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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 P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg/L) (pgli-) (pg1L) (pg/L) (pg/L) (pg/L) UMIL) (mg/L) Comments <br /> ATR-2 4/23/1987 -- 4922 1128 3794 <100 <0 5 06 <05 <0 5 -- -- <br /> 12/22/1987 - 4922 1140 3782 — — <0 5 <0 5 <0 5 <0 5 — -- <br /> 3/24/1988 - 4922 1135 3787 -- — <0 5 <0 5 <0 5 <0 5 — - <br /> 6/23/1988 — 4922 1155 3767 -- -- <0 5 <0 5 <0 5 <0 5 -- - <br /> 9/29/1988 4922 1171 3751 -- -- <0 5 <0 5 <0 5 <0 5 -- — <br /> 2/22/1989 - 4922 1135 3787 370 — 1 8 07 06 34 -- — <br /> 6/21/1989 — 4922 1145 3777 <50 -- 1 9 <0 3 04 <0 3 -- -- <br /> 9/18/1989 - 4922 1165 3757 9 — 1 9 09 1 1 82 -- — <br /> 12/27/1989 -- 4922 1150 3772 <50 — 35 <0 3 1 1 03 -- — <br /> 4/18/1990 -- 4922 1164 3758 50 — 29 <0 3 <03 <0 3 — - <br /> 10/16/1990 4922 1181 3741 <50 -- <0 5 <0 5 <05 <0 5 -- - <br /> 10/19/1990 4922 1181 3741 — -- — -- -- — -- - <br /> 1/10/1991 4922 1158 3764 <50 -- 08 <0 5 <05 <0 5 -- — <br /> 4/10/1991 — 4922 11 35 3787 <50 -- <0 5 <0 5 <0 5 <0 5 — — <br /> 7/10/1991 -- 4922 11 74 3748 <50 — <0 5 <0 5 <0 5 <0 5 — <br /> 9/24/1991 - 4922 1202 3720 <50 -- <0 5 <0 5 <0 5 <0 5 — — <br /> 1/23/1992 4922 1160 3762 <50 — <0 5 <0 5 <0 5 <05 — -- <br /> 4/20/1992 4922 1153 3769 <50 -- <0 5 <0 5 <0 5 <0 5 -- - <br /> 7/8/1992 4922 11 75 3747 <50 28 <0 5 <0 5 <0 5 -- <br /> 10/7/1992 4922 11 83 3739 59 -- 57 <0 5 <0 5 <0 5 — -- <br /> 1/18/1993 -- 4922 -- -- -- — — — -- -- <br /> 4/1411993 4922 1129 3793 55 38 07 08 19 - -- <br /> 8/30/1993 4922 1196 3726 <50 - <0 5 <0 5 <0 5 <0 5 -- -- <br /> 10/27/1993 — 4922 11 95 3727 <50 — <0 5 <0 5 <0 5 <0 5 - -- <br /> 2/18/1994 - 4922 11 54 3768 <10 - 07 09 <0 3 07 — -- <br /> 5/20/1994 -- 4922 1161 3761 <10 — 09 <0 3 <0 3 <0 5 -- <br /> 10/7/1994 4922 11 93 3729 <50 — <0 5 <0 5 <0 5 <0 5 - - <br /> 12/16/1994 -- 4922 1156 3766 <50 -- <0 5 <0 5 <0 5 <0 5 - -- <br /> 2128/1995 - 4922 1160 3762 <50 - <0 5 <0 5 <0 5 <0 5 - <br /> 4/25/1995 — 4922 11 95 3727 <50 <0 5 <0 5 <0 5 <0 5 - - <br /> 7/27/1995 4922 1291 3631 <50 - <0 5 <0 5 <0 5 <0 5 - - <br /> 10/261199511 4922 1226 3696 <50 <0 5 <0 5 <0 5 <0 5 - - <br /> 2/12/1996 4922 1140 3782 <50 <0 5 <0 5 <0 5 <0 5 - -- <br /> i <br /> Report Date May 6,2004 Page 3 of 25 <br />