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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes Mt8E DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (p92) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg1L) (mg/L) Comments MW-6 1217!1995 — 1455 5291 -3836 <200** -- <0 5 <05 <0 5 <05 NA — No FP, No S 2/5/1996 — 1455 5039 -3584 130 -- <05 <05 <0 5 <0 5 NA -- No FP,No S 5/30/1996 — 1455 4738 -3283 140*** -- <0 5 <0 5 <05 <0 5 <3 -- No FP,No S 9/18/1996 — 1455 5126 -3671 <200*** -- <0 5 <0 5 <0 5 <05 <3 -- INo FP,No S 11/26/1996 — 1455 4901 -3446 <200*** — <0 5 <05 <0 5 <0 5 <4** — INo FP,No S 3/24/1997 -- 14 55 4397 -2942 <50 — <05 <05 <0 5 <0 5 <3 — Na FP No 5 5/20/1997 -- 1455 4452 -2997 180 — <2** <05 <0 5 <0 5 <3 — No FP,No S 8/19/1997 -- 1455 4812 -3357 190 — <05 <0 5 <0 5 <05 <5 — No FP, No S 11/19/1997 — 1455 4626 -3171 95 — 34 21 1 2 5 <5 — 3/4/1998 — 1455 4163 -2708 60 — 16 <05 <05 <0 5 <5 — No FP,No S 6/26/1998 — 1455 3933 -2478 101 -- 0 734 <0 5 <05 <0 5 <5 -- 9/1/1998 -- 1455 4101 -2646 205 — 0 684 <0 5 <0 5 <05 <5 12/2/1998 — 1455 3842 -2387 124 -- <05 1 <05 <0 5 <0 5 <5 — 3/31/1999 — 1455 3484 -2029 676 — 162 <05 <0 5 <0 5 <5 — 6/4/1999 -- 1455 3606 -2151 118 — 177 <0 5 <0 5 <0 5 886 — 9/2/1999 — 14 55 4063 -2608 201 — 284 <0 5 <0 5 <0 5 141 -- 11/29/1999 -- 1455 3878 1 -2423 53 — 0 839 <05 <0 5 <0 5 <25 -- 3/16/2000 -- 1455 3484 -2029 <50 — <0 5 <0 5 <0 5 1 <05 <2 5 No FP,No S 6/26/2000 -- 1455 3735 -2260 191 -- 129 <05 <0 5 <0 5 <2[2] — 9/28/2000 -- 1455 4161 -2706 <50 -- 25 <0 5 <05 <0 5 <2[2] — 12/19/2000 — 1455 3739 -2284 <50 — 156 <05 <05 <0 5 <2 5 — 3/15/2001 — 1455 3514 -2059 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] — 6/20/2001 -- 14 55 3835 -2380 <50 — <2[4] <2[4] <2[4] <2[4] <2[2] -- 9/12/2001 — 1455 4268 -2813 <50 -- <2[4] <2[4] <2[4] <2(4) <2[2] 12/12/2001 -- 1455 3950 -2495 73[6] — <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] -- 3/13/2002 1455 3663 -2208 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] — 6/18/2002 1455 3874 -2419 <50 <0 50 <0 50 <0 50 <0 50 1 <0 50[2] — 9/11/2002 1455 4384 -2929 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] — 12/18/2002 -- 1455 4132 -2677 71 - <0 50 <0 50 <0 50 <0 50 <0 50[2] 03/06/2003 P 1455 3900 -2445 200 <0 50 <0 50 <0 50 <0 50 <0 50[2] 147 06/11/2003 P 1455 3817 -2352 53 R <0 50 <0 50 <0 50 <0 50 <0 50[2] 427 09/23/2003 P 145 4205 -2750 <50 -- S<'15004 <0 50 <0 50 <0 50 <0 50[2]12/09/2003 P 14 55 41 37 26 82 180 — <1 0 <1 0 <1 0 9 1[2] -- �nrm Report Date July 27,2005 Page 13 of 23