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Page 15 o1 17 Table 1 Groundwater Eievatlon and Analytical Data ARCO Service Station#2093 3425 Tracy Boulevard Tracy CA Well Depih Groundwater Groundwater Product Ethyl- Xylenes Well Date E{evation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) ft TOC) (it MSL) Change(ft) (ft) (ug/L a /L) (ug/L) (ug/L) (u /L u /L) (mg1L) ATR 12 4/25/1995 — (cont) 4/26h 995 7/271$995 10/26/1995 -- — _ — _ — _ 2/12/1996 865 3823 <50 <05 <0 5 <0 5 <0 5 4/18/1996 922 3786 037 <50 <0 5 <0 5 <0 5 <0 5 -- 7/18/1996 953 3755 0 31 <50 <0 5 <0 5 <0 5 <0 5 <5 0 11/15/1996 1000 3708 047 <50 <0 5 <0 5 <0 5 <0 5 <5 0 3/1411997 NP 1011 36 97 Oil <50 <0 5 <0 5 <0 5 <0 5 -- 0 09 6/4/1997 NP 934 3774 0 77 <50 <0 5 <0 5 <0 5 <0 5 <2 5 012 8/11/1997 NP 967 3741 -033 <50 <0 5 <0 5 <0 5 <0 5 <2 5 -- 11/17/1997 NP 954 3754 013 <50 <0 5 <0 5 <0 5 <0 5 <2 5 3/30/1998 NP 896 38 12 0 58 <50 <0 5 <0 5 <0 5 <0 5 <5 0 21 6/25/1998 NP 935 3773 -039 — <50 <0 5 <0 5 <0 5 <0 5 <5 0 3 2 9/11/1998 NP 947 3761 012 <50 <0 5 <0 5 <0 5 <0 5 <2 5 1 26 12115/1998 NP 9 31 3777 016 <50 <05 <0 5 <0 5 <0 5 <5 0 2 8 3/17/1999 NP 916 3792 015 <50 <0 5 <0 5 <0 5 <05 <5 0 1 8 5/1411999 NP 9 33 3775 017 <50 <05 <0 5 <05 <0 5 <5 0 2 0 9/1611999 NP 9 55 3753 0 22 <50 <0 5 <0 5 <05 <0 5 <5 0 3 7 12/2211999 NP 9 42 3766 0 13 <50 <0 5 <0 5 <05 <0 5 <2 50 083 2!29/2000 NP 8 93 38 15 049 <50 <0 5 <0 5 <0 5 <0 5 <2 50 5 7 6/7/2000 Well inaccessible 9/25/2000 Well Inaccessible 12/21/2000 Well Inaccessible 3/27/2001 P 926 3782 033 — <50 0 <0 500 <0 500 <0 500 <0 500 <2 00 2 3 6/20/2001 P 9 96 3712 070 <50 <0 50 <0 50 <0 50 <0 50 <2 0' 9112!2001 P 938 37 70 0 58 — <50 <0 50 <0 50 <0 50 <0 50 <2 5 2 0 12/19/2001 P 928 3780 010 — <50 <0 50 <0 50 <0 50 <0 50 <2 0 232 3/14/2002 P 929 3779 0 01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 1 84 6/28/2002 P 943 3765 014 <50 <0 50 <0 50 <0 50 <0 50 <0 50 4 5 9/11/2002 P 938 3770 005 <50 <0 50 <0 50 <0 50 <0 50 <0 50 3 3 12/17/2002 P 878 3830 0 60 <50 <0 50 <0 50 <0 50 <0 50 <0 50 4 2 3131/2003 P 930 3776 052 <50 <0 50 <0 50 <0 50 <0 50 <0 50 2 1 6/9/2003 P 928 3780 002 — <50 <0 50 <0 50 <0 50 <0 50 <0 50 2 9 SMW-1 10!7/1994 50 24 1286 3738 2200 250 110 <05 360 -- 12/16l1994 1254 3770 0 32 — 5,200 740 210 330 600 2/2B/1995 1240 3784 014 8,300 1,000 330 450 790 4/25/1995 1271 3753 -031 5 100 470 110 270 480 7/27/1995 1300 3724 029 — 7,400 410 42 360 630 10/26/1995 (a) 13 03 -- — -- — 10/27/1995 — -- 7,600 640 33 440 410 2/12/1996 1200 — 3,800 390 <0 5 220 98 4/18/1996 1258 — 058 500 60 <05 20 7 4 -- 7/18/1996 12 B5 027 3,400 200 <5 0 130 56 60 11/15/1996 13 40 -055 2 500 180 <2 5 62 21 590 — 3/14/1997 NP 13 35 0 05 1,700 130 <0 5 <0 5 <0 5 230 013 6/4/1997 NP 12 73 — 0 62 520 36 31 1 4 1 5 47 005 K Mprwc W5 BP AAC01026B340uarterW 0178 0312093 OWMR 2003