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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California Street, 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 msi) (feet bgs) (feet msl) (pg1L) (pg/L) (pg1L) (ugIL) (pg/L) (pg/L) (pglL) (mg1L) Comments VW-2A 03/3012005 — 1487 -- — -- — — -- — -- -- Well Dry,Not Sampled VW-213 10/19/2000 — 1492 4040 -25 48 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 — <05 <0 5 <0 5 <05 573141 — No FP No S 6/21/2001 -- 14 92 4012 -2520 <50 — 053 <05 072 <05 780[4] -- No FP,No S 09/13/2001 -- 14 92 4588 -3096 250[7] -- 11 <0 5 <0 5 <0 5 2,400[4] — [8],No FP,No S 12/11/2001 — 14 92 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 49 31 -3439 400 — <2 5 <2 5 <2 5 <2 5 210 — No FP,No S 12/3/2002 -- 1492 4643 -3151 <500 — <50 <50 <50 <50 98 -- No FP,No S 03111/2003 P 1492 4636 -3144 <1 000 — <10 <10 <10 <10 530[4] 101 06/09/2003 P 1492 4315 -2823 <250 -- <2 5 <25 <2 5 <2 5 810[4] 296 09/17/2003 P 14 92 51 32 -3640 150 R — <50 <50 <50 <5 0 90[4] 196 12/11/2003 P 1492 4621 -3129 120 R -- <25 <25 <2 5 <2 5 170[4] -- 03/10/2004 P 1492 4651 -3159 <50 -- <0 50 <050 <0 50 <0 50 <0 50[4] 151 06/17/2004 P 1489 4813 -3324 71 — <2 5 <2 5 <2 5 <2 5 210[4) 0 9 09/23/2004 P 1489 5425 -3936 220 88 16 15 35 79[4] 12 12/21/2004 P 1489 4880 -3391 1,300 -- 16 120 <12 320 460[4) 029 03130/2005 P 1489 45 10 -30 21 120 — <1 0 <1 0 <1 0 <1 0 43[4] 334 VW-3A 10/19/2000 -- 1502 3600 -2098 NS -- NS NS NS NS NS -- No FP,No S 12/20/2000 -- 1502 3605 -21 03 NS — NS NS NS NS NS — No FP,No S 3/16/2001 — 1502 3600 -2098 NS — NS NS NS NS NS -- No FP,No S 6/21/2001 1502 3604 -2102 NS -- NS NS NS NS NS — No FP,No S 9/13/2001 -- 1502 3610 -2108 NS - NS NS NS NS NS -- No FP,No S 12/11/2001 — 1502 3585 -2083 NS — NS NS NS NS NS — No FP,No S 3/14/2002 - 1502 3589 -2087 NS -- NS NS NS NS NS -- No FP,No S 6/19/2002 -- 1502 3590 -2088 NS NS NS NS NS NS — No FP,No S 9/12/2002 -- 1502 -- — NS -- NS NS NS NS NS -- No FP,No S 12/3/2002 -- 1502 3585 -2083 NS - NS NS NS NS NS -- No FP,No S 03/1112003 -- 1502 -- -- — — -- -- — — — -- Not Sampled 06/09/2003 -- 1502 — — -- -- -- — -- — Well Dry Report Date April 25,2005 Page 9 of 12