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TABLE 1 -SUMMARY OF RESULTS OF GROUNDWATER MONITORING WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G B T E X MTBE DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ug/I) (ug/1) (ug/1) (ug/0 (ug/1) (ug/1) (ppm) MONITORING (Feet) (Feet) (Feet) I MW-6 08/05/91 5.80 29.82 -24.02 NO ND ND NO ND - - PRE MW-6 08115/91 5.80 --- - - MW-6 12/09/91 5.80 30.42 -24.62 NO ND NO NO NO - -- PRE MW-6 03109192 5.80 29.53 -23.73 NO ND ND NO NO --- PRE MW-6 06!19192 5.80 29.24 -23.44 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- ANA kiw-6 09/18/92 5.80 31.03 -25.23 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- -- ANA MW-6 12/09192 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 ND<0.5 ND<0.5 ND<0.5 --- -- PACE MW-6 12122193 5.80 27.17 -21.37 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE tv1W-6 04101/94 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!30194 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 04121/95 5.80 23.74 -17.94 --- - -- -- - MW-6 07121195 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<0.50 ND<1.0 ND<5.0 6.5 ATI MW-6 (e) 04/23/96 5.80 20.00 -14.20 ND<500 NO<5 ND<5 ND<5 13 2700 --- SPL MW-6 04/23196 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 02126198 5.80 11.60 -5.80 490 ND<0.5 ND<1.0 ND<1.0 ND<1.0 590 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<0.5 NO<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-7 08/05/91 6.21 30.82 -24.61 70 19 NO NO ND --- - PRE MW-7 08/15/91 6.21 --- --- --- --- - -- - -- --- PRE MW-7 12/09/91 6.21 31.36 -25.15 ND 19 NO 1.2 ND -- - PRE MW-7 03/09/92 6.21 30.15 -23.94 ND ND NO NO NO -- --- PRE MW-7 06/19/92 6.21 30.19 -23.98 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- -- ANA MW-7 09/18/92 6.21 31.98 -25.77 90 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - --- ANA MW-7 12/09/92 6.21 32.33 -26.12 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - ANA QC-1 (d) 12/09/92 --- --- --- ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- ANA MW-7 03/11/93 6.21 29.85 -23.64 110 3.1 0.8 2.2 1.4 -- - PACE MW-7 06/15/93 6.21 27.74 -21.53 71 1.4 0.8 2.8 2.4 - --- PACE Blaine Tech Services, Inc.,Report 990119-J-1, BP Oil 11192 at 1403 Count Club Blvd. Stockton California P Country Page 4