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i • • _ 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) (ug/1) (ug/1) (uglt) (ug/1) (irg11) (ppm) MONITORING (Feet) (Feet) (Feet) MW-6 08/05/91 580 2982 -2402 ND ND ND ND ND --- PRE MW-6 08/15/91 580 --- --- --- — --- MW-6 12109/91 580 3042 -2462 ND ND ND ND ND --- — PRE MW 6 03/09/92 580 2953 -2373 ND ND ND ND ND --- --- PRE MW-6 06/19/92 580 2924 -2344 ND<50 ND<O 5 ND<0 5 ND<O 5 N0<05 --- --- ANA MW-6 09118192 580 31 03 -2523 ND<50 ND<0 5 ND<O 5 ND<O 5 N0<0 5 --- --- ANA MW-6 12/09/92 580 3142 -2562 ND<50 ND<0 5 ND<0 5 ND<O 5 ND<O 5 --- --- ANA MW-6 03/11193 580 2895 -2315 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- --- PACE MW-6 06115/93 580 2691 -21 11 ND<50 ND<0 5 ND<0 5 ND<0 5 N0<0 5 - --- PACE MW-6 09/15/93 580 2129 -2149 ND<50 ND<O 5 ND<O 5 ND<O 5 N0<0 5 PACE MW-6 12/22/93 580 27 17 -2137 ND<50 ND<O 5 ND<0 5 ND<O 5 ND<0 5 --- PACE MW-6 04/01/94 580 2629 -2049 — - — — --- --- --- --- MW-6 07127194 580 2632 -2052 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<0 5 -- 36 PACE MW 6 11/30/94 580 2680 -21 00 --- --- --- --- MW-6 02/15/95 580 2573 -1993 ND<50 ND<0 50 ND<O 50 ND<0 50 ND<1 0 --- 39 ATI MW-6 04/21/95 580 2374 -1794 --- --- --- --- MW-6 07/21/95 580 2298 -17 18 ND<50 ND<0 50 ND<O 50 ND<O 50 ND<1 0 --- 63 ATI MW-6 (e) 10120/95 5 80 2339 -17 59 ND<50 ND<0 50 ND<0 50 ND<O 50 ND<1 0 67 73 ATI MW-6 10120/95 580 --- -- NQ<50 15 067 ND<O 50 ND<1 0 ND<5 0 65 ATI MW-6 (e) 04/23/96 580 2000 -1420 ND<500 ND<5 ND<5 ND<5 13 2700 --- SPL MW-6 04/23/96 580 --- --- ND<500 ND<12 ND<12 ND<12 ND<12 4100 SPL MW-6 07/12/96 580 2022 -1442 --- --- --- — MW-6 10/18/96 580 1942 -1362 2300 10 ND<1 0 ND<1 0 ND<1 0 7900 44 SPL MW 6 02.126198 580 1160 -580 490 ND<0 5 ND00 ND<1 0 ND<1 0 590 49 SPL QC-1 (d) 02/26/98 --- -- -- 460 ND<0 5 ND<1 0 ND<1 0 ND<1 0 680 --- SPL MW-6 07/07/98 580 1155 -575 NO<50 ND<0 5 ND00 ND<1 0 Nil<1 0 ND<10 37 SPL MW-6 01/19/99 580 1349 -769 7300 ND00 ND<1 0 ND<1 0 ND<1 0 9700 --- SPL MW-6 07/14/99 580 1255 -675 1000 ND<1 0 ND<1 0 ND<1 0 ND<1 0 1100 SPL MW-6 10/07199 580 1410 -830 4900 ND<1 0 ND<1 0 ND<1 0 ND<1 0 4200 SPL MW 6 01/20/00 580 1433 -853 ND<50 NO<O 5 ND<0 5 ND<O 5 ND<O 5 6200 --- PACE MW 6 04/11/00 580 1525 945 77 N0<05 N0<05 ND<O 5 ND<O 5 180 -- PACE MW-6 07/14/00 580 1197 -6 17 55 ND<O 5 ND<O 5 ND<0 5 ND<O 5 150 --- PACE MW-6 10126/00 580 1360 -780 1300 10D 79 11 72 2200 --- PACE MW 6 01116/01 580 1339 -759 1200 206 ND<0 5 ND<O 5 ND<O 5 1700 -- PACE MW 6 04/12/01 580 1193 613 120 ND<0 5 ND<0 5 ND<O 5 ND<1 5 157 --- PACE Blame Tech Services Inc, Report 010412-K 1 BP Oil 11192 at 1403 Country Club Blvd ,Stockton California Page 7