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Page 7 of 16 Table 1 Groundwater Elevation and Analytical data ARCO Service Station 112093 3425 Tracy Blvd.,Tracy,CA Well Depth Groundwater Groundwater Product Ethyf- Xyfenes Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled ft.MSL ft,TOC ft,MSL Change(fttt (Ug/L (ug/L (ug/L (U21L) (ug/L (ug/L m /L ATR-5 12/15/1998 NP 10.20 - 134 <0.5 <0.5 <0.5 <0.5 8.98 1.7 (cont.) 3/17/1999 NP 9.81 0.39 - 75.6 0.586 <0.5 0.876 1.02 <5.0 74 5/14/1999 NP 10.34 -0.53 - <50 <0.5 <0.5 <0.5 <0.5 <5 6.5 9/16/1999 NP 10.40 - -0.06 <50 <0.5 <0.5 <0.5 <0.5 5.12 2.2 12/22/1999 NP 10.30 0.10 -- <50 <0.5 <0.5 <0.5 <0.5 <2.50 6.35 2/29/2000 NP 9.70 0.60 - <50 <0.5 <0.5 <0.5 <0.5 3.06 2.9 68/2000 Well inaccessible 9/25/2000 NP 10.57 - - <50 <0.5 <0.5 <0,5 <0.5 <2.50 0.40 12/29/2000 P 10.19 - 0.38 136 1.28 <0.500 <0.500 0.656 <2,00' 5,1 3/27/2001 P 10.04 - 0.15 - 80.8 <0.500 <0,500 <0.500 0.537 18,0' 3.5 6/20/2001 P 16.23 - -0.19 - 150 1.7 <0.50 <0.50 0.67 220' 9/12/2001 P 10.35 -0.12 150 <0.50 <0.50 <0.50 <0.50 92 1.6 12/19/2001 Well inaccessible 3/14/2002 Well inaccessible 6/28/2002 P 10.38 -- 67 <0,5 <0.5 <0.5 <Q.5 83' 4.7 911112002 P 48.73 10,24 38.49 0.14 - <50 <0.5 <0.5 <0.5 0.76 19' 3.7 12/17/2002 Well inaccessible ATR-6 3/10/1989 49.35 - - <200 <0.5 <0.5 <0.5 <0.5 6/21/1989 11.54 37.81 - <50 <0.3 <0.3 <0.3 0.3 - 9/18/1989 11.60 37.75 -0.06 <50 0.5 1,3 0.3 3.8 12/27/1989 11.57 37.78 0.03 - <50 <0.3 <0.3 <0.3 0.4 4/18/1990 11.68 37.67 -0.11 <50 19 2.4 0.6 5 _ 10/16/1990 - - <50 <0.5 <0.5 <0.5 <0.5 - 10/19/1990 11.80 37.55 - _ 1/10/1991 11.64 37.71 0,16 - <50 <0.5 <0.5 <0.5 <0.5 4/10/1991 11.52 37.83 0,12 - <50 <0.5 <0.5 <0.5 <0.5 _ 7/10/1991 11.76 37.59 -0.24 - <50 <0.5 <0.5 <0,5 <0.5 9/24/1991 11.95 37,40 -0.19 <50 0,5 <0.5 <0.5 <0.5 _1/2311992 11.66 37.69 0.29 <50 <0.5 <0.5 <0.5 <0.5 - 4/20/1992 11.56 37.79 0.10 - _ 4/21/1992 - - - <50 <0.5 <0.5 <0.5 <0.5 -- - 7/8/1992 11.72 37.63 - <50 <0.5 <0.5 <0.5 <0.5 -- 10/7/1992 11.82 37,53 -0.10 - <50 <0,5 <0.5 <0.5 <0.5 1/16/1993 11.04 38.31 0.78 <50 <0.5 <0.5 <0.5 <0.5 -- 4/14/1993 11.42 37.93 -0.38 - 310 75 <0.5 <0.5 <0,5 - 8/31/1993 -- _ 10/27/1993 11.84 37.51 - <50 <0.5 <0.5 <0.5 - 2/17/1994 _ - 5/20/1994 _ 10/7/1994 11.85 37.50 - <50 <0.5 <0.5 <0 5 <0.5 12/16/1994 11.54 37.81 0.31 - <50 <0.5 <0.5 <0.5 <0.5 2/28/1995 11.65 37.70 -0.11 - <50 <0.5 <0.5 <0.5 <0.5 4/26/1995 - -- 7/27/1995 - _ 10/26/1995 1218 37.17 -- - <50 <0.5 <0,5 <0.5 <0.5 2/12/1996 11.57 37.78 0,61 - <50 <0,5 <0.5 <0.5 <0.5 ` 4/18/1996 11.91 37,44 -0.34 - - K:us era nFICCAM raS%Q, vwhAt orn oaraas 1_7a.,d.