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Table 1 , <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> 3425 Tracy Blvd, Tracy, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pglL) MIL) (pg/L) (pgll-) (pg/L) (pg/L) (pg/L) (mg/L) Comments <br /> ATR-2 12/24/2003 P 4922 1186 3736 <50 -- <0 50 <0 50 <0 50 <050 14* 2 3 <br /> 0311212004 P 21 03 1195 908 <50 -- <0 50 <0 50 <0 50 <0 50 0 60' 3 0 <br /> 06/01/2004 - 2103 1194 909 - - -- - -- - -- -- Not Sampled <br /> 09/20/200411 21 03 1212 891 INot Sampled <br /> 12/13/200411 2103 1207 896 INot Sampled <br /> ATR-3 4/23/1987 -- 4993 1179 3814 17 000 - 2,300 180 <5 0 2,300 - - <br /> 12/22/1987 - 4993 1193 3800 - - 5,000 50 530 250 - - <br /> 3/24/1988 - 4993 1258 3735 43,000 - 8,300 8 700 4 400 7 800 - - <br /> 6/23/1988 - 4993 11 17 3876 70,000 - 6,160 4,221 1,800 4,750 - - <br /> 9/29/1988 - 4993 1223 3770 57,400 -- 8,850 17 600 2 190 8 170 -- - <br /> 2/22/1989 4993 1182 3811 110 000 - 1,000 2,100 480 2,000 - - <br /> 6/29/1989 - 4993 -- - 4 500 - 890 520 250 1,100 -- - <br /> 9/1811989 - 4993 12 19r337 <br /> 7 74 7 400 -- 1,000 1,300 460 2,200 - - <br /> 12/28/1989 - 4993 12017 92 27 000 - 840 1,400 840 5,600 - -- <br /> 4/18/1990 - 4993 12157 78 4,800 - 1,000 490 340 1,500 -- - <br /> 10/16/1990 4993 1235 58 14,000 -- 1,900 1,300 780 4,600 -- -- <br /> 10/19/1990 -- 4993 1228 3765 - i - - -- -- - - _ <br /> 1/10/1991 - 4993 1201 3792 2,600 1 610 230 160 670 - -- <br /> 4/10/1991 - 4993 11 82 3811 3,000 -- 910 120 110 190 - - <br /> 711011991 - 4993 12 23 3770 19 000 - 420 300 340 760 - - <br /> 9/24/1991 -- 4993 1257 3736 2000 -- 280 81 69 130 - - <br /> 1/23/1992 - 4993 1212 3781 - - -- - -- - - - Sheen <br /> 412D11992 - <br /> 4993 1193 3800 - - -- - -- - - Sheen <br /> 7/8/1992 - 4993 1222 3771 - - - _ __ w - Sheen <br /> 10(7/1992 -- 4993 1238 3755 - - - -- _ - - -- Sheen <br /> 1/18/1993 - 4993 1122 3871 - - -- - - - -- - Sheen <br /> 4/14/1993 - 4993 1149 1 3844 - - - __ __ E14 <br /> - - Sheen <br /> 8/30/1993 - 4993 1243 3750 - - -- - - -- Sheen <br /> 10/27/1993 -- 4993 1239 3754 - - -- - _ Sheen <br /> 2/18/1994 - 4993 1200 3793 1,900 - 200 27 1205/20/1994 - 49 93 1207 3786 - - -- - -- - - Sheen <br /> 10/7/1994 - 4993 U 38 3755 ISheen <br /> 12/16/1994 - 4993 1203 3790 -- - - -- - - - - Sheen <br /> 1 <br /> Page 5 of 27 <br /> Report Date January 18,2005 <br />