2012-11-07_HYDROLOGY - M1997054 - Laserfiche WebLink

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Stephen Buechner, Applegate Group Page 3 November 7, 2012 SITE DEWATERING Beginning in October 2012, the Applicant will begin to dewater the Parkdale Pit to assist in the mining of material below the groundwater table. The water will be removed from the ground and placed into a series of dewatering trenches. This water will be eventually piped and then discharged into the Arkansas River on the south side of the property boundary. The Applicant will monitor the dewatering operations and include the data in their monthly accounting submittals to the SEO. REPLACEMENTS The proposed sources of replacement water for this pit are an annual lease of 50 acre - feet per year of fully consumable water from the Board of Water Works of Pueblo ("PBWW "), and the applicant's ownership of five shares of Twin Lakes Reservoir and Canal Company stock, yielding approximately 3.5 acre -feet of water. The PBWW water will be provided at the City of Pueblo wastewater treatment plant located east of Pueblo when adequate exchange potential exists to make that replacement water available at the Parkdale Project site. When there is insufficient exchange potential to utilize reusable effluent, the PBWW will release water from upstream storage at Clear Creek Reservoir or Twin Lakes Reservoir, or the applicant may release water from Twin Lakes Reservoir. Upstream reservoir releases will be subject to a 0.07 percent per mile river transit loss, or approximately 6.34 percent from Clear Creek Reservoir to Parkdale, and 6.55 percent from Twin Lakes to Parkdale. Front Range Aggregates also has an additional backup supply for this project from a 50 acre -foot lease with the Canon City Water Department that will only be used in the event that the other sources become inadequate. The Canon City lease, a copy of which was provided to this office on September 12, 2008, is valid until January 2035. The monthly depletions and replacement requirements are provided on the attached Table 3. CONDITIONS OF APPROVAL I hereby approve the proposed substitute water supply plan in accordance with §37 -90- 137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of October 1, 2012 through September 30, 2013, unless otherwise revoked, modified, or superceded by decree. If this plan will not be made absolute by a water court action by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee (currently $257) by August 16, 2013. 2. Well permit no. 67722 -F was obtained for the current use and exposed pond surface area of the gravel pit in accordance with §37 -90- 137(2) and (11), C.R.S. 3. The total surface area of the groundwater exposed at the Parkdale Project site must not exceed 3.0 acres during the approval period of this SWSP resulting in an annual evaporative loss of 8.51 acre -feet. Field visits by the Water Commissioner will be made to confirm that 2.4 acres of evaporative surface area is appropriate for settling ponds and the gravel washing pond under this plan. Should the evaporative surface area exceed