Duncan Creek Crossing Replacement and Sediment Removal

Summary

SCH Number
2006048135
Lead Agency
Placer County Water Agency
Document Title
Duncan Creek Crossing Replacement and Sediment Removal
Document Type
NOE - Notice of Exemption
Received
Posted
4/11/2006

Document Description
The project consists of replacement of the structural plate culvert crossing Duncan Creek upstream of Duncan Diversion Dam, which was destroyed by storm flows and debris during the storm of December 31, 2005 to January 1, 2006. Embankment material surrounding the culvert was washed away, a portion of which was deposited at the upstream end of the Duncan Diversion pool. Engineering and design of a replacement crossing is planned for 2006, and construction is planned for summer/fall 2006 or 2007, after necessary permits are obtained. The replacement crossing will be designed to better handle large debris, which may be more likely since the Star Fire of 2001. Embankment material for the crossing abutments will be obtained at least partially from the sediment at the upstream end of the diversion pool, which can be excavated without unwatering the pool. No uncured concrete will be allowed to contact surface waters. A stream flow bypass system may be required during construction of the crossing. The work will be performed under a California Department of Fish and Game 1601 Agreement, a US Army Corps Nationwide permit, a #401 Water Quality Certification, a Tahoe National Forest Special Use Permit, which include requirements for environmental protection, and authorization to proceed from FERC prior to construction.

Contact Information
Jon Mattson
Placer County Water Agency
P.O. Box 667
Foresthill, CA 95631

Phone : (530) 885-6917

Location

Counties
Placer
Other Location Info
City: Foresthill

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301(b)
Reasons for Exemption
The project consists of the repair and maintenance of existing public structures, and involves no expansion of use beyond that previously existing. The structures belong to a publicly-owned utility, and are used to support electric power generation and water supply.
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