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Page 5 of 20 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Blvd,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 DO <br /> Number Sampled (ft,MSL) (ft TOC) (ft,MSL) Change(ft) (ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg1L) <br /> ATR 3 10/26/1995 (a) 1297 -- <br /> (cant) 2/12/1996 1210 - 087 1 500 89 <0 5 43 150 - <br /> 4/18/1996 1260 0 50 - -- -- -. -- .. _ _ <br /> 7/18/1996 1260 000 1,600 26 5 2 70 51 1,800 - <br /> 11/15/1996 1340 - -080 -- - -- -- <br /> 3/14/1997 NP 13 34 -- 006 1,200 10 <0 5 43 19 620 005 <br /> 6/4/1997 1270 064 - - -- - -- 0 15 <br /> 8/11/1997 NP 1272 - -002 3,400 20 <10 160 110 <50 - <br /> 11/17/1997 1293 -0 21 -- -- __ __ -- _ -- <br /> 3/30/1998 NP 12 18 075 8400 <2 5 <2 5 100 52 120 0 8 <br /> 6/25/1998 1241 -023 - -- <br /> 9/11/1998 NP 1284 043 1,100 6 1 <0 5 25 22 41 123 <br /> 12/15/1998 1160 124 -- -- -- -- 21 <br /> 3117/1999 NP 1241 - -0 81 652 1 41 <0 5 117 729 16 4 7 8 <br /> 5/14/1999 1270 - .029 -- -- -- -- -- -- 120 <br /> 9/16/1999 NP 1279 -- -009 - 2,800 175 <5 0 499 151 523 1 9 <br /> 12/22J1999 1276 -- 003 -- -- -- -- -- -- 0 37 <br /> 2/29/2000 NP 1210 - 0 66 405 235 <1 00 5115 1 18 2,160 3 6 <br /> 6/7/2000 NP 1281 - 0 71 -- -- -- -- __ __ _. <br /> 9/25/2000 NP 1301 -- -020 -- 2,350 <2 50 5 65 26 9 840 464 0 60 <br /> 12/29/2000 1147 - 1 54 -- -- -- -- -- _ 4 2 <br /> 3/27/2001 P 1249 -- -102 -- <60 0 <0 500 <0 500 <0 500 <0 500 526' 3 2 <br /> 6/20/2001 12 65 -- -016 <br /> 9/1212001 P 1271 -006 54 053 10 0 56 2 5 8 3 2 5 <br /> 12!19/2001 1256 -- 015 - - .- -- __ .. <br /> 3/14/2002 P 1257 - -001 -- 2300 <10 10 <10 <10 <5 0' 1 28 <br /> 6/28/2002 -- .- .. _ .. .. _ .. ,. .. <br /> ATR 4 4/23/1987 49 03 1085 3818 - 21,000 3,000 200 <10 950 <br /> 12/22/1987 1100 3803 -0 15 -- - 5,300 310 430 270 - <br /> 3/24/1988 1098 3806 002 -- 6,000 5,800 320 930 740 - -- <br /> 6/23/1988 1211 3692 -1 13 - 5,200 237 88 2 10 - <br /> 9/29/1988 1072 38 31 139 -- 1,400 1,430 115 350 130 - <br /> 2/22/1989 1091 3812 019 22,000 1,300 82 54 170 - - <br /> 6/29/1989 1100 3803 -009 -- 1 300 590 38 97 220 -- <br /> 9/18/1989 11 19 3784 -019 -- 630 280 13 49 100 -- <br /> 12/28/1989 1108 3795 Oil -- 1,300 500 25 56 160 -- <br /> 4/18/1990 1125 37 78 -017 440 150 5 1 35 63 <br /> 10/16/1990 1138 3765 -013 - 380 26 41 4 8 038 - -- <br /> 111011991 11 16 3787 022 330 150 31 30 35 -- <br /> K V5 8P ARCM209310u4rterly\2 OTR 021TWe 1_2_3 As <br />