HomeMy WebLinkAboutItem 03.bCity of Lakeville
Public Works – Engineering Division
Memorandum
To: Mayor and City Council
From: Zach Johnson, City Engineer
Mac Cafferty, Environmental Resources Manager
Copy: Justin Miller, City Administrator
Chris Petree, Public Works Director
Date: March 28, 2016
Subject: South Creek Restoration Project
City Council Action Requested
Staff will introduce a potential project and request direction as to whether or not to proceed with:
• A Joint Powers Agreement (JPA) with the Vermillion River Watershed Joint Powers
Organization (VRWJPO) for a Feasibility Study and Design
• An Agreement with Wenck Associates for professional services to complete a Feasibility
Study (Phase 1); CLOMR/LOMR (Phase 2 – if applicable); Project Design, Bidding and
Construction Oversight (Phase 3)
Overview
City and VRWJPO staffs are working in partnership to improve the water quality of South Creek
and meet waste load allocation reductions, as required in the City’s Minnesota Pollution Control
Agency’s Municipal Separate Storm Sewer System (MS4) permit requirements. A storm water
basin located southwest of the Holyoke Avenue/210th Street intersection is experiencing bank
failures and mixing water with South Creek. The water mixing is contributing to water quality
impairments in South Creek and the Vermillion River. The proposed feasibility study will
evaluate options to reduce erosion and sedimentation downstream, lower stream temperatures
and increase oxygen levels in South Creek to improve water quality and wildlife habitat.
Attached is a draft JPA between the City and the VRWJPO. The VRWJPO will fund up to
$65,000 for a feasibility study and preliminary design. Also attached is a proposal for
professional services from Wenck Associates that provides a project scope in three phases. After
a feasibility study (Phase 1: $16,300) is completed, staff will review the results with the City
Council. A CLOMR/LOMR (Phase 2: $28,000) and Project Design, Bidding and Construction
Oversight (Phase 3: $51,000) will be completed only after a final option is selected and authorized
by the City Council.
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0 200 400100 Feet
Legend
Flood Hazard Zones
1% Annual Chance Flood Hazard
Regulatory Floodway
All Saints Property
Current Channel
Wenck Associates, Inc. | 1800 Pioneer Creek Center | P.O. Box 249 | Maple Plain, MN 55359-0249
Toll Free 800-472-2232 Main 763-479-4200 Email wenckmp@wenck.com Web wenck.com
March 4, 2016
Zach Johnson
City Engineer
City of Lakeville
20195 Holyoke, Ave
Lakeville, MN 55044
RE: Golden Pond Channel Feasibility Study
Dear Mr. Johnson:
As you requested, Wenck Associates, Inc. (Wenck) submits this proposal to assist the City of
Lakeville in the preparation of a feasibility study to determine options to provide a stable and
reliable conveyance for the West Branch of South Creek along the south and east side of
Golden Pond in Lakeville. Based on the “Field Observation and Preliminary Recommendation
for South Creek/Golden Pond Improvements-Lakeville, MN” prepared by the Dakota County
Soil and Water Conservation District, the described channel is in need of repair as it has been
breached in several locations. The breaches have resulted in a temperature increase at the
pond outlet near the railroad.
We understand that you are also interested in completing a Letter of Map Revision. As a result
of that interest we called Suzanne Jiwani at the Minnesota DNR. Because she is on an
extended vacation we spoke with Ceil Strauss and Rita Weaver. The result of that phone
conversation was that a CLOMR/LOMR may not be necessary if the selected repair option does
not move the floodway and the design engineer can attest to a “no rise” certification. The “no
rise” calculations will be done during the feasibility study phase as part of the hydraulic
analysis. Therefore, since a repair option will not be selected until the feasibility study is
completed at this time we can give you a scope and budget for an optional task should a
CLOMR/LOMR be needed.
We have also provided a description of tasks and a budgetary cost estimate to complete
design, bid and provide construction management services once an option to repair the
channel has been selected.
