2003-02-24 EC Agenda PacketAGENDA
GOLDEN VALLEY ENVIRONMENTAL COMMISSION
Regular Meeting
Golden Valley City Hall, 7800 Golden Valley Road
Council Conference Room
Monday, February 24, 2003
7:00 P.M.
I. Call to Order
IL Approval of Minutes — January 27, 2003
III. Urban Stream Management Presentation by Guest Speaker,
Jason Moeckel, Stream Habitat Specialist with MnDNR
IV. 2003 Approved Environmental Commission and City Council Meeting
Schedules (Handouts)
V. Program/Project Updates -
.- Natural Resources Inventory
NPDES Phase II
' BCWMC Second Generation Plan
Boone Avenue & Trunk Highway 55 Project
Wirth Beach
Bassett Creek Park Pond
Proposed Developments
VI. Discussion Regarding Commission's Interaction with City Council
VII. Other Business
VIII. Adjourn
G:\Environmental Commission\Agendas\022403.doc
Environmental Commission
Approved 2003 Meeting Dates
January 27
February 24
March 24
April 28
May 19*
June 23
July 28
August 25
September 22
October 27
November 17**
December 15***
"Due to Memorial Day, May meeting will be held on the third Monday of the month.
"`Due to Thanksgiving, November meeting will be held on the third Monday of the month.
"'Due to Christmas, December meeting will be held on the third Monday of the month.
G:\Environmental Comm ission\Miscellaneous\2003ApprvdMtgSched.doc
January 7
January 21
February 4
February 18
March 4
March 18
April 1
April 15
May 6
May 20
June 3
2003 Meeting Dates
CITY COUNCIL MEETING DATES
6:30 P.M. - COUNCIL CHAMBERS
July 1
July 15
August 4 (Monday)
August 19
September 2
September 16
October 7
October 21
November 5 (Wednesday)
November 18
December 2
June 16 (Monday) December 16
Tracy Pharr - Environmental Commission - Miscellaneous Topics Page 1
From: Tracy Pharr
To: anderbake@isd.net
Subject: Environmental Commission - Miscellaneous Topics
Good morning, Rich.
Following are responses to the issues you requested I look into that were raised at last night's
Environmental Commission meeting.
1. The 2003 meeting calendar was approved. The November date was changed from the 24th to the
17th. The December date was changed from the 22nd to the 15th. As requested by former Mayor Mary
Anderson, no Jewish holidays are impacted by the Commission's calendar.
2. Judy Nally indicated that City Council meeting minutes are still available on the City's website, and will
be updated promptly.
3. Interviews will be conducted on February 5 and 19 to fill the two Commission vacancies. New
members should be appointed by the end of February, and as such, will be notified of the March meeting
(or, the February meeting, should time permit).
4. Following are the e-mail addresses for the current Commission members.
Sue Hess - shess@esgarch.com
Dawn Hill - Dawn.L.Hil1 @wellsfargo.com
Alan Kuentz - agkuentz .aol.com
Sara Peterson - no address provided; work phone - 612.752.7326; home phone - 763.588.3208
CC: Al Lundstrom; Jeannine Clancy; Jeff Oliver
Golden
Open Space & Recreation Commission
Meeting Minutes
Brookview Community Center
January 27, 2003 — 7:00 PM
CALL TO ORDER
Meeting called to order at 7:00 p.m.
II. ROLL CALL
Present: Tom Zins, Jerry Sandler, Chuck Cahill, Jim Vaughan, Jim Johnson, Lance Ness and
Roger McConico.
City Staff: Rick Jacobson, Director of Parks & Recreation
Sheila Van Sloun, Administrative Assistant
Barb Bailey, Senior Citizen Coordinator
Others Present: Brittany Meyer, Tobacco -Free Youth Recreation
LeeAnn Mortensen, Northwest Hennepin Human Services Council
Paul Pentel, Tobacco Free Youth Recreation Board Member and Resident of Golden
Valley
Absent: Liz Elder and Tom Kuelbs, Jr.
III. AGENDA CHANGES OR ADDITIONS
Additions to Other Business by Rick Jacobson:
1) Barb Bailey's Award Recognition
IV. APPROVAL OF MINUTES —November 25. 2002
MOTION: Moved by Jim Johnson, seconded by Jim Vaughan, to approve the minutes.
Motion carried.
