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TABLE -SUMMARY OF RESULTS OF GROUNDWATER MONITORING WELL DATEOF CASING DEPTH TO GROUNDWATER TPH-G 8 T E X MTBE DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ug/l) (ugli) NO) (ugly (ugly NO (ppm) MONITORING (Feet) (Feet) (Feet) MW-6 08105!91 5.80 29.82 -24.02 ND ND NO ND NO - --- PRE MW-6 08/15/91 5.80 --- --- -_ --- _- -- MW-6 12/09/91 5.80 30.42 -24.62 ND ND ND NO NO -- PRE MW-6 03/09/92 5.80 29.53 -23.73 ND ND ND ND ND - --- PRE MW-6 06/19/92 5.80 29.24 -23.44 ND<50 ND<0,5 ND<0.5 ND<0.5 ND<0.5 --- --- ANA MW-6 09118/92 5.80 31.03 -25.23 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- ANA MW-6 12/09/92 5.80 31.42 -25.62 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- ANA MW-6 03/11/93 5.80 28.95 -23.15 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - PACE MW-6 06/15/93 5.80 26.91 -21.11 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 PACE MW-6 09/15/93 5.80 27.29 -21.49 ND<50 ND<0.5 NDe0.5 ND<0.5 ND<0.5 --- --- PACE MW-6 12/22/93 5.80 27.17 -21.37 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 PACE - - MW-6 04/01/94 5.80 26.29 -20.49 --- --- --- --- - -_ MW-6 07/27/94 5.80 26.32 -20.52 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - 3.6 PACE MW-6 11/30/94 5.80 26.80 -21.00 --- - _- --- --- _ -- MW-6 02/15/95 5.80 25.73 -19.93 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 --- 3.9 ATI MW-6 04/21/95 5,80 23.74 -17.94 --- __ _ --- --- --- --- --- MW-6 07/21/95 5.80 22.98 -17.18 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 6.3 ATI MW-6 (e) 10/20/95 5.80 23.39 -17.59 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 6.7 7.3 ATI MW-6 10/20/95 5.80 --- --- ND<50 1.5 0.67 ND<Q50 ND<1.0 ND<5.0 6.5 ATI MW-6 (e) 04/23196 5.80 20.00 -14.20 ND<500 ND<5 ND<5 ND<5 13 2700 SPL MW-6 04/23/96 5.80 --- --- ND<500 ND<12 ND<12 ND<12 ND<12 4100 - SPL MW-6 07/12/96 5.80 20.22 -14.42 --- --- -__ - - _-- --- MW-6 10/18/96 5.80 19.42 -13.62 2300 10 ND<1.0 ND<1.0 ND<1.0 7900 4.4 SPL MW-6 02/26198 5.80 11.60 -5.80 490 ND<0.5 ND<1.0 ND<11.0 ND0.0 590 4.9 SPL QC-1 (d) 02/26/98 --- --- --- 460 ND<0.5 ND<1.0 ND<1.0 ND<1.0 680 --- SPL MW-6 07/07/98 5.80 11.55 -5.75 ND<50 ND-c0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 3.7 SPL MW-6 01/19/99 5.80 13.49 -7.69 7300 ND<1.0 ND<1.0 ND<1.0 ND<1.0 9700 --- SPL MW-6 07/14/99 5.80 12.55 -6.75 1000 ND<1.0 ND<1.0 ND<1.0 ND<1.0 1100 --- SPL MW-6 10/07/99 5.80 14.10 -8.30 4900 ND0.0 ND<1.0 ND<1.0 ND<1.0 4200 --- SPL Blaine Tech Services,Inc„Report 991007-N-2,BP Oil 11192 at 1403 Country Club Blvd.,Stockton,California Page 5