9/11/2003 BOARD OF HEALTH Minutes

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t f monitoring points installed there on the southern and eastern boundaries of the depression there. The pend level actually fluctuates quite a bit over the years, Four of the 7.5 acres are known to be fairly heavily contaminated,, They have it under a rapid response action that is planning to address that soil. They will be digging up 15,000 cubic yards of material of that four acres. They have a low temperature thermal absorption unit going through the permitting stage right now that will be used to treat that soil. Mr. Darrington asked if that was going to happen just around the source area. I ra Hill confirmed that that was correct. He suspected that that would substantially eliminate the source of that groundwater plume and the groundwater actions going on simultaneously or soon afterwards the plume will begin to shrink. The other areas that they were working on were the southeast ranges also know as the II J Ranges", The primary activity over the years has been munitions testing by various private contractors who were under contract to the military testing weapons, Those areas were pointed out on the map. He noted that they would also not some groundwater impact associated with that activity. They had some other rapid response actions currently beim scoped to address areas of known contamination at the J Ranges primarily the J3 range. The bulk of this contaminant is corning down and flowing to snake Pond and possibly discharging into make Pond as well, They had not detected it in the pond water. There is a demolition area on the J3 Range, which was the primary source of the groundwater contamination and the rapid response action is being developed at this time to cleanup that area. There was about 1,000 cubic yards. That will also be seat to the soil absorption unit. The J2 Range they've just recently found a relatively high detection of explosive nitro-chloride, He pointed out the area and noted that it was also in the ,J7 Range there was a 1,000-meter berm here with underground contamination in the soil. Another primary focus area for there was the central impact area, which was the pink and orange blob that they could see up in the center there. The boundaries of the impact area, which all of the munitions were fired into, where the targets were located. They were finding widely distributed fairly dilute plume of f D and percloride also in that area. They were looking at some soil cleanups around a couple of those targets at this point. It was a fairly extensive area that was Identified, as the bulk soil contamination was approximately 14 acres. There have been a number of targets in that next that they have started to cleanup. There are ongoing investigations in the northwest corner near the canal. They have monitoring wells they have installed have detected chloride in that area, so that area under additional Investigation, As well as the western boundary where the town