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City of <br /> woe" Thornton <br /> Infrastructure Maintenance Center Infrastructure Department <br /> 12450 Washington Street 720-977-6600 <br /> Thornton,CO 80241-2405 FAX 720-977-6202 <br /> www.cityofthornton.net <br /> February 16, 2016 <br /> Mr. Tyler O'Donnell <br /> Division of Reclamation, Mining, and Safety RECEIVED <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 FEB 16 2016 <br /> Denver, CO 80203 <br /> DIVISION OF RECLAMATION <br /> RE: Hazeltine Mine; Permit No. M-2004-031 MININGAND SAFETY <br /> Dear Mr. O'Donnell: <br /> The purpose of this letter is to provide information regarding existing site conditions at <br /> the Hazeltine Mine as the Division considers a proposed amendment to the above <br /> referenced permit. During the course of researching the proposed amendment to the <br /> permit, the city of Thornton became aware that surface water is being planned to be <br /> drained into the pit on a permanent basis rather than being allowed to flow to the <br /> South Platte River as it historically did prior to development of the Hazeltine Mine <br /> gravel pit and the three gravel pits to the north. The surface water appears to be <br /> coming from what is known as the Bull Seep. The city is not aware of any existing <br /> water right or augmentation plan that would allow the water to be stored in the <br /> reservoir. Attached are two aerial photographs of the Hazeltine Mine vicinity. The first <br /> aerial photograph is from October 9, 2015. The second aerial photograph is from <br /> June 26, 1993. They demonstrate the conditions in regards to the surface water <br /> drainage in the vicinity. <br /> Sincerely, <br /> Ed Lanyon <br /> Water Resources Administrator <br /> EA/dm <br /> cc: MLCR <br /> Mike Refer, Aggregate Industries <br /> 5:11D\wR\elanyon\021618 ORMS East Cooley Comment Letter,docx <br />