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17 December 1998 <br /> Page 2, <br /> the property and found high levels of EDB in a pa- <br /> rticular well <br /> as high a s to <br /> ppb. There are lower concentrations in here but they go from <br /> grouted surface <br /> ald the way down in depth to about loo feet. The reason for <br /> the driffing was <br /> to confirm that the upwelhng is occurring along the fringes of the <br /> bog and to <br /> show the highest levels of contamination. The found in their� � ear drillin , some <br /> silt lenses that are affecting how the water moves in this <br /> particular area. <br /> They wanted.to see if there is any peat in this particular area and did not <br /> d any. He pointed to two other areas where significant t deposits were <br /> found, Below the peat, they did not find EDB. They have <br /> confirmed with <br /> their monitoring wells that it is all upwelhng at the edges of <br /> t e bog itself. <br /> There stillay be someEDB underneath the bogs so the have" , mel some <br /> new wells, identified very high levels of concentrations andonf'�i.rmedthei` <br /> r <br /> site conception model that generally all the plume is starting to u well in <br /> this particular area. The majority of it wants to core out on <br /> the fringes of <br /> the peat bog itself. <br /> The second thing they have done i ground watermodeling. <br /> � They modeled <br /> three different pumping rates. In their modeling, they looked at <br /> 200 gaIlons <br /> per mmute, 400 gallons per minute and boo gallons per minute. They want <br /> to pull the plume down and try to out it ofd' at this particular area. At 200 <br /> gallons per minute, they can be very effective if they �rem ect water e at the top <br /> which causes the ground water table to mound. Treated water would o ld then <br /> come into the K1 bog and force the plume down to be captured b the <br /> � <br /> well. What that leaves is a piece of plume that is stip u ween <br /> p g or coning <br /> into the bog here (pointing). The next step they modeled was using ng an <br /> interceptor pipe with shallow well points that would to Feet below theound <br /> surf � <br /> ace to try to intercept the remaining part o the plume. They would have <br /> to heat about 400 gallons per minute. The combined system that they are <br /> proposing is to build a carbon activated treatment system here that would <br /> have the dimensions of about 25 x. o, two canisters roughly 20,000 <br /> lbs. of <br /> activated carbon per cell inside the building and then they would treat *a <br /> ter <br /> at Zoo gallons per minute from this extraction well and then 400 gallons <br /> per <br /> minute <br /> from these weft points. <br /> Mr. Wi sen asked if they were verti <br />