V. TOBACCO FREE POLICY PRESENTATION — Brittany Meyer
Brittany Meyer from Tobacco -Free Youth Recreation handed out pamphlets and flyers containing a wide
variety on information on tobacco use. She then stated that there are currently 15-20 other cities in
Minnesota considering tobacco -free facilities and/or parks.
Brittany explained that the Tobacco -Free Youth Recreation program is designed to assist recreational
groups in their efforts to model and promote healthy tobacco -free lifestyles for young people who are
TOBACCO FREE POLICY PRESENTATION — Brittanv Mever (cont.
involved in community-based recreational programs. In their effort to do so, the TFYR program has
created signs available to Cities, free of charge, for posting in areas where youth recreation activities take
place.
Jerry Sandler wanted to know if the city chose to adopt an ordinance versus a policy, would the
ordinance number need to be posted on the sign. Brittany said that in her opinion, it did not. She added
that half the cities create a policy and half create an ordinance. She then said what's most important is
reducing the use of tobacco as a whole, whether policy or ordinance.
Jerry then stated that his intention is to have no tobacco use at youth activities only, not all City owned
parks and open space areas.
Roger McConico said that he is fine with having no tobacco at youth activities, but he does not think that
we should consider restricting it to all park areas and activities. He strongly feels that it's not the City's job
to keep kids away from tobacco, but rather the parent's job.
Tom Zins asked Roger if he would be opposed to the City having a policy and Roger stated that he was
against it for the fact that he doesn't feel that the City should be deciding where people can smoke in
public, but that he was not totally opposed to a policy of no smoking during youth games.
Paul Pentel said that having a policy and posting signs will greatly help discourage tobacco users from
smoking in youth athletic areas. He also said that it makes a strong health statement. LeeAnn Mortensen
added that if kids always see tobacco use, it gives them the sense that it's normal, OK and/or acceptable.
Jim Vaughan asked the Commission's opinion on where the signs would be placed to make this effort
effective. Jerry Sandler stated that the signs would be most effective if posted on the backstop at the
parks where youth games are played.
Jim Vaughan also wanted to know where we would draw the line on fields where both youth and adults
would play. Jerry Sandler said that he thought the signs stating "no tobacco use during organized youth
activities," would take care of the problem.
Jim Johnson added that the Commission is just looking for a tobacco -free policy. Their intention is not to
go after smokers.
The following motion was moved by Lance Ness and seconded by Chuck Cahill.
MOTION: In order to protect the health and welfare of our children, Golden Valley Parks and
Recreation prohibits the use of all tobacco products during organized youth activities. In
order to protect the health and welfare of our children, Golden Valley Parks and Recreation
requests that there be no use of tobacco products in this youth activity area. This includes
all playing spaces, spectator viewing areas and parent/supervisor resting areas. Motion
carried (6 Ayes, 1 Abstention).
VI. RECREATION REPORT — Barb Bailey
Barb Bailey distributed the 2002 Senior Annual Report and the February Senior Newsletter. She then
gave a brief summary on the programs, including; Advisory Committee, Social Clubs, Special Events,
Special Interest Groups, Golden Valley Senior Chorus, Excursions and Classes.
Barb mentioned there were twenty-five one -day trips and four overnight trips in 2002. She also stated
there are over 2,000 members with the average age being mid to late 70's. Barb's staff includes one
RECREATION REPORT — Barb Bailey (cont.)
half-time Senior Program Assistant, two part-time Program Leaders and seven other part-time Instructors
and Special Interest Group Leaders. She also has seven Staff Volunteers.
Barb also discussed upcoming events along with the many excursions planned for 2003.
VII. OLD BUSINESS
1) With Beach Study Update — Roger McConico informed the Commission that at the next meeting
the Wirth Beach Study Committee would be presenting the final proposal, which would include a
reconstructed bathhouse with many updates, a retaining wall separating the improved beach area
and park lawn, reshaped and reconstructed parking lot with a water garden and new play
equipment.
2) Brookview Area Street Reconstruction Update — Rick Jacobson explained that he and Barb
Bailey had recently met with the Engineering Department and SEH to discuss the Brookview
parking lot reconstruction. He stated they explained to Engineering and SEH why they felt the lot
should remain as is. Rick then requested from them a proposal that would include 60 degree angled
parking and logistical changes that would improve safety as much as possible. He added that the
construction would take place after Labor Day.
