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i 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 msl) (feet bgs) (feet msl) (pgll-) (pg/L) (pg/L) (pglL) (pg/L) (pglL) (pgll-) (mg/L) Comments <br /> ATR-5 03/31/2003 P — 1011 — <50 -- <0 50 <0 50 <0 50 <0 50 11* 3 9 <br /> 06/09/2003 P - 1016 <50 -- <0 50 <0 50 <0 50 <0 50 31* 4 9 <br /> 09/18/2003 P — 1035 — 53 R - <25 <2 5 <2 5 <25 59* 1 9 <br /> 12/24/2003 P -- 1020 -- 91 - <10 <1 0 <1 0 <1 0 j 57* 18 <br /> 03/12/2004 P 1972 1017 955 <50 <0 50 <0 50 <0 50 <0 50 16* 32 <br /> 06101/2004 P 1972 1024 9 48 54 -- <0 50 <0 50 <0 50 <0 50 11* 25 <br /> ATR-6 3/10/1989 — 4935 -- -- <200 — <05 <05 <0 5 <0 5 — -- <br /> 6/21/1989 — 4935 11 54 3781 <50 — <03 <03 <03 03 — -- <br /> 9/18/1989 -- 4935 1160 3775 <50 — 05 13 03 38 -- — <br /> 12/27/1989 -- 4935 1157 3778 <50 - <03 <03 <03 04 - — <br /> 4/18/1990 4935 1168 3767 <50 — 19 24 06 5 — -- <br /> 10/16/1990 -- 4935 -- -- <50 -- <05 <05 <0 5 <0 5 -- — <br /> 10/19/1990 4935 11 80 3755 — — -- -- — — _ w <br /> 1/10/1991 -- 4935 11 64 3771 <50 - <05 <0 5 <05 <0 5 - <br /> 4/10/1991 -- 4935 11 52 3783 <50 <0 5 <0 5 <0 5 <0 5 <br /> 7/10/1991 — 4935 1176 3759 <50 — <0 5 <0 5 <0 5 <0 5 — -- <br /> 9/24/1991 — 4935 1195 3740 <50 — <05 <0 5 <0 5 <0 5 — - <br /> 1/23/1992 — 4935 1166 3769 <50 — <0 5 <0 5 <0 5 <0 5 -- <br /> 4/20/1992 4935 1156 3779 -- -- -- -- — — -- <br /> 4/2111992 4935 -- -- <50 — <0 5 <0 5 <0 5 <0 5 - -- <br /> 7/8/1992 4935 11 72 3763 <50 - <0 5 <05 <0 5 <0 5 — — <br /> 10/7/1992 -- 4935 11 82 3753 <50 -- <05 <05 <0 5 <0 5 - <br /> 1/18/1993 4935 1104 3831 <50 - <05 <05 <0 5 <0 5 — - <br /> 4/14/1993 4935 11 42 3793 310 75 <0 5 <0 5 <0 5 -- — <br /> 8/31/1993 - 4935 -- — — — -- _- -- <br /> 10127/1993 -- 4935 1184 3751 <50 <05 <0 5 <0 5 <0 5 — <br /> 2/17/1994 4935 -- -- -- -- -- -- -- _ — <br /> 5/20/1994 4935 — -- - - -- -- _ _ <br /> 10/7/1994 - 4935 11 85 3750 <50 -- <05 <05 <0 5 <0 5 - <br /> 12/16/1994 -- 4935 11 54 3781 <50 - <05 <0 5 <0 5 <0 5 - <br /> 2/28/1995 -- 4935 11 65 3770 <50 <05 <0 5 <0 5 <0 5 — <br /> 4/26/1995 - 49,35 - <br /> 7/27/1995 4935 — -- -- - -- __ <br /> Report Date July 15,2004 Page 11 of 26 <br />