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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) (pglL) Cpg/L) WL) (E►g1L) (pg/L) (Erg/L) W/L) (mglL) Comments <br /> ATR-4 12/24/2003 P — 1074 — <50 — <0 50 <0 50 <0 50 <0 50 <0 50' 25 <br /> 03112/2004 P 2041 1068 973 <50 -- 14 <0 50 <0 50 35 <0 50' 36 <br /> ATR-5 3/10/1989 -- 4873 -- -- 6 600 -- 693 <5 0 327 7 — — <br /> 6/29/1989 — 4873 1052 3821 2,200 — 490 24 280 13 — — <br /> 9/18//1989 — 4873 1098 3775 1,000 — 68 1 1 63 58 — — <br /> 12/27/1989 — 4873 1076 3797 2200 — 94 2 150 <1 — — <br /> 4/18/1990 — 4873 1090 3783 1,900 — 120 26 68 140 <br /> 10/16/1990 -- 4873 -- -- 1,000 — 18 47 79 16 — — <br /> 10/19/1990 -- 4873 11 10 3763 — — — — -- _ <br /> 1/10/1991 -- 4873 1084 3789 350 — 71 12 16 26 <br /> 4/10/1991 -- 4873 1067 3806 370 — 4.6 <0 5 7 <0 5 — <br /> 7/10/1991 -- 4873 11 02 3771 1,200 — 95 <0 5 18 15 _ <br /> 9/24/1991 — 4873 1129 3744 <50 -- <05 <0 5 <0 5 <0 5 _ <br /> 1/23/1992 - 4873 1078 3795 180 — 14 15 1 5 <0 5 _ -- <br /> 4/20/1992 — 4873 1070 3803 -- — -- -- -- — -- _ <br /> 4/21/1992 -- 4873 — _ 290 _ 16 1 <0 5 2 <0 5 <br /> 7/8/1992 — 4873 1097 3776 240 — <0 5 <0 5 06 <0 5 - — <br /> 10/7/1992 -- 4873 11 11 3762 — _ _ _ _ _ <br /> 10/8/1992 — 4873 _ _ 160 _ <0 5 <05 <0 5 <0 5 <br /> 1/18/1993 -- 4873 994 3879 -- _ _ — _ _ <br /> 1/19/1993 -- 4873 _ -- 1,000 -- 25 <0 5 79 13 _ -- <br /> 4/14/1993 — 4873 1047 3826 — _ — — — — _ <br /> 4/15/1993 -- 4873 _ _ 810 _ 15 <05 83 09 --8131/1993 — 4873 1116 3757 80 — <0 5 <0 5 <05 <0 5 _ — <br /> 10/27/1993 -- 4873 11 11 3762 63 — <0 5 <05 <0 5 <0 5 -- -- <br /> 2/18/1994 - 4873 1073 3800 160 1 -- 3 5 1 1 4 — -- <br /> 5/20/1994 — 4873 1082 3791 600 -- <0 3 2 12 1 7 — — <br /> 10I711994 - 4873 11 14 3759 660 — <0 5 <05 <05 <0 5 -- — <br /> 12/16/1994 - 4873 1077 3796 410 -- 65 <0 5 <05 <0 5 — — <br /> 2/28/1995 4873 1080 3793 60 — <0 5 06 <05 <0 5 — — <br /> 4/26/1995 -- 4873 1104 3769 83 — <0 5 <0 5 <05 <0 5 -- — <br /> 7/27/1995 - 4873 1127 3746 58 — <0 5 <0 5 <0 5 1 2 _ _ <br /> 10/26/1995 — — 1051 — — — — — -- — _ -- (a) <br /> Report Date May 6,2004 Page 9 of 25 <br />