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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> 3425 Tracy Blvd, Tracy, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet ms!) (feet bgs) (feet msl) (pg/L) (pg/L) (pg/L) (pg1L) (pg/L) (pg/L) (pg/L) (mg1L) Comments <br /> ATR-2 4/25/1995 — 4922 1195 3727 <50 — <05 <0 5 <0 5 <0 5 — -- <br /> 7/27/1995 -- 4922 1291 3631 <50 -- <0 5 <0 5 <0 5 <0 5 — — <br /> 10/26/1995 — 4922 1226 3696 <50 — <0 5 <05 <0 5 <0 5 -- -- <br /> 2112/1996 - 4922 1140 3782 <50 — <05 <05 <0 5 <0 5 -- -- <br /> 4/18/1996 4922 11 90 3732 <250 -- <2 5 <25 <2 5 <2 5 — — <br /> 7/18/1996 — 4922 1210 3712 <50 — <0 5 <0 5 <0 5 <0 5 500 <br /> 11/15/1996 -- 4922 1270 36 52 <50 -- <0 5 <0 5 <0 5 <0 5 750 — <br /> 3/1411997 P 49 22 1270 3652 <50 - <0 5 <0 5 <0 5 <0 5 280 008 <br /> 6/4/1997 NP 4922 1202 3720 1 <50 064 <0 5 <0 5 <0 5 480 006 <br /> 8/11/1997 P 4922 1233 3689 <50 <0 5 <0 5 <0 5 <0 5 1 440 <br /> 11/1711997 P 49 22 1226 3696 <50 — <05 <0 5 <0 5 <0 5 98 -- <br /> 3/30/1998 NP 4922 11 82 3740 <50 -- <0 5 <0 5 <0 5 <05 18/20* 12 <br /> 6/25/1998 NP 4922 1205 3717 <50 — <05 <05 <0 5 <0 5 109 1 6 <br /> 9/11/1998 NP 4922 1212 3710 <50 - <05 <05 <0 5 <0 5 250 167 <br /> 12/15/1998 NP 4922 1201 3721 <50 — <05 <05 <0 5 <0 5 <50 1 5 <br /> 3/17/1999 NP 4922 1165 3757 <50 -- <05 <0 5 <0 5 <0 5 <50 23 <br /> 5/14/1999 NP 1 4922 1205 3717 <50 -- <05 <0 5 <0 5 <0 5 <50 19 <br /> 9116/1999 NP 4922 1223 3699 <50 — <05 <0 5 <05 <0 5 <50 37 <br /> 12/22/1999 NP 4922 1214 3708 <50 — <05 <05 <05 <0 5 <2 50 743 <br /> 2/29/2000 NP 4922 1150 3772 <50 — <05 <0 5 <05 <0 5 483 51 <br /> 6f712000 NP 4922 1211 3711 <50 — <05 <0 5 <05 <0 5 126 -- <br /> 9/25/2000 NP 4922 1211 3711 <50 — <05 <0 5 <0 5 <0 5 141 0 3 <br /> 12/29/2000 P 4922 1203 3719 <50 0 -- <0 500 <0 500 <0 500 <0 500 89* 56 <br /> 3/2712001 P 4922 11 92 3730 <50 0 -- <0 500 <0 500 <0 500 <0 500 37 2* 41 <br /> 6/2012001 P 4922 1203 3719 <50 -- <0 50 <0 50 <0 50 <0 50 96* — <br /> 911212001 P 4922 1218 3704 <500 -- <50 <50 <50 <50 500 2 9 <br /> 12/19/2001 P 49 22 1197 3725 <500 -- <50 <50 <50 <50 250* 082 <br /> 3/14/2002 P 4922 1200 3722 <500 — <50 <50 <50 <50 98* 082 <br /> 6/28/2002 P 4922 1212 1 3710 170 - <05 1 <0 5 <0 5 <0 5 300* 1 5 <br /> 9/11/2002 P 4922 1210 3712 54 - <0 5 <0 5 <0 5 <0 5 110* 19 <br /> 12/1712002 P 4922 1144 3778 <50 -- <05 <0 5 <0 5 <0 5 16* 14 <br /> 03/31/2003 P 4922 1220 3702 <50 -- <0 50 <0 50 <0 50 <0 50 5 0' 14 <br /> 06/09/2003 P 4922 1192 3730 <50 -- <0 50 <0 50 <0 50 <0 50 5 4* 17 <br /> Report Date March 21, 2005 Page 4 of 27 <br />