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Abdullah Javed <br /> December 3, 2019 <br /> Page 3 of 6 <br /> Guidelines for Substitute Supply Plans for Sand and Gravel Pits, subtracting the pro-rata <br /> amount of the effective precipitation for that period. <br /> You have provided a monthly breakdown of the depletions under this SWSP on the <br /> attached Table 2, which includes 15.53 acre-feet of net evaporative loss, 8.86 acre-feet of <br /> water lost in product (based on an estimated 600,000 tons of washed aggregate and <br /> 150,000 tons of unwashed aggregate), and 24.0 acre-feet for on-site dust control, for a <br /> total consumptive use of 48.38 acre-feet. <br /> The IDS Alluvial Water Accounting System ("AWAS") stream depletion model was used to <br /> determine the lagged depletions from dewatering, evaporation and operational losses to <br /> the Arkansas River. The aquifer characteristics used in the model are: transmissivity (T) _ <br /> 55,000 gallons per day per foot and specific yield (SY) = 0.2, the distance of the exposed <br /> ground water to the stream = 1,400 feet (measured from the centroid of the exposed <br /> ground water surface), and the location of the parallel impermeable boundary was <br /> 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. As shown on Table 3, attached, the total consumptive use <br /> was calculated to be 48.39 acre-feet and lagged stream depletions were calculated to <br /> total 41.54 acre-feet during this SWSP period. <br /> SITE DEWATERING <br /> The Applicant began dewatering the Parkdale Pit in 2012 to assist in the mining of <br /> material below the groundwater table. The water is removed from the ground and placed <br /> into a series of dewatering trenches. This water will be eventually piped and then <br /> discharged on the north side of the property boundary into Currant Creek which is a <br /> tributary to the Arkansas River. All water pumped from the pit reaches Arkansas River <br /> within the same month it is pumped. The Applicant will monitor the dewatering <br /> operations and include the data in their monthly accounting submittals to the State <br /> Engineer's Office. <br /> REPLACEMENTS <br /> The proposed sources of replacement water for this pit include a five-year lease of 50 <br /> acre-feet per year of fully consumable water from the Board of Water Works of Pueblo <br /> ("PBWW"), valid April 1, 2016 through March 31, 2021 (attached), and the applicant's <br /> ownership of 5 shares of Twin Lakes Reservoir and Canal Company stock, which yield <br /> approximately 3.5 acre-feet/year of water. The PBWW water will be provided at the City <br /> of Pueblo wastewater treatment plant located east of Pueblo when adequate exchange <br /> potential exists to make that replacement water available at the Parkdale Project site. <br /> When there is insufficient exchange potential to utilize reusable effluent, the PBWW will <br /> release water from upstream storage at Twin Lakes Reservoir. Upstream reservoir releases <br /> will be subject to a 0.07 percent per mile river transit loss, which equates to <br /> approximately 6.55 percent from Twin Lakes to Parkdale. <br /> Front Range Aggregates has an additional backup supply for this project from a 50 <br /> acre-foot lease with Canon City Water Department, which will only be used in the event <br />