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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 PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msI) (feet bgs) (feet msl) MIL] (pg/L) (pg/L) WIL) (pg/L) (1191L) (pg/L) (mg/L) Comments <br /> MW-5 6/26/1998 — 1510 3964 -2454 <50 — 419 0 624 0 794 1 <5 -- <br /> 9/1/1998 - 1510 4144 -2634 <50 — 132 <0 5 139 0 535 515 -- <br /> 12/2/1998 1510 3874 -2364 <50 — 0 693 <0 5 <05 <0 5 894 <br /> 3/31/1999 1510 3517 -2007 <50 — 133 0 586 <0 5 1 52 994 — <br /> 6/4/1999 — 1510 3648 -2138 <50 - 503 0 721 <05 1 6 706 — <br /> 9/2/1999 -- 1510 4105 -2595 <50 — 614 <0 5 183 0 848 <5 — <br /> 11/29/1999 - 1510 3916 -2406 <50 -- 0 585 0 633 <05 145 269 — <br /> 3/16/2000 - 1510 3516 -2006 571 — 517 <0 5 <05 <0 5 4 93 -- <br /> 6/26/2000 — 1510 3780 -2270 523 — 369 <0 5 22 0 825 <2[2] — <br /> 9/28/2000 - 1510 4205 -2695 <50 -- 134 <0 5 <05 <0 5 <2[2] — <br /> 12/19/2000 -- 1510 3768 -2258 <50 — 0 561 149 <05 3 566 — <br /> 3/15/2001 1510 3550 -2040 916[3] -- <2[4] 6 71 [4) <2[4] <2[4] 89 2[2] — <br /> 6/20/2001 — 1510 3882 -2372 78[3] — 2 5[4] 5 5[4] 4 7[4] 11[4] 60[2] -- <br /> 9/12/2001 -- 1510 4305 -2795 <50 — <2[4] <2[4] <2[4] <2[4] 29[2] — <br /> 12I12/2001 -- 1510 .3989 -2479 <50 — <1 0[4] <1 0[4] <1 0[4] 1 2[4] 25[2] — <br /> 3/13/2002 — 1510 3699 -2189 <50 -- <050 061 <0 50 <0 50 35[2] — <br /> 6/18/2002 - 1510 3919 -2409 <50 -- <0 50 061 <0 50 33 7 8[2] — <br /> 9/11/2002 -- 1510 4433 -2923 63 — 34 5 19 14 91[2] — <br /> 12/18/2002 — 1510 4168 -2658 <50 — <050 44 <0 50 58 20[2] -- <br /> 03/06/2003 P 1510 3934 -2424 <50 — 15 1 7 051 32 3 0[2] 056 <br /> 06/11/2003 P 1510 3868 -2358 51 — 27 55 12 84 4 2[2] 267 <br /> 09/23/2003 P 1510 4270 -2760 95 — <25 25 <2 5 11 6 0[2] — <br /> 12/09/2003 P 1510 4173 -2663 <50 — <050 <0 50 <0 50 079 <0 50[2] — <br /> 03/09/2004 P 1510 3942 -2432 950 — 34 066 71 <0 50 4 6[2] 208 <br /> 06/23/2004 P 1510 4428 -2918 66 — 33 87 14 10 1 8[2] 243 <br /> 09/20/2004 P 1510 4844 -3334 <50 — <10 <10 <10 <10 <10[2] 0 8 <br /> 12121/2004 P 1510 4499 -2989 330 — 30 51 13 11 3 8[2] 13 Water Level Data <br /> 12/20/04 <br /> MW-6 12/4/1992 -- 1455 6340 NA 330 — <05 <0 5 <0 5 <0 5 NA — No FP,No S <br /> 1/20/1993 — 14 55 6187 4732 NA -- NA NA NA NA NA — No FP,No S <br /> 1/29/1993 — — — — 120 — <05 <05 <0 5 <0 5 NA — No FP,No S <br /> 3/22/1993 — 1455 6028 4573 NA — NA NA NA NA NA — No FP No S <br /> 4/6/1993 — 1455 5974 4519 160 — 06 <05 <0 5 <0 5 NA — No FP,No S <br /> I <br /> Report Date January 31,2005 Page 11 of 22 <br /> i <br /> I <br />