Rick then stated that the Brookview Park reconstruction would begin August 4th with improvements
to Brookview Park, Brookview Parkway and Western Avenue. Improvements to be made at
Brookview Park will include; shelters, lighting, trails, parking lots, ball field, ponds and the park
entryway. Therefore, park shelter reservations will not be taken after August 3rd. Rick explained that
the tennis courts would remain available.
VIII. OTHER BUSINESS
1) Barb Bailey's Award Recognition — Rick Jacobson announced that Barb Bailey was awarded the
Clifton E. French Distinguished Service Award on January 16th. This award is the highest
recognition in the state within the Park & Recreation field.
XI. ADJOURNMENT
MOTION: Moved by Jim Johnson, seconded by Roger McConico to adjourn. Motion carried.
Meeting adjourned at 9:15 p.m.
Bonestroo
Rosene
,u Anderlik &
Associates
Engineers & Architects
January 22, 2003
Bonestroo, Rosene, Anderlik and Associates, Inc. is an Affirmative Action/Equal Opportunity Employer
and Employee Owned _
Principals: Otto G. Bonestroo, P.E. • Marvin L. Sorvala, PE. • Glenn R. Cook, PE. • Robert G. Schunicht, RE.
Jerry A. Bourdon, PE.
Senior Consultants: Robert W. Rosene, P.E. • Joseph C. Anderlik, P.E. • Richard E. Turner, PE. • Susan M. Eberlin, C.P.A.
Associate Principals: Keith A. Gordon, PE. • Robert R. Pfefferle, P.E. • Richard W. Foster, P.E. • David O. Loskota, P.E.
Mark A. Hanson, P.E. • Michael T. Rautmann, PE. • Ted K. Field, P.E. • Kenneth P. Anderson, PE. • Mark R. Rolls, PE.
David A. Bonestroo, M.B.A. • Sidney P. Williamson, P.E.. L.S. • Agnes M. Ring, M.B.A. • Allan Rick Schmidt, P.E.
Thomas W. Peterson, P.E. • James R. Maland, RE. • Miles B. Jensen, PE. • L. Phillip Gravel III, RE. • Daniel J. Edgerton, PE.
Ismael Martinez, P.E. • Thomas A. Syfko, P.E. • Sheldon J. Johnson • Dale A. Grove, P.E. • Thomas A. Roushar, P.E.
Robert J. Devery, P.E.
Offices: St. Paul, St. Cloud, Rochester and Willmar, MN • Milwaukee, WI • Chicago. IL
Website: www.bonestroo.com
Jeannine Clancy, Director of Public Works
City of Golden Valley
7800 Golden Valley Road
Golden Valley, MN 55427
RECD! JI A, N 2 3 7_003
Re: Proposal for Bassett Creek Park Pond and Bassett Creek South to Duluth Street
Project
Dear Jeannine:
Thank you for requesting a proposal from our firm for services for the City's proposed
project on Bassett Creek between the Bassett Creek Park Pond and Duluth Street. This
letter briefly summarizes our understanding of the project, our project tasks, and the
estimated hours and compensation to complete those tasks.
Project Description
The Bassett Creek Park Pond was created in the past by a private developer, as an
amenity to surrounding residences. However, the pond is an ongoing maintenance
problem for the City. The maintenance concerns limit the aesthetic value and water
quality benefits of the pond. In addition, the City has identified several locations where
bank and outfall erosion are problems between the pond and Duluth Street.
The City has requested a proposal for a project to detail the existing conditions and
issues in the project area, and develop a plan to successfully address these issues. The
consultant needs to work with neighborhood residents and natural resource agencies in
developing the plan, to assure that it is acceptable to the neighborhood and meets
permit requirements. The City is also requesting specifications and cost estimates
based on the final plans, administration of the bidding process for the project,
coordination, and inspection of the project construction.
Basic Services
We have divided the tasks for the project into two phases—Phase I: Preliminary Design,
and Phase II: Final Plan and Construction. Bonestroo will provide the following Basic
Services for this project:
2335 West Highway 36 . St. Paul, MN 55113 . 651-636-4600 . Fax: 651-636-1311
Phase I: Preliminary Design
Task 1 — Review Existing Information
We will review and analyze the following as part of this study:
• Aerial photography and topography
• Golden Valley Surface Water Management Plan
• Golden Valley's Bassett Creek Inventory
• Bassett Creek Water Management Commission's (BCWMC) Flood Control
Plan
• BCWMC Water Quality Study of the Main Stem of Bassett Creek
• BCWMC info on MnDOT Maintenance Facility (this was a problem area in
the past) and adjacent property
• City information regarding sanitary sewer backups and flooding problems.
