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} <br /> i <br /> Page 6 of 17 <br /> Table 1 <br /> Groundwater Elevation and Analytical data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Boulevard,Tracy,CA <br /> Well Depth Groundwater Groundwater Product Ethyl Xylenes <br /> Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MTBE 00 <br /> Number Sampled (ft MSL) (ft,TOC) (ft MSL) Change(ft) (ft) (ug/L) (ug/L) (u /L) ug/L) (ug/L) (ug1L) (mg/L) <br /> ATR 4 12/29/2000 P 10 81 043 — <50 0 <0 500 <0 500 <0 509 <0 500 636 4 5 <br /> (cont) 3/27/2001 P 10 64 0 17 -- <50 0 <0 500 <0 500 <0 500 <0 500 <2 00 3 1 <br /> 6/20/2001 P 1084 -0 20 — <50 <0 50 <0 50 <0 50 <0 50 <2 0' <br /> 9/1212001 P 10 94 010 -- <50 <0 50 <0 50 <0 50 <0 50 <2 5 2 4 <br /> 12/19/2001 P 10 78 016 -- <50 c0 50 <0 50 <0 50 <0 50 <2 0 1 59 <br /> 3/14/2002 P 10 78 000 <50 <0 50 <0 50 <0 5o <0 50 710 129 <br /> 6/28/2002 P 1076 -- 000 <50 <0 5 <0 5 <05 <0 5 <05 3 5 <br /> 9/11/2002 P 1092 3811 0 14 <50 <0 5 <0 5 <05 <05 <05 3 3 <br /> 12/17/2002 Well inaccessible <br /> 3/31/2003 P 1072 3831 <50 <0 50 <0 50 <0 50 <0 50 <0 50 3 9 <br /> 6/9/2003 P 10 T7 38 26 -005 — <50 <0 50 <0 50 <0 50 066 <0 50 5 2 <br /> ATR 5 3/10/1969 48 73 6 600 693 <5 0 327 7 0 - <br /> 6/29/1989 1052 38 21 -- 2200 490 2 4 280 1 3 <br /> 9/18/1989 1098 3775 046 1 000 68 1 1 63 5 a — <br /> 12/27/1989 1076 37 97 022 2200 94 2 0 150 <1 0 — <br /> 4/18/1990 1090 3783 -014 — 1 900 120 2 6 8 140 — <br /> 10/16/1990 — 1 000 18 4 7 79 16 — <br /> 10/19/1990 11 19 37 63 -- -- -- — <br /> 1/10/1991 10 84 3789 026 350 7 1 12 16 2 6 — <br /> 0 0/1991 10 67 38 06 017 370 4 6 <0 5 7 0 <0 5 <br /> 7/10/1991 1102 37 71 -0 35 1200 9 5 <0 5 18 1 5 — <br /> 9/24/1991 1129 3744 0 27 <50 <05 <0 5 <0 5 <0 5 <br /> 1123/1992 1078 3795 0 51 180 1 4 1 5 1 5 <05 — <br /> 4/20/1992 10 70 3803 008 — — <br /> 4/21/1992 - 290 1 6 <0 5 2 0 <0 5 — <br /> 7/8/1992 1097 37 76 - 240 <05 <0 5 0 6 <05 <br /> 10/7/1992 11 11 37 62 014 — — — <br /> 10/8/1992 160 <05 <0 5 <0 5 <0 5 <br /> 1/16/1993 994 3879 — -- <br /> 1/19/1993 -- 1 000 25 <0 5 7 9 1 3 — <br /> 4/14/1993 1047 .3826 — -- <br /> 4/15/1993 - — 810 1 5 <0 5 8 3 0 9 <br /> 6/31/1993 11 16 37 57 80 <0 5 <0 5 <0 5 <05 — <br /> 10/27/1993 11 11 3762 005 63 <0 5 <0 5 <0 5 <05 — <br /> 2118/1994 1073 3800 0 36 — 160 3 0 5 0 10 4 0 <br /> 5/20/1994 1082 3791 -009 — 600 <0 3 2 0 1 2 1 7 <br /> 10/7/1994 11 14 3759 032 — 660 <05 <05 <0 5 <0 5 <br /> 12/16/1994 1077 3796 037 — 410 6 5 <0 5 <0 5 <05 <br /> 2128/1995 10 80 3793 -0 03 60 <0 5 0 6 <0 5 <05 — — <br /> 4/26/1995 It 04 37 69 -024 — 83 <0 5 <05 <05 <0 5 <br /> 7/27/1995 11 27 3746 -0 23 58 <0 5 <0 5 <0 5 1 2 — <br /> 10/26/1995 (a) 1051 — — — -- — <br /> 10/27/1995 -- — — — <520 <5 0 <0 5 <05 <05 — <br /> 2/12/1996 960 — 92 1 0 <05 <05 <0 S -- <br /> 4/18/1996 806 1 54 60 <0 5 <0 5 <0 5 <0 5 -- <br /> 7/18/1996 1011 205 280 4 8 <0 5 <0 5 <05 14 <br /> 1111511996 — — — <br /> X IWp-V5 eP ARaotamoQwwWyy 2 O'M 03%2083 OWMR 2Q03 <br />