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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) (ug11) (ug11) (ug/1) (ug11) (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 -2515 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<O 5 ND<O 5 ND<0 5 ND<O 5 --- -- ANA MW-7 09/18/92 621 3198 -2577 90 ND<O 5 ND<0 5 ND<O 5 ND<O 5 — ANA MW-7 12/09/92 621 3233 -2612 ND<50 ND<O 5 ND<O 5 ND<0 5 ND<O 5 -- – ANA QC-1 (d) 12/09/92 --- --- -- ND<50 ND<0 5 ND<O 5 ND<0 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 -2153 71 14 08 28 24 -- -- PACE QC-1 (d) 06/15193 --- --- -- 120 19 ND<O 5 59 46 -- -- PACE MW-7 09/15/93 621 2816 -2195 170 12 ND<O 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) 04/01/94 --- --- --- 330 26 09 28 42 — --- PACE MW-7 07/27/94 621 2721 -2100 72 ND<O 5 ND<O 5 ND<O 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 02/15/95 621 2658 -2037 90 ND<0 50 ND<O 50 21 17 -- 34 ATI MW-7 04/21/95 621 2461 -1840 53 065 ND<O 50 14 14 – 49 ATI MW-7 07/19/95 621 2374 -1753 81 059 ND<O 50 055 ND<1 0 -- 54 ATI QC-1 (d) 07/19/95 -- --- --- 82 ND<O 50 ND<O 50 054 ND<1 0 – -- ATI MW-7 (e) 10/20/95 621 2415 -1794 110 ND<0 50 ND<0 50 ND<O 50 ND<1 0 160 54 ATI MW-7 10/20/95 621 --- — 89 ND<0 50 ND<O 50 ND<O 50 ND<1 0 110 52 ATI MW-7 (e) 04/23/96 621 2078 -1457 ND<500 ND<O 5 ND<0 5 ND<0 5 ND<O 5 150 --- SPI, MW-7 04/23/96 621 --- — ND<500 ND<O 5 ND<0 5 ND<0 5 ND<O 5 160 — SPL MW-7 07/12/96 621 2118 -1497 ND<50 ND<O 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<O 5 ND<1 0 ND<1 0 ND<1 0 200 53 SPL QC-1 (d) 10/18/96 --- --- -- 240 ND<O 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 07107/98 621 1220 -599 1800 ND<O 5 ND<1 0 ND<1 0 ND<1 0 2400 35 SPL MW-7 01/19199 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 Blame Tech Services,Inc,Report 000714-N-1, BP Oil 11192 at 1403 Country Club Blvd,Stockton,Califomia Page 6