Task 2 — Preliminary Report and Analysis
A preliminary report will be developed that includes the following:
• Details the existing conditions
• Determines the major sediment source to the pond
• Identify and design water quality improvements, including bank
stabilization, vegetated buffer zones, and others
• Identify specific locations for water quality improvements
• Ensure total floodplain volume is maintained
• Provide options to eliminate the annual maintenance of the Bassett Creek
Pond
• Identify options for managing existing storm water flows and drainage from
the adjacent MnDOT facility
• Identify causes of sanitary sewer problems and options for improvements to
protect an adjacent residence.
• Analysis of the stream bank and outfall erosion on Bassett Creek between
Bassett Creek pond and Duluth Street
• Provide site location map and description of each stream bank erosion site
• Concept design for streambank and pond improvements along with
discussion of improvements, including plantings, aethestic features, etc.
• Determine permits and agencies that need to be notified of a potential
project
Task 3— Public Participation Efforts
We will work with the City to inform the neighborhood and natural resource
agencies about the project and facilitate their participation in the design of
proposed improvements. This will include the following:
• Facilitate three meetings with neighbors in the project area to discuss the
project. This will include a first meeting to identify the project and discuss
issues and concerns; a second meeting to provide preliminary designs
and get comments; and a final meeting to present the final plan for
improvements to the pond and creek.
• Facilitate up to two meetings with natural resources agencies, including
DNR and the Bassett Creek Watershed Commission, to discuss issues,
concepts and plans for improvements.
• Facilitate a meeting with MnDOT to discuss drainage issues related to
2
their site, and options for improvements.
Task 4 — Surveying
We will survey the entire project area from Duluth Street to the pond. As part of
Task 2 we will be providing locations of streambank erosion sites within the project
area. It is our understanding that there are at least two streambank areas that will
require stabilization. Pond contours will also need to be surveyed to create final
plans. For purposes of this proposal we anticipate two to three streambank
erosion sites will need to be surveyed, along with the Bassett Creek Park Pond and
the project area, to develop construction documents.
Task 5 — Preliminary Design
We will prepare preliminary design details for each site including:
• Plan view of the creek and improvements
• One cross section for each streambank stabilization site
• Proposed grading plan for the pond improvements
We will meet with City Staff to finalize details of the preliminary design.
Phase II: Final Design and Construction
Task 6 — Final Plans, Specs and Bidding Assistance
After receiving final comments from City staff we will prepare final plans and
specs. We will provide 20 copies of the plans, specs and bidding documents
including:
• Final creek layout and bank stabilization
• Typical cross sections and construction details
• Requirements and information to bidders
• Contract and bidding documents
• Corresponding specifications for the construction of the improvements
• Electronic files of documents prepared and survey data collected
• Answering questions from bidders, suppliers and subcontractors
• Attending the pre-bid meeting and field visit
• Evaluating bid -proposals
We recommend having a pre-bid meeting for the interested contractors, including
a walk of the creek. The site visit would help to answer construction -related
questions and generate well-prepared bids.
Task 7— Construction Assistance
As part of this task we will help the city by providing:
• Coordination with the contractor
• Construction observation
• Weekly meeting and minutes as necessary to update the City Staff
• Construction staking
• Construction testing if necessary
• Prepare record drawings of all improvements in a hard copy and digital
format compatible with City's Autocad and Land Development Software
3
Supplemental Services
Additional meetings, design and construction services may be provided when authorized
by the City as Supplemental Services, and will be billed at the hourly rates shown in the
Billing Rate Schedule attached as Appendix B, plus Reimbursable Expenses.
City Responsibilities
The City will provide all existing plans, inventory information and base maps for this
Project in hard copy and electronic format (when available). City staff will work with
Bonestroo staff to provide background information and discuss concerns and priorities
for project tasks. City staff will coordinate local meetings, mailings, or other publicity.
City staff will review draft plans and work products, and provide comments and
suggestions for final plans.
Cost
For the purpose of estimating this cost, we have assumed three restoration/stabilization
sites and the pond improvement. For completion of the tasks outlined above, the City
will pay the Consultant a total estimated fee of $ 29,950 for Phase I, and $13,320 for
Phase II, or a total of $ 43,270 for all Basic Services. Reimbursable Expenses will be
billed at cost. A breakdown of estimated labor and hours is provided on the attached
Table.
