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TABLE *MMARY OF RESULTS OF GROUNDWATER MONITORING ' WELL DATE OF CASING DEPTH TO GROUNDWATER TPN-G B T E X MTBE DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ppm) MONITORING (Feet) (Feet) (Feet) MW-7 08/05/91 621 3082 -2461 70 19 NO NO NO — — PRE MW-7 08/15/91 621 — — — --- — — — — PRE MW-7 12109/91 621 31 36 -2515 ND 19 NO 12 ND — — PRE. MW-7 03/09/92 621 30 15 -2394 NO NO NO ND NO — — 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 09/18/92 621 3198 -2577 90 ND<0 5 ND<0 5 ND<0 5 ND<0 5 — — ANA MW-7 12109/92 621 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 31 08 22 14 — --- PACE MW-7 06/15/93 621 2774 -2153 71 14 08 28 24 --- — PACE QC-1 (d) 06/15/93 --- — — 120 19 ND<0 5 59 46 — — PACE MW-7 09/15/93 621 2816 -2195 170 12 ND<0 5 58 25 - {I} --- PACE QC-1 (d) 09/15193 — — — 160 1 ND<0 5 55 26 — --- PACE MW-7 12/22/93 621 2803 -2182 110 19 13 38 10 -- (I} — PACE MW-7 04/01/94 621 2715 -2094 340 25 1 30 43 496 38 PACE QC-1 (d) 04/01/94 — — — 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<0 5 2855 (f} 29 PACE MW-7 11/30/94 621 2758 -2137 140 ND<0 5 08 44 83 64 (I) 38 PACE QC-1 (d) 11130/94 — --- — 140 06 1 5 93 69 (j} — PACE MW-7 02/15/95 621 2658 -2037 90 ND<0 50 NO<0 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 N0<0 50 055 ND<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) 10/20195 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 04/23196 621 — — ND<500 ND<0 5 ND<0 5 ND<0 5 ND<0 5 160 --- SPL MW-7 07/12196 621 2118 -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 ND<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 07107/98 621 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) 07/14199 621 1313 -692 — — --- -- — — — Blaine Tecta Services,Inc,Report 010723-K-2, BP Oil 11192 at 1403 Country Club Blvd,Stockton California Page 8