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TABLE 1 GROUNDWATER MONITORING DATA Fortner Beacon Station No 12419 2350 Waterloo Road,Stockton,California i ethyl Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date I(ug1L) (ug1L) (ug1L) (uglL) (ug)L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (uglL) (feet) (feet sea level) (feet sea Level) Comments MW 9 11112/98 ns ns ns as ns ns ns ns as ns as ns ns as 2065 wellhead survey screened 12140198 1500 73 18 160 64 <25 0 no no no no no no na no 4559 2494 slight odor!no sheen interval 0326!99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 no no 4139 2074 no odor!no sheen 41 66 06102/99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 -50 16 <0 50 4074 2009 no odor 1 no sheen 08/31/99 2400 140 21 460 280 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 4562 2497 no comment 12!09199 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <50 13 <0 50 4716 2661 0221100 1900 50 18 100 60 055 -050 <0 50 <0 50 10 450 88 95 <0 50 4581 2516 slight odor!no sheen 05/18/00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 no no 4089 2024 slight odor!no sheen 0926!00 680 1 t <0 50 31 067 <5 0 no no no no no no no na 4895 2830 slight odor!no sheen 1221/00 1400 16 1 1 40 120 <5 0 no no no no na no no no 4762 -2697 slight odor!no sheen 0327101 1700 61 14 23 220 <5 0 no no no no no no no no 4637 2572 slight odor 1 no sheen 0626/01 390 51 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <5 0 68 <0 50 4899 2834 slight odor 1 no sheen 09105/01 410 1 1 <0 50 <0 50 46 <50 no no no no no no no no 54 11 3346 no odor!no sheen 11!30101 750 72 14 31 15 <5 0 no no no no no no no na 5411 3346 no odor 1 no sheen 0227102 850 12 35 14 23 <50 no no no no na no no no 5078 3013 no odor 1 no sheen MW 10 12/02198 ns ns as ns ns ns ns as as ns as ns ns ns 2087 wellhead survey screened 12130198 180 <0 50 <0 50 <0 50 <0 50 <50 no na na no no no no no 45 B4 -2497 no odor 1 no sheen interval 0326194 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <50 no na 4165 -2078 no odor/no sheen 41 66 06!02199 160 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 94 <0 50 4096 -2009 no odor/no sheen 08/31199 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 4574 2487 no comment 12!091'99 56 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <O 50 <0 50 <5 0 <50 <5 0 26 <0 50 4746 2659 no comment 0221100 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 4591 2504 no odor 1 no sheen 05/16/00 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no 41 11 2024 no odor/no sheen 0926100 ns ns ns as ns as ns as as ns as ns ns ns nm nm well access blocked 1120100 <50 <0 50 70 <0 50 <0 50 <5 0 no no no no no no no no 4789 2702 no odor!no sheen 0327101 <50 <0 50 <0 50 <0 50 4050 <5 0 no no no no no no na no 4762 -2675 no odor f no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <O 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4905 2818 no odor 1 no sheen 09/05/01 <50 <0 50 14 <0 50 '4050 <5 0 no no na na na no no no 5405 3318 no odor 1 no sheen 11130/01 <50 <0 50 <0 50 <0 50 '4050 <5 0 no no na no no no no no 5437 3350 no odor 1 no sheen 0226/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no no no no 5101 3014 no odor 1 no sheen MW-11 1020100 240 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 14 <50 130 23 <0 50 4925 2057 2868 wellhead survey screened 12121/00 300 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no na 4759 2702 no odor 1 no sheen interval 0327101 190 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4631 -2574 no odor!no sheen 30'W 0626101 160 4050 <0 50 <0 50 1 5 <0 5o <0 So <0 50 <0 50 12 <50 17 16 <0 50 4082 2825 no odor 1 no sheen 09105101 ns ns ns ns ns as ns ns ns as ns ns as ns nm nc well dry 11/30101 ns ns ns ns ns as as ns ns as ns ns ns ns dry nm dry 0226/02 ns ns as ns ns ns ns ns ns as ns ns ns ns dry nm dry 412 4 5 HORIZON retad7 14141Page 5 of 7 HORN 9MRONMENTAL INC