Please call me at (651) 604-4838 to discuss the proposed tasks or other issues. Thank
you for requesting our services for this project.
Sincerely,
BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC.
Sherri A. Buss, M.L.A.
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Home floods during
large storm events -
cause is unclear.
Neigborhood storm sewer
needs pre-treatment
before entering creek.
City inventory identified
erosion areas along
Bassett Creek.
4•-i
Created pond is an
ongoing maintenance
problem for the city.
Runoff from MNDOT
property contributing
volume and sediments
creek without pre-treatment.
Oak woodland is in good
condition and includes
large maple trees.
t awl 401
Bassett Creek Pond and
j Bassett Creek North to Duluth Street Project
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j:/gis/marketing/sp999-03-001.apr 9
Perch Lake Trail Access and Shoreline Stabilization
St. Croix County, W1
Above, the shoreline
during construction. A -
jacks are visible at
water's edge. Cribwall
and plantings not
installed.
Left, the re-established
shoreline and slope.
Bioengineering Solutions Provide Trail Access
to Lake While Maintaining Soil, Aesthetics
Steep shorelines meant difficult access to a new
regional park's beach on Perch Lake in St. Croix County,
WI. Bonestroo used innovative bioengineering
techniques to provide a trail to the beach, stabilize the
surrounding soil, and maintain the lakeshore's aesthetics.
Challenges included:
• Steep topography (1.5:1) with sandy soil
• Fluctuating water levels
• Wave and ice action
• Shoreline erosion
• Maintaining the shore's natural appearance
We selected a number of structure and vegetation
bioengineering methods to help meet these challenges.
A vegetated cribwall was constructed on the slope
adjacent to the lake to allow room for the trail without
encroaching on the lake. The cribwall is a box -like
structure built with 6 -inch gaps between the timbers
where vegetation is planted that will help hold soil in
place when established. During vegetation
establishment, the timbers stabilize soil. The vegetated
cribwall acts like a retaining wall, but provides a more
pleasing, natural appearance.
Cement a jacks were buried in the slope to help protect
the trail from wave action and provide support to the
trail fill. Willows were planted in clumps and alternated
with meadow plantings to help retain soil and maintain
aesthetics.
Pregrown "pizza patches"—vegetation rooted in a
coconut fiber blanket—were secured below the
waterline along the slope to provide instant vegetation
and help prevent erosion.
Our bioengineering techniques at Perch Lake resulted in
easy access to the lakeshore, a stabilized shoreline and
pleasing aesthetics.
In addition to bioengineering expertise, we provided
other specialty services toward the development of this
new park including building architecture, trails and
engineering for roads. Bonestroo
0 Rosene
Anderlik &
Associates
Engineers & Architects
Delosh Ravine Restoration ,
Eagan, MN
Y At left, the restored ravine.
Below, some of the newly
established plantings that are
helping to stabilize the ravine.
Natural Restoration Saves Money While Providing
More Effective Erosion Control
Delosh Ravine, located on the Minnesota River bluffs in
northern Eagan, is a sharply incised valley with a small
perennial creek flowing through it. The Delosh Ravine
has experienced significant development pressure in its
watershed that has encroached on its fragile banks and
altered its flows. As a result, the creek bed was actively
downcutting and producing an enormous sediment load
downstream.
Bonestroo considered two options to control the
erosion problem — one bioengineering, and the other to
pipe the stream and fill in the ravine. In keeping with the
residents' wishes to maintain a natural amenity,
Bonestroo pursued the bioengineering solution.
Four problems were encountered:
• Downcutting of the stream
• Eroding slopes, with no parent material or vegetation
• Seeps along the eroding slopes making them
permanently saturated and unstable
• Tile line discharge to the slopes, causing surface
erosion
Rock weirs controlled down -cutting and reduced the
stream's slope and flow velocities. Live willow fascines
(willow branches cut and bundled together to form 10 -
to 15 -foot long cylindrical structures) restored eroding
slopes.
The root structure that develops prevents shallow earth
slides. The fascines protrude slightly above the ground
surface, which allows them to trap sediment while
helping to eliminate surface erosion. Bonestroo also
developed a special seed mix that would adapt to the
site's shady conditions.
