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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 Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet ms]) (feet bgs) (feet msl) (pg/L) (pglL) (pg/L) (pglL) (pg1L) (pg1L) (pg/L) (mg1L) Comments <br /> ATR-7 4/14/1993 — 4965 1175 3790 -- — — -- — -- -- - <br /> 4/15/1993 — 4965 -- -- <50 — 29 <05 <0 5 <05 -- — <br /> 8/31/1993 — 4965 1224 3741 <50 — <05 <05 <0 5 <0 5 -- -- <br /> 10/27/1993 — 4965 1223 3742 <50 — <0 5 <05 <0 5 1 3 — — <br /> 2/18/1994 -- 4965 1193 3772 <10 — <03 <03 <0 3 <0 5 — — <br /> 5/20/1994 — 4965 1200 3765 <10 -- <0 3 <03 <0 3 <0 5 -- -- <br /> 10/7/1994 -- 4965 1223 3742 <50 — <05 <05 <0 5 <0 5 — — <br /> 12/16/1994 -- 4965 11 94 3771 1 <50 -- <05 <0 5 <0 5 <0 5 -- — <br /> 2/28/1995 -- 4965 1200 3765 <50 — <05 <0 5 <0 5 <05. — — <br /> 4/25/1995 - 4965 1241 3724 <50 — <0 5 <0 5 <0 5 <0 5 - <br /> 7/27/1995 - 4965 1261 3704 <50 — <0 5 <0 5 <0 5 <0 5 -- — <br /> 10/26/1995 -- 4965 1267 3698 <50 -- <0 5 <0 5 <0 5 <0 5 — -- <br /> 2/12/1996 -- 4965 1195 3770 <50 -- <05 <0 5 <0 5 <0 5 — — <br /> 4/18/1996 4965 1235 3730 <50 -- <0 5 <0 5 <05 <0 5 -- -- <br /> 7/18/1996 — 4965 1245 3720 <50 — <05 <0 5 <0 5 <0 5 28 - <br /> 11/15/1996 -- 4965 13 11 3654 <50 -- <0 5 <0 5 <0 5 <0 5 120 -- <br /> 3/14/1997 — 4965 1320 3645 <50 -- <0 5 <0 5 <0 5 <0 5 63 01 <br /> 6/4/1997 NP 4965 1244 3721 <50 — <05 <0 5 <0 5 <0 5 <25 013 <br /> 8111!1997 NP 4965 1272 3693 <50 — <05 <0 5 <05 <0 5 22 — <br /> 11/17/1997 NP 4965 1266 3699 <50 -- <0 5 <05 <05 <0 5 35 -- <br /> 3/30/1998 NP 4965 1211 3754 <50 -- <0 5 <05 <0 5 <0 5 <50 13 <br /> 6/25/1998 NP 4965 1246 3719 <50 — <05 <0 5 <0 5 <0 5 <50 25 <br /> 9/11/1998 NP 4965 1251 3714 <50 -- <0 5 <05 <0 5 <0 5 <2 5 114 <br /> 12/15/1998 NP 4965 1241 3724 <50 1 -- <05 <0 5 <0 5 <0 5 <50 22 <br /> 3/17/1999 NP 4965 1223 3742 <50 — <05 <05 <0 5 <0 5 <50 2 <br /> 5/14/1999 NP 4965 1241 3724 <50 <0 5 <0 5 <0 5 <0 5 <50 19 <br /> 9/16/1999 NP 4965 1258 3707 <50 <0 5 <05 <0 5 <0 5 <50 36 <br /> 12/22/1999 NP 4965 1252 37 13 <50 - <0 5 <0 5 <0 5 <0 5 <2 50 42 <br /> 2/29/2000 NP 4965 1206 3759 <50 — <0 5 <0 5 <0 5 <0 5 <2 50 47 <br /> 6/7/2000 NP 4965 1255 3710 <50 - <0 5 <0 5 <05 <0 5 572 -- <br /> 9/25/2000 NP 4965 1271 3694 <50 - <0 5 <0 5 <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 1 4965 1233 1 3732 <50 0 — <0 500 1 <0 500 <0 500 <0 500 1 305' 3 8 <br /> Report Date January 18,2005 Page 14 of 27 <br />