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i 11 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 TPHg Benzene Toluene benzene (total) MTBE DO Number Sam led H,MSL tt,TOC 11,MSL Change(ftft u IL (u2/L) (ug/L u (Ug/L (ug/L m /L ATR-9 9/25/1991 - -- - -- <50 <0.5 <0.5 <0,5 <0.5 (cord.) 1/23/1992 10.96 37,72 - -- <50 <0,5 <0.5 <0.5 <0.5 - 4/20/1992 10.88 37.80 0.08 - -- - - 4/21/1992 - -- <50 <0.5 <0,5 <0.5 <0.5 - 7/8/1992 11.06 37.62 - - <50 <0.5 <0.5 <0.5 <0.5 - 10/7/1992 11,16 37.52 -0.10 <50 <0.5 <0.5 <0.5 <0.5 - 1/18/1993 10.34 38.34 0.82 <50 <0.5 <0.5 <0.5 <0.5 - 4/14/1993 10,70 37.98 -0.36 <50 <0.5 <0.5 <0.5 <0.5 - 8/30/1993 11.17 37.51 -0.47 -- <50 <0.5 <0.5 <0.5 <0.5 - 10/27/199311.23 37.45 -0.06 -- <50 <0.5 <0.5 <0,5 0.7 = 2/17/1994 10.89 37.79 0.34 2/16/1994 -- - -- <10 <0.3 0.4 <0.3 <0.5 5/20/1994 10.97 37.71 -- - <10 <0.3 <0,3 <0.3 <0.5 10/7/1994 11.19 37,49 -0.22 -- <50 <0.5 <0.5 <0.5 <0.5 - 1216/1994 10,91 37.77 0.28 <50 <0.5 <0.5 <0.5 <0,5 2/28/1995 10.93 37.75 -0.02 <50 <0.5 <0.5 <0.5 <0.5 - 4/25/1995 11.46 37.22 -0.53 <50 <0.5 <0,5 <0.5 <0.5 - 7/27/1995 11.73 36.95 -0.27 -- -- 1 O/25/1995 _10/25/1995 11.80 36.88 -0.07 <50 <0.5 <0.5 <0.5 <0.5 - 2/12/1996 10.90 37.78 0.90 <50 <0.5 <0.5 <0.5 <0.5 4/18/1996 11.30 37.38 -0.40 - -- __ - 7/18/1996 11.68 37.00 -0.38 <50 <0.5 <0.5 <0.5 <0,5 <5 11/15/1996 12.23 36.45 -0.55 -- -_ - 3/14/1997 NP 12.23 36.45 0.00 - <50 <0.5 <0,5 <0.5 <0.5 - 0.20 6/4/1997 11.52 37.16 0,71 - -- 0,46 8/11/1997 NP 11,86 36.82 -0.34 <50 <0.5 <0.5 <0.5 <0.5 <2.5 IIM7/1997 11.72 36.96 0.14 - - -- - _ 3/30/1998 NP 11.10 37.58 0.62 <50 <0.5 <0.5 <0,5 <0.5 <5.0/<2.0' 2.40 6/25/1998 11.51 37.17 -0.41 -- __ -- 9111/1998 NP 11.65 37.03 -0.14 - <50 <0.5 <0.5 <0.5 <0.5 <25 1.81 12/15/1998 11.53 37.15 0.12 - -- -- -- - 1.70 3/17/1999 NP 11.25 37.43 0.28 <50 <0.5 <0,5 <0.5 <0.5 <5.0 1,60 5/14/1999 NP 11-50 37.18 -0.25 - -- - -- - -- -- 2.40 9/16/1999 NP 11.74 36.94 -0.24 <50 <0.5 <0.5 <0.5 <0.5 <5.0 4.30 1 212211 9 9 9 NP 11.61 37.07 0.13 - -- - - - - 1.99 2/29/2000 NP 11.04 37.64 0.57 <50 <0,5 <0.5 <0.5 <0.5 <2.5 4.30 617/2000 Well inaccessible 9/25/2000 Well inaccessible 12/21/2000 Well inaccessible 3/27/2001 P 11.40 37.28 -0,36 - <50.0 <0.500 <0.500 <0.500 <0.500 <2.00' 3,2 6/20/2001 11.47 37.21 -0,07 - __ - - 9/1212001 P 11.50 37.18 -0.03 -- <50 <0.50 <0.50 <0.50 <0.50 19 1.4 12119/2001 11.40 37.26 0.10 - - - 3/14/2002 P 11,51 37.17 -0.i 1 <50 <0.5 <0.5 <0.5 <0.5 <0,50' 0.83 6/28/2002 - -- 9!11!2002 P 11.41 37.27 - <50 <0.5 <0,5 <0.5 <0.5 <0,5' 1.5 12/17/2002 - - K:V5 SP AR00 o2ono murV4 4TH 02T&I,1�3.7d