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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date Pl Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes Mt8E DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (091L) (Ug/L) (u91L) tog/L) (pg/L) (pg/L) (Irg1L) (mg/L) Comments MW-5 12/19/2000 — 1510 3768 -2258 <50 - 0 561 149 <0 5 3 566 -- 3/15/2001 — 1510 3550 -2040 91 6[3] -- <2[4] 6 71 [4] <2[4] <2[4] 89 2[2] -- 6120/2001 — 1510 3882 -2372 78[3] 2 5[4] 5 5[4] 4 7[4] 11[4) 60[2] — 9/12/2001 1510 4305 -2795 <50 -- <2[4] <2[4] <2[4] <2[4] 29[2] - 12/12/2001 — 1510 3989 -2479 <50 -- <1 0[4] <1 0[4] <1 0[4] 1 2[4] 25[2) - 3/13/2002 — 1510 3699 -2189 <50 — <0 50 061 <0 50 <0 50 35[2] -- 6/18/2002 -- 1510 3919 -2409 <50 — <0 50 061 <0 50 33 7 8[2] — 9/11/2002 -- 1510 4433 -2923 63 -- 34 5 1 9 14 91[2] — 12/18/2002 — 1510 4168 -2658 <50 — <0 50 44 <0 50 58 20[2] -- 03/06/2003 P 1510 3934 -2424 <50 - 15 17 051 32 3 0[2] 056 06/11/2003 P 1510 3868 -2358 51 -- 27 5 5 12 84 4 2[2] 267 09/23/2003 P 1510 4270 -2760 95 -- <2 5 2 5 <2 5 11 6 0[2] — 12/09/2003 P 1510 41 73 -2663 <50 -- <0 50 <0 50 <0 50 079 <0 50[2] — 03/09/2004 P 1510 3942 -2432 950 — 34 066 71 <0 50 4 6[2] 208 06/23/2004 P 1510 4428 -2918 66 — 33 87 14 10 1 8[2] 243 09/20/2004 P 1510 4844 -3334 <50 -- <10 <10 <10 <10 <1012] 080 12/21/2004 P 1510 4499 -2989 330 -- 3 0 51 1 3 11 3 8[2] 1 30 Water Level Data 12/20/04 03/27/2005 P 1510 4174 -2664 <50 — 078 14 060 34 6 6[2] 220 106119/20051 P 1 1510 1 4210 1 -2700 1 <50 I — 087 J 1 082 <0 50 21 4 4[2]J 260 MW-6 12/4/1992 — 1455 6340 NA 330 — <05 <0 5 <0 5 <05 NA — INO FP, No S 1/20/1993 -- 1455 6187 4732 NA NA NA NA NA NA -- No FP,No S 1/29/1993 -- — — — 120 — <05 <0 5 <05 <0 5 NA -- No FP,No S 3/22/1993 — 1455 6028 4573 NA -- NA NA NA NA NA — No FP,No S 4/6/1993 -- 1455 5974 4519 160 — 0 6 <05 <0 5 <0 5 NA — No FP,No S 7/30/1993 — 1455 6040 4585 170 - <0 5 <05 <0 5 <05 NA -- No FP,No S 11/29/1993 -- 1455 5961 4506 150 — <0 5 <05 <0 5 <0 5 NA -- No FP,No S 3/23/1994 — 1455 5460 4005 270 -- 69 69 6 29 NA — No FP,No S 6/22/1994 -- 1455 5466 4011 <10 — 03 <0 3 <0 3 <0 5 NA -- No FP,No S 9/28/1994 -- 1455 5850 4395 <50 -- 12 1 <0 5 <0 5 NA — No FP, No S 12/1/1994 — 1455 5746 4291 <50 — 08 <0 5 <0 5 <0 5 NA -- No FP,No S 2/28/1995 -- 1455 5454 -3999 55 -- <05 <0 5 <0 5 <0 5 NA — No FP,No S 5/19/1995 — 1455 5259 -3804 96"` -- <05 <05 <0 5 <0 5 NA — No FP,No S 8128/1995 -- 14 55 1 54 25 1 -3970 120 — <0 5 1 <05 <0 5 <0 5 NA jNo FP,No S Report Date July 27,2005 Page 12 of 23