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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) Lug/L) (pg/L) (ugIL) (pg/L) Lug/L) (pg/L) (pglL) (mg1L) Comments <br /> ATR-4 03/31/2003 P - 1072 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 39 <br /> 06/09/2003 P -- 1077 — <50 -- <0 50 <0 50 <0 50 066 <0 50* 52 <br /> 09/18/2003 P 1097 -- <50 -- <050 <0 50 <0 50 <0 50 <0 50* 38 <br /> 12/24/2003 P -- 1074 -- <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 25 <br /> 03/1212004 P 2041 1068 973 <50 -- 14 <0 50 <0 50 35 <0 50* 36 <br /> 0610112004 — 2041 1087 954 -- — — — — — — -- Not Sampled <br /> ATR-5 3/10/1989 — 4873 -- — 6,600 — 693 <50 327 7 -- <br /> 6/29/1989 — 4873 1052 3821 2,200 -- 490 24 280 13 -- — <br /> 9/18/1989 -- 4873 1098 3775 1,000 68 1 1 63 5 8 — <br /> 12/27/1989 -- 4873 1076 3797 2,200 — 94 2 150 <1 — -- <br /> 4/18/1990 -- 4873 1090 3783 1,900 -- 120 26 68 140 -- — <br /> 10/16/1990 — 4873 -- -- 1 000 — 18 4 7 79 16 — — <br /> 10/1911990 -- 4873 1110 3763 — - — -- — — <br /> 1/10/1991 — 4873 1084 3789 350 -- 71 12 1 16 26 — <br /> 4/10/1991 — 4873 1067 3806 370 — 46 <0 5 7 <05 — <br /> 7/10/1991 - 4873 1102 3771 1,200 - 95 <0 5 18 1 5 -- <br /> 9/24/1991 4873 1129 3744 <50 -- <05 <0 5 <0 5 <0 5 -- -- <br /> 1/23/1992 4873 1078 3795 180 — 14 1 5 15 <0 5 — -- <br /> 4/20/1992 4873 1070 3803 -- -- -- — — — <br /> 4/21/1992 - 4873 -- -- 290 16 <05 2 <05 -- <br /> 7/8/1992 4873 1097 3776 240 - <05 <0 5 06 <0 5 -- — <br /> 10f7/1992 - 4873 11 11 3762 -- — -- -- -- — <br /> 10/8/1992 - 4873 -- -- 160 - <0 5 <0 5 <0 5 <0 5 — — <br /> 1/18/1993 4873 994 3879 -- — — -- -- -- — <br /> 1/19/1993 -- 4873 -- -- 1,000 -- 25 <0 5 79 13 - -- <br /> 4/14/1993 4873 1047 3826 -- -- - -- -- <br /> 4/15/1993 -- 4873 -- — 810 -- 1 5 <0 5 83 09 - <br /> 8/31/1993 4873 11 16 3757 80 — <05 <0 5 <0 5 <0 5 - — <br /> 10/27/1993 - 4873 11 11 3762 63 <05 <0 5 <0 5 <0 5 -- - <br /> 2/18/1994 4873 1073 3800 160 3 5 1 4 - <br /> 5/20/1994 4873 1082 3791 600 - <03 2 1 2 17 -- - <br /> 10/7/1994 - 4873 11 14 37 59 660 <05 <0 5 <0 5 <0 5 - -- <br /> 12/16/1994 -- 4873 1077 3796 410 - 65 <0 5 <0 5 <0 5 -- — <br /> Report Date July 15,2004 Page 9 of 26 <br /> i <br />