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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 TPA-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) (141) (µg/1) (µg/1) (µg/1) MW-2 continued 3/5/1998 11.56 32.68 0.00 -21.12 3.46 10000 -- 1900 ND<50 150 180 280 300 5/27/1998 11.56 29.31 0.00 -17.75 3.37 8600 -- 1400 18 56 65 47 270 7/21/1998 11.56 28.31 0.00 -16.75 1.00 490 -- 85 5.6 2.9 24 220 180 10/14/1998 11.56 29.26 0.00 -17.70 -0.95 2900 -- 620 17 36 56 380 190 1/25/1999 11.56 28.43 0.00 -16.87 0.83 2200 -- 610 21 24 72 270 170 4/19/1999 11.56 26.10 0.00 -14.54 2.33 - 1700 -- 440 20 18 57 310 ,180 7/15/1999 11.56 27.37 0.00 -15.81 -1.27 620 -- 130 ND<2.5 5.1 17 120 180 10/25/1999 11.56 29.07 0.00 -17.51 -1.70 710 -- 120 21 6 29 240 200 1/27/2000 11.56 28.53 0.00 -16.97 0.54 490 -- 62 20 5.2 24 170 140 6/26/2000 11.56 25.84 0.00 -14.28 2.69 489 -- 38 3 tDm.500 5.32 107 87.9 9/22/2000 11.56 29.01 0.00 -17.45 -3.17 8000 -- .ND<20 ND<20 ND<20 370 120 100 12/26/2000 11.56 28.90 0.00 -17.34 0.11 5270 -- 47.6 10.7 ND<10.0 21.7 ND<100 78.5 3/7/2001 11.56 28.59 0.00 -17.03 0.31 861 -- 42.8 2.59 ND<2.50 17 67.1 73.2 - • 6/26/2001 11.56 29.65 0.00 -18.09 -1.06 400 -- 27 2.1 1.1 10 53 47 9/12/2001 11.56 31.53 0.00 -19.97 -1.88 360 -- 25 1.6 ND<0.50 8.4 51 62 12/12/2001 11.56 31.78 0.00 -20.22 -0.25 700 -- 77 ND<2.0 ND<2.0 23 75 94 3/20/2002 11.56 30.55 0.00 -18.99 1.23 650 -- 120 2.1 ND<2.0 17 100 78 6/6/2002 11.56 31.02 0.00 -19.46 -0.47 -- 390 53 1.1 ND<0.50 3.6 -- 56 . 9/30/2002 11.56 33.54 0.00 -21.98 -2.52 -- 10000 900 57 490 1800 -- 60 12/30/2002 11.56 33.05 0.00 -21.49 0.49 -- 4100 460 ND<2.5 . 35 250 -- 49 3/29/2003 11.56 31.99 0.00 -20.43 1.06 -- 960 43 0.87 5.7 24 -- 31 6/25/2003 11.56 32.47 0.00 -20.91 -0.48 -- 410 10 ND<0.50 ND<0.50 3.1 -- 19 9/24/2003 11.56 34.78 0.00 -23.22 -2.31 -- - 2100 81 ND<2.5 70 97 10 6981 Page 6 of 54 I T RK20'