SUNSET FISH PASSAGE &

ENERGY PROJECT

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SFPEP

•Activities to date:

•Design Refinements

•Study Updates

•Next Steps

Action Date

Submitted Revised Study Plan December 31, 2013

FERC issued Study Plan Determination January 30, 2014

Update to Board February 4, 2014

Study Period Commences February 2014

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SFPEP: Design Refinements

•District design process continually evaluating alternatives to reduce cost and impacts as new data collected

•Planned design revisions to following areas:

• Intake / Headrace

• Fish Screens

• Power Tunnel

• Powerhouse

• Bridge

• Turbine Selection

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SFPEP: Intake / Headrace - PAD

•PAD design

included 7-ft

weir structure

spanning

channel

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SFPEP: Intake / Headrace

1938 Pool and

Control Point

2006 Pool and

Control Point

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SFPEP: Intake / Headrace - refined

• Per bathymetry, review of historic aerial imagery and refinement of rating curve, no weir is required

• Flow regulation via powerhouse control

• Natural stable control point downstream maintains deep pool, self-cleaning at high flows

• Saves approx $10M construction cost

• Reduces in-water work and timeline

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SFPEP: Intake / Headrace - refined

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SFPEP: Fish Screens - PAD

•PAD design included large cavern

housing vertical fish screens

•Approx 50% of project excavation identified related to cavern & weir

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SFPEP: Fish Screens - refined

• Move to opposite side of hillside

• Reduces 50% of excavation, simpler constructability

• Fish bypass returns juveniles directly to bypass reach

• Long-term improved access and O&M

• Reduces overall project cost

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SFPEP: Power Tunnel - PAD

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SFPEP: Power Tunnel - refined

• Allows flexibility to construction sequencing, should reduce duration and disperse traffic due to multiple entrance sites

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SFPEP: Powerhouse - PAD

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SFPEP: Powerhouse - refined

• Moving closer to river reduces overall cost, powerhouse height, tailrace length, and removes need to excavate entire rock knob

• Relocation of switchyard reduces rock excavation

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Turbine Selection

• Kaplan or Francis fits head/flow

• Kaplan improves overall energy production, improved overall economics

• Still evaluating unit size and single vs. double

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SFPEP: Study Revisions - HDR

• SP 1, Water Quality: Revisions to study plan including

increased monitoring (additional locations, additional

parameters), $42,057

• SP 17, Mollusks: New study requirement, $36,975

• SP 18, Benthic Macroinvertebrates: Revisions to study

plan, $2,047

• Additional contract cost: $81,079

• New total contract cost: $311,242

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SFPEP: Study Revisions - Anchor • SP 12, Downstream Fish Passage at Falls (Injury

Assessment): Revisions to study plan including more

tests with larger fish

• Additional contract cost: $85,170

• New total contract cost: $302,646

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SFPEP: Study Revisions - ERM

• SP 9, Aesthetic Resource Study: Additions to study plan

as required by the FERC Study Plan Determination, to

include low, medium and high flows for 6 Visual Key

Observation Points (VKOPs), include landscape views

(mountains) at 4 KOPs, and include photomontages for

temporary construction impacts. New Project design

requires new photomontages of intake, powerhouse, and

fish screens.

• Additional contract cost: $77,458

• New total contract cost: $276,058

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SFPEP: Next Steps

• Amend 3 Contracts: additional $243,707

• Complete all field work for 16 required Study Plans and

geotechnical work, and deliver draft reports by year end

• Discuss design revisions with stakeholders – further

refinement may occur

• Announce revisions in project design to FERC service list

• Update to media

• Continue with design development

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QUESTIONS

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