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i • • Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet b9s) (feet msl) (pg/L) (pg/L) (pg/L) (,uglL) (pg/L) (pg/L) (P9/L) (mg/L) Comments MW-3 3/16/2001 -- 1455 3703 -2248 <50 -- <0 5 <0 5 <0 5 <0 5 <2 0[4] -- No FP,No S 6/21/2001 – 1455 3970 -2515 <50 – <0 5 <0 5 <0 5 <0 5 <2 0[4] – No FP,No S I 9/13/2001 -- 1455 4540 -3085 <50 – <0 5 <0 5 <05 <0 5 <2 0[4] -- No FP,No S 12/11/2001 – 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 41 97 -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 <05 <0 5 <0 5 <0 5 – No FP,No S 12/3/2002 -- 1455 4597 -3142 <50 – <0 5 <0 5 <05 <0 5 <0 5 – No FP,No S 03/1112003 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 <0 50 <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 12/11/2003 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 — MW-4 11/20/1997 -- 1383 4836 -3453 89 -- 1 1 1 063 2 11 – No FP,No S 2/17/1998 1383 4355 -2972 180 – 057 <0 5 <05 059 29 – No FP,No S 6/24/1998 – 1383 3506 -21 23 <50 – <0 5 <0 5 <05 <0 5 162 – No FP,No S 9/21/1998 - 1383 3867 -2484 131 <0 5 <0 5 1 15 167 262 -- No FP,No S 12/14/1998 – 1383 3661 -2278 136 – 108 <0 5 <05 <0 5 291 -- No FP,No S 3/31/1999 - 1383 3385 -2002 <50 -- <0 5 <0 5 <05 <0 5 796 -- No FP,No S 6/1111999 -- 1383 3347 -1964 194 -- <0 5 <05 <05 <0 5 41 – No FP, No S 9/10/1999 – 1383 3772 -2389 213 – 148 <0 5 <05 <0 5 1 100 -- No FP No S 12/3/1999 -- 1383 3764 -2381 641 – <0 5 <0 5 <05 <0 5 731 -- No FP,No S 4/3/2000 -- 1383 3430 -2047 <50 – <05 <0 5 <05 <0 5 166 – No FP,No S 6/22/2000 - 1383 3437 -2054 232 – <20 <2 0 <20 <2 0 2,070[4] – No FP,No S 9/27/2000 - 1383 3980 -2597 185 – 16 <0 5 0 542 1 17 6,590[4] -- No FP No S 10/19/2000 – 1383 3959 -2576 NA – NA NA NA NA NA – Not observed 12/20/2000 – 1383 3768 -2385 <50 – <0 5 <0 5 <0 5 <0 5 1,170 – No FP,No S 3/16/2001 – 1383 3650 -2267 <50 – <0 5 <0 5 <0 5 <0 5 481(4] -- No FP,No S 6/21/2001 -- 1383 3937 -2554 <50 – <0 5 <0 5 <0 5 <0 5 590[4] – No FP,No S 9/13/2001 – 1383 4512 -31 29 150 – <0 5 <0 5 <0 5 <0 5 7,600[4] – No FP,No S 12/11/2001 – 13 83 4243 -2860 84[7] – <0 50 <0 50 <0 50 <0 50 5,600[4] -- No FP,No S 3/14/2002 – 1383 3926 -2543 88[7] -- <0 50 <0 50 <0 50 <0 50 4,900[4] -- No FP,No S 6119/2002 – 1383 4146 -2763 540[7] – <0 50 <0 50 <0 50 <0 50 2,900[4] – No FP,No S Report Date May 5,2004 Page 4 of 10