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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (wg/L) (NgIL) (pg1L) (pgIL) (pg/L) (ug/L) (pg/L) (mg/L) Comments MW-1 9/28/1994 1458 5817 -4359 420 - 68 14 29 <05 NA -- No FP,No S 12/1/1994 -- 1458 5711 -4253 220 -- 24 <05 <0 5 <0 5 NA — No FP,No S 2/28/1995 -- 1458 5421 -3963 340 -- 21 <05 06 <0 5 NA — No FP,No S 5/19/1995 1458 5241 -3783 210 — 29 <05 07 <0 5 NA -- No FP No S 8/28/1995 1458 5404 -3946 240 — 32 <05 1 <0 5 NA -- No FP No S 1217!1995 - 1458 5267 -3809 190 — 17 <0 5 <0 5 <0 5 NA — No FP,No S 2/5/1996 — 1458 5011 -3553 230 — 25 <05 0 5 <0 5 NA -- No FP,No S 5/30/1996 — 1458 4717 -3259 180*** — 12 <05 <0 5 <0 5 <4** — No FP,No S 9/18/1996 - 1458 5096 -3638 200 -- 1 6 <05 <0 5 <0 5 <5** — No FP,No S 11/26/1996 — 1458 4880 -3422 220 -- 1 5 <05 <05 <0 5 5 — No FP,No S 3/24/1997 — 14 58 4373 -2915 <50 -- <0 5 <05 <05 <0 5 <3 -- No FP,No S 5/20/1997 14 58 4432 -2974 230 -- <7" <0 6** <0 5 05 <5** — 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 -- 14 58 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 <0 5 <0 5 <0 5 <5 -- 9/1/1998 — 1458 4089 -2631 249 — 519 <0 5 <0 5 <0 5 <5 -- 12/2/1998 1458 3820 -2362 227 - <0 5 <05 <0 5 <0 5 127 — 3/31/1999 - 1458 3468 -2010 152 — <0 5 <0 5 <0 5 <0 5 <5 - 6/4/1999 — 1458 3598 .2140 168 — 263 <0 5 <0 5 <0 5 109 -- 9/2/1999 -- 1458 4049 -2591 232 — 104 <0 5 <0 5 <0 5 <5 -- 11/29/1999 -- 1458 3864 -2406 129 — <0 5 <0 5 <0 5 <0 5 <2 5 — 3/16/2000 -- 1458 3466 -2008 552 -- <0 5 <0 5 <0 5 <0 5 <2 5 -- 6/26/2000 — 1458 3726 -2268 175 — <0 5 <0 5 <0 5 <0 5 <2[2] — 9/28/2000 — 1458 4149 -2691 86 9[3] -- 214 <0 5 <05 <0 5 <2[2] — 12/19/2000 -- 1458 3717 -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 -- 1458 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 1458 3936 1 -2478 <50 — <1 0[4] <1 0[4] <1 0[4] <1 0[4] 0 54[2] - 3/13/2002 -- 1458 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 — <050 <0 50 <050 <0 50 <0 50[2] - Report Date August 4,2004 Page 3 of 20