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• i • Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2188 3212 N California Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (41L) (ig/L) (ug/L) (pg/L) (trg/L) (uglL) (ug/L) (mg/L) Comments MW-3 12/3/1999 -- 1455 3812 -2357 <50 - <05 <05 <05 <0 5 <2 5 - No FP,No S 4/3/2000 - 1455 3485 -2030 <50 -- <05 <05 <0 5 <0 5 <50 -- No FP,No S 6/22/2000 -- 1455 3490 -2035 <50 -- <20 <20 <2 0 <2 0 <2 0[4] - No FP,No S 9/27/2000 - 1455 4007 -2552 <50 - <05 <05 <0 5 <0 5 4 98[4] -- No FP,No S 10/19/2000 - 1455 3996 -2541 NA -- NA NA NA NA NA - Not observed 12/20/2000 -- 1455 3811 -2356 <50 - <05 <05 <0 5 <0 5 <2 5 -- No FP,No S 3/16/2001 - 14 55 3703 -2248 <50 -- <05 <0 5 <0 5 <0 5 <2 0[4] - No FP No S 6/21/2001 - 1455 3970 -2515 <50 - <05 <0 5 <0 5 1 <0 5 <2 0[4] - No FP,No S 9/13/2001 - 1455 4540 -3085 <50 - <0 5 <0 5 <0 5 <0 5 <2 0[4] - No FP,No S 12/1 112001 -- 1455 4281 -2826 <50 - <0 50 <0 50 <0 50 <0 50 <2 0[4] No FP,No S 3/14/2002 -- 1455 3976 -2521 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] -- No FP,No S 6/19/2002 -- 1455 4197 -2742 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] -- No FP, No S 9/12/2002 -- 1455 4878 -3423 <50 <0 5 <0 5 <0 5 <05 <05 -- No FP, No S 12/3/2002 - 1455 4597 -3142 <50 - <05 <0 5 <05 <05 <05 - No FP,No S 03/11/2003 P 1455 4639 -3184 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] 096 06/09/2003 P 1455 4318 -2863 <50 - <0 50 <050 <0 50 <0 50 <0 50[4] 38 09/16/2003 P 1455 5086 -3631 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 148 12111/2003 P 1455 4620 -3165 <50 -- <0 50 <0 50 <0 50 084 0 81[4] -- 03110/2004 P 1455 4654 -3199 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 196 06/17/2004 P 1453 4762 -3309 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] 25 09/23/2004 P 1453 5385 -3932 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] 46 12/21/2004 P 1453 4862 - -34 09 <50 - <0 50 <0 50 1 <0 50 1 <0 50 <0 50[4] 42 MW-4 11/20/1997 -- 1383 4836 -3453 89 - 1 11 063 2 11 -- No FP No S 2/17/1998 - 1383 4355 -2972 180 - 0 57 <0 5 <0 5 059 29 -- No FP,No S 6/24/1998 -- 1383 3506 -2123 <50 - <0 5 <0 5 <0 5 <0 5 162 -- No FP,No S 9/21/1998 -- 1383 3867 -2484 131 - <0 5 <0 5 115 167 262 - No FP,No S 12/14/1998 -- 1383 3661 -2278 136 1 08 <0 5 <0 5 <0 5 291 - No FP,No S 3131/1999 -- 1383 3385 -2002 <50 - <05 <0 5 <0 5 <0 5 796 -- No FP,No S 6/11/1999 -- 1383 3347 -1964 194 - <0 5 <0 5 <0 5 <0 5 41 - No FP,No S 9/10/1999 - 1383 3772 -2389 213 148 <0 5 <0 5 <0 5 1,100 -- No FP,No S 12/3/1999 1383 3764 -2381 641 -- <0 5 <0 5 <0 5 <0 5 731 -- No FP,No S 4/3/2000 - 1383 3430 -2047 <50 - <05 <0 5 <0 5 <0 5 166 -- No FP,No S 6/22/2000 - 1383 34 37 -20 54 232 - <20 <2 0 1 <2 0 1 <2 0 2,070[4] -- No FP,No S Report Date January 18,2005 Page 4 of 12