HomeMy WebLinkAbout2007-12-13 Council Packet - Work Session
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KENA~ SI(A
ME ND
TO: Mayor/Council
FRO1VIa Carol L. Freas, City erk
DATE: December 4, 2007
RE: SCHEDULING OF WORK SESSION --Bluff Erosion Project
City Manager Koch has requested a work session be held to hear a status report of
and discuss the bluff erosion project with representatives of the Corps of Engineers.
The work session would be held on Thursday, December 13, 2007, beginning at 6:30
p.m. in the Kenai City Council Chambers.
Does council agree to schedule a work session for Thursday, December 13,
2007 at 6x30 p. m. for the purpose of hearing a status report of and discussing
the bluff erosion project with representatives of the Corps of Engineers?
DEPARTMENT OF THE ARMY
U.S. ARMY ENGINEER DISTRICT, ALASKA
P.O. 60X 6898
ELMENDORF AFB, ALASKA 99506.0898
Project Formulation Section
30 November 2007
The City of Kenai, working with the engineering consultant PN&D developed preliminary plans
to provide bank stabilization along the bluff at the lower reach of the Kenai River. A design
concept report was completed in January 2000. Several resource agencies reviewed these design
plans in the report, provided concerns and comments on the plans, and requested additional
information to fully evaluate the impacts of the project.
Technical studies were completed by the U.S. Army Corps of Engineers and Alaska Department
of Fish and Game to evaluate the mechanisms} contributing to the bluff erosion and to
determine potential effects of bluff stabilization. These studies address many of the agency
concems and requests for additional information. A summary of the agency concerns and Corps
responses are enclosed. The technical studies are presented in the Corps' Kenai River Technical
Report, May 2006. The report can be found on the Internet at
http a/www.poa.usaee.armv.mi]/en/cw/reports.htm
The Corps is presently conducting field investigations, technical analyses, and designs of bank
stabilizatian alternatives. These alternatives include consideration of factors such as
environmental impacts, real estate acquisition, cost, constructability, and reliability.
It is requested. that you review the May 2006 report and enclosed summary of agency comments.
We would like to meet with you to discuss our report findings, present the current design
alternatives, and discuss any concerns or comments you may have on the project. A meeting is
schedule for December 13, 2007 from 1:00 to 4:00 pm and will be held at the Cook Inlet
Aquaculture Association office at 40610 Kalifornsky Road in Kenai.
I look forward to meeting with you and discussing this project. Please contact me at 907-753-
5638 if you need additional information. --
Patrick Fitzgerald, P.E.
Project Formulation Section
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Bank stabilization project area
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Kenai River at Kenai
Bank Stabilization Project
Cook Inlet Aquaculture
Association
December 13, 2007
1:00 to 4:00 pm
Dr
Kr.~a#. Spur dewy
Cook Inlet Aquaculture Association
40610 Kalifornsky Road
907-283-5761
Two blocks east of Bridge Access Road 1
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PUBLlC NOTICE
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CfM ~ SNC
The Kenai City Council will meet in a work session on Thursday,
December 13, 2007 with representatives of the Corps of Engineers for
the purpose of hearing a status report and discussing of the City's
bluff erosion project. The work session will be held in the Kenai City
Council Chambers located at 210 Fidalgo Avenue, Kenai, beginning of
6:30 p.m.
The work session is open to the public. Contact the Kenai City
Clerk's office at 210 Fidalgo Avenue, Kenai, 283.7535, extension 231,
with questions.
