2004-12-17_REVISION - M1977208 - Laserfiche WebLink

Home Browse Search

To clear up this discrepancy, the Division will accept that C-Pit will pumped to within approximately 4 feet of the base of the pit in the vicinity the pump, and that adjustments may or 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 standazds, 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 are indeed met at that time, no treatment will he 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 rainlsnow applied to newly generated CKD will cause the pit water to again degrade. 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 aheady is high. The Division is least in favor of chemical additives that could elevate the concentrations of sodium and chloride, as these aze 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 standazds 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 4, rather than pH 8, which would conserve costs. 5. It is not clear 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. Please be advised that _Divi_sion's decision due date is_set for December 31, 2004. If you feel more time is needed to complete your reply, the Division can grant an extension to the decision date. This will be done upon receipt of a written waiver of your right to a decision by December 31, 2004 and request for additional time. This must be received no later than the deadline date. If you have any questions, please contact me at (303) 866-4443. Si ere y; ~~ ~~ Erica 5. Crosby Environmental Protection Enclosure cc: Carl Mount; DMG Harry Posey; DMG Kate Pickford; DMG John I,ohr; CEMEX, Inc.