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• _ Table 2 HISTORIC FLUID LEVELS AND SELECTED ANALYTICAL RESULTS February 1990 Through March 2005 Former 76 Station 6981 Date TQC Depth to LPH Ground- Change TPH-G TPPH Benzene Toluene Ethyl- Total MTBE MTBE Comments Sampled Elevation Water Thickness water to 8260B benzene Xylenes 8021B 8260B Elevation Elevation (feet) (feet) (feet) (feet) (feet) (µgll) (µg11) (pg/1) (µg/1) (µg/l) (µg/1) (Ng/1) (µg11) VW-3 continued 09/24/03 1132 33 78 000 -2246 -234 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<2 0 12/30/03 1132 3325 000 -21 93 053 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 - ND<2 0 03/09/04 1132 3239 000 -21 07 086 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<2 0 06/16/04 1132 -- 000 __ __ __ __ __ __ __ Dry well 09/20/04 1132 - - -- -- __ __ _ __ __ Dry well 12/30/04 1132 - -- -- -- -- -- -- -- -- -- -- Dry well 03/24/05 1132 -- -- __ __ __ __ __ __ Dry well VW-4 (Screen Interval in feet 25 5-50 5) 07/24/96 -- - -- - -- - -- -- -- -- Dry 10/23/96 -- -- -- __ __ __ __ _ __ __ __ Sampled Semi-annually 01/21/97 -- 3607 000 -- -- 3000 - ND<0 5 5 3 31 530 ND<5 0 -- 07/16/97 34 13 000 -- -- 670 -- ND<0 5 45 61 98 5 1 -- 10/15/97 - -- -- - -- -- - - -- - - -- -- Dry 12/08/97 -- - -- - -- -- -- -- - Well Connected To VES 03/05/98 31 82 000 -- -- ND<50 -- ND<0 50 ND<0 50 ND<0 50 ND<0 50 35 39 05/27/98 -- 28 55 000 -- 3900 -- ND<10 ND<10 ND<10 ND<10 ND<10 ND<5 0 07/2I/98 -- 28 53 000 -- -- 2500 9 7 ND<0 50 ND<0 50 57 ND<5 0 ND<2 0 10/14/98 - 2954 000 -- -- 14000 -- ND<50 ND<50 120 370 ND<250 ND<66 01/25/99 -- 28 74 000 -- -- 20000 -- ND<50 100 ND<50 440 ND<250 15 04/19/99 -- 2623 000 - -- 14000 - ND<50 ND<50 82 170 ND<250 15 07/15/99 -- 2754 000 -- 17000 ND<50 ND<50 ND<50 ND<50 ND<250 19 10/25/99 -- 2936 000 -- -- 22000 -- ND<50 ND<50 70 290 ND<250 27 01/27/00 -- 28 85 000 - -- 19000 - 66 ND<50 190 1300 43 51 06/26/00 -- 26 09 000 -- -- 3470 -- ND<5 00 ND<5 00 ND<5 00 432 683 1110 6981 Page 34 o£36