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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msi) (pg/L) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (pg/L) (mglL) Comments VW-2B 03/10/2004 P 1492 4651 -3159 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[4] 151 VW-3A 10/19/2000 -- 1502 3600 -2098 NS — NS NS NS NS NS -- No FP, No S 12/20/2000 - 1502 3605 -2103 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 -21 02 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 03/11/2003 — 1502 -- — - - - -- - -- Not Sampled 06/09/2003 -- 1502 — - _ __ w .. — — — Well Dry 09/17/2003 -- 1502 -- -- __ _ __ _ _ _ _ — Well Dry 12/11/2003 — 1502 - — - — — — — — — — Not Sampled 03/10/2004 -- 1502 — — — — — — -- — — — Not Sampled VW-38 5/23/1996 -- 1501 4576 -3075 290 — <0 5 <05 <05 <0 5 <3 0 — No FP,No S 9/19/1996 — 1501 5402 -3901 310 — <0 5 <0 5 <0 5 <0 5 <3 0 -- No FP,No S 11/27/1996 - 1501 51 15 -3614 280 — <0 5 <0 5 <0 5 <0 5 <3 0 — No FP,No S 3/21/1997 — 1501 4249 -2748 180 — <0 5 <05 <0 5 <0 5 <3 0 -- No FP,No S 5/22/1997 - 1501 44 28 -2927 240 -- <0 5 <05 <05 <05 <30 -- No FP,No S 8/20/1997 — 1501 5021 -3520 200 — <0 5 <0 5 <0 5 <05 <50 — No FP,No S 11/20/1997 -- 1501 4946 -3445 160 -- 46 44 26 67 <50 -- No FP,No S 2/17/1998 — 1501 4472 -2971 93 — <0 5 <05 <0 5 <0 5 <50 — No FP,No S 6/24/1998 -- 1501 3628 -2127 <50 — <0 5 <05 <0 5 <05 <50 — No FP,No S 9/21/1998 -- 1501 3969 -2468 227 -- 456 <0 5 222 324 159 -- No FP,No S 12/14/1998 — 1501 3790 -2289 571 — <0 5 <0 5 <0 5 105 <50 — No FP,No S 3/31/1999 — 1501 3581 -2080 <50 — <0 5 <0 5 <0 5 <0 5 <5 0 — No FP,No S 6/11/1999 — 1501 3460 -1959 152 — 19 <0 5 699 162 186 — No FP,No S 9/10/1999 -- 1501 3877 -2376 1,210 -- 546 <0 5 545 137 1,590 -- No FP,No S 12/3/1999 -- 15 01 3876 -2375 804 -- <0 5 <05 <0 5 <0 5 149 -- No FP,No S 4/3/2000 -- 1501 3545 -2044 <50 -- 338 <0 5 186 562 296 — No FP,No S 6/22/2000 — 1501 3551 -2050 1,690 -- 848 384 227 432 3,18014] — No FP,No S Report Date May 5,2004 Page 8 of 10