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OPEN SPACE & TRAILS DEPARTMENT <br /> SUMMIT COUNTY'! 970,668.4060 ph 1970.668.4225 f 0037 Peak One Dr. I PO Box 5660 <br /> www.SummitCountyCO.gov Frisco.CO 80443 <br /> July 25, 2016 <br /> Mr. Eric Scott <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> RE: REQUEST FOR TECHNICAL REVISION <br /> Mine Name: Swan River Resource <br /> Mine ID# M-1993-035 <br /> Location: Summit County <br /> Dear Mr. Scott, <br /> Please let this letter serve as an application for a Technical Revision (TR) under Rule 1.9.1 from Summit County <br /> Government for a modification to the permitted post-mining reclamation plan for the Swan River Resource <br /> (Regular 112 operation permit no. M-1993-035). Technical Revision 02 (TR02) to the Swan River Resource that <br /> was approved by Eric Scott, Minerals Regulatory Program Environmental Protection Specialist on April 7, 2016 <br /> allows for a final reclamation condition of a naturally restored valley corridor containing a naturalized stream <br /> channel, riparian area, and uplands. This TR request seeks to maintain the approved reclamation plan, but with <br /> some revisions based on unforeseen conditions encountered onsite. <br /> Existing Conditions within the Permit Boundary <br /> Much of the site comprising the Swan River Resource was heavily impacted by dredge boat mining in the early <br /> 1900's, which left the valley bottom virtually devoid of any natural resource function or value. Dredging was <br /> completed to an unknown depth (estimated to at least 30 feet) throughout the Swan River Valley as well as the <br /> nearby Blue River Valley. Dredge spoils remaining within the permit boundary typically consisting of cobble sized <br /> materials left in piles that extend approximately 25 feet above the surrounding valley floor. Historic dredge <br /> mining activities left the Swan River Resource and upper valley generally devoid of natural vegetation and <br /> ecological function as a result of past mining activities. Sporadic pockets of shrubs or young trees may exist near <br /> the existing Swan River channel or where groundwater surfaces. <br /> The Swan River Resource coincides with a portion of the IXL/Royal Tiger Mine and Mill cleanup sites where <br /> remediation activities implemented in 2006 aimed to remediate exposed onsite tailings piles pursuant to the <br /> Colorado Voluntary Clean-up Act and an associated consent decree developed during a land transfer between <br /> the previous mine owners and Summit County. During this Voluntary Cleanup, areas of mine waste were <br /> identified, characterized, and remediated in accordance with the Voluntary Clean-up Plan (VCUP). Tailings piles <br /> identified along the periphery of the stream restoration area were characterized and capped under a two foot <br /> thick vegetated soil cap. Refer to the attached Voluntary Clean-up Plan — IXL/Royal Tiger Mine and Mill Site, <br /> approved October 27, 2004, for a detailed discussion of previous environmental site investigations, analyses, and <br /> remediation activities. <br />