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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 msi) (ug/L) (pg1L) WIL) (gg1L) (Lfg/L) (mg/L) (mg/L) Comments <br /> ATR-8 4/15/1993 -- 4598 — -- 110 — 42 <05 4 6 49 -- -- <br /> 8/31/1993 — 4598 981 3617 700 -- 15 15 41 71 -- — <br /> 10/27/1993 -- 4598 8 68 3730 52,000 — 620 2100 2,800 8,700 - — <br /> 2/17/1994 — 4598 825 3784 -- -- -- -- _ — __ ^ 0 14 ft tree product <br /> present <br /> 5/20/1994 -- 4598 855 3754 - — -- — -- — ^,014 ft free product <br /> present <br /> 108/1994 -- 4598 870 3738 — -- — -- — - 0 14 ft free product <br /> present <br /> 12/16/1994 — 4598 821 3777 -- — — -- — — - -- Sheen <br /> 2/28/1995 — 45 98 845 3755 — — -- -- - — — — ^ 0 02 ft free product <br /> present <br /> 4/26/1995 -- 45 98 8 51 3786 — — -- -- — — — — ^,0 5 ft free product <br /> present <br /> 7/27/1995 — 4598 985 3622 - - — -- .- -- -- A.0 12 ft free product <br /> present <br /> 10/26/1995 — 4598 9 28 3672 -- — — — -- - — -- ^,0 03 ft free product <br /> present <br /> 2/12/1996 — 45 98 787 3813 — -- -- — — -- — — ^,0 02 ft free product <br /> present <br /> 4/18/1996 — 4598 845 37 55 — - -- — — -- — — 1A,0 02 ft free product <br /> present <br /> 7/18/1996 - 45 98 895 3703 88 000 — 72 220 620 2,500 <500 -- <br /> 11/15/1996 -- 45 98 940 36 58 52,000 — 110 130 240 1,300 <200 — <br /> 3/14/1997 -- 4598 924 3674 350 — 4 2 <05 16 26 <2 5 0 1 <br /> 6/4/1997 NP 45 98 869 3729 1200 - 42 5 2 8 2 150 <2 5 003 <br /> 8/11/1997 NP 4598 910 36 88 7,800 - 280 75 140 710 <25 — <br /> 11/17/1997 NP 4598 — -- 4200 — 57 <05 <0 5 250 <2 5 — <br /> 3/30/1998 NP 45 98 802 37 96 320 -- 17 <0 5 <0 5 24 <5 0/<2 0* 0 8 <br /> 6/25/1998 NP 4598 969 3629 876 - 30 19 871 176 <50 1 4 <br /> 9/11/1998 -- 4598 -- -- -- — — — -- — -- — Well paved over <br /> 1 2/1 511 998 NP 4611 886 3725 456 -- 102 069 6 12 809 <50 0 7 <br /> 3/17/1999 NP 4611 8 55 3756 130 — 212 0 528 2 12 271 <50 2 5 <br /> 5/14/1999 NP 4611 881 37 30 155 — 1 79 <0 5 241 2 <50 42 <br /> 9/16/1999 NP 4611 917 3694 747 — 278 142 9 88 8 4 <50 18 <br /> 112/2211999 NP 4611 7 99 38 12 648 -- <0 5 0 586 585 536 <2 50 0 31 <br /> Report Date March 21,2005 Page 16 of 27 <br />