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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) (Ug1L) (pgll-) (pglL) (pg/L) (pg/L) (trglL) (vg/L) (mg/L) Comments <br /> ATR-10 12/16/1994 — 4807 997 3810 <50 — <0 5 <0 5 <05 <0 5 -- — <br /> 2/28/1995 - 4807 1015 3792 <50 -- <05 <0 5 <0 5 <0 5 -- - <br /> 4/25/1995 -- 4807 1027 3780 <50 -- <0 5 <0 5 <05 <05 - <br /> 7/27/1995 — 4807 1038 3769 — _ __ — __ _ <br /> 10/26/1995 - 4807 1041 3766 — — -- — — — <br /> 2/12/1996 - 4807 1001 3806 <50 -- <05 <0 5 <0 5 <05 - — <br /> 4/18/1996 -- 4807 1023 3784 -- — — — _ <br /> 7/18/1996 — 4807 1040 3767 <50 - <0 5 <0 5 <05 <0 5 <5 — <br /> 11/15/1996 -- 4807 1093 3714 -- — -- -- — _ _ — <br /> 3/14/1997 — 4807 -- -- <br /> 6/4/1997 - 4807 -- -- -- — — -- .- — — _. <br /> 8/11/1997 NP 4807 1056 3751 <50 — <05 <0 5 <0 5 <05 <2 5 <br /> 11/17/1997 -- 4807 1047 3760 -- - — — _ — — <br /> 3/30/1998 NP 4807 1005 3802 <50 <0 5 <0 5 <05 <0 5 <50 23 <br /> 6/25/1998 — 4807 1025 3782 -- -- -- — — -- — -- <br /> 9/11/1998 NP 4807 1035 3772 <50 <0 5 <0 5 <0 5 <0 5 <2 5 143 <br /> 12/15/1998 -- 4807 1021 3786 -- — -- -- -- — -- 06 <br /> 3!1711999 NP 4807 1011 3796 <50 — <0 5 <0 5 <0 5 <0 5 <5 0 1 3 <br /> 5/14/1999 — 4807 1031 3776 -- -- -- -- -- — -- 17 <br /> 9/16/1999 NP 4807 1044 3763 <50 — <0 5 <0 5 <0 5 <0 5 <5 0 39 <br /> 12/22/1999 -- 4807 1035 3772 -- -- -- — _- _- __ 1 54 <br /> 2/29/2000 NP 4807 1003 3804 <50 -- <0 5 <0 5 <0 5 <0 5 <2 5 51 <br /> 6/7/2000 NP 4807 1035 3772 -- — -- _ __ _ — <br /> 9/25/2000 NP 4807 1045 3762 <50 -- <0 5 <0 5 <0 5 <0 5 <2 5 06 <br /> 12/2112000 -- 4807 1030 3777 -- — -- -- — — -- 71 <br /> 3/27/2001 P 4807 1022 3785 <50 0 — <0 500 <0 500 <0 500 <0 500 <2 00" 23 <br /> 6/20/2001 - 4807 1081 3726 -- -- -- -- _ _ _ <br /> 9/12/2001 — 4807 -- — — - -- - -- - - — Well inaccessible <br /> 12/19/2001 4807 - -- — _ -- — Well inaccessible <br /> 3/14/2002 -- 4807 -- — — -- — __ _ _ _ Well inaccessible <br /> 6/28/2002 - 4807 <br /> 9/11/2002 4807 -- — _ _ __ _ _ _ — Well inaccessible <br /> 12/17/2002 - 4807 <br /> Report Date May 6,2004 Page 19 of 25 <br />