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P-9-13 of 16 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd Tracy CA Well Depth Groundwater Groundwater Product Ethyl Xylenes Well Date Elevation to Water Elevation Elevat= Thickness TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft MSL) (ft TOC) (ft MSL) Change(ft} (ft) (ppb) (ppb) (ppb) b) (ppb) (ppb) (m 1L ATR 11 716!1992 9 12 3772 <50 <0 5 <0 5 <0 5 <0 5 (cont) 10!711992 9 30 37 54 018 <50 <0 5 <0 5 <0 5 <0 5 — — 1/18/1993 780 3904 1 50 <50 <0 5 <0 5 <0 5 <0 5 4/14/1993 847 3837 0 67 <50 <0 5 <0 5 <0 5 <0 5 — 8/31/1993 9 38 3746 0 91 — <50 <0 5 <0 5 <0 5 <0 5 — — 10/27/1993 9 31 3753 007 <50 <0 5 <0 5 <0 5 <0 5 — 2/18/1994 883 3801 048 <10 0 8 1 <0 3 0 6 5120/1994 893 37 91 010 <10 <03 <0 3 <0 3 <0 5 10!7!1994 9 34 37 50 0 41 <50 <0 5 <0 5 <0 5 <0 5 — — 12/16/1994 8 91 3793 0 43 <50 <0 5 <0 5 <0 5 <0 5 2/28/1995 885 3799 0 06 <50 <0 5 <0 5 <0 5 <0 5 4/25/1995 9 It 3773 026 <50 <0 5 <0 5 <0 5 <0 5 7/27/1995 943 3741 032 — 10/26/1995 9 59 3726 016 — — 2/12/1996 842 38 42 1 17 <50 <0 5 <0 5 <0 5 <0 5 — — 4/18/1996 903 3781 0 61 — 7/1611996 945 37 39 0 42 <50 <0 5 <0 5 <0 5 <0 5 <5 11/15/1996 9 95 3689 0 50 — 3/14/1997 NP 9 86 3698 009 <50 <0 5 <0 5 <0 5 <0 5 015 6/411997 9 24 3760 062 -- — 008 6/11/1997 NP 9 63 37 21 0 39 <50 <0 5 <0 6 <0 5 <0 5 <2 5 — 11/17/1997 947 37 37 0 16 -- 3l30/1998 NP B 66 3816 0 81 <50 <0 5 <0 5 <0 5 <0 5 <5 0 1 5 6/25/1998 9 92 3692 1 26 — 9/11/1998 P 9 40 3744 0 52 <60 <0 5 <0 5 <0 5 <0 5 <2 5 1 61 12115/1998 919 37 65 021 1 1 3/17/1999 P 896 3788 023 — <50 <0 5 0 821 <0 5 <0 5 <5 0 3 7 5/14/1999 920 38 87 099 — 2 80 9/16/1999 P 9 52 3855 0 32 <50 <0 5 <0 5 <0 5 <0 5 <5 0 3 4 12122/1999 932 37 52 103 -- 044 2/29/2000 P 860 3824 0 72 114 <0 5 0 678 <0 5 1 63 <2 5 32 617/2000 NP 9 35 3749 075 _ 9/2512000 NP 1021 36 63 0 86 <50 <0 5 <0 5 <0 5 <0 5 893 0 5 12/21/2000 9 15 3769 1 06 — 4 5 3/27/2001 P 906 37 78 009 <50 0 <0 500 <0 500 <0 500 <0 500 <2 00' 3 7 6/20/2001925 37 59 -019 — — 9/12/2001 P 1031 36 53 1 06 <50 <0 50 <0 60 <0 50 <0 50 <2 5 1 6 12/19/2001 914 3770 1 17 — all 4/2002 P 9 18 3766 004 <50 <0 50 <0 50 <0 50 <0 50 <2 5 1 60 6/28/2002 _ 9/11/2002 P 942 37 42 -- — <50 <0 5 <0 5 <0 5 <0 5 <0 5` 2 0 ATR 12 10/16/1990 4708 — — <50 <0 5 <0 5 <0 5 <0 5 10/19/1990 9 33 3775 — — 1/1011991 916 37 92 017 — <50 0 5 <0 5 <0 5 <0 5 — — 4/10/1991 898 38 10 018 <60 <0 5 <0 5 <0 5 <0 5 — 7/12/1991 928 37 80 0 30 <50 <0 5 <0 5 <0 5 <0 5 91241`1991 952 3756 024 — — — _ K%A 9P AR0M020WQuartKW QTR 025Tabia 1_2 3 A.