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TABLE 1 Groundwater Monitoring Data Former Beacon Station No 12419 2350 Waterloo Road,Stockton,Cal tfornia ethyl Depth to TOC GW Well TPHg benzen toluene benzen xylenes MTBE DIPE ETBE TAME TBA methano ethanol EDC EDl3 GW Elevation Elevation Number Date I (ug1L) (ugll) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) 1ug1L) (ug&) (ug1L) (ugfl (ug1L) (ug1L) (feet) (feet sea level)(feel sea level) Comments MW 9 11/12198 2065 wellhead survey screened 12/30/98 1500 73 18 160 64 <25 0 na na na na na na na na 4559 2494 slight odor!no sheen interval 0326199 1300 54 58 110 15 <0 50 <0 50 <4 50 <0 50 11 <5D <50 na na 4139 2074 no odor!no sheen 41 66 06102199 1300 16 25 76 24 <D 50 <0 50 <D 5D <D 50 13 <50 <50 16 <0 50 4074 2009 no odor 1 no sheen OUM1199 2400 140 21 460 280 055 <0 50 <0 50 <0 50 93 <50 -50 42 <0 50 4562 2497 no comment 12109/99 1600 86 65 200 62 079 -050 -050 <0 50 10 <50 <50 13 <0 50 4726 2661 0221100 19M 50 18 100 60 o55 <0 50 <0 50 <0 50 10 <50 80 95 <0 50 4581 2516 slight odor 1 no sheen 05/18/00 790 96 Dal 76 21 <0 50 <0 50 <0 50 -050 12 <50 <50 na na 4089 2024 slight odor 1 no sheen 09(26100 680 1 1 <0 50 31 087 <50 na na no na na na na na 4895 2830 slight odor I no sheen 12121!00 1400 16 1 1 40 120 <50 as na no na na na na na 4762 2697 slight odor 1 no sheen 0327101 1700 61 14 23 220 <50 na na na na na na na na 4637 2572 slight odor I no sheen 0626101 390 51 065 44 27 <D 50 <0 50 -050 4 50 B 5 <50 <50 68 <0 50 4899 2834 slight odor I no sheen MW 10 12102198 2057 wellhead survey screened 12!30198 180 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4504 2497 no odor 1 no sheen interval 0326199 140 064 <0 50 <0 50 072 <D 50 <0 50 <0 50 <0 50 92 <50 <50 na na 4165 2078 no odor I no sheen 41 66 06402199 160 -050 <0 50 <0 50 <D 50 <0 50 <0 50 -050 <0 50 12 <50 .5G 94 <0 50 4096 2009 no odor 1 no sheen 08131/99 120 -050 <D 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <5a 65 <0 50 4574 2487 no comment 12109/99 56 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 26 -050 4746 2659 no comment 0221100 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 -50 33 <0 50 4591 25 04 no oda 1 no sheen 0511!1100 <50 -050 31 -050 <0 50 <0 50 450 -050 4 50 <50 <50 <50 na na 41 11 2024 no odorfio sheen 09/26/00 as ns ns ns ns as ns ns ns ns ns ns ns as nm nm well access blocked 1220/00 <50 -050 70 <0 50 <0 50 <50 na na na na na na na as 4789 2702 no oda 1 no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 -50 na na na na as na na as 4762 2675 no oda 1 no sheen 06/16101 <50 <0 50 <0 50 <0 50 <0 50 4 50 <0 50 <0 50 <0 50 <50 <50 <50 <0 50 <0 50 4905 2818 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 umy screened 1221100 300 <0 50 -050 cD 50 <050 <50 as na na na na na na na 4759 2702 no oda 1 no sheen interval 03!27101 190 <0 50 -050 -050 <0 50 <50 as na na na na na na as 4631 2574 no oda 1 no sheen 0626401 160 <0 50 <0 50 <0 50 15 <0 50 <0 50 <0 50 <0 50 12 <50 17 16 <0 50 4882 2825 no odor/no sheen 30' 50 VW1 03!26199 260000 3000 1800 9100 44000 49 <10 <10 <10 250 1700 220000 na na 4158 ran nm no odorhw sheen screened 06/02/89 84000 2000 56000 5400 26000 55 <10 <10 <10 240 4400 99000 35 790 4092 run slight ododno sheen interval 08(31199 as ns as its ns as ns ns ns ns as ns as ns dry nm dry 34 44 12!09199 as as as ns ns as as ns ns ns ns ns as ns dry nm dry 02/21100 as as as ns ns as as ns r1s ns as ns as ns dry nm dry 05118100 ns ns as as ns as ns ns ns ns ns ns ns ns dry nm dry 0926100 as ns as ns na as as ns ns ns ns ns as as dry nm dry 1221100 ns ns ns ns ns as ns ns ns ns ns ns as ns dry nm dry 0327101 ns ns ns as ns as as ns as ns ns ns as as dry nm dry 06/26/01 ns Its ns ns ns ns ns ns ns ns ns ns as as dry nm dry 4119wniW-Kh Page 5 of 6 HOWZOX ZNVMOXKrIfTAI,INC 141941