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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) (pglL) (,uglL) (pg/L) (pg1L) (pg/L) (pg/L) (mg/L) Comments <br /> ATR-1 4/23/1987 — 5058 1249 3809 <100 - <0 5 <0 5 <0 5 23 -- <br /> 12/22/1987 — 5058 1263 3795 -- 59 <0 5 09 <0 5 — <br /> 3/24/1988 -- 5058 1254 3804 -- — <0 5 <0 5 <0 5 <0 5 - -- <br /> 6/23/1988 5058 1283 3775 - — <0 5 13 43 22 - -- <br /> 9/29/1988 -- 5058 1301 3757 -- -- <0 5 <0 5 <0 5 <0 5 -- -- <br /> 2/22/1989 5058 1246 3812 <100 — 14 <0 5 <0 5 1 8 — — <br /> 6/21/1989 — 5058 1237 3821 520 — 360 08 21 36 — -- <br /> 9118/1989 — 5058 1288 3770 27,000 — 250 1,200 570 7,100 — -- <br /> 12/27/1989 -- 5058 1268 3790 <50 34 <0 3 13 14 — — <br /> 4/18/1990 -- 5058 1284 3774 13 -- 21 15 16 16 - <br /> 10/16/1990 -- 5058 - - <50 -- 1 <0 5 2 2 -- <br /> 10/19/1990 -- 5058 1310 3748 - - - -- -- -- <br /> 1/10/1991 - 5058 1278 3780 <50 24 <0 5 57 23 -- -- <br /> 4/10/1991 — 5058 1252 3806 73 — 13 <0 5 48 <0 5 — <br /> 7/10/1991 -- 5058 1295 3763 90 -- 2 <0 5 47 17 -- - <br /> 9/24/1991 5058 1330 3728 <50 - <0 5 <0 5 <0 5 <0 5 -- <br /> 1/23/1992 — 5058 1277 3781 <50 — <0 5 <0 5 <0 5 <05 - - <br /> 4/2011992 5058 1258 3800 <50 - <0 5 <0 5 <G5 <0 5 -- -- <br /> 7/8/1992 - 5058 1290 3768 <50 — <0 5 <0 5 06 <0 5 - -- <br /> 10l7/1992 - 5058 1309 3749 1 <50 — <0 5 <0 5 <0 5 <0 5 -- - <br /> 1/18/1993 -- 5058 -- -- — - -- — -- -- - <br /> 4/14/1993 - 5058 1231 3827 <50 -- <0 5 <0 5 15 <0 5 <br /> 8/30/1993 -- 5058 1318 3740 <50 -- <0 5 <0 5 <0 5 <0 5 — — <br /> I <br /> 10/27/1993 5058 1313 3745 <50 — <0 5 <0 5 <05 <0 5 — -- <br /> 2/1811994 5058 1265 3793 17 06 1 1 08 -- -- <br /> 5/20/1994 -- 5058 1271 3787 27 - 06 03 14 <0 5 — - <br /> 10l7/1994 5058 1314 3744 <50 — <0 5 <0 5 <0 5 <0 5 -- <br /> 12/16/1994 -- 5058 1274 3784 <50 - <0 5 <0 5 <0 5 <0 5 — - <br /> 2/28/1995 -- 5058 12 65 3793 <50 -- <0 5 <0 5 1 <0 5 - — <br /> 4/26/1995 -- 5058 1290 3768 <50 — <0 5 <0 5 <0 5 <0 5 -- <br /> 7/27/1995 5058 1322 3736 -- - — -- -- -- -- -- <br /> 10/26/1995 - 5058 1340 3718 -- -- -- -- -- -- <br /> 10127/19951 - 5058 1 — — <50 <0 5 <0 5 <05 1 <0 5 — — <br /> Report Date May 6,2004 Page 1 of 25 <br />