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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 TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pglL) (pg/L) (pg1L) (pg/L) (pglL) (pg/L) (mg/L) Comments <br /> MW-4 6/4/1999 - 1457 3586 -2129 <50 — <05 <05 <05 <0 5 <5 -- <br /> 9/2/1999 — 1457 4059 -2602 <50 -- <05 <05 <05 <0 5 <5 - <br /> 11/29/1999 1457 3878 -2421 <50 — <0 5 <0 5 <05 <0 5 <25 -- <br /> 3/16/2000 — 1457 3475 -2018 <50 — <0 5 <0 5 <0 5 <0 5 <25 -- <br /> 6/26/2000 — 1457 3721 -2264 <50 -- <0 5 <0 5 <0 5 <0 5 <2[2] — <br /> 9/28/2000 — 1457 4158 -2701 <50 — <05 <05 <0 5 <0 5 <2[2] — <br /> 12/19/2000 — 1457 3720 -2263 <50 — <0 5 <05 <0 5 <0 5 <2 5 -- <br /> 3/15/2001 1457 3503 -2046 <50 -- <2[4] <2[4] <2[4) <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 -28 04 <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 -2186 <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 /> 03/0612003 P 1457 3879 -2422 <50 — <050 <0 50 <0 50 <0 50 <0 50[2] 360 <br /> 06111/2003 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 4109 -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 50 <0 50[2] 149 <br /> 06/23/2004 P 1457 4377 -2920 <50 -- 080 <0 50 <0 50 050 <0 50[2] 259 <br /> 09/20/2004 P 1457 4795 -3338 <50 <25 <2 5 <2 5 <2 5 <2 5[2] 204 <br /> 12/20/2004 P 14 57 4318 -2861 <50 -- 066 <0 50 <0 50 <0 50 18[2] 274 <br /> 03/28/2005 P 1457 41 50 -2693 <50 -- <0 50 <0 50 <0 50 <0 50 1 7[2) 460 <br /> 06119/20051 P 1 14 57 41 55 -2698 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[217:::=2 <br /> MW-5 8/10/1992 — 1510 6484 -4939 NA -- NA NA NA NA NA — No FP No S <br /> 8/28/1992 -- — — -- 380 61 18 27 48 NA — No FP,No S <br /> 9/15/1992 -- 1510 6495 -5003 NA — NA NA NA NA NA — No FP,No S <br /> 10/6/1992 — 1510 6510 -5019 460 -- 59 34 21 45 NA — No FP,No S <br /> 11/11/1992 — 1510 6440 -4950 NA — NA NA NA NA NA — No FP,No S <br /> 12/4/1992 -- 1510 6367 -4877 NA — NA NA NA NA NA — No FP,No S <br /> 1/20/1993 — 1510 6239 -4750 79 — 92 1 3 <0 5 42 NA -- No FP,No S <br /> 3/22/1993 -- 1510 6051 -4560 1 NA -- NA NA NA NA NA -- No FP,No S <br /> Report Date July 27, 2005 Page 10 of 23 <br />