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' COLORADO <br /> + Division of Water Resources <br /> 1313 Sherman Street, Room 821 <br /> Denser, CO 80203 <br /> Response to Reclamation Permit Amendment Application Consideration <br /> DATE: January 13, 2016 <br /> TO: Tyler V. O'Donnell, Environmental Protection Specialist <br /> CC: Division 1 Office, District 2 Water Commissioner <br /> FROM: loana Comaniciu, P.E. <br /> RE: Hazeltine Mine, File No. M-2004-031 <br /> Operator: Aggregate Industries-WCR, Inc. <br /> Contact: Connie N. Davis, (970) 396-5252 <br /> Section 9, Twp 2 South, Rng 67 West, 6th P.M., Adams County <br /> COMMENTS: Aggregate Industries-WCR, Inc. requested an amendment (AM01) to the application for <br /> Hazeltine Mine, Permit no. M2004-031. The purpose of this amendment is to incorporate a permanent <br /> ground water mounding mitigation plan into the final reclamation of the site. A soil-bentonite slurry <br /> wall keyed into the bedrock was constructed around the perimeter of the Hazeltine Mine. The <br /> installation of the slurry wall caused ground water mounding into an adjacent property, known as Orr <br /> property. The operator is proposing to construct a permanent drain to reduce ground water levels <br /> from Orr property into the Hazeltine Mine Pit. The propose system will be a gravity system where <br /> partial flows from the Bull Seep and groundwater seepage will be diverted through the mine and <br /> from there conveyed back to Bull Seep and the South Platte River. <br /> The final use of the Hazeltine Mine is a water storage reservoir owned and operated by the City of <br /> Thornton. According to our records a 90-day leak test for this reservoir started on December 9, 2015. <br /> This office has no objection to the amendment request, provided all inflows and outflows of the <br /> water through the reservoir from the drain system are properly accounted for. All water pumped <br /> from the drain shall not be used for any beneficial purposes and must be discharge to the stream <br /> system without consumptive use. Water shall not be impounded in the reservoir except pursuant to <br /> lawful diversions allowed by statute or decree. At all other times, all inflow of water into the reservoir <br /> from any source, including precipitation, ground water inflows and drain water shall be removed to <br /> prevent illegal storage of water. The owner or operator will need to coordinate with Brent Schantz, <br /> River Operations Coordinator, to review operations, measurement structures, and accounting. <br /> The applicant may contact the State Engineer's Office with any questions. <br /> `Y <br /> Y. <br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866 3581 F 303 866.3535 v,ww.water state.co.us <br />