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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tracy Boulevard Tracy Califomla Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC ft MSL) Change(ft) ft (Frg/L) (yg/L) (mg/l.) (P9/L) (pg/L 4ww rn ATR-12 10/16/1990 4708 - - - <50 <0 5 <0 5 <0 5 <05 - - 10/19/1990 933 3775 -- -- - _ -- - - 1/10/1991 916 3792 017 <50 <0 5 <0 5 <0 5 <0 5 - - 4/10/1991 898 3810 018 <50 <0 5 <0 5 <0 5 <0 5 - - 7/12/1991 928 3780 -030 <50 <0 5 <0 5 <0 5 <0 5 - 9/24/1991 952 3756 -024 -- -- -- - - - 9/25/1991 - -- -- - <50 <O 5 <O 5 <0 5 <0 5 - 1/'23/1992 906 3802 -- - <50 <0 5 <0 5 <0 5 <0 5 - - 4/20/1992 900 3808 006 - - - - -- 4/21/1992 - - _ <50 <0 5 <0 5 <O 5 <0 5 7/8/1992 921 3787 -- <50 <0 5 <0 5 <0 5 <0 5 - 10/7/1992 932 3776 -011 <50 <0 5 <05 <0 5 <05 » 1/18/1993 832 3876 100 <50 <0 5 <05 <0 5 <0 5 — 4/14/1993 8 79 3829 -0 47 <60 <0 5 <0 5 <0 5 <0 5 - - 8/31/1993 9 39 3769 -060 <50 <O 5 <0 5 <0 5 <0 5 - - 10/27/1993 9 36 3772 003 <50 <05 <05 <0 5 <0 5 - - 2/18/1994 902 3806 034 <10 04 O 5 <0 3 <0 5 - 5/20/1994 9 06 3802 -004 <10 <0 3 <0 3 <0 3 <0 5 - - 10/7/1994 - - - - - - - - - - - 12/16/1994 — — — — — — 2/28/1995 — » 4/25/1995 — — — — — 4f26/1995 — — — — — — — — 7/27/1995 — — 10/26/1995 — — — — — — i 2/12/1996 885 3823 -- <50 <0 5 <0 5 <0 5 <0 5 — 4/18/1996 922 3786 -0 37 <50 <0 5 <0 5 <05 <0 5 — 7/18/1996 9 53 3755 -031 <60 <05 <0 5 <0 5 <0 5 <5 0 -- 11 115/1996 1000 3708 -047 <50 <0 5 <0 5 <0 5 <0 5 <5 0 — 3/14/1997 NP 1011 3697 -011 <50 <0 5 <0 5 <0 5 <0 5 009 . 6/4/1997 NP 934 3774 077 <50 <0 5 <0 5 <0 5 <0 5 <2 5 012 8/11/1997 NP 9 67 3741 -0 33 <50 <0 5 <0 5 <0 5 <0 5 <2 5 11/17/1997 NP 954 3754 013 <50 <05 <0 5 <0 5 <0 5 <2 5 3/30/1998 NP 8 96 3812 0 58 <50 <0 5 <0 5 <0 5 <0 5 <50 21 6/25/1998 NP 935 3773 -0 39 <50 <05 <0 5 <0 5 <0 5 <5 0 32 9/11/1998 NP 947 3761 -012 <50 <0 5 <0 5 <0 5 <O 5 <2 5 126 12/15/1998 NP 9 31 3777 016 <50 <0 5 <0 5 <0 5 <O 5 <5 O 2 8 3/17/1999 NP 916 3792 015 <50 <05 <0 5 <0 5 <0 5 <50 1 8 5/14/1999 NP 9 33 3775 017 — <50 <0 5 <0 5 <0 5 <0 5 <50 2 0 9/16/1999 NP 955 3753 -022 <50 <0 5 <0 5 <0 5 <0 5 <50 37 12/22/1999 NP 942 3766 013 <50 <05 <0 5 <0 5 <0 5 <2 5 083 2/2912000 NP 8 93 3815 049 — <50 <0 5 <0 5 <0 5 <O 5 <2 5 57 6/7/2000 Well Inaccessible 9/2512000 Well inaccessible 12/21/2000 Well inaccessible 3/27!2001 P 926 3782 -033 <50 0 <0 5 <0 5 <0 5 <0 5 <2 0' 2 3 6/20/2001 P 9 96 3712 -070 — <50 <0 5 <0 5 <0 5 <O 5 <2 0• 9/12/2001 P 938 3770 058 <50 <05 <0 5 <0 5 <0 5 <2 5 2 0 12/19/2001 P 928 3780 010 -- <50 <0 5 <0 5 <0 5 <0 5 <2 0' 232 3/14/2002 P 929 3779 -001 — <50 <0 5 <O 5 <0 5 <0 5 <0 5 184 6/28/2002 P 943 3766 -014 — <50 <05 <0 5 <0 5 <0 5 <0 5` 45 9/11!2002 P 938 3770 005 — <50 <0 5 <0 5 <0 5 <0 5 <0 5' 33 12/17/2002 P 8713 3830 060 <50 <0 5 <0 5 <0 5 <0 5 "05. 42 3/31/2003' P 930 3778 -052 — <50 <0 5 <0 5 <0 5 <0 5 <0 5' 21 6/9/2003 P 928 3780 002 <50 <0 5 <05 <0 5 <0 5 <0 5` 29 9/18!2003 P 950 3758 -022 <50 <0 5 <0 5 <0 5 <0 5 <0 5' 2 5 12/24/2003 P 930 3778 020 — <50 <0 5 <0 5 <0.5 <05 <0 5" 20 K lwprocesaU5 BP ARC010200MQUartmM4 QTF3 0312093 GWMR 4003 Page 12 of 14