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i TABLE -SUMMARY OF RESULTS OF GROUNDWATER MONITORING r WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G B T E k MTBE DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ugA) (1911) (ugl) (ugA) (UgA) (u9A) (ppm) MONITORING (Feet) (Feet) (Feet) MW-4 05/01/90 6.75 26.31 -19.56 NO NO NO ND NO ___ _ PRE MW-4 08/05/91 6.75 DRY -- --- --- --- - --- - PRE MW-4 12/09/91 6.75 DRY - MW-4 03!09/92 6.75 DRY _� - _ -- PRE - --- --- --- --- ANA MW-4 06/19/92 6.75 DRY -- - --- --- -- --- --- --- ANA MW-4 09/18/92 6.75 DRY - - --- -- -- --- ANA MW-4 12/09/92 6.75 DRY - --- --- --- --- -- -- ANA MW-4 03/11/93 6.75 DRY -- --- --- --- --- - --- --- PACE MW-4 06/15/93 6.75 28.01 -21.26 -- --- -- --- --- --- PACE MW-4 09/15/33 6.75 28.50 -21.75 --- --- - --- --- --- -- PACE MW-4 12122!93 6.75 28.33 -21.58 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- - PACE MW-4 04/01/94 6.75 27.45 -20.70 -- MW-4 07/27/94 6.75 27.46 -20.71 190 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- 2.3 PACE MW-4 11/30/94 6.75 27.97 -21.22 --- MW-4 02/15/35 6.75 26.85 -20.10 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 --- 2.8 ATI MW-4 04/21/95 6.75 24.77 -18.02 -- --- --- --- --- --- --- MW-4 07/19/95 6.75 24.07 -17.32 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- 5.1 ATI MW-4 (e) 10/20/95 6.75 24.50 -17.75 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<5.0 6.0 ATI MW-4 10/20/95 6.75 25.24 -18.49 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<5.0 6.5 ATI MW-4 (e) 04/23/96 6.75 21.13 -14.38 0<500 ND<0.5 ND<0.5 ND<0.5 ND<0.5 14 --- SPL MW-4 04/23/96 6.75 ND<5W ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<10 - SPL MW-4 07/12/96 6.75 20.42 -13.67 -- ___ --- --_ MW-4 10/18/96 6.75 19.63 -12.88 130 ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 5.3 SPL MW-4 02/26/98 6.75 13.01 -6.26 ND<50 ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 4.4 SPL MW-4 07/07/38 6.75 12.61 -5.86 ND<50 ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 3.7 SPL MW-4 01119M 6.75 14.59 -7.84 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 26 --- SPL MW-4 07/14/99 6.75 13.55 -6.80 ND<50 ND<1.0 ND<1.0 ND<1.0 ND<1.0 83 - SPL MW-4 10/07/99 6.75 15.08 -8.33 220 ND<1.0 ND<1.0 ND<1.0 ND<1.0 170 - SPL Blalne Tech Servioes,Inc.,Report 991007-N-2,BP Oil 11192 at 1403 Country Club Blvd.,Stockton,California Page 3