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i �13 of 16 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#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 (fl,MSL} (fl,TOC) (ft,MSL) Change(ft) (fl)- (ug/L) (ug/L) - OWL) (ug/L) (ug/L) (uq/L) (mg/L) ATR-10 3/14/2002 Well inaccessible (cont.) 6/28/2002 9/11/2002 Well inaccessible 12/17/2002 - - - _ _ ATR-1 t 8125/1991 46.84 - - - <50 <0.5 <0,5 <0.5 <0.5 - - 9/24/1991 9.50 37.34 - .. 9/25/1991 - - <50 <0.5 <0.5 <0.5 <0.5 - 1/23/1992 8.95 37.89 <50 <0.5 <0.5 <0.5 <0,5 - - 4/20/1992 8.78 38.06 0.17 _ _ 4/21/1992 - <50 <0.5 <0.5 <05 <0.5 » 7/8/1992 9.12 37.72 - <50 <0.5 <0.5 <0.5 <0,5 10/7/1992 9.30 37.54 -0.18 <50 <0,5 <0.5 <0.5 <0.5 1/18/1993 7.80 39.04 1.50 <50 <0.5 <0.5 <0.5 <0.5 4/14/1993 8.47 38.37 -0.67 <50 <0.5 <0.5 <0.5 <0.5 - 8131/1993 9.38 37.46 491 <50 <0.5 <0.5 <0.5 <0.5 » 10/27/1993 9.31 37.53 0.07 <50 <0.5 <0.5 <0.5 <0.5 - - 2/18/1994 8.63 38,01 0.48 <10 0.8 1 <0.3 0.6 5/20/1994 8.93 37,91 -0.10 <10 <0.3 <0.3 <0,3 <0.5 » - 10/1/1994 9.34 37.50 -0.41 <50 <0.5 <0.5 <0.5 <0.5 - 12/16/1994 8.91 37.93 0.43 <50 <0.5 <0.5 <0.5 <0.5 - 2/28/1995 8.85 37.99 0.06 - <50 <0.5 <0.5 <0.5 <0,5 4/25/1995 9.11 37.73 -0.26 - <50 <0.5 <0.5 <0.5 <0.5 7/27/1995 9.43 37.41 -0.32 _ 10/26/1995 9.59 37.25 -0.16 - _ 2/12/1996 8.42 38.42 1.17 - <50 <0,5 <0.5 <0.5 <0.5 - 4/18/1996 9,019 37.81 -0.61 7/18/1996 9.45 37.39 -0.42 <50 <0.5 <0.5 <0.5 <0.5 <5 11/15/t996 9.95 36.89 -0.50 3/14/1997 NP 9.86 36,98 0.09 <50 <0.5 <0.5 <0.5 <0.5 - 0.15 6/411997 9.24 3760 0.62 - » _ _ 0.08 8/11/1997 NP 9.63 37.21 -0.39 <50 <0.5 <0.5 <0,5 <0,5 <2.5 11/17/1997 9.47 37.37 0.16 _ _ ,9/30/1998 NP 8.66 38.18 0.61 <50 <0.5 <0.5 <0.5 <0.5 <5.0 1.5 6/25/1998 9,92 36.92 -1.26 » - - _ 9/11/1998 P 9.40 37,44 0.52 <50 <0.5 <0,5 <0.5 <0.5 <25 1.61 12/15/1998 9.19 37.65 0.21 - - 1.1 3/17/1999 P 8.96 37.88 0.23 - <50 <0.5 0.821 <0.5 <0,5 <5.0 3.7 5/14/1999 9.20 38,87 0.99 - - 2.80 9/16/1999 P 9.52 38,55 -0.32 - <50 <0.5 <0.5 <0.5 <0.5 <5.0 3.4 12/22/1999 9.32 37.52 -1.03 -- - 0.44 2/29/2000 P 8.60 38.24 0.72 114 <0,5 0.678 <0.5 1.63 <2.5 3.2 6/7/2000 NP 9.35 37,49 -0.75 - - - _ 9/25/2000 NP 10.21 36.63 -0.86 - <50 <0.5 <0.5 <0.5 <0.5 8.93 0.5 12/21/2000 9.15 37.69 1.06 - - - - - 4.5 3/27/2001 P 9.06 37,78 0.09 - <50,0 <0.500 <0.500 <0.500 <0.500 <2.00' 3.7 6/20/2001 9.25 37.59 -0.19 - - -- _ _ _ 9112/2001 P 10.31 36.53 -1,06 -- <50 <0.50 <0.50 <0.50 <0.50 <2.5 1.6 Kava SP ARCGI600@ IQu4kvV4 OTR=Tabb tZB&