Live willow stakes were used at the seep (saturated)
locations along the slope. The willow stakes are cut from
dormant plants and inserted two to three feet below the
surface, where they take root, providing deeper
stabilization than traditional ball and burlap shrub
plantings. The actively growing willow stakes also
extract excess moisture from the seeps. A year after
they were planted, they had created a living root mat
that stabilized the soil and promoted vegetative growth.
The the line discharges were piped to the toe of the
slope, and live willow fascines were installed on the
slope to provide stabilization.
Bonestroo provided plans, specifications, surveying and
construction observation services. The bioengineered
approach cost less than the estimated budget for the
traditional pipe approach.
JABonestroo
Rosene
"Anderlik &
Associates
Engineers & Architects
` \
N-4
ip •�
f;
Natural Restoration Saves Money While Providing
More Effective Erosion Control
Delosh Ravine, located on the Minnesota River bluffs in
northern Eagan, is a sharply incised valley with a small
perennial creek flowing through it. The Delosh Ravine
has experienced significant development pressure in its
watershed that has encroached on its fragile banks and
altered its flows. As a result, the creek bed was actively
downcutting and producing an enormous sediment load
downstream.
Bonestroo considered two options to control the
erosion problem — one bioengineering, and the other to
pipe the stream and fill in the ravine. In keeping with the
residents' wishes to maintain a natural amenity,
Bonestroo pursued the bioengineering solution.
Four problems were encountered:
• Downcutting of the stream
• Eroding slopes, with no parent material or vegetation
• Seeps along the eroding slopes making them
permanently saturated and unstable
• Tile line discharge to the slopes, causing surface
erosion
Rock weirs controlled down -cutting and reduced the
stream's slope and flow velocities. Live willow fascines
(willow branches cut and bundled together to form 10 -
to 15 -foot long cylindrical structures) restored eroding
slopes.
The root structure that develops prevents shallow earth
slides. The fascines protrude slightly above the ground
surface, which allows them to trap sediment while
helping to eliminate surface erosion. Bonestroo also
developed a special seed mix that would adapt to the
site's shady conditions.
Live willow stakes were used at the seep (saturated)
locations along the slope. The willow stakes are cut from
dormant plants and inserted two to three feet below the
surface, where they take root, providing deeper
stabilization than traditional ball and burlap shrub
plantings. The actively growing willow stakes also
extract excess moisture from the seeps. A year after
they were planted, they had created a living root mat
that stabilized the soil and promoted vegetative growth.
The the line discharges were piped to the toe of the
slope, and live willow fascines were installed on the
slope to provide stabilization.
Bonestroo provided plans, specifications, surveying and
construction observation services. The bioengineered
approach cost less than the estimated budget for the
traditional pipe approach.
JABonestroo
Rosene
"Anderlik &
Associates
Engineers & Architects
Mouse River Park Streambank Bioengineering
Renville County Water Resource District and Renville County, ND
Combination of Bioengineering Techniques Help
Protect Homes and Restore Shoreline
Riverbank erosion threatened homes along 1,000 feet of
the Mouse River in Renville County. The naturally steep
shoreline was losing soil due to watercraft wakes, and a
lack of vegetation and its associated root structures. A
box culvert bridge sending a flow directly at the
riverbank aggravated the situation. The challenge of
restoring the shoreline was especially difficult because
the homes were so close to the water that there was no
room for equipment—all restoration work had to be
done from the river itself.
Bonestroo addressed these problems in a bioengineering
demonstration project that alleviated the danger to
homes and stabilized the riverbank.
The primary goal of stabilizing the steep slope (1.5:1) was
complicated by the Army Corps of Engineers' jurisdiction
over the river, meaning the slope could not be extended
further into the river.
A temporary access road was built along the river during
construction. Material from this road was not wasted. As
a section of shoreline was completed, road materials
were removed and used to rebuild the slope until
equipment was taken from the site.
A jacks—interlocking concrete structures—were used for
toe slope protection where discharge from the box
culvert was eroding the bank. A lower-cost vegetated
geogrid was used on top the A jacks to stabilize the
slope, a method allowing root structure redevelopment
for added soil stabilization. Riprap was substituted on
lower flow areas to save money.
Another technique used was a vegetated cribwall. The
cribwall is a bar -like structure built with 6 -inch gaps
between the timbers where vegetation is planted that
will help hold soil in place when established.
Along portions of the river with a lower shoreline and
without concentrated flow, we revegetated the slope
and used a biolog to protect plantings from wave action.
Bonestroo
JA Rosene
"Anderlik &
Associates
Engineers & Architects