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Page 13 of 17 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Boulevard,Tracy,CA <br /> Weft Depth Groundwater Groundwater Product Ethyl- Xylenes <br /> Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO <br /> Number Sampled (ft,MSL) (ft,TOC) (ft MSL) Change(ft (11) (ug/L) (u /L) (ugfL (ug/ (u /L) (ug/L) (mg/L) <br /> ATR 10 11/17/1997 1047 37 60 009 — _ .- _ <br /> (cont) 3/30/1998 NP 1005 3802 042 <50 <05 <0 5 <0 5 <0 5 <5 0 2 3 <br /> 6/25/1998 1025 3782 020 — <br /> 9/11/1998 NP 1035 3772 010 <50 <05 <0 5 <0 5 <05 <25 1 43 <br /> 12/15/1998 1021 $766 014 -- — 0 6 <br /> 3/1 711 999 NP 1011 3796 010 <50 <0 5 <0 5 <0 5 <0 5 <5 0 1 3 <br /> 5114/1999 1031 3776 020 — -- -- -- — 1 7 <br /> 911611999 NP 1044 3763 0 13 <50 <0 5 <0 5 <0 5 <0 5 <5 0 3 9 <br /> 12/22/1999 1036 3772 009 -- — 154 <br /> 212912000 NP 1003 3804 032 <50 <0 5 <0 5 <0 5 <0 5 <25 51 <br /> 6/7/2000 NP 1035 3772 0 32 -- <br /> 9/25/2000 NP 1045 3762 010 <50 <0 5 <0 5 <05 <0 5 <25 0 6 <br /> 12/21/2000 1030 3777 015 — — 71 <br /> 3/27/2001 P 1022 3785 008 <50 0 <0 500 <0 500 <0 500 <0 500 <2 00 2 3 <br /> 6/20/2001 1081 3726 059 <br /> 9/12/2001 Well inaccessible <br /> 12/19/2001 Well inaccessible <br /> 3/14/2002 Well inaccessible <br /> 6/28/2002 _ <br /> 9/11/2002 Well inaccessible <br /> 12/17/2002 -. <br /> -3/31/2003 P 1012 37 95 — <50 <0 5 <0 5 <0 5 <0 5 <05 1 5 <br /> 6/9/2003 1015 3792 -0 03 Not Sampled <br /> i <br /> ATR 11 8/25/1991 46 64 — <50 <0 5 <0 5 <0 5 <0 5 <br /> 9/24/1991 9 50 3734 — — _ <br /> 9/25/1991 — <50 <0 5 <0 5 <0 5 <0 5 <br /> 1/23/1992 895 3789 <50 <0 5 <0 5 <0 5 <0 5 <br /> 4/20/1992 8 78 3806 0 17 — — .- _ <br /> 4121/1992 <50 <0 5 <0 5 <0 5 <0 5 — <br /> 7/8/1992 912 3772 <50 <0 5 <0 5 <0 5 <0 5 » <br /> 10/7/1992 9 30 3754 -018 <50 <0 5 <0 5 <0 5 <0 5 — <br /> 1/18/1993 780 3904 1 50 — <50 <0 5 <0 5 <0 5 <0 5 <br /> 4/14/1993 847 3837 0 67 — <50 <0 5 <0 5 <0 5 <0 5 <br /> 8/31/1993 938 37 46 0 91 <50 <0 5 <0 5 <0 5 <0 5 — <br /> 10/27/1993 9 31 37 53 0 07 — <50 <0 5 <0 5 <0 5 <0 5 — <br /> 2/18/1994 883 38 01 0 48 <10 0 6 1 0 <0 3 0 6 <br /> 5/20/1994 8 93 3791 010 <10 <0 3 <0 3 <0 3 <0 5 <br /> 10/7/1994 934 3750 041 <50 <0 5 <0 5 <0 5 <0 5 <br /> 12/16/1994 8 91 3793 043 <50 <05 <0 5 <05 <0 5 <br /> 2/28/1995 885 3799 006 <50 <0 5 <0 5 <0 5 <05 <br /> 4/25/1995 911 3773 0 26 <50 <05 <0 5 <0 5 <05 <br /> 7/27/1995 943 3741 0 32 — — — <br /> 10/26/1995 959 .3725 016 — <br /> 2/12/1996 842 3842 1 17 — <50 <0 5 <0 5 <0 5 <0 5 <br /> 4/18/1996 9 03 3781 061 — <br /> 7/18/1996 945 3739 042 <50 <0 5 <0 5 <0 5 <0 5 <5 0 <br /> 11115!1996 995 3689 050 - -- — <br /> K%W;rw—iW-1 BP MCO0Y083kQmtsrW OTR 0018083 0 WMR 2003 <br />