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4 _ <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) (pg/L) (pg/L) (4/1-) (pg/L) (pg/L) (pgll-) (pg/L) (mg/L) Comments <br /> ATR-11 9/11/1998 P 4684 940 3744 <50 - <05 <0 5 <0 5 <0 5 <2 5 161 <br /> 12/15/1998 - 4684 919 3765 - - -- -- - - -- 1 1 <br /> 3/17/1999 P 4684 896 3788 <50 -- <0 5 0 821 <0 5 <0 5 <50 37 <br /> 5/14/1999 -- 4684 920 3764 - -- - - - - -- 28 <br /> 9/16/1999 P 4684 952 3732 <50 - <0 5 <05 <0 5 <0 5 <50 34 <br /> 12/22/1999 -- 4684 932 3752 - -- -- - - -- -- 044 <br /> 2/29/2000 P 4684 860 3824 114 - <05 0 678 <05 163 <2 5 32 <br /> 6/7/2000 NP 4684 935 3749 -- - -- - - -- -- - <br /> 9/25/200D NP 4684 1021 3663 <50 - <05 <0 5 <0 5 <D 5 893 05 <br /> 12121/2000 - 46 84 915 3769 - -- - - -- -- - 45 <br /> 3/27/2001 P 4684 906 3778 <50 0 -- <0 500 <0 500 <0 500 <0 500 <2 00* 37 <br /> 6/20/2001 - 4684 925 3759 - -- - - - -- - - <br /> 9/12/2001 P 4684 1031 3653 <50 - <0 50 <0 50 <0 50 <0 50 <25 16 <br /> 12/19/2001 - 4684 914 3770 - -- -- - - - -- - <br /> 3/14/2002 P 4684 918 3766 <50 -- <0 50 <0 50 <0 50 <0 50 <2 5 1 6 <br /> 6/28/2002 -- 4684 - - - - - -- - -- -- -- <br /> 9/11/2002 P 4684 942 3742 <50 - <0 5 <0 5 <0 5 <0 5 <0 5* 2 <br /> 12/17/2002 -- 4684 - - I - - -- - - -- -- - <br /> 03/31/2003 P 4684 910 3774 <50 - <0 50 <0 50 <0 50 <0 50 <0 50* 19 <br /> 06/09/2003 -- 4684 908 3776 -- - -- - - -- -- - <br /> 09118/2003 P 4684 938 3746 <50 - <0 50 <0 50 <0 50 <0 50 <0 50* 1 9 <br /> 12/24/2003 - 4684 925 3759 - -- - - -- - - - <br /> 0 311 2120 04 P 18 64 903 961 <50 - <0 50 <0 50 <0 50 <0 50 <0 50* 13 <br /> 06/01/2004 - 1864 931 933 -- - - - - -- - - Not Sampled <br /> 09/20/2004 - 1864 940 924 - - - -- - - - -- Not Sampled <br /> 1211312004 -- 1864 932 932 1 -- - -- -- - - - - Not Sampled <br /> ATR-12 10/16/1990 - 4708 - -- <50 - <05 <0 5 <0 5 <0 5 - - <br /> 10/19I1990 -- 4708 933 3775 -- - - - - - --1/10/1991 - 4708 916 3792 <50 - <0 5 <05 <0 5 <0 5 -- - <br /> 4110/1991 -- 4708 898 3810 <50 - <05 <05 <0 5 <0 5 - -- <br /> 7/12/1991 - 4708 928 3780 <50 - <05 <05 <0 5 <0 5 -- - <br /> 9/24/1991 - 4708 9 5237 56 - - -- - I - -- - - <br /> 9/25/1991 - 4708 -- - <50 - <05 <0 5 <0 5 <05 - - <br /> Report Date February 22,2005 -- m �— Page 22 of 27 <br />