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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 /> TO Depth to Water Level Ethyl- Total <br /> Well Date P1 Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pgll-) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (pgll-) (mg/L) Comments <br /> MW-4 3/15/2001 - 1457 3563 -2046 <50 — <2[4] <2 141 <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 -2804 <50 — <2141 <2[4] <2[4] <214] <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 <050 <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 /> 0611112003 P 1457 3822 -2365 <50 — <0 50 <050 <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 — <050 <0 50 <0 50 <0 50 <0 50121 <br /> 03/09/2004 P 1457 1 3885 -2428 <50 — <0 50 <0 50 <0 50 <0 50 <0 5012] 149 <br /> 06123/20041 P 1 1457 1 4377 1 .2920 <50 -- 080 <050 <0 50 050 <0 50[2} 259 <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 -50 03 NA - NA NA NA NA NA — No FP,No S <br /> 10/6/1992 1510 6510 -50 19 460 -- 59 34 21 45 NA — No FP,No S <br /> 11/1111992 — 1510 6440 -49 50 NA — NA NA NA NA NA — No FP,No S <br /> 12/4/1992 -- 1510 6367 -48 77 NA -- NA NA NA NA NA — No FP,No S <br /> 1/20/1993 — 1510 6239 -47 50 79 -- 92 1 3 <0 5 42 NA — No FP,No S <br /> 3/22/1993 — 1510 6051 -45 60 NA -- NA NA NA NA NA -- No FP,No S <br /> 4/6/1993 -- 1510 6001 -4508 1,600 -- 260 150 12 230 NA — No FP,No S <br /> 7/30/1993 — 1510 6075 -4579 790 — 160 88 19 71 NA -- No FP No S <br /> 11/29/1993 — 15 10 59 77 -44 86 9,600 — 1,900 870 140 1,300 NA — No FP, No S <br /> 3/23/1994 T15 10 — -- — — — -- — -- — — Well inaccessible,No FP <br /> No S <br /> 6/22/1994 — 1510 - -- — — __ — _ - Well Inaccessible,No FP, <br /> No S <br /> 9/28/1994 -- 1510 — — -- — -- — -- — -- — Well Inaccessible,No FP, <br /> Nos <br /> 10/11/1994 -- 1510 5877 4367 89 -- 21 22 18 51 NA — No FP,No S <br /> 12/1/1994 — 1510 57 70 42 60 870 -- 280 23 41 87 NA — No FP,Na S <br /> Report Date August 4,2004 Page 9 of 20 <br />