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Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS February 1990 Through January 2011 Former 76 Station 6981 Date TOC Depth to LPH Ground- Change in Comments Sampled Elevation Water Thickness water Elevation TPH-G TPH-G - Ethyl- Total MTBE MTBE Elevation 8015 (GC/MS) Benzene Toluene benzene Xylenes (8021B) (8260B) (feet) (feet) (feet) (feet) (feet) (pg(I) (µg/1) (gg/1) (µg/1 (µg/1) (µg/1) (µg/1) (µg/1) PTW-1 continued • 10/25/1999 -- 29.49 -- -- -- ND<50 -- ND<0.50 0.85 ND<0.50 1.1 ND<2.5 ND<2.0 1/27/2000 -- 28.97 -- -- -- ND<50 -- ND<0.50 0.6 ND<0.50 1.1 ND<2.5 ND<2.0 6/26/2000 -- 26.23 -- -- -- ND<50.0 -- ND<0.500 0.904 ND<o.500 0.955 ND<5.0 4.75 9/22/2000 11.88 28.76 0.00 -16.88 -- ND<50 -- ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<2.5 ND<2.0 12/26/2000 11.88 28.65 0.00 -16.77 0.11 ND<50.0 -- ND<0.500 ND<0.500 ND<0.500 ND<o.500 ND<5.0 ND<2.0 3/7/2001 11.88' 28.37 0.00 -16.49 0.28 ND<50.0 -- ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<5.0 ND<2.0 6/26/2001 11.88 2936 0.00 -17.48 -0.99 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 12 18 9/12/2001 11.88 31.32 0.00 -19.44 -1.96 ND<50 -- ND<0.50 ND<0.50 ND<0.50 ND<0.50 15 20 12/12/2001 11.88 31.55 0.00 -19.67 -0.23 ND<50 -- ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<5.0 7.5 3/20/2002 11.88 30.34 0.00 -18.46 1.21 ND<50 -- ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<5.0 ND<2.0 6/6/2002 11.88 30.82 0.00 -18.94 -0.48 ND<50 ND<0.50 1.4 ND<0.50 1.4 -- ND<2.0 9/30/2002 11.88 33.35 0.00 -21.47 -2.53 ND<50 0.79 1.4 ND<0.50 2 3.6 12/30/2002 11.88 32.92 0.00 -21.04 0.43 -- ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<2.0 3/29/2003 11.88 31.97 0.00 -20.09 0.95 -- ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<2.0 i 6/25/2003 11.88 32.26 0.00 -20.38 -0.29 -- ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<2.0 9/24/2003 11.88 34.56 . 0.00 -22.68 -2.30 -- ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<2.0 12/30/2003 11.88 34.15 0.00 -22.27 0.41 54 ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<2.0 3/9/2004 11.88 33.12 0.00 -21.24 1.03 -- ND<50 ND<0.50 0.93 ND<0.50 1.4 -- ND<2.0 6/16/2004 11.88 33.80 0.00 -21.92 -0.68 -- ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<0.50 9/20/2004 11.88 36.73 0.00 -24.85 -2.93 ND<50 -- ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<0.50 12/30/2004 11.88 36.08 0.00 -24.20 0.65 ND<50 -- ND<0.50 ND<0.50 ND<0.50 1.9 -- ND<0.50 3/24/2005 11.88 34.65 0.00 -22.77 1.43 ND<50 -- ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<0.50 6/28/2005 11.88 33.18 0.00 -21.30 1.47 ND<50 -- ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- ND<0.50 6981 Page 41 of 54 q .TA