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• i • <br /> 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 Bate P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (ugIL) (pglL) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments <br /> ATR-7 2/1211996 — 4965 1195 3770 <50 -- <0 5 <05 <0 5 <0 5 -- — <br /> 4/18/1996 — 4965 1235 3730 <50 -- <05 <0 5 <0 5 <0 5 — <br /> 7/18/1996 -- 4965 1245 3720 <50 -- <05 <0 5 <0 5 <0 5 28 - <br /> 11/15/1996 — 4965 1311 3654 <50 1 — <05 <0 5 <0 5 <0 5 120 -- <br /> 3/14/1997 -- 4965 1320 3645 <50 — <05 <0 5 <05 <0 5 63 01 <br /> 6/4/1997 NP 4965 1244 3721 <50 — <05 <05 <0 5 <05 <25 013 <br /> 8/11/1997 NP 4965 1272 3693 <50 — <05 <05 <0 5 <0 5 22 -- <br /> 11/17/1997 NP 4965 1266 3699 <50 -- <05 <05 <0 5 <0 5 35 -- <br /> 3/30/1998 NP 4965 1211 3754 <50 -- <05 <0 5 <0 5 <0 5 <50 13 <br /> 6/25/1998 NP 4965 1246 3719 <50 — <0 5 <0 5 <0 5 <0 5 <50 25 <br /> 9/11/1998 NP 4965 1251 3714 1 <50 — <0 5 1 <0 5 <0 5 <05 <2 5 114 <br /> 12/15/1998 NP 4965 1241 3724 <50 -- <05 <05 <05 <05 <5 0 22 <br /> 3/17/1999 NP 4965 1223 3742 <50 — <05 <05 <0 5 <05 <50 2 <br /> 5/14/1999 NP 4965 1241 3724 <50 -- <05 <05 <0 5 <05 <5 0 1 9 <br /> 9/16/1999 NP 4965 1258 3707 <50 -- <05 <05 <0 5 <0 5 <50 36 <br /> 12/22/1999 NP 4965 1252 3713 <50 — <05 <0 5 <0 5 <0 5 <2 50 42 <br /> 2/29/2000 NP 4965 1206 3759 <50 — <05 <05 <0 5 <0 5 <2 50 47 <br /> 6/7/2000 NP 4965 1255 3710 <50 -- <05 <05 <0 5 <0 5 572 -- <br /> 9/25/2000 NP 4965 1271 3694 <50 -- <0 5 <05 <0 5 <0 5 <2 50 05 <br /> 12/29/2000 P 4965 1243 3722 <50 0 — <0 500 <0 500 <0 500 0 656 17 5* 67 <br /> 3/27/2001 P 4965 1233 3732 <50 0 -- <0 500 <0 500 <0 500 <0 500 305* 38 <br /> 6/20/2001 P 4965 1247 37 18 1 <50 — <0 50 <0 50 <050 <0 50 580* — <br /> 9/12/2001 P 4965 1250 3715 <50 — <0 50 <0 50 <050 <0 50 140 12 <br /> 12/19/2001 P 4965 1235 3730 <50 -- <0 50 <0 50 <0 50 <0 50 7 2* 101 <br /> 3/14/2002 P 4965 1242 3723 <50 -- <0 50 <0 50 <0 50 <0 50 14* 066 <br /> 6/28/2002 P 1 4965 1248 3717 <50 -- <05 1 <0 5 <0 5 <0 5 0 97* 36 <br /> 9/11/2002 P 4965 1244 3721 <50 — <05 <05 <0 5 <0 5 1 1* 29 <br /> 12/17/2002 P 4965 1196 3769 <50 — <05 <05 <0 5 <0 5 <0 5* 39 <br /> 03/31/2003 P 4965 1237 3728 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 28 <br /> 06/09/2003 P 4965 1234 3731 <50 -- <0 50 <050 <0 50 <0 50 <0 50* 30 <br /> 09/18/2003 P 4965 1252 3713 <50 — <050 <0 50 <0 50 <0 50 1 <0 50* 38 <br /> 12/24/2003 P 4965 1240 3725 <50 — <0 50 <0 50 <0 50 <0 50 I <0 50* 34 <br /> 03/12/2004 P 2144 1253 891 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 20 <br /> Report Date July 15,2004 Page 14 of 26 <br />