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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) (ug/1) (ugli} (ug/1) (ug/1) (ugll) (ppm) MONITORING (Feet) (Feet) (Feet) MW-7 08/05/91 621 3082 -2461 70 19 ND ND ND — — PRE MW-7 08/15/91 621 -- -- --- --- -- -- - --- — PRE MW-7 12/09/91 621 3136 -25 15 ND 19 ND 12 ND -- -- PRE MW-7 03/09/92 621 3015 -2394 ND ND ND ND ND --- - PRE MW-7 06/19/92 621 3019 -2398 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- — ANA MW-7 09/18192 521 3198 -2577 90 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- -- ANA MW-7 12/09/92 621 3233 -2612 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- — ANA QC-1 (d) 12/09/92 -- — --- ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- — ANA MW-7 03/11/93 621 2985 -2364 110 3 1 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 N0<0 5 59 46 — — PACE MW-7 09/15/93 621 2816 -2195 170 12 N0<0 5 58 25 -- — PACE QC-1 (d) 09/15/93 — — --- 160 1 ND<0 5 55 26 — — PACE MW-7 17/22!93 621 2803 -2182 110 1 9 1 3 38 10 -- -- PACE MW-7 04/01/94 621 2715 -2094 340 25 1 30 43 — 38 PACE QC-1 (d) 04/01/94 -- — --- 330 26 09 28 42 — — PACE MW-7 07/27/94 621 2721 -2100 72 ND<0 5 ND<0 5 ND<0 5 ND<0 5 29 PACE MW-7 11/30/94 621 2758 -21 37 140 ND<0 5 08 44 83 — 38 PACE QC-1 (d) 11/30/94 --- — -- 140 06 1 5 93 -- — PACE MW-7 02/15/95 621 2658 -2037 90 ND<0 50 ND<0 50 21 1 7 -- 34 ATI MW-7 04/21195 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) 07119195 — --- --- 82 ND<0 50 ND<0 50 054 ND<1 0 — — ATI MW-7 (e) 10120/95 621 2415 -1794 110 ND<0 50 ND<0 50 ND<0 50 ND<1 0 160 54 ATI MW-7 10/20/95 621 -- — 89 ND<0 50 ND<0 50 ND<0 50 ND<1 0 110 52 ATI MW-7 (e) 04/23196 621 2078 -1457 ND<500 ND<0 5 ND<0 5 ND<0 5 ND<0 5 150 — SPL MW-7 04/23/96 621 — — ND<500 ND<0 5 ND<0 5 ND<0 5 ND<0 5 160 — SPL MW-7 07/12196 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 -1449 220 ND<0 5 ND<1 0 ND<1 0 ND<1 0 200 53 SPL QC-1 (d) 10/18/96 -- --- --- 240 ND<0 5 ND<1 0 ND<1 0 N0<1 0 200 — SPL MW-7 02/26/98 621 1300 -679 120 ND<0 5 ND<1 0 ND<1 0 ND<1 0 95 45 SPL MW-7 07/07198 621 1220 -599 1800 ND<0 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 13 13 -692 — __ __ ___ _-- ___ MW-7 07/26199 621 1330 -709 21000 ND<1 0 ND<1 0 72 24 18000 SPL Blaine Tech Servrces Inc Report 001026-S-1, BP Cil 11192 at 1403 Country Club Blvd Stockton Califomia Page 7