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• • s TABLE 1 SUMMARY OF RESULT S 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/1) (ugll) (ug/1) (ug/1) (ug/1) (ug/1) (ppm) MONITORING (Feet) (Feet) (Feet) MW-4 05/01/90 6 75 2631 -1956 ND ND ND ND ND - --- PRE MW-4 08/05/91 675 DRY --- --- --- --- — — _-- PRE MW 4 12/09/91 675 DRY --- - - --- --- - - PRE MW-4 03/09/92 675 DRY --- - -- -- - --- ANA MW-4 06/19192 675 DRY -- --- --- - --- --- --- --- ANA MW-4 09/16/92 675 DRY --- --- --- --- --- - ANA MW-4 12/09/92 675 DRY --- — --- --- — -- -- ANA MW-4 03/11/93 675 DRY --- --- --- - - - PACE MW-4 06115/93 675 2801 -2126 --- - -- --- PACE MW 4 09/15/93 675 2550 -21 75 --- --- — - PACE MW-4 12/22/93 675 2833 -2158 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- --- PACE MW-4 04/01/94 675 2745 -2070 --- --- -- _ _ ___ _-- MW-4 07/27/94 675 2746 -2071 190 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- 23 PACE NiW-4 11130194 675 2797 -21 22 --- --- --- --- --- MW-4 02/15/95 675 2685 -2010 ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 --- 28 ATI MW-4 04/21/95 675 2477 -1802 -- -- - --- MW-4 07/19/95 675 2407 -1732 ND<50 ND<0 50 ND<O 50 ND<0 50 ND<1 0 --- 51 ATI MW 4 (e) 10/20/95 675 2450 -1775 ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 ND<5 0 60 ATI MW-4 10/20/95 675 2524 -1849 ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 ND<5 0 65 ATI Nita-4 (e) 04/23/96 675 2113 -1438 ND<500 ND<0 5 ND<0 5 ND<0 5 ND<0 5 14 --- SPL MW-4 04/23196 675 --- --- ND<500 ND<0 5 ND<O 5 ND<0 5 ND<0 5 ND<10 --- SPL MW-4 07/12196 675 2042 -1367 -- --- --- --- - - --- MW-4 10/18/96 675 1963 -1288 130 ND<0 5 ND<1 0 ND<1 0 ND<1 0 ND<10 53 SPL MW-4 02/26/98 675 1301 -626 ND<50 ND<0 5 ND<1 0 ND<1 D ND<1 0 ND<10 44 SPL MW-4 07/07/98 675 1261 -586 ND<50 ND<0 5 ND<1 0 ND<1 0 ND<1 0 ND<10 37 SPL MW-4 01/19/99 675 1459 -764 ND<50 ND<1 0 ND<1 0 ND<1 0 ND<1 0 26 --- SPL MW-4 07/14/99 675 1355 -680 ND<50 ND<1 0 ND<1 0 ND<1 0 ND<1 0 83 --- SPL MW-4 10/07/99 675 1508 -833 220 ND<1 0 ND<1 0 ND<1 0 ND<1 0 170 --- SPL MW4 01/20100 675 1540 -865 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 320 --- PACE MW 4 04111/00 675 1431 -756 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 64 --- PACE MW-4 07/14/00 675 1302 -627 98 ND<0 5 ND<0 5 ND<0 5 ND<0 5 290 --- PACE MW-4 10/26/00 675 1459 -784 190 20 19 07 32 1000 --- PACE MW-4 01116101 675 1441 -766 400 ND<0 5 ND<0 5 ND<0 5 ND<0 5 510 --- PACE. MW-4 04/12101 675 1297 622 400 ND<0 5 ND<0 5 ND<0 5 ND<1 5 544 -- PACE Blarne Tech Services Inc Report 010412-K-1 BP Oil 11192 at 1403 Country Club Blvd,Stockton,California Page 5