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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 PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pg/L) (pg1L) (pg/L) (pg/L) (pg/L) 019/L) (mgIL) Comments MW-7 9/12/2002 -- 1397 4856 -3459 <50 -- <0 5 <0 5 <05 <0 5 <0 5 - No FP,No S 12/3/2002 — 1397 4547 -3150 <50 — <0 5 <0 5 <05 12 <0 5 -- No FP,No S 03/11/2003 P 1397 4583 -3186 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 359 06/09/2003 P 1397 4291 -2894 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 564 09/17/2003 P 1397 51 19 -3722 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 096 12/11/2003 P 1397 4567 -3170 <50 - <0 50 <0 50 <0 50 <0 50 <0 50[4] -- 03/1012004 P 1391 4194 -31117 <50 — <0 50 <0 50 <0 50 <0 50 <0 50[4] 101 VW-1A 10/19/2000 1460 3635 -2175 NS - NS NS NS NS NS -- No FP,No S 12/20/2000 - 1460 3642 -21 82 NS — NS NS NS NS NS -- No FP,No S 3/16/2001 — 1460 3647 -2187 NS — NS NS NS NS NS — No FP,No S 6/21/2001 -- 1460 3642 -2182 NS - NS NS NS NS NS — No FP,No S 9/13/2001 - 1460 3640 -2180 NS — NS NS NS NS NS — No FP,No S 12/11/2001 -- 1460 3641 -21 81 NS -- NS NS NS NS NS — No FP,No S 3/14/2002 — 1460 3644 -2184 NS — NS NS NS NS NS — No FP,No S 6/19/2002 - 1460 3647 -2187 NS -- NS NS NS NS NS -- No FP,No S 9/12/2002 — 1460 — — NS — NS NS NS NS NS — No FP,No S 12/3/2002 — 1460 -- -- NS - NS NS NS NS NS -- No FP,No S 03111/2003 -- 1460 — -- -- — -- -- -- - — — Well Dry 06/09/2003 — 1460 — -- -- -- -- -- -- -- -- -- Well Dry 09/17/2003 -- 1460 — -- -- — -- -- -- -- -- -- Well Dry 12/11/2003 — 1460 — — - — — - -- -- -- -- Not Sampled 03/1012004 — 1460 — — — — — _- — — — — Not Sampled VW-IB 10/19/2000 -- 1460 4016 -2556 NS NS NS NS NS NS -- No FP,No S 12/20/2000 -- 1460 3825 -2365 NS -- NS NS NS NS NS — No FP,No S 3/16/2001 - 1460 3717 -2257 <50 — <0 5 <0 5 <0 5 <0 5 21 0[4] -- No FP,No S 6/21/2001 — 1460 3986 -2526 <50 -- <0 5 <0 5 <0 5 <0 5 94[4] — No FP,No S 09/13/2001 1460 4569 -3109 <500 — <5 0 <5 0 <50 <50 1,100[4] — [8], No FP,No S 12/11/2001 -- 1460 4300 -2840 200[7] -- 69 2 2 8 1,700[4] — No FP,No S 3/14/2002 - 1460 3993 -2533 <50 -- <0 50 <0 50 <0 50 <0 50 63[4] -- No FP,No S 6/19/2002 1460 4217 -2757 190[7] -- <0 50 <0 50 <0 50 <0 50 320[4] — No FP,No S 9/12/2002 — 1460 490 5 -3445 1,200 -- <10 <10 <10 <10 590 — No FP,No S 12/3/2002 — 1460 4615 -31 55 <1,000 -- <10 <10 <10 24 260 — No FP, No S 03/11/2003 P 1460 1681 -221 <5,000 -- <50 <50 <50 <50 2,400[4]J 096 Report Date May 5,2004 Page 6 of 10