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d2 CAD Consulting,LLC <br /> CCWRE <br /> done by hydraulic excavators and front—end loaders, and progresses in a general east to west direction. <br /> It is expected that this method will continue until the deposit is exhausted, possibly in about five years <br /> depending on market conditions. The ultimate size of Cell 4 when mined out will be approximately 33.2 <br /> acres. <br /> Wetland areas requiring mitigation were present in portions of Cells 3 and 4. The wetland mitigation <br /> occurred under the auspices of individual US Army Corps of Engineers (USACE) Section 404 Permit No. <br /> USACE IP#200180205. The USACE in a letter dated August 27, 2008,considered the wetland mitigation <br /> complete. A copy of the permit and associated correspondence and reports are attached. <br /> Discharges are directed to the Big Thompson River via settling ponds as allowed by Colorado Discharge <br /> Permit System No.501572,a copy of which is attached. <br /> RULE 6.4.4 (B) — EARTHMOVING <br /> Prior to stripping operations, earthmoving began with removing a small amount of agricultural <br /> vegetation which was saved with the topsoil and stored in stockpiles for use as mulch during final <br /> reclamation. Part of the stockpiled topsoil was used to construct visual screening berms around the <br /> perimeter of the plant area. The berms were revegetated. Overburden stripped from the area to be <br /> mined was placed on other areas being concurrently reclaimed. <br /> RULE 6.4.4 (C) - ALL WATER DIVERSIONS AND IMPOUNDMENTS <br /> The mine has four cells,three of which are water-filled,as shown on Exhibit C-3. Aggregate processing <br /> and concrete mix waters are separate from the dewatering and stormwater systems. Cell 1 continues to <br /> be used as a fresh water supply pond for aggregate processing and concrete batching water. Cell 2 <br /> receives aggregate wash water and some cured returned concrete. Silt and fines from the processing <br /> and cured returned concrete will continue to be placed in Cell 2. Cell 3 will continue as natural pasture <br /> and a wildlife pond. <br /> Water surface elevations in Cells 1-3 the will be maintained below existing grades, so that any surface <br /> water runoff will be retained. Some de-watering discharges may be diverted back to the process water <br /> system by way of Cell 1. <br /> Grading and shallow ditches on-site direct stormwater from all areas of surface disturbance into the <br /> mine property dewatering systems. In Cells 1 and 2, after the water is clarified and the sediments <br /> collected, process water may be discharged into an on-site ditch along the northern boundary and flow <br /> to the Big Thompson River. <br /> A Colorado Discharge Permit System (CDPS) permit was obtained for the discharge water associated <br /> with dewatering operations. A copy of the permit is attached. Irrigation tailwater ditches along the <br /> eastern property line were relocated to direct flows to the river. <br /> Augmentation plans are discussed in detail in Exhibit G. Municipal water from the Little Thompson <br /> Water District is used for drinking water; groundwater water exposed by mining may be used for <br /> concrete batch operations. <br /> APPLICATION FOR AMENDMENT TO LOVELAND READY MIX CONCRETE,INC <br /> REGULAR 112 PERMIT NO.M-2001-022 GREEN/CROISSANT SAND AND GRAVEL MINE <br /> August,2016 7 OF 39 <br />