2004-12-16_REVISION - M1977208 (2)

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may not be made in the pit or pump or appurtenances to allow pumping to an even greater depth. In the event that water remains in the pit, and that if water quality at that time does not meet applicable standards, the contingency plan will be implemented and the remaining water will be treated. If water remains in the pit after all that can be pumped is pumped, and if water quality standards aze indeed met at that time, no treatment will be expected. If water accumulates in the C-Pit after pumping and treating has removed all of the extant pool, the Division should require periodic sampling of waters that later accumulate in C-Pit and, provided those waters do not meet applicable standards, such water should be treated. At issue is whether further water or rain/snow applied to newly generated CKD will cause the pit water to again degrade. 3. Of the several chemical applications evaluated, the Division prefers, but cannot require, COZ application. This chemical is free of all potential contaminants, is safe to transport and apply, it produces a weak acid, inexpensively, and can be purchased for food grade applications. Moreover, the COZ adds no constituents that would increase the concentration of dissolved solids, which already is high. The Division is least in favor of chemical additives that could elevate the concentrations of sodium and chloride, as these are difficult to remove from natural waters except by evaporation. 4. An issue for the Division to consider is what amount of bond will cover the application. Because surface water standards for pH range from 6.5 to 9.0, any pH in that range must be considered acceptable. Thus, the Division could approve a bond amount for treatment to a pH of 9, rather than pH 8, which would conserve costs. 5. It is not cleaz from the printout how the water balance was used. If this part of the submittal is germane to this TR, it should be explained and its use identified. Cc: Kate Pickford Bruce Humphries 2