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i <br /> 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 PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msi) (feet bgs) (feet msl) (pglL) (sig/!-) (ug1L) WWI-) (pglL) (Ng/L) WIL) (mg/L) Comments <br /> ATR-2 12/24/2003 P 4922 1186 3736 <50 - <0 50 <0 50 <0 50 <0 50 14* 23 <br /> 03/12/2004 P 2103 1195 908 <50 - <050 <0 50 <0 50 <0 50 0 60* 30 <br /> 06/01/2004 - 2103 1194 909 - -- - - - - -- Not Sampled <br /> 09120/2004 - 2103 1212 891 - - - - - - - Not Sampled <br /> 12/13/2004 - 2103 1207 896 -- - -- -- - -- - - Not Sampled <br /> ATR-3 4123/1987 -- 4993 1179 3814 17,000 -- 2,300 180 <50 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 /> 9/18/1989 -- 4993 1219 3774 7,400 - 1,000 1,300 460 2,200 - <br /> 12/28/1989 - 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 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 2,000 -- 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 - - - - - - - - ISheen <br /> 8/30/1993 - 1 4993 1243 1 3750 - - -- - - - - Sheen <br /> 10/27/1993 - 1 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 i 1203 3790 - - - - - - - -- Sheen <br /> Report bate February 22,2005 Page 5 of 27 <br />