 14511 41411 -21511 86 9[3] — 214 <05 <0 5 <0 5 <2[2] -- 12/19/2000 — 14 58 3717 -2259 <50 -- <0 5 <0 5 <0 5 <0 5 <2 5 — 3/15/2001 -- 14 58 3500 -20 42 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] — Report Date October 25,2004 Page 3 of 29