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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 P1 Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msi) (,uglL) (pg/L) (pg/L) (pg1L) (pg/L) (pglL) (pg1L) (mg1L) Comments <br /> MS-3A 06/11/2003 P -- 3815 -- <50 -- <0 50 <0 50 <0 50 <0 50 11 [2]J 377 <br /> 09/24/2003 P — 4217 - <50 — <0 50 <0 50 <0 50 <0 50 0 63[2] -- <br /> 12/10/2003 P -- 4127 — 140 -- 19 22 4 2 27 0 58[2] -- <br /> 03/09/2004 P -- 3793 - 1,100 -- 39 057 88 <0 50 2 9[2] 1 99 <br /> 06/23/2004 P -- 4415 -- <50 — 14 0 83 <050 <0 50 33[2] _381 <br /> MS-313 12/19/2002 — -- 4184 — 1 200 26 14 27 <0 50 7 1[2] — <br /> 03/06/2003 P - 3923 -- 1,100 -- 68 35 71 56 19[2] 20 <br /> 06/11/2003 NP -- 3849 -- <50 — <0 50 <0 50 <0 50 <0 50 9 4[2]J 419 <br /> 09/24/2003 NP -- 4253 -- <50 -- <0 50 <0 50 <050 <0 50 0 65[2] — <br /> 12/10/2003 P -- 4186 — 190 -- 26 30 59 37 0 63[2] -- <br /> 03/09/2004 -- - 3928 — 1200 35 052 75 <0 50 3 2[2] -- <br /> 06/2412004 NP — 4321 -- 120 — <25 <25 <2 5 <2 5 <2 5[2] 192 Water levels taken on <br /> 6123104 <br /> MW-1 1/7/1992 -- 1458 6148 -4690 18,000 — 1,600 610 140 85 NA -- No FP,No S <br /> 2/24/1992 -- 1458 6076 4618 NA -- NA NA NA NA NA — No FP No S <br /> 3/31/1992 — 1458 6056 -4533 NA -- NA NA NA NA NA — No FP,No S <br /> 4/21/1992 -- 1458 6091 -4633 5,200 -- 1,400 360 53 260 NA -- No FP,No S <br /> 5/11/1992 — 1458 6157 -4699 NA — NA NA NA NA NA — No FP,No S <br /> 6/23/1992 — 1458 6168 -4710 NA -- NA NA NA NA NA — No FP,No S <br /> 7/8/1992 — 1458 6284 -4826 6,500 — 1,900 320 89 230 NA -- No FP,No S <br /> 8/10/1992 -- 1458 6374 4916 NA NA NA NA NA NA — No FP No S <br /> 9/15/1992 — 1458 6437 4979 NA — NA NA NA NA NA -- No FP, No S <br /> 10/6/1992 -- 1458 6452 -4994 11,000 -- 2,500 600 210 470 NA — No FP,No S <br /> 11/11/1992 — 1458 6383 -4925 NA -- NA NA NA NA NA — No FP No S <br /> 12/4/1992 -- 14 58 6310 -4852 NA NA NA NA NA NA -- No FP,No S <br /> 1/20/1993 -- 14 58 6183 -4725 1,800 -- 260 100 10 34 NA -- No FP,No S <br /> 3/22/1993 -- 1458 5995 -4537 NA NA NA NA NA NA -- No FP,No S <br /> 4/6/1993 -- 1458 5947 -4489 1,500 — 250 64 30 76 NA -- INo FP,No S <br /> 7/30/1993 -- 1458 6019 -4561 2,100 -- 390 130 38 79 NA — No FP,No S <br /> 11/29/1993 — 1458 5929 -4471 1,200 -- 230 12 11 16 NA No FP,No S <br /> 3/23/1994 — 1458 5433 -3975 1,900 -- 120 82 25 75 NA -- No FP,No S <br /> 6/22/1994 -- 14 58 5411 -3988 910 -- 13 4 41 19 NA — No FP,No S <br /> Report Date August 4,2004 Page 2 of 20 <br />