Carol L. Freas, City Clerk D/211
i.®.i
US Army Cor08
of Engineers
Alaska Ois~rict ¢, % J ®(F
7`he ur®se ®f this meeting is t® discusso
® Need for bank stabilization of the bluff at
FGenai
® study History (previous studies and concerns)
® Current studies and design concepts
® Identify further concerns and considerations
of bank stabilization
;..,~
US Army Corps
O~EOB~neers
A,asw°,s~°~° nvius tuies
Pertinent Technical Studies
® PN&D Concept Report, January 2000
® Corps Technical Report, May 2006
® Corps Design Alternatives Report -Ongoing
4
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US Armv COlPS [ OePI /~~b C
OI EOBIneers
Alaska Olslrlcl
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US Army Corps
Of Enplaears
Alaska Olatrfcl
IV nc t ~
® ®eveloped by Peratrovich, Nottingham,
and ®rage Engineers, inc for City of Kenai
® Presented a bank stabilization concept
® Submitted to agencies for preliminary
permit application
® Study ended evithout resolution of
comments and concerns
6
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US Army Corps
Alaska Distrfd
e`Eee'peBfS nce~at i°f
Summary of Agency Comments -EPA, Sep 10, 2001
® Conduct sediment transport study to reduce the
uncertainty and verify conclusions of pervious work
® Conduct hydrologic analysis of impacts of the structure
with emphasis on potential for induced erosion upstream
and downstream and channel changes
® Establish baseline survey of current bird and fish use of
the portion of the mud shore of the river which is the site
of the proposed project better understand extent of habitat
loss which would occur as a resul4 of the replacement with
a hard structure
® Evaluate impact of physical changes to biota of this
system
®,
US Army Corps
of Engineers A® ®®LIi ~®® 6
Alaska DlsViq
Summary of Agency Comments - ADF~G, Sep 7, 2001
® Complete ecosystem analysis of structure and function of the estuary
® Analyze how project well change hydrolagic patterns at and upstream
of project area, including impact So wetlands on south shore and
anticipated successional changes 4o the river channel
• Evaluate changes 4o physical and chemical productivity of river
mouth as natural erosive process is altered
® Evaluate how changes in water depth, velocity, and predation patterns
will affect acclimating and outmigrating salmon and smolt
® Evaluate marine wildlife use, including where and what they feed on,
and how projec4 will impact food resources and use of the area
s Provide info on projec4 design life and potential impacts to river if the
channel undercuts and destabilizes the toe of the rock fill
® Analyze project function at 100-year flood event during max high tide
® Evaluate alternatives including cost versus benefits and impacts to
fish and wildlife resources with consideration of real estate purchase,
easements, removal of structures, and trail along top of bluff to
minimize tidal footprint
;,®,;
us Armr corps
of Engineers pyO~ syq ,r( pyp p{aT/,
Alaska Distntt IIV6 6Jl 6
Summary of Agency Comments ~ USFVVS Sep 10, 2001
® ®emonstrate that there are no practicable
alternatives involving less adverse impact on the
aquatic environment such as locating the trail at
the top of the bluff or purchasing bluff
easements to reduce the need for stabilization
® ®emonstrate that practicable measures have
been taken to minimize impacts to the aquatic
environment
® Identify mitigation for potential negative effects
to fish and wildlife habitat and wetland
hydrological functions
;,®,;
Us Anny Cor05
of Engineers ,eryp ,p~yd..pe
Alaska 0isfrid III.V
Summary of Agency Comments - NM~S, Sep 6, 2001
® explore alternatives to providing for a trail and
stabilizing the failing banks, such as to
incorporate bioengineering techniques
® Provide design alternatives that would minimize
or avoid impacts
® Provide adequate mitigation for a project of this
size
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oSAtiny i:Otps ®r/J~ ®f ngineer~'
A~ sxa~o~st3ct
liter®Itseent
Directed by Congress beginning in 2002 to conduct
technical study of bluff erosion at Kenai
Study iS not a f®rmal NEpt4 aCti®n (National Environmental
Policy Act)
Corps is following its planning process
® Existing conditions
e Without project conditions
s Develop alternatives
® Evaluate alternatives
® Compare alternatives
~~ ® Select recommended plan
~,®~~
USAtmY COtGS r S Technical a rt
Ol Enyine0rs
Alaska District ®®
a I
Report focused on environmental issues associated
with stabilization of the bluff
Studies tailored to address agency concerns from
PN~D concept
Did not develop bank stabilization designs
Report available at:
