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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tracy Boulevard Tracy Calffomia Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Dale Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) M1BE DO Number Sampled (11 MSL) (ft TOG) (R,MSL) Change(ft) (1t) (p91L) (/rg1L) OWL (pg/L) 419/L) mglL ATR-11 8/25/1991 4684 - - - <50 <0 5 <0 5 <0 5 <0 5 - - 9/24/1991 950 3734 - - - - -- - - 9/25/1991 -- - <50 <0 5 <0 5 <0 5 <0 5 -1/23/1992 895 3789 - - <50 <0 5 <0 5 <0 5 <0 5 - 4/20/1992 878 3806 017 » - - - - - 4/21/1992 - - -- <50 <0 5 <O 5 <0 5 <0 5 - - 7/8/1992 912 3772 -- - <50 <0 5 <0 5 <0 5 <0 5 - - 1017/1992 930 3754 018 - <50 <0 5 <0 5 <0 5 <0 5 -1/18/1993 780 3904 150 - <50 <0 5 <0 5 <0 5 <0 5 - - 4/14/1993 847 3837 -067 - <50 <0 5 <0 5 <0 5 <0 5 8/31/1993 938 3746 091 - <50 <0 5 <0 5 <0 5 <0 5 - 10/27/1993 931 3753 007 -- <50 <0 5 <0 5 <0 5 <0 5 - - 2/18/1994 883 3801 04B <10 08 10 <0 3 06 - - 5/20/1994 893 3791 010 - <10 <0 3 <0 3 <0 3 <0 5 - - 10/7/1994 934 3750 -041 - <50 <0 5 <0 5 <0 5 <0 5 - - 12/16/1994 891 3793 043 - <50 <0 5 <0 5 <0 5 <0 5 - 2/28/1995 885 3799 006 - <50 <0 5 <0 5 <0 5 <0 5 4/25/1995 911 3773 026 - <50 <0 5 <0 5 <0 5 c0 5 - — 7/27/1995 943 3741 -032 — - — — — — 10/26/1995 959 3725 016 — — — — — — — — 2/12/1996 842 3842 1 17 - <50 <0 5 <0 5 <0 5 <0 5 - - 4/18/1996 903 3781 061 - - - _ _ _ 7/18/1996 945 3739 042 - <50 <0 5 <0 5 <0 5 <0 5 <5 0 - 11/15/1996 995 3689 -050 - - - - - - 3/1411997 NP 986 3698 009 - <50 <0 5 <0 5 <O 5 <0 5 - 015 6/4/1997 924 3760 062 - - -- - -- -- -- 0 oa 8/11/1997 NP 963 3721 -039 <50 <0 5 <0 5 <O 5 <0 5 <2 5 11/17/1997 947 3737 016 - - - - - - 3130/1998 NP 866 3818 081 <50 <0 5 <0 5 <0 5 <0 5 <5 0 is 6/25/1998 992 3692 -1 26 - - - -- - - - . 9/11/1998 P 940 3744 052 <60 <0 5 <0 5 <0 5 <0 5 <2 5 161 12/15/1998 919 3765 021 1 1 3/17/1999 P 896 37 88 023 - <50 <0 5 0 821 <0 5 <0 5 <5 0 37 5/14/1999 920 3887 099 - - - - - 280 9/16/1999 P 952 3855 032 <50 <0 5 <0 5 <O 5 <0 5 <5 0 34 12/12/1999 932 3752 103 — — — — — — 044 2/29/2000 P 860 3824 072 — 114 <0 5 0 678 <0 5 1 63 <2 5 32 617!2000 NP 935 3749 075 -- -- -- — -- — — 9/25/2000 NP 1021 3663 086 — <50 <0 5 <0 5 <0 5 <0 5 893 05 12/21/2000 915 3769 1 06 — - - — — — — 45 3/2712001 P 906 3778 009 <50 0 <O 500 <0 500 <0 500 <0 500 Q 00' 37 6/20/2001 925 3759 019 — - — — — — — — 9/12/2001 P 1031 3653 106 <50 <0 50 <0 50 <0 50 <0 50 <2 5 16 12/19/2001 914 3770 1 17 - — — — -- — — 3/14/2002 P 918 3766 004 — <50 <0 50 <0 50 <0 50 <0 50 <2 5 160 6/28/2002 - -- -- - — -. _. — — 9/11/2002 P 942 3742 - <50 <0 5 <0 5 <0 5 <0 5 <O 5` 20 12/17/2002 -- - - - -- -- - - 3/31/2003 P 910 3774 - <50 <0 5 <0 5 <0 5 <0 5 <0 5' 1 9 6/9/2003 909 3776 002 Not Sampled 9/1812003 P 938 3746 030 <50 <0 5 <0 5 <0 5 <0 5 <0 5' 1 9 1212412003 925 3759 -013 - Not Sampled h:%VVVW�u5 BP rwcrn020"QUanwhn4 ant 03UM 0WIVIrt 4a03 Pagc 1i of 14