Our proposed scope and budget is in three phases: 1) a feasibility study through a 30%
design drawing, 2) a CLOMR/LOMR and 3) Project design, bidding and construction oversight.
Phase 1 - Feasibility Study
This feasibility study proposes that Wenck examine several options for each reach.
For the east/west running reach on the south side of Golden Pond Wenck will review the
following options:
1. Move this section to the south and create a meandered reach.
2. Stabilize the existing channel.
3. Place the channel flow in a pipe.
Zach Johnson
City Engineer
City of Lakeville
March 4, 2016
2
T:\1305 Dakota\00\Lakeville\Golden Pond Feasibility Study.docx
For the north/south running reach on the west side of the railroad:
1. Stabilize the open channel.
2. Place the channel flow in a pipe.
Other options:
1. Install a new pipe through the railroad as an extension of the east/west alignment
(near the southeast corner of Golden Pond).
2. Construct a new channel on the east side of the railroad from the new pipe crossing to
the existing channel.
3. Install a pipe from the new pipe crossing to the existing channel.
Wenck will survey the longitudinal profile and measure typical cross sections of the newly
meandered reach and the existing channel. Wenck will use the existing meandered cross
section channel and profile to determine a “normal depth” based flow rate. This flow rate will
be used to size the open channel and pipe replacement options. We will also take soil probes
at 25 foot increments and where we see they are needed. The soil information will be used to
aid the overall design and engineering calculations related to the potential channel options
(i.e. need for pipe bedding, stability of channel soils to support design options, etc.).
Each option will be evaluated for conveyance, change in 100-year floodplain elevation,
constructability and 30-year life cycle cost. A figure will be prepared showing each option in
plan, profile and cross section. A discussion on permitting will also be included.
The total estimated cost for the Phase 1 Feasibility Study is $16,300.
Phase 2 - CLOMR/LOMR
Depending on which option is selected for the repair a Letter of Map Revision (LOMR) will be
needed if the floodway is moved. If the preferred option causes an increase in the 100-yr
floodplain, a Conditional Letter of Map Revision (CLOMR) will be needed followed by a Letter
of Map Revision post project. The tasks necessary to complete this work are:
1. Work with the City or FEMA to get the effective model
2. Prepare a duplicate effective model
3. Prepare an existing conditions model if needed
4. Prepare a proposed project conditions model
5. Compare proposed project conditions to existing conditions or duplicate effective model
6. Prepare a CLOMR application
7. Prepare required GIS figures (topographic and annotated FIRM)
8. Prepare a Technical Memorandum
9. Submit CLOMR model and figures
10. Respond to FEMA comments and resubmit
11. Prepare as-built model
12. Compare results of CLOMR to as-built model
13. Prepare Technical Memorandum on CLOMR to as-built model results
14. Prepare LOMR application
15. Submit LOMR model and figures
16. Respond to FEMA comments and resubmit
Zach Johnson
City Engineer
City of Lakeville
March 4, 2016
3
T:\1305 Dakota\00\Lakeville\Golden Pond Feasibility Study.docx
The estimated cost for Phase 2 CLOMR/LOMR ranges between $19,000 and $28,000
depending on whether a CLOMR is needed. We would be happy to discuss this scope and
budget with you at any time.
Phase 3 - Project Design, Bidding and Construction Oversight
Upon selection of a final option for reconstruction or stabilization of the South Creek channel,
Wenck will work with the City to complete the final engineering and design for the selected
option. Wenck will take the selected option from 30% design established under Phase 1 to
75% design. At this point Wenck would provide a 75% design submittal to the City for review
and comment, including plan sheets and initial quantity and construction cost estimates.
Wenck will then incorporate the City’s comments and complete the final overall design, plan
sheets, project quantities, updated construction cost estimate and permit applications for the
COE, DNR, County, railroad, City and PCA. We are also budgeting four soil borings by a
geotechnical firm should the feasