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T' i Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tracy Boulevard Tracy,California - - - Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPNg Benzene Toluene benzene (total) MIIBE DO Number Sampled (ft,MSL) (ft,TOC) (ft,MSL) Change(ft) (ft) (y9/L) (RW (419/0 (pg/L) WIL) W9,L) (mg/L) ATR-6 3/10/1989 49 35 -- - _ - <200 <0 5 <0 5 <0 5 <0 5 - 6/21/1989 11 54 3781 -- <50 <0 3 <0 3 <0 3 0 3 - 9/18/1989 11 60 3775 -0 06 » <50 0 5 1 3 0 3 38 - - 12127/1989 11 57 37 78 003 - <50 <03 <0 3 <0 3 0 4 -- - 4/18/1990 11 68 3767 -011 - <50 19 24 06 5 0 - 10/16/1990 - -- - - <50 <0 5 <0 5 <0 5 <0 5 - 10/19/1990 11 80 3755 - » - _ _ - _ - _ 1/10/1991 11 64 3771 016 <50 <0 5 <0 5 <0 5 <0 5 4/10/1991 11 52 3783 012 - <50 <0 5 <0 5 <0 5 <0 5 - 7/10/1991 11 76 3759 024 - <50 <0 5 <0 5 <0 5 <0 5 - - 9/24/1991 11 95 3740 019 <50 <0 5 <0 5 <0 5 <0 5 - 1/23/1992 1166 9769 029 - <50 <0 5 <0 5 <0 5 <0 5 - 4/20/1992 11 56 3779 010 - - - - _ _ _ 4/21/1992 - - - <50 <0 5 <0 5 <0 5 <0 5 - 7/8/1992 11 72 3763 - - <50 <0 5 <0 5 <0 5 <0 5 - - 10/7/1992 1182 3753 -010 <50 <0 5 <0 5 <0 5 <0 5 - - 1/18/1993 11 04 3831 078 <50 <0 5 <0 5 <0 5 <0 5 » - 4/14/1993 1142 3793 -0 38 - 310 75 <0 5 <0 5 <0 5 - » 8/31/1993 10/27/1993 11 84 3751 - <50 <0 5 <0 5 <0 5 <0 5 - 2/17/1994 - - - - _ _ - 5/20/1994 - » - - - - - 10!711994 11 85 3750 - <50 <0 5 <0 5 <0 5 <0 5 - 12/16/1994 11 54 3781 0 31 - <50 <0 5 <0 5 <0 5 <0 5 - - 2128/1995 11 65 3770 Oil <50 <0 5 <0 5 <0 5 <0 5 » 4/26/1995 - - - _ _ - 7127/1 995 - - _ _ _ _ _ 10/26/1995 1218 3717 - <50 <0 5 <0 5 <0 5 <0 5 - - 2/12/1996 11 57 37 78 0 61 <50 <0 5 <0 5 <0 5 <0 5 - - 4/18/1996 11 9137 44 -0 34 - -- - _ _ _ _ 7/18/1996 1201 37 34 -010 <50 <0 5 <0 5 <0 5 <0 5 10 11/15/1996 1263 3672 -062 - - - » - - _ 3/14/1997 - - -- 6!4/1997 1201 3734 - » -- - - -- 014 8/11/1997 NP 1223 3712 022 - <50 <0 5 <0 5 <0 5 <0 5 56 -- 11/17/1997 1224 3711 0 01 -- - - - - - 3/30/1998 NP 11 69 3766 0 55 - <50 <0 5 <0 5 <0 5 <0 5 41 1 9 6/25/1998 11 97 37 38 -028 - - - -- - _ - 9/11/1998 NP 1208 3727 Oil - <50 <O 5 <0 5 <0 5 <0 5 <50 1 27 12/15/1998 11 95 3740 013 - - -- - - 09 3/17/1999 NP 1186 3749 009 - <50 <0 5 <0 5 <0 5 <0 5 <5 O 1 9 5/14/1999 1201 3734 -015 » - - - - - 2 4 9/16/1999 NP 1217 3718 -016 - <50 <0 5 <0 5 <0 5 <0 5 <5 0 5 3 12/22/1999 1206 3729 Oil - - - - -- - - 22 2/2912000 NP 1165 3770 0 41 - <50 <0 5 --05 <0 5 <0 5 107 5 0 6/7/2000 NP 1210 3725 -0 45 - - - - - - 9/25/2000 NP 1222 3713 012 - <50 <0 5 <0 5 <0 5 <0 5 <2 50 070 12/29/2000 1200 3735 022 - - - - - -- - 51 3/27/2001 P 11 93 3742 007 -- <50 0 <0 500 <0 500 <0 500 <0 500 52 V 41 6/20/2001 1204 3731 Oil - - _ _ _ 9/1212001 P 1203 3732 0 01 <60 <0 50 <0 50 <0 50 <0 50 12 1 8 12/19/2001 11 95 3740 008 - _ _ __ » _ _ 3/14/2002 P 11 97 3738 0 02 <50 <0 50 <0 50 <0 50 <0 50 1 8- 086 6/27/2002 - -- _ - -- - - - _ 9/11/2002 P 1200 3735 - <50 <0 5 <0 5 <0 5 <0 5 0 68' 1 4 12/17/2002 -- - - - _ _ _ _ _ _ 3/31/2003' P 11 92 3743 -- - <50 <0 5 <0 5 <0 5 <0 5 1 2 0 9 6/9/2003 11 62 37 73 0 30 Not Sampled 9/1 812 0 03 P 1210 3725 048 - <50 <0 5 <0 5 <0 5 <0 5 it* 1 1 12/24/2003 1193 3742 -017 - Not Sampled K.'OCM J5 BP AFIM020931Quartert A4 QTR 0312093 UNIVR 4003 Page 6 of 14