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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes ME DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pglL) (prg/L) Cog/L) (ug/L) (Pg/L) (trg/L) (trg/L) (mg/L) Comments MW-5 12/09/2003 P 1510 41 73 -2663 <50 <0 50 <0 50 <0 50 0 79 <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 1 4 10 1 8[2] 243 09/20/2004 P 1510 4844 -3334 <50 <10 <10 <10 <10 <10[2] 0 8 12/21/2004 P 1510 4499 -2989 330 30 51 1 3 11 3 8[2] 1 3 lWater Level Data 12/20/04 03/27/2005 P 1510 4174 2664 <50 078 1 4 060 3 4 6 6[2] 22 06/19/2005 P 1510 4210 2700 <50 087 J 082 <0 50 21 4 4[2]J 2 6 09/11/2005 P15 10 4664 -3154 170 54 64 32 15 14[2] 22 12/11/2005 P 1 151 4349 -2839 120 4 8 38 1 2 Be 19[2] 2 6 MW-6 12/4/1992 1455 6340 NA 330 <0 5 <0 5 <0 5 <0 5 NA -- No FP,No S 1/20/1993 1455 6187 4732 NA NA NA NA NA NA No FP No S 1/29/1993 -- -- -- 120 <0 5 <0 5 <0 5 <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 06 <0 5 <0 5 <0 5 NA No FP, No S 7/30/1993 1455 6040 4585 170 <0 5 <0 5 <05 <0 5 NA No FP,No S 11/29/1993 1455 5961 4506 150 <05 <0 5 <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 0 3 <0 3 <03 <0 5 NA No FP, No S 9/28/1994 1455 5850 4395 <50 1 2 1 <0 5 <0 5 NA - No FP No S 12J111994 1455 5746 4291 <50 0 8 <0 5 <0 5 <0 5 NA No FP, No S 2/28/1995 1455 5454 3999 55 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 5/19/1995 14 55 52 59 -38 04 96"' <05 <0 5 <0 5 <05 NA INo FP, No S 8/28/1995 1455 5425 3970 120 <0 5 <0 5 <0 5 <0 5 NA No FP,No S 12/7/1995 1455 5291 -3836 <200" <0 5 <0 5 <0 5 <0 5 NA No FP No S 2/5/1996 1455 5039 -3584 130 <0 5 <0 5 1 <05 <0 5 NA No FP, No S 5/30/1996 1455 4738 3283 140"' <0 5 <05 <0 5 <0 5 <3 No FP, No S 9/18/1996 1455 51 26 3671 <200`,. <0 5 <0 5 <0 5 <0 5 1 <3 No FP, No S 11/26/1996 1455 4901 -3446 <200"' <0 5 <0 5 <0 5 <0 5 <4" No FP No S 3/24/1997 1455 4397 -2942 <50 <0 5 <0 5 <05 <0 5 <3 No FP, No S 5/20/1997 1455 4452 -2997 180 <2" <0 5 <0 5 <0 5 <3 No FP, No S 8/19/1997 1455 4812 -3,357 190 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 11/19/1997 1455 44626 31 71 95 34 21 1 25 <5 3/4/1998 14 55 41 63 1 -27 08 60 1 6 <0 5 <0 5 <0 5 <5 INo FP, No S Report Date January 25,2006 Page 13 of 25