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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/1) (ugA) (ug11) (ug/1) (ug/1) (ug11) (ppm) MONITORING (Feet) (Feet) (Feet) MW-4 05/01/90 675 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 06/19/92 675 DRY --- --- -- — — - — --- ANA MW-4 09/18/92 676 DRY — -_ — --- --- — --- ANA MW-4 12/09/92 675 DRY --- - - --- --- --- — — ANA MW-4 03/11/93 675 DRY --- - -- — — - - --- PACE MW-4 06/15193 675 2801 -2126 — -- — - — - --- PACE MW-4 09/15/93 675 2850 -21 75 — — -- - — --- PACE MW-4 12/22/93 675 2833 -2158 ND<50 ND<O 5 ND<O 5 ND<0 5 ND<O 5 — -- PACE MW-4 04/01/94 675 2745 -2070 --- --- — --- --- --- MW-4 07/27/94 675 2746 -2071 190 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- 23 PACE MW-4 11/30/94 675 2797 -21 22 --- -- --- - --- --- -- MW-4 02/15/95 675 2685 -2010 ND<50 ND<O 50 ND<O 50 ND<O 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<O 50 ND<O 50 ND<O 50 ND<1 0 -- 51 ATI MW 4 (e) 10/20/95 675 2450 -1775 ND<50 ND<O 50 ND<0 50 ND<O 50 ND<1 0 ND<5 0 60 ATI MW-4 10/20/95 675 2524 -1849 ND<50 ND<0 50 ND<O 50 ND<0 50 ND<1 0 ND<5 0 65 ATI MW-4 (e) 04/23/96 675 2113 -1438 ND<500 ND<O 5 ND<O 5 ND<O 5 ND<O 5 14 --- SPL MW-4 04123/96 675 -- --- ND<500 ND<O 5 ND<O 5 ND<O 5 ND<0 5 ND<10 SPL MW-4 07/12/96 675 2042 -1367 --- — — - - — - MW-4 10/18/96 675 1963 -1288 130 ND<O 5 ND<1 0 ND<1 0 ND<1 0 N0<10 53 SPL MW-4 02/26/98 675 1301 -626 ND<50 ND<O 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<O 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 07/14/99 675 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 MW-4 01/20/00 675 1540 -865 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 320 --- PACE MW-4 04/11/00 675 1431 -756 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<O 5 64 --- PACE I Blaine Tech Services Inc Report 000411-F-1 BP Oil 11192 at 1403 Country Club Blvd Stockton California Page 3