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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 nisi) (feet bgs) (feet msl) (ug1L) (pg1L) (uglL) (Erg/L) WIL) W01L) MIL) (mg/L) Comments <br /> ATR-3 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 V 23 3770 57,400 - 8,850 17,600 2,190 8170 -- -- <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 /> 9/18/1989 -- 4993 1219 3774 7,400 - 1,000 1,300 460 2200 -12M/1989 - 4993 1201 3792 27,000 -- 840 1,400 840 5,600 - - <br /> 4/18/1990 - 4993 1215 3778 4,800 1,000 490 340 1,500 -- <br /> 10/16/1990 - 4993 1235 3758 14,000 -- 1,900 1 300 780 4,600 - - <br /> 10/19/1990 - 4993 1228 3765 -- -- -- - - - - - <br /> 1/10/1991 - 4993 1201 3792 2,600 -- 610 230 160 670 - - <br /> 4/10/1991 -- 4993 1182 3811 3 000 - 910 120 110 190 - -- <br /> 7/10/1991 - 4993 1223 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 /> 4/20/1992 -- 4993 1193 3800 -- - - - -- -- - - Sheen <br /> 7/8/1992 -- 4993 1222 3771 - - -- - -- - - -- Sheen <br /> 10/7/1992 - 4993 1238 3755 - - - -- - - - - Sheen <br /> 1/18/1993 - 4993 1122 3871 - -- -- - - - - -- Sheen <br /> 4/14/1993 - 4993 1149 3844 - -- _ __ _ - - 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 27 120 140 - - <br /> 5/20/1994 - 4993 1207 3786 - - - -- -- - - Sheen <br /> 10/7/1994 - 4993 1238 3755 -- -- - - -- _ __ Sheen <br /> 12/1611994 - 4993 1203 3790 - - _ _ _ _ - - Sheen <br /> 2/28/1995 -- 4993 1205 3790 - - -- - - -- - ",0 03 ft free product <br /> present <br /> 4/26/1995 -- 4993 1232 3761 - -- __ _ _ _ - -- Sheen <br /> 7/27/1995 - 4993 1251 3742 -- - - -- -- - -- <br /> 10/26/1995 - -- 1297 -- -- -- - - - -- - - (a) <br /> 2/12/1996 -- -- 1210 - 1,500 - 89 <0 5 43 150 - - <br /> Report Date May 6,2004 Page 5 of 25 <br />