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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2130 <br /> 7906 N EL Dorado Street, Stockton, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date P/ Elevation Water Elevation TPI-Ig TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) [feet ms]) Cog/L) (pg1L) (pglL) (pg/L) (pg/L) (pg1L) (pg/L) (mg/L) Comments <br /> MW-4 5/30/1996 -- 1457 4721 -3264 <50 -- <0 5 <05 <0 5 <0 5 <3 -- No FP,No S <br /> 9/18/1996 — 1457 51 80 -3723 <50 — <0 5 <05 <0 5 <0 5 <3 -- No FP, No S <br /> 11/26/1996 — 1457 4884 -3427 <50 -- <0 5 <05 <0 5 <0 5 <3 — No FP,No S <br /> 3/2411997 -- 1457 43 84 -2927 <50 — <0 5 <05 <0 5 <0 5 <3 -- No FP,No S <br /> 5/20/1997 — 1457 4434 -2977 <50 -- <0 5 <05 <05 <0 5 <3 — No FP, No S <br /> 8/19/1997 -- 1457 4789 -3332 <50 — <0 5 <0 5 <0 5 <0 5 <5 -- No FP No S <br /> 11/19/1997 -- 1457 4601 -3144 <50 — 1 1 068 <0 5 054 <5 -- <br /> 3/4/1998 -- 1457 4164 -2707 <50 -- <0 5 <0 5 <05 <0 5 <5 -- No FP No S <br /> 6/26/1998 -- 1457 3916 -2459 <50 141 <0 5 <05 <0 5 <5 -- <br /> 9/1/1998 -- 1457 4183 -2726 <50 — <0 5 <0 5 <0 5 <05 <5 -- <br /> 12/2/1998 — 1457 3822 -2365 <50 -- <05 <0 5 <05 <05 <5 -- <br /> 3/31/1999 — 1457 3477 -2020 <50 -- <0 5 <0 5 <0 5 <0 5 <5 — <br /> 6/4/1999 - 1467 3586 -2129 <50 <0 5 <0 5 <05 <0 5 <5 — <br /> 9/2/1999 — 1457 4059 -2602 <50 <0 5 <0 5 <0 5 <0 5 <5 — <br /> 11/29/1999 — 1457 3878 -2421 <50 -- <0 5 <0 5 <0 5 <0 5 <25 -- <br /> 3/16/2000 -- 1457 3475 -2018 <50 <0 5 <0 5 <0 5 <0 5 <2 5 — <br /> 6/26/2000 - 1457 3721 -22 64 <50 -- <0 5 <0 5 <05 <0 5 <2[2] - <br /> 9/28/2000 -- 1457 4158 -2701 <50 — <0 5 <0 5 <05 <0 5 <2[2] — <br /> 12/19/2000 -- 1457 3720 -2263 <50 - <0 5 <0 5 <05 <0 5 <25 — <br /> 3/15/2001 1457 3503 -2046 <50 -- <2 14] <2[4] <2 t4] <2[4] <2[2] -- <br /> 6/20/2001 — 1457 3833 -2376 <50 -- <2[4] <2[4] <2[4] <2[4] <2[2] -- <br /> 9/12/2001 1457 4261 -2804 <50 — <2[4] <2[4] <2[4] <2[4] <2[2] -- <br /> 12/12/2001 1457 3937 -2480 <50 -- <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] — <br /> 3/13/2002 1457 3643 -21 86 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] — <br /> 6/18/2002 1457 3870 -2413 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] -- <br /> 9/11/2002 - 1457 4386 -2929 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] - <br /> 12/18/2002 -- 1457 4108 -2651 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] -- <br /> 03/06/2003 P 1457 3879 -2422 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] 36 <br /> 06/11/2003 P 1457 3822 -2365 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] 377 <br /> 09/23/2003 P 1457 4225 -2768 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] -- <br /> 12/09/2003 P 1457 41 09 -2652 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2] — <br /> 03/09/2004 P 1457 3885 -2428 <50 — <0 50 <0 50 <0 50 <0 5o <0 50[2] 149 <br /> MW-5 8/10/1992 -- 1510 6484 -4939 NA -- NA NA NA NA NA -- No FP No S <br /> Report Date May 12,2004 Page 8 of 19 <br />