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i q'9e2ol16 Table 1 Groundwater Elevation and Analytical Data ARCO Service Slation#2093 3425 Tracy Blvd.,Tracy,CA Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPH9 Benzene Toluene benzene (total) MTBE DO Number Sampled (ft,MSL ft,TOC (fl,MKI Change(fttt (Ug/L (ug/L (ug/L (ug/L (Ug/L u m /L ATA-1 12/22/1999 13.19 37.39 0,17 - - -- - - -. 177 (card,) 2/29/2000 NP 12.45 38.13 0.74 - <50 <0.5 <0.5 <0.5 <0.5 <2.5 4.90 6/7/2000 NP 13.16 37,40 -0.73 -- - __ - _ 9/25/2000 NP 13.39 37.19 -0.21 -- <50 <0.5 <0.5 <0.5 2.55 <2.5 0.30 12/29/2D00 12.99 37.59 0.40 - -- -- -- 5.3 3!27/2001 Well inaccessible 6/20/2001 13.01 37.57 -0.02 - 9/12/2001 Well inaccessible 12/19/2001 Well inaccessible 3/14/2002 Well inaccessible 6/28/2002 Well inaccessible 9/11/2002 Well inaccessible 12M712002 -- - _ _ _ ATR-2 4/23/1987 49.22 11.28 37.94 -- - <100 <0.5 0.6 <0.5 <0.5 - 12/22/1967 11.40 37.82 -0.12 - - <0.5 <0.5 <0.5 <0,5 - - 3/24/1988 11.35 37,87 0.05 <0.5 <0,5 <0.5 <0.5 6/23/1988 11.55 37.67 -0.20 <0.5 <0.5 <0.5 <0.5 9/29/1988 11.71 37.51 -0.16 - <0.5 <0,5 <0.5 <0.5 - 2/22/1989 11.35 37.87 0.36 - 370 1.8 0.7 0.6 3.4 6/21/1989 11.45 37.77 -0.10 <50 1.9 <0.3 0.4 <0.3 - -- 9/18/1989 11.65 37.57 -0.20 9 1.9 0.9 1.1 8.2 -- -- 12/27/1989 11.50 37.72 0.15 <50 3.5 <0.3 1.1 0.3 - -- 4/18/1990 11.64 37.58 -0.14 50 2.9 <0.3 <0,3 <0.3 - -- 10/16/1990 11.81 37.41 -0.17 - <50 <0.5 <0.5 <0.5 <0.5 - 10/19/1990 11.81 37.41 0,00 -- -. - - 1/10/1991 11.58 37,64 0,23 <50 0.8 <0,5 <0.5 <0.5 - 4/10/1991 11.35 37.87 0.23 <50 <0.5 <0.5 <0.5 <0.5 - - 7/10/1991 11.74 37.48 -0,39 - <50 <0.5 <0.5 <0.5 <0.5 - 9/24/1991 12.02 37.20 -0.28 <50 <0.5 <0.5 <0.5 <0.5 1/23/1992 11,60 37.52 0.42 <50 <0.5 <0.5 <0.5 <0.5 4/20/1992 11.53 37.69 0.07 <50 <0.5 <0.5 <0.5 <0.5 - 7/8/1992 11,75 37.47 -0.22 - <50 2.8 <0.5 <0.5 <0,5 - 10/7/1992 11.83 37.39 -0.08 59 5.7 <0.5 <0.5 <0.5 - 1/18/93 4!14/1993 11.29 37.93 - 55 3.8 0.7 0.8 1.9 8/30/1993 11.96 37.26 -0.67 <50 <0.5 <0,5 <0.5 <0.5 - 10/27/1993 11.95 37.27 0.01 - <50 <0.5 4.5 <0.5 <0.5 - 2l18/1994 11.54 37.68 0.41 <10 0.7 0.9 <03 0.7 - 5/20/1994 11.61 37.61 -0.07 - <to 0.9 <0.3 <0.3 <0.5 - - 10/7/1994 11.93 37.29 -0.32 <50 <0.5 <0.5 <0.5 <0,5 - 12/16/1994 11.56 37.66 0,37 <50 <0.5 <0.5 <0.5 <0.5 •- 2/28/1995 11,60 37.62 -0.04 <50 <0,5 <0.5 <0.5 <0.5 - 4/25/1995 11.95 37.27 -0.35 <50 <0.5 <0.5 <0.5 <0.5 - 7/27/1995 12.91 $6.31 -0.96 - <50 <0.5 <0,5 <0.5 <0.5 - - 10/26/1995 12.26 36.96 0.65 <50 <0.5 <0.5 <0.5 <0.5 - 2/12/1996 11.40 37.82 0.86 - <50 <0.5 <0.5 <0.5 <0.5 - - 4/1611996 11.90 37.32 -0,50 - <250 <2.5 <2.5 <2.5 <2.5 -- - K,,W BP AACOMODMQuwtw,AI QTR 0ZT4bIe 1A