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J Table 1 J Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California, 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 msi) (pg1L) (pg/L) (pg/L) (pg/L) WIL) (pg/L) (pg/L) (mg/L) Comments VW-1 B 06/09/2003 P 1460 4362 -2902 <250 — <2 5 <2 5 <2 5 <2 5 860[4] 29 09/17/2003 P 1460 51 13 -3653 240 R -- <12 <12 <12 <12 540[4] 158 12!1112003 P 1460 4670 -3210 85 R — <50 <50 <50 <5 0 130[4] — 03/10/2004 P 1460 4695 -3235 640 -- <50 <50 <50 <50 2,000[4] 166 VW-2A 10/19/2000 1492 3622 -21 30 NS — NS NS NS NS NS — No FP,No S 12!2012000 1492 3623 -2131 NS -- NS NS NS NS NS — No FP,No S 3/16/2001 — 1492 3624 -21 32 NS — NS NS NS NS NS - No FP,No S 6/21/2001 -- 1492 3621 -2129 NS -- NS NS NS NS NS - No FP No S 9/13/2001 1492 3695 -2203 NS - NS NS NS NS NS — No FP,No S 12/11/2001 — 1492 3695 -2203 NS - NS NS NS NS NS -- No FP,No S 3/14/2002 — 1492 3694 -2202 NS — NS NS NS NS NS No FP No S 6/19/2002 1492 3692 -2200 NS NS NS NS NS NS - No FP,No S 9/12/2002 -- 1492 — -- NS - NS NS NS NS NS -- No FP No S 12!312002 -- 1492 -- -- NS — NS NS NS NS NS — No FP,No S 03/11/2003 — 1492 -- -- - - -- -- -- -- Not Sampled 06/09/2003 - 1492 — - - - — - — Well Dry 09/17/2003 -- 1492 -- -- - - __ __ __ _ -- Well Dry 12/11/2003 -- 1492 -- — - - -- - -- - -- -- Not Sampled 03/10/2004 -- 1492 -- -- -- -- -- -- -- — — -- Not Sampled VW-28 10/19/2000 -- 1492 4040 -2548 NS -- NS NS NS NS NS -- No FP,No S 12/20/2000 — 1492 3851 -2359 NS -- NS NS NS NS NS No FP,No S 3/16/2001 -- 1492 3745 -2253 <50 -- <0 5 <0 5 <0 5 <0 5 57 3[4] No FP,No S 6/21/2001 - 1492 4012 -2520 <50 — 053 <0 5 072 <0 5 780[4] — No FP,No S 09/13/2001 1492 4588 -3096 250[7] -- 1 1 <0 5 <0 5 <0 5 2,400[4] -- [8],No FP,No S 12/11/2001 -- 1492 4323 -2831 73[7] -- 12 <0 50 <0 50 <0 50 450[4] - No FP, No S 3/14/2002 1492 4020 -2528 <50 — <0 50 <0 50 <0 50 <0 50 320[4] — No FP, No S 6/19/2002 1492 4243 -2751 <50 - <0 50 <0 50 <0 50 <0 50 320[4] No FP No S 9/12/2002 - 1492 4931 -3439 400 - <2 5 <2 5 <2 5 <2 5 210 No FP,No S 12/3/2002 — 1492 4643 -31 51 <500 -- <50 <50 <50 <5 0 98 No FP,No S 03/11/2003 P 1492 4636 -3144 <1,000 — <10 <10 <10 <10 530[4] 101 06/09/2003 P 1492 4315 -2823 <250 <25 <2 5 <2 5 <2 5 810[4] 296 09/17/2003 P 1492 51 32 -3640 150 R <50 <5 0 <5 0 <5 0 90[4] 1 96 12111/2003 P 1492 4621 -31 29 120 R -- <2 5 <2 5 <2 5 <2 5 170141 -- Report Date May 5,2004 Page 7 of 10 I