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i • i Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA TQC 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) (pgll-) (pg/L) (pg/L) (pglL) (pg1L) (pglL) WWI-) (mglL) Comments MW-6 11/26/1996 — 1455 1 4901 -3446 <200*** -- <05 <0 5 <0 5 <0 5 <4* — No FP, No S 3/24/1997 -- 1455 4397 -2942 <50 -- <05 <05 <0 5 <0 5 <3 — No FP,No S 5/20/1997 -- 1455 4452 -2997 980 -- <2** <0 5 <0 5 <0 5 <3 — No FP,No S 8/19/1997 -- 1455 4812 -3357 190 -- <05 <0 5 <0 5 <0 5 <5 — No FP,No S 11/19/1997 -- 1455 4626 -3171 95 -- 34 21 1 25 <5 — 3/4/1998 — 1455 4163 -2708 60 — 1 6 <0 5 <05 <0 5 <5 -- No FP, No S 6/26/1998 — U 55 3933 -2478 101 — 0 734 <0 5 <0-5 <0 5 <5 -- 9/1/1998 — 1455 4101 -2646 205 — 0 684 <05 <05 <0 5 <5 12/2/1998 — 1455 3842 -2387 124 -- <0 5 <05 <05 <0 5 <5 — 3/31/1999 -- 14 55 3484 -2029 676 — 162 <0 5 <05 <0 5 <5 — 6/4/1999 -- 14 55 3606 -2151 118 -- 177 <05 <05 <0 5 886 -- 9/2/1999 -- 14 55 4063 -2608 201 -- 284 <05 <0 5 <05 141 -- 11/29/1999 -- 1455 3878 -2423 53 — 0 839 <05 <0 5 <G5 <2 5 -- 3/16/2000 — 1455 3484 -2029 <50 - <0 5 <0 5 <0 5 <05 <2 5 — No FP, No S 6/26/2000 — 1455 3735 -2280 191 — 129 <0 5 <0 5 <05 <2[2] — 9/28/2000 — 1455 4161 -2706 <50 -- 25 <0 5 <0 5 <05 <2[2] — 12/19/2000 — 1455 3739 -2284 <50 -- 156 <0 5 <0 5 <05 <25 — 3/15/2001 — 1455 3514 -2059 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] — 6/20/2001 — 1455 3835 -2380 <50 — <2[4] <2[4] <2[4] <2[4] <2[2] — 9/1212001 -- 1455 4268 1 -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 <050 <0 50[2] — 9/11/2002 -- 1455 4384 -29 29 <50 -- <0 50 <0 50 <0 50 <050 <0 50[2] — 12/18/2002 -- 1455 41 32 -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 3807 -2352 53 R -- <0 50 <0 50 <0 50 <0 50 <0 50[2] 427 09/23/2003 P 1455 4205 -2750 <50 — <0 50 <050 <0 50 <0 50 <0 50[2] — 12/09/2003 P 1455 41 37 -2682 180 — <1 0 <1 0 <1 0 <1 0 9 1[2] — 03/09/2004 P 1455 3910 -2455 64 — <0 50 <0 50 <0 50 <0 50 <0 50[2] 244 06/24/2004 P 1455 4392 -2937 57 — <0 50 <050 <0 50 <0 50 <0 50[2] 151 Water levels taken on 6123!04 09120/2004 P 1455 4808 -3353 97 — <0 50 <0 50 <050 <0 50 <0 50[2] Report Date October 25,2004 Page 12 of 21