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TABLE 1 -SUMMARY OF RESULTS OF GROUNDWATER MONITORING 7 WELL DATE OF CASING y DEPTH TO GROUNDWATER TPH-G TPH-D B T E X MTBE TOG HVOCS DO LAB 1D SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ug/1) (ug/1) (ug/1) (ug/1) (ugll) (ug/1) (ug/1) (ug/1) (ug/1) (ppm) MONITORING (Feet) (Feet) (Feet) MW-1 12/21/92 9.10 11.18 -2.08 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- -- -- -- PACE MW-1 05/17/93 9.10 8.41 0.69 ND<50 -- ND<0.5 ND<0.5 0.6 2.1 --- -- --- -- PACE MW-1 09/15/93 9.10 9.78 -0.68 ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- -- - PACE MW-1 01/12/94 9.10 10.49 -1.39 ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - 3.7 PACE MW-1 05/12/94 9.10 9.77 -0.67 ND<50 -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- --- --- 4.0 PACE MW-1 10/07/94 9.10 10.54 -1,44 ND<50 --- ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- -- --- 3.9 PACE MW-1 12/08/94 9.10 10.75 -1.65 1300 - 0.8 2.4 ND<0.5 ND<0.5 - - 4.1 PACE MW-1 02/21/95 9.10 8.44 0.66 69 - ND<0.50 ND<0.50 ND<0.50 ND<1.0 (c) - - 8.2 ATI MW-1 06/09/95 9.10 7.94 1.16 -- - --- - - - -- - - -- -- MW-1 08/31/95 9.10 9.81 -0.71 91 - 0.70 ND<0.50 ND<0.50 ND<1.0 200 - -- 8.5 ATI MWA 11102/95 9.10 10.38 -1.28 --- - -- - -- - -- -- -- MW-1 02/28/96 9.10 6.98 2.12 ND<50 --- ND<0.5 ND<1 ND<1 ND<1 130 -- -- 8.5 SPL MW-1 09/05/96 9.10 9.31 -0.21 ND<50 -- ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 --- --- 7.7 SPL MW-1 03/25/97 9.10 6.47 2.63 ND<50 --- ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 -- --- 6.8 SPL MW-1 10/15/97 9.10 10.65 -1.55 420 ND<100 ND<0.5 ND<1.0 ND<1.0 ND<1.0 9100 -- - 7.1 SPL MW-1 01/15198 9.10 9.40 -0.30 ND<2500 - ND<0.5 ND<1.0 ND<1.0 ND<1.0 1200 - - 6.3 SPL MW-1 05/07/98 9.10 6.45 2.65 2700 - ND<0.5 ND<1.0 ND<1.0 ND<1.0 2900 - --- SPL MW-1 09/03/98 9.10 8.67 0.43 17000 - 1.2 ND<1.0 ND<1.0 ND<1.0 13000 --- -- 5.2 SPL MW-1 12/23/98 9.10 9.08 0.02 17000 - ND<0.5 ND<1.0 ND<1.0 ND<1.0 17000 - -- -- SPL MVV-1 (g) 12/31/98 910 --- --- --- -- -- -- - - -- -- - - - MW-1 (g) 03/22/99 9.10 Blaine Tech Services, Inc., Report 990322-R-2, BP 11195 at 16500 1-5, Lathrop,California Page 1