20030179 Ver 6_Public Hearing Info_20070825

Dillsboro Dam &
Powerhouse
Removal
September 25, 2007

Background
• Component of the Nantahala and
Tuckasegee Cooperative Stakeholder
Team Settlement Agreements
• 2004: Duke submitted license surrender
application
• 2005: DWQ Issued 401
• July, 2007: FERC approved
• August, 2007: Duke requested FERC
clarification
Reasons for Removal
• Mitigates for impacts of other Duke NA
hydroelectric projects
• Enhances aquatic habitat for fish and
mussels (opens 10 additional miles of
river)
• Allows aquatic species &
boaters to move freely up an
down the river
• Preserves more green
hydroelectric generation ~"
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Dillsboro Project Facilities
• Dam
-Height: 12 ft
-Length: 230 ft
-Material: Concrete masonry
• Powerhouse
-Steel & wood superstructure
-Concrete substructure
Dam & Powerhouse Removal
Process
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NCDWQ Activities Associated with
Dam & Powerhouse Removal
• Installation of temporary work pad
-404/401 required
• Construction of an access road
-404/401 required
• Detailed Demolition & Monitoring Plan
-Condition of 2005 401
NCDWQ Activities Associated with
Dam & Powerhouse Removal
• Management of Reservoir Sediments
-Option: Use flushing flows
• Proposed in license surrender application
• Supported by sediment transport study
-Option: Sand Mining
• Requires 404/401, sand mining permit, &
discharge permit
• Contingent upon volume and market for sand
Other Associated Activities
• Relocation of mussels
- FERC approval of plan required
• Relocation of bats
- FERC approval of plan required
• Revegetation of shoreline
- Requires FERC approval of plan
• Cultural Resources Agreement
- Plan already approved by FERC
• Miscellaneous other plans
- Require FERC approval
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