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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 msl) (feet bgs) (feet mst) (pg/L) (pgIL) (pglL) (pglL) (pg/L) (pg/L) (vg/L) (mg/L) Comments <br /> ATR-7 12/22/1999 NP 4965 1252 37 13 <50 — <05 <05 <0 5 <05 <2 50 42 <br /> 2/29/2000 NP 4965 1206 3759 <50 — <0 5 <0 5 <0 5 <0 5 <2 50 47 <br /> 6/7/2000 NP 4965 1255 3710 <50 -- <0 5 <0 5 <05 <0 5 572 -- <br /> 9/25/2000 NP 49 65 1271 3694 <50 -- <05 <0 5 <0 5 <05 <250 05 <br /> 12/29/2000 P 4965 1243 3722 <50 0 -- <0 500 <0 500 <0 500 0 656 17 5* 67 <br /> 3/27/2001 P 4965 1233 3732 <50 0 — <0 500 <0 500 <0 500 <0 500 305* 38 <br /> 6/20/2001 P 4965 1247 3718 <50 — <0 50 <0 50 <0 50 <050 580* -- <br /> 9/12/2001 P 4965 1250 3715 <50 -- <0 50 <0 50 <0 50 <0 50 140 12 <br /> 12119/2001 P 4965 1235 3730 <50 — <0 50 -1050 <0 50 <0 50 7 2* 101 <br /> 3/14/2002 P 4965 1242 3723 <50 -- <050 <0 50 <0 50 <0 50 14* 066 <br /> 6/28/2002 P 4965 1248 3717 <50 -- <05 <05 <05 <0 5 0 97* 36 <br /> 9111/2002 P 4965 1244 3721 <50 -- <05 <0 5 <0 5 <0 5 1 1* 29 <br /> 12/17/2002 P 4965 11 96 3769 <50 — <05 <0 5 <0 5 <0 5 <0 5* 39 <br /> 03/31/2003 P 4965 1237 3728 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 28 <br /> 06/09/2003 P 4965 1234 3731 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 30 <br /> 09/18/2003 P 4965 1252 3713 1 <50 — <0 50 <0 50 <0 50 <0 50 <0 50` 38 <br /> 12/24/2003 P 4965 1240 3725 <50 -- <0 50 <050 <050 <0 50 <0 50* 34 <br /> 03112/2004 P 2144 1253 891 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 20 <br /> 06/01/2004 -- 2144 1248 896 — - — — -- — — — Not Sampled <br /> 09/20/2004 -- 2144 1258 886 — — -- — — -- -- Not Sampled <br /> 12/13/2004 — 2144 1251 893 -- -- -- — -- -- — — Not Sampled <br /> 03102/2005 P 214-4 1230 914 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50* 30 <br /> ATR-8 8/25/1991 -- 45 98 — — 2,700 — 110 <0 5 130 98 — -- <br /> 9/25/1991 — 4598 885 3713 1 400 -- 95 <0 5 51 97 — <br /> 1/23/1992 — 4598 829 3769 <50 - 25 <05 <0 5 <0 5 — — <br /> 4/20/1992 -- 4598 811 3787 — — -- -- -- — - — <br /> 4/21/1992 — 4598 -- -- 140 -- 14 09 14 93 -- -- <br /> 7/8/1992 4598 848 3750 87 -- 4 <0 5 92 08 -- - <br /> 10/7/1992 — 4598 869 3729 — — — -- — -- — <br /> 10/8/1992 -- 4598 -- -- 140 -- 78 32 11 88 — -- <br /> 1/18/1993 -- 4598 709 3889 — — — — — -- — <br /> 1/19/1993 — 4598 -- — 980 - 14 17 11 34 — -- <br /> 4/1411993 — 4598 780 3818 -- — — -- -- — -- <br /> Report Date March 21,2005 Page 15 of 27 ' <br />