2017-08-14_REVISION - M2002020

• Permit No: M2002020
• IBM Index Class Name: REVISION
• Doc Date: 8/14/2017
• Doc Name: Request for Technical Revision
• From: City of Greeley
• To: DRMS
• Type & Sequence: TR1
• Email Name: PSH
• Email Name: WHE
• Media Type: D
• Archive: No

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Cit\ of
Greeley
August 11, 2017
Mr. Peter Hays
Environmental Protection Specialist II
Colorado Division of Reclamation Mining and Safety
1313 Sherman St., Room 215, Denver, CO 80203
Dear Mr. Hays:
Subject: Technical Revision to the 25' Ave. Site's Permit# M-2002-020 to Allow for
Construction of Erosion Protection Measures
The City of Greeley is requesting a technical revision to revise the 25"' Avenue Site Regular 112
Operation Reclamation Permit Number M-2002-020 Reclamation Plan to address proposed
construction of erosion protection measures at the partially reclaimed northwest-most mining
cell, also known as the Poudre Ponds Water Storage Facility and Recreational Fishery (Poudre
Ponds).
The erosion protection measures are necessary to protect the Poudre River Trail (a City of
Greeley recreational trail between the Cache la Poudre River and Poudre Ponds) and the Poudre
Ponds during flood stage flow on the Cache la Poudre River. The project will entail constriction
of a concrete inflow point in the shape of a trapezoidal spillway to allow flood stage flow from
the Cache la Poudre River into the pool storage of the Poudre Ponds cell. With subsequent
receding of flood stage flow in the river, any water captured in excess of the facility's water
rights will be returned to the Cache la Poudre River via an existing pump station in Poudre
Ponds.
Project: Purpose and Need
Past high-flow events on the Cache la Poudre River (most recently in 2013 and 2014) have
caused overflow from the river into Poudre Ponds causing erosion on the north bank of the
facility and associated erosion damage to that facility. An existing low point on the north bank
has been identified as a location where overflow during times of high flow is likely. This project
will implement erosion protection measures to reduce or.eliminate erosion at that location to
protect the existing facility; to preserve historic floodplain flow paths by preventing erosion
leading to river capture; and to protect the existing Poudre River Regional Trail, which is located
on the crest of the Poudre Ponds' north embankment.
Water and Sewer Department . 1100 loth Street,Suite 300,Greeley,CO 80631 . [phone] Fax[phone]
A City Achieving Community Excellence