http://www.poa. usace.army.mi I/en/cwlreports. htm
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US Army Cops
O(EM131peff~3 q® ++~~ y 66
Alaska Ois~~ict ®1 r$V • ~11'Y n,~' ®gppT
Report Components
® Environmental baseline data collection
- Benthic infaunal invertebrates survey
- Annual bird and marine mammal surveys
- Fisheries data collection (ADF&G)
® Erosion and Sediment Transport
- Evaluated bluff erosion mechanisms
- Sediment Budget -relationship of bluff erosion to
stability of beach dunes
- Sediment analysis performed by Corps research
13 lab in Vicksburg, Mississippi
®,~ herd and marine mammal survey sectors
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US Army Corps
Alaska DisVlct
pf Enginaera rS T"chnrce~l a ®rt
Report Components (cont'd)
® Hydraulics -Evaluated hydraulic impacts of
PN&D concept design
- Wave influence on south shore
- HEC-RAS model to evaluate riverine
characteristics -depth, velocity, flow patterns
® Ceotechnical Investigations
- Subsurface exploration -four test borings drilled
to depths ranging from 37 to 100 feet
- Determine if slope stability was contributing to
bluff erosion
- Well flow test to estimate soil permeability
,6
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US Ariny Corps
al Engineers Y/q~ `~/~p~qa /q yp/ ~/.pe
Alaska Diskicl I N O VP'4~1~®6-0MI M
Report Components (cont'd)
® Economics and socio-economics
- Cursory economic evaluation
- Analysis limited to National Economics
® Cuiturai Resources
- Limited assessment
- Historical properties and archeological sites along
bluff
16
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us army cores
Aldskd Disfnct
„£~gl~dard ®rps Technical eprt
Findings and Conclusions
13iuff erosion due to several contributing factors
- Wave action at the toe of the bluff
- Groundwater seepage and piping from the upper
sand layer
- Groundwater seepage, piping, and hydrostatic
pressure build up in the lower clay layer
- Runoff draining over the bluff
- Freeze thaw effects weakening the bluff
,~
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us army torus
Aidskd oism~t
o,E~,gi~derd ®rps Technical Rep®rt
Findings and Conciusions (cont'd)
Project footprint of PN~® Concept
- Rock revetment above river water level -50% of time
- Cross-section area of project is insignificant relative
to area of river at half-tide level or higher
No changes to hydraulics of river -velocity, depth,
flow patterns
- Would not redirect wave energy to south shore
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us Army corns
Alaska Dlstac~
°`E°a'118Bf5 rp~ Technical eprt
Findings and Conclusions
Environmental Footprint of PN&D Concept
- Low-value tidal area
- Likely not to alter bird and fish use of the river
19
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®~~
OS Atmy Corps
Alaska DisVicl
o,Ep9ipaar= rF3~ Technical er
Findings and Conc{unions (cont'd)
Bluff and Beach Dunes Material
- Bluff erosion provides minor contribution to beach
dunes
- Bluff erosion contributes about 7% of sediment to
river's sediment load
- Major source of dune nourishment is material
transported along Cook Inlet shoreline from the
north
20
engineering Consultant Tetra Tech, Inc and
subconsultants to perform:
- Geotechnical Investigations
- Bank Stabilization Design Alternatives
- Cost Estimating
- Surveying and Mapping
Corps to perform:
- Economic analyses
- Environmental evaluations -Not NEPA
- Plan formulation
- Other work? To be determined during scoping
2, meetings like this one
oS ArmY COrPS / Sl / ® I ~/ ~ a~I Y C+
1 EnBinnors
Alaska DisUitl
1°t ® -? 111
Report Components
22
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cUS Army Carps r LS- 11 ltrat-v~
(Engineers
glaska District
~/.1®l't ® 11 ®111
Report Components (cont'd)
dank Stabilization ®esign Alternatives
25
:,~,;
IEnBi^ea,s
glaska DisVlct
1't ® 11 111
What's Next?
®eveiop 13raft Report
Conduct in~house review
Release report to public for comment
tioid public meeting to discuss report and
comments
25
;,,,;
asA~,y~°,ps tab®lezatl®n r®ject
renvmoors
Alaska Dislriq
G'M/~{®~?l11 ~I1 t
Currently no Corps authority or funding to
construct a project
Should Corps be authorized to construct, then
NEPA process wouid occur
Should City of Kenai pursue construction, then
per mit$ing pr OCesS ilJtiiiid o%%iir
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US Amry Corps
d envi~+eers
Aiasez Dismcr
6~'
tJS Army Engineer ®istrict, Aiaska
Patrick Fitzgerald
P.C. Eox 6898
Elmendorf AFi3, AK 99506-6898
Phone:907-753-5638
Fax: 907-753-2625
E-Mail: patrick.s.fitzgerald@usace.army.mil
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