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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California Street, Stockton, CA TQC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DD Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg1L) (pg/L) (pg1L) (uglL) (pg1L) (pg/L) (pg1L) (mg/L) Comments VW-1A 12/21/2004 P 14 60 -- - — - - - -- - -- — Insufficient Water,Not Sampled 03/30/2005 -- 1460 -- -- — — — — — — — — Well Dry,Not Sampled 0611312005 — 1460 — — -- -- -- — — — — Insufficient Water,Not Sam pled VW-1 B 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 3/1612001 -- 14 60 3717 -2257 <50 -� <0 5 <0 5 <0 5 <05 21 0[4] — No FP,No S 6/21/2001 -- 14 60 3986 -2526 <50 — <0 5 <05 <0 5 <0 5 94[4] — No FP,No S 09/13/2001 — 1460 4569 -3109 <500 — <50 <50 <5 0 <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 -- 14 60 4217 -2757 190[7] -- <0 50 <0 50 <0 50 <0 50 320]4] — No FP,No S 9/12/2002 — 1460 4905 -3445 1 1,200 -- <10 I <10 <10 <10 590 — No FP,No S 12/3/2002 — 14 60 4615 -3155 <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 06/09/2003 P 1460 4362 -2902 <250 — <2 5 <2 5 <25 <25 860[4] 290 09/17/2003 P 1460 5113 -3653 240 R — <12 <12 <12 <12 540[4] 158 12/11/2003 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 06/17/2004 P 1459 4792 1 -3333 160 -- <10 <10 <10 <10 620[4] 190 09/23/2004 P 14 59 54 20 -39 61 510 — 89 <5 0 79 16 360[4] 10 12/21/2004 P 14 59 4860 -3401 800 -- <50 <50 <50 <50 2,000[4] 1 15 03/30/2005 P 1459 4457 -2998 <50 -- <0 50 <0 50 <0 50 <0 50 15[4] 297 05/13/2005 P 1459 4245 .2786 1 <50 — <050 <0 50 <0 50 <0 50 18[4] 187 VW-2A 10/19/2000 - 1492 3622 -21 30 NS — NS NS NS NS NS -- No FP,No S 12/20/2000 - 1492 3623 -2131 NS — NS NS NS NS NS — No FP,No S 3/16/2001 -- 1492 3624 -2132 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 611912002 - 1492 1 3692 -2200 NS -- NS NS NS NS NS — No FP,No S Report Date July 21,2005 Page 8 of 13