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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 /> TQC 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 msl) (feet bgs) (feet msl) (pg/L) (pg1L) (pg1L) (pg/L) (pg1L) (pg/L) (pg1L) (mg/L) Comments <br /> ATR-7 8/11/1997 NP 4965 1272 3693 <50 -- <0 5 <0 5 <0 5 <05 22 - <br /> 11/17/1997 NP 4965 1266 3699 <50 — <0 5 <0 5 <05 <05 35 — <br /> 3/30/1998 NP 4965 1211 3754 <50 -- <0 5 <0 5 <05 <0 5 <50 13 <br /> 6/25/1998 NP 4965 1246 3719 <50 -- <0 5 <0 5 <05 <0 5 <50 25 <br /> 9/11/1998 NP 4965 1251 3714 <50 — <0 5 <0 5 <0 5 <0 5 <2 5 114 <br /> 12/15/1998 NP 4965 1241 3724 <50 -- <0 5 <0 5 <0 5 <0 5 <5 0 22 <br /> 3/17/1999 NP 4965 1223 3742 <50 -- <0 5 <0 5 <0 5 <0 5 <5 0 2 <br /> 511 411 99 9 NP 4965 1241 3724 <50 — <0 5 <0 5 <0 5 <0 5 <5 0 1 9 <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 3713 <50 -- <0 5 <0 5 <05 <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 <0 5 <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 4965 1233 3732 <50 0 — <0 500 <0 500 <0 500 <0 500 305* 38 <br /> 6/20/2001 P 4965 1247 3718 <50 — <0 50 <0 50 <0 50 <0 50 580* -- <br /> 9/12/2001 P 4965 1250 3715 <50 <0 50 <0 50 <0 50 <0 50 140 1 2 <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 4965 1248 3717 <50 -- <0 5 <0 5 <0 5 <0 5 0 97* 36 <br /> 9/11/2002 P 4965 1244 3721 <50 -- <0 5 <05 <0 5 <0 5 1 1* 29 <br /> 12/17/2002 P 4965 1196 3769 <50 -- <0 5 <0 5 <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 <0 50 <0 50 <0 50 <0 50* 30 <br /> 09/1 81200 3 P 4965 1252 3713 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 38 <br /> 12/24/2003 P 4965 1240 3725 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 34 <br /> 03112/2004 P 2144 1253 891 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 20 <br /> ATR-8 8/25/1991 — 4598 — -- 2,700 -- 110 <0 5 130 98 — — <br /> 9/25/1991 -- 4598 885 3713 1 400 -- 95 <0 5 51 97 —1/2311992 -- 4598 829 3769 <50 -- 25 <0 5 <0 5 <0 5 — — <br /> 4/20/1992 -- 4598 811 3787 -- — — — — — — -- <br /> 4/21/1992 -- 4598 -- -- 140 -- 14 09 14 93 — — <br /> 7/8/1992 - 4598 848 37 50 87 — 4 <0 5 92 08 — -- <br /> Report Date May 6,2004 Page 14 of 25 <br />