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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) (µg/1) (µg/1) (µg/1) (µg/1) (µg/1) (µg/1) (µg/1) (µ8J1). VW-7 continued 10/26/2005 11.67 34.35 0.00 -22.68 -0.24 4900 __ ND<2.5 4.8 64 55 -- ND<2.5 1/5/2006 11.67 33.40 0.00 -21.73 0.95 9800 -- ND<5.0 ND<5.0 150 160 -- ND<5.0 4/10/2006 11.67 30.24 0.00 -18.57 3.16 3500 -- 1.4 5.7 89 150 -- ND<0.50 7/26/2006 11.67 28.74 0.00 -17.07 1.50 8100 -- 5.4 77 200 440 -- ND<0.50 10/19/2006. 11.67 30.78 0.00 -19.11 -2.04 8100 -- 8.1 13 160 280 -- ND<0.50 1/16/2007 11.67 30.22 0.00 -18.55 0.56 11000 -- 14 7.2 130 240 -- ND<0.50 4/10/2007 11.67 29.69 0.00 -18.02 0.53 8500 -- 17 6.1 99 180 -- ND<0.50 8/27/2007 11.67 31.34 0.00 -19.67 -1.65 5500 -- 33 7.8 96 150 -- ND<0.50 10/29/2007 11.67 31.91 0.00 -20.24 -0.57 6800 -- 44 7.4 96 130 -- ND<0.50 1/7/2008 11.67 31.20 0.00 -19.53 0.71 6600 -- 23 5.0 79 110 -- ND<0.50 5/7/2008 11.67 29.68 0.00 -18.01 1.52 7200 -- 30 5.3 94 130 -- ND<0.50 8/4/2008 11.67 30.65 0.00 -18.98 -0.97 3900 -- 40 5.0 93 85 -- ND<0.50 10/21/2008 11.67 31.18 0.00 -19.51 -0.53 7900 -- 19 3.6 87 79 -- ND<2.5 • 2/10/2009 11.67 32.08 0.00 _20.41 -0.90 4100 -- 4.6 1.2 52 31 -- ND<0.50 4/16/2009 11.67 31.60 0.00 .-19.93 0.48 4200 -- 3.5 1.1 36 19 -- ND<0.50 7/28/2009 11.67 32.85 0.00 -21.18 -1.25 1900 3.4 1.3 16 6.3 ND<0.50 Resampled on 9/22/09 1/20/2010 11.67 32.80 0.00 -21.13 0.05 2500 -- 3.7 ND<0.50 18 15 -- ND<0.50 7/7/2010 11.67 30.96 0.00 -19.29 1.84 2700 ND<0.50 ND<0.50 34 33 2.4 1/20/2011 11.67 30.34 0.00 -18.67 0.62 2300 -- 1.2 0.62 31 26 -- ND<0.50 !'14'12 4100 • l 2'{ S} loo 6981 Page 54 of 54 f� } T RC