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s s • 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) (ugll) (ug/1) (ug/1) (ug/1) (ug/1) (ug/1) (ppm) MONITORING (Feet) (Feet) (Feet) MW-4 05/01/90 675 2631 -1956 ND ND ND ND ND --- – PRE MW4 08/05/91 675 DRY -- – -- -- – --- --- -- PRE MW-4 12109/91 675 DRY — -- -- -- – --- PRE MW-4 03109/92 675 DRY – -- -- – --- --- --_ ANA MW-4 06/19/92 675 DRY --- -- --- --- -- - ANA MW-4 09/18/92 675 DRY --- -- --- --- -- --- --- --- ANA MW-4 12/09/92 675 DRY --- - - - -- - --- --- ANA MW-4 03/11/93 675 DRY -- – – -- – --- - PACE MW-4 06/15/93 675 2801 -2126 --- – – -- --- --- PACE MW-4 09115/93 675 2850 -2175 --- -- --- --- --- - 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 07127194 675 2746 -2071 190 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- 23 PACE MW-4 11/30/94 675 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 --- --- - --- --- – --- MW4 07/19/95 675 2407 -1732 ND<50 ND<0 50 ND<0 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 10/20195 675 2524 -1849 ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 ND<5 0 65 ATI MW-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 04/23/96 675 -- --- ND<500 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<10 --- SPL MW-4 07/12/96 675 2042 -1367 – --- --- – – --- MW-4 10118/96 675 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 0 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 -784 ND<50 ND<1 0 ND<1 0 ND<1 0 ND<1 0 26 -- SPL MW-4 07/14199 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 MW-4 01/20/00 675 1540 -865 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 320 - PACE MW-4 04/11/00 675 1431 -756 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 64 - PACE MW-4 07114/00 675 1302 -627 98 ND<0 5 ND<0 5 ND<0 5 ND<0 5 290 --- PACE MW-4 10126/00 675 1459 -784 190 20 1 9 07 32 1000 --- PACE MW-4 01/16101 675 1441 -766 400 ND<0 5 ND<0 5 ND<0 5 ND<0 5 510 --- PACE Blame Tech Services,Inc,Report 010116-K-1, BP Oil 11192 at 1403 Country Club Blvd,Stockton,Califomia Page 4