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TABLE 1 -SUMMARY OF RESULTS OF GROUNDWATER MONITORING r 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) (ug11) (ug/1) (ug1l MONITORING (Feet) (Feet) (Feet) ) (Ppm) MW-7 08/05/91 621 3082 -2461 70 19 ND ND ND --- --- PRE MW-7 08/15/91 621 -- --- — -_ __ —_ __- _-_ ___ PRE MW-7 12/09191 621 3136 -25 15 ND 19 ND 12 ND --- --- PRE MW-7 03109/92 621 3015 -2394 ND ND ND ND ND _ PRE MW-7 06/19/92 621 30 19 -2398 ND<50 ND<0 5 ND<O 5 ND<O 5 ND<O 5 -- --- ANA MW-7 09/18/92 621 3198 -2577 90 ND<0 5 ND<0 5 ND<0 5 ND<O 5 -- — ANA MW-7 12109/92 621 3233 -2612 ND<50 ND<O 5 ND<0 5 ND<O 5 ND<O 5 -- - ANA QC-1 (d) 12/09/92 --- -- --- ND<50 ND<O 5 ND<0 5 ND<O 5 ND<O 5 -- --- ANA MW-7 03/11/93 621 2985 -2364 110 31 08 22 14 - --- PACE MW-7 06/15/93 621 2774 -21 53 71 14 08 28 24 --- --- PACE QC-1 (d) 06/15/93 --- --- --- 120 19 ND<O 5 59 46 — PACE MW-7 09/15/93 621 2816 -21 95 170 12 ND<0 5 58 25 - --- PACE QC-1 (d) 09/15/93 --- -- -- 160 1 ND<O 5 55 26 --- --- PACE MW-7 12/22/93 621 2803 -21 82 110 19 13 38 10 -- --- PACE MW-7 04/01/94 621 2715 -2094 340 25 1 30 43 -- 38 PACE QC-1 (d) 04/01194 -- --- --- 330 26 09 28 42 --- --- PACE MW-7 07/27/94 621 2721 -21 00 72 ND<0 5 ND<0 5 ND<0 5 ND<O 5 -- 29 PACE MW-7 11/30/94 621 2758 -2137 140 ND<0 5 08 44 83 --- 38 PACE QC-1 (d) 11/30/94 --- --- --- 140 06 1 5 93 --- --- PACE MW-7 02/15195 621 2658 -2037 90 ND<0 50 ND<O 50 21 17 --- 34 ATI MW-7 04/21/95 621 2461 -1840 53 065 ND<0 50 14 14 --- 49 ATI MW-7 07/19/95 621 2374 -1753 81 059 ND<0 50 055 N0<1 0 --- 54 ATI QC-1 (d) 07/19/95 --- --- --- 82 ND<0 50 ND<0 50 054 ND<1 0 --- --- ATI MW-7 (e) 10/20/95 621 2415 -1794 110 ND<0 50 ND<0 50 ND<0 50 ND<1 0 160 54 ATI MW-7 10120195 621 --- -- 89 ND<0 50 ND<0 50 ND<0 50 ND<1 0 110 52 ATI MW-7 (e) 04/23/96 621 2078 -1457 ND<500 ND<0 5 ND<O 5 ND<0 5 ND<O 5 150 --- SPL MW-7 04/23196 621 --- -- ND<500 ND<0 5 ND<O 5 ND<O 5 ND<O 5 160 -- SPL MW-7 07/12/96 621 21 18 -1497 ND<50 ND<0 5 ND<1 ND<1 ND<1 ND<10 59 SPL QC-1 (d) 07/12/96 --- -- --- ND<50 ND<0 5 ND<1 ND<1 ND<1 ND<10 -- SPL MW-7 10/18/96 621 2070 -14 49 220 ND<O 5 ND<1 0 ND<1 0 ND<1 0 200 53 SPL QC-1 (d) 1008196 -- --- -- 240 ND<0 5 ND<1 0 ND<1 0 ND<1 0 200 -- SPL MW-7 02/26/98 621 1300 -679 120 ND<O 5 ND<1 0 ND<1 0 ND<1 0 95 45 SPL MW-7 07/07198 621 1220 -599 1800 ND<O 5 ND<1 0 ND<1 0 ND<1 0 2400 35 SPL MW-7 01/19/99 621 1433 -812 3200 ND<1 0 ND<1 0 ND<1 0 ND<1 0 3800 --- SPL MW-7 (h) 07/14/99 621 1313 -692 -- --- --- _— _— ___ MW-7 07/26/99 621 1330 -709 21000 ND<1 0 ND<1 0 72 24 18000 --- SPL Blaine Tech Services, Inc, Report 010116-K-1 BP Oil 11192 at 1403 Country Club Blvd Stockton,California Page 7