gold ray dam interagency technical team meeting. nepa update deconstruction plans hydraulic modeling...
TRANSCRIPT
Gold Ray Dam Interagency Technical Team Meeting
NEPA UpdateDeconstruction PlansHydraulic ModelingNext Steps
Agenda
Upstream habitat (wetlands, fish, frogs, riparian areas)
Well levels Downstream domestic water intakes Sediment quality Recreation Economic impacts (fishing and river guides) Alternatives – dam rehab and power
generation
NEPA Update
EA Issues from Scoping Mtg
Section 1 – Introduction Section 2 – Purpose and Need and Alternatives
Purpose and need – complete No action Alternative 1 – Dam Removal
• Deconstruction plan• Restoration plan
Alternative 2 – Dam Rehabilitation• Dam, forebay walls, etc. (structural)• Fish Ladder• Fish Screening• Power generation – optional?
NEPA Update
EA Progress
Section 3 – Affected Environment and Environmental Consequences
Section 4 - Preparers and Agencies Consulted Section 5 – Abbreviations/Acronyms Section 6 – References
NEPA Update
EA Progress
Dam complex SHPO coordinationDetermination of eligibility (DOE) nearly complete Likely eligible for National RegisterRemoval likely “adverse effect” but mitigated
Archaeology SHPO coordination doneDOE underway – no shovel testing required
NEPA Update
Cultural Resources
“Level 1” – based on records and site visit; no testing
Look for indicators for contamination Recommend testing locations in power
house and former transformer sites
NEPA Update
Environmental Site Assessment
Biological Assessment Content largely completed Confirm the action area Incorporate demo/restoration plan
information
Project Approach
Wetlands Report Submitting 2 wetland reports: Delineation
Report and Indirect Wetland Impact Report
Reports are drafted; waiting for 2 year event modeling to finalize maps
Project Approach
Schedule Review draft EA and permit applications in
middle of January Draft EA – 30 day review and revision Goals:
Submit BA and permit applications in early February
EA out for public review in mid to late February
Project Approach
Deconstruction Plan Multi-step plan with controlled
drawdown of reservoir Minimizes risk for County Ensures dam removal and fish
passage when complete
Project Approach
1934 Log Crib Dam (PacifiCorp)
1940 Log CribDam (PacifiCorp)
1941 Gold Ray Dam Construction (PacifiCorp)
1941 Gold Ray Dam Construction (PacifiCorp)
November 14, 1941 (PacifiCorp)
Project Approach
Project Approach
Fish Passage Plan
Fish Passage Plan
Project Approach
Project Approach
DATE
5/24
/10
5/31
/10
6/7/
106/
14/1
06/
21/1
06/
28/1
07/
5/10
7/12
/10
7/19
/10
7/26
/10
8/2/
108/
9/10
8/16
/10
8/23
/10
8/30
/10
9/6/
109/
13/1
09/
20/1
09/
27/1
010
/4/1
010
/11/
10
CONSTRUCTION (June 15 - August 31 in-water)Access site on south side / mobilize equipment
Construct south side cofferdamRemove southern portion of concrete dam
Divert river to south channel opened by dam removal (fish passage delay)Construct north side cofferdam
Remove northern portion of concrete damRestore river to permanent channel
Construct restoration portions of project (Kelly Slough/Tolo Slough/Bear Creek)Remove existing powerhouse and fish ladders
Deconstruction Schedule
Restoration PlanProject Approach
Hydraulic Modeling
Next Steps Finalize deconstruction plan Run hydraulic modeling DRAFT NEPA Continue with public outreach
Summary