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Stephen Buechner, Applegate Group Page 3 <br /> December 10, 2015 <br /> feet of net evaporative loss, 13.66 acre-feet of water lost in product, and 8.88 acre-feet for on-site <br /> dust control, for a total consumptive use of 33.81 acre-feet as shown on the attached Table 2. The <br /> Applicant anticipates that 540,700 tons of aggregate will be mined at the site during this SWSP <br /> period, of which 387,500 tons will be washed material and 153,200 tons will be unwashed material. <br /> The washed material will be charged a depletion of 4 percent by weight of the material, and the <br /> unwashed material will be charged a depletion of 2 percent by weight of the material. <br /> The IDS Alluvial Water Accounting System ("AWAS") stream depletion model was used to <br /> determine the lagged depletions from dewatering, evaporation and operational tosses to the Arkansas <br /> River. The aquifer characteristics used in the model are: transmissivity (T)= 55,000 gallons per day per <br /> foot and specific yield (SY) =0.2, the distance of the exposed ground water to the stream = 1,400 feet <br /> (measured from the centroid of the exposed ground water surface), and the location of the parallel <br /> impermeable boundary was estimated to be 2,650 feet from the stream. <br /> During this plan approval period, no ground water will be used for reclamation, concrete <br /> batching, or any other purpose. The total consumptive use was calculated to be 33.81 acre-feet <br /> and the total tagged stream depletions were calculated to be 33.28 acre-feet for the 2015-2016 <br /> approval period. <br /> SITE DEWATERING <br /> The Applicant began dewatering the Parkdate Pit in 2012 to assist in the mining of material <br /> below the groundwater table. The water is removed from the ground and placed into a series of <br /> dewatering trenches. This water will be eventually piped and then discharged on the north side of <br /> the property boundary into Currant Creek which is a tributary to the Arkansas River. All water <br /> pumped from the pit reaches Arkansas River within the same month it is pumped. The Applicant wilt <br /> monitor the dewatering operations and include the data in their monthly accounting submittals to <br /> the State Engineer's Office. <br /> REPLACEMENTS <br /> The proposed sources of replacement water for this pit are an annual lease of 50 acre-feet <br /> per year of fully consumable water from the Board of Water Works of Pueblo ("PBWW"), valid <br /> through April 1, 2016, and the applicant's ownership of five shares of Twin Lakes Reservoir and <br /> Canal Company stock, yielding approximately 3.5 acre-feet of water. The Applicant is in the process <br /> of renewing the lease with the PBWW beyond April 1, 2016. A copy of the new lease will be provided <br /> to this office when obtained. The PBWW water wit( be provided at the City of Pueblo wastewater <br /> treatment plant located east of Pueblo when adequate exchange potential exists to make that <br /> replacement water available at the Parkdale Project site. When there is insufficient exchange <br /> potential to utilize reusable effluent, the PBWW will release water from upstream storage at Twin <br /> Lakes Reservoir. Upstream reservoir releases will be subject to a 0.07 percent per mile river transit <br /> loss, which equates to approximately 6.55 percent from Twin Lakes to Parkdale. <br /> Front Range Aggregates has an additional backup supply for this project from a 50 acre-foot <br />