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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) (pg1L) (pg/L) (pg1L) (pg/L) (pg/L) (pg/L) (pg/L) (mg/L) Comments <br /> ATR-4 12/29/2000 P — 1081 — <50 0 <0 500 <0 500 <0 500 <0 500 636* 45 <br /> 3/27/2001 P — 1064 <50 0 -- <0 500 <0 500 <0 500 <0 500 <2 00* 31 <br /> 6/20/2001 P -- 1084 — <50 — <0 50 <0 50 <0 50 <0 50 <2 0* — <br /> 9112l2001 P - 1094 -- <50 - <0 50 <0 50 <0 50 <0 50 <2 5 24 <br /> 12/19/2001 P — 1078 — <50 <0 50 1 <0 50 <0 50 <0 50 <2 0* 159 <br /> 3/14/2002 P .1078 — <50 -- <0 50 <0 50 <0 50 <0 50 710* 129 <br /> 6/28/2002 P - 1078 — <50 - <05 <0 5 <0 5 <0 5 <0 5* 35 <br /> 9/11/2002 P — 1092 — <50 -- <05 <0 5 <0 5 <05 <0 5* 3 3 <br /> 12/17/2002 — — - -- -- — — — -- -- — Well inaccessible <br /> 03/31/2003 P — 1072 -- <50 — <0 50 <050 <0 50 <0 50 <0 50* 39 <br /> 06/09/2003 P — 1077 -- <50 — <0 50 <050 <0 50 066 <0 50* 52 <br /> 09/18/2003 P — 1097 -- <50 -- <0 50 <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 /> 03/12/2004 P 2041 1068 973 <50 -- 14 <0 50 <0 50 3 5 <0 50* 36 <br /> 06/01/2004 — 2041 1087 954 — — — — -- -- -- — Not Sampled <br /> 09/20/2004 — 2041 1099 942 - — -- -- — — -- -- Not Sampled <br /> 12/13/2004 -- 20 41 1091 9 50 - -- — -- — — -- — Not Sampled <br /> 03/02/2005 P 2041 1054 987 <50 -- <0 50 <0 50 <0 50 1 <0 50 <0 50* 52 <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 1 3 -- — <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 2 6 68 140 -- — <br /> 10/16/1990 — 4873 -- — 1,000 — 18 47 79 16 -- — <br /> 10/19/1990 -- 4873 11 10 3763 -- -- -- -- _ _ — <br /> 1/10/1991 -- 4873 1084 3789 350 — 71 12 16 26 -- — <br /> 4/10/1991 -- 4873 1067 3806 370 -- 46 <0 5 7 <0 5 — — <br /> 7/10/1991 4873 1102 3771 1,200 — 95 <05 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 - 1 6 <0 5 2 <0 5 — <br /> 7/8/1992 -- 4873 1097 37 76 240 - 105 <0 5 06 1 <0 5 — — <br /> Report Date March 21,2005 Page 9 of 27 <br />