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Jeffrey A. Clark <br /> January 13, 2021 <br /> Page 3 of 6 <br /> 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 <br /> feet (measured from the centroid of the exposed ground water surface), and the location of the <br /> parallel impermeable boundary was estimated to be 2,650 feet from the stream. <br /> SITE DEWATERING <br /> The Applicant began dewatering the Parkdale Pit in 2012 to assist in the mining of material below <br /> 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 the Arkansas River within the same month it is pumped. The Applicant <br /> will monitor the dewatering operations and include the data in their monthly accounting submittals <br /> to the State Engineer's Office. <br /> REPLACEMENTS <br /> The proposed sources of replacement water for this pit include a three-year lease of up to 50 <br /> acre-feet per year of fully consumable water from the Board of Water Works of Pueblo ("PBWW"), <br /> valid April 1, 2021 through March 31, 2024 (attached), and the applicant's ownership of 5 shares of <br /> Twin Lakes Reservoir and Canal Company stock, which are estimated to yield approximately 5.0 <br /> acre-feet/year of credit in Twin Lakes Reservoir. The PBWW water will be provided at the City of <br /> Pueblo wastewater treatment plant located east of Pueblo when adequate exchange potential <br /> exists to make that replacement water available at the Parkdale Project site. When there is <br /> insufficient exchange potential to utilize reusable effluent, the PBWW will release water from <br /> upstream storage at Twin Lakes Reservoir. Upstream reservoir releases will be subject to a 0.07 <br /> percent per mile river transit loss, which equates to approximately 6.55 percent from Twin Lakes to <br /> Parkdale. <br /> Martin Marietta Materials has an additional backup supply for this project from a 50 acre-foot lease <br /> with Canon City Water Department, which will only be used in the event that the other sources <br /> become inadequate. The Canon City lease, a copy of which was provided to this office on <br /> September 12, 2008, is valid until January 2035. <br /> CONDITIONS OF APPROVAL <br /> I hereby approve the proposed SWSP in accordance with §37-90-137(11), C.R.S., subject to the <br /> following conditions: <br /> 1. This SWSP shall be valid for the period of October 1, 2021 through September 30, 2022, <br /> unless otherwise revoked or superseded by decree. If this plan will not be made absolute by <br /> a water court action by the plan's expiration date, a renewal request must be submitted to <br /> this office and the Division 2 Office (please copy Bethany Arnold at <br /> Bethany.Arnold Pstate.co.us) with the statutory fee by August 1, 2022. If a renewal request <br /> is received after the expiration date of this plan, it may be considered a request for a new <br /> SWSP, in which case a $1,593 filing fee will apply. <br /> 2. Well permit no. 78822-F was obtained for the current use and exposed pond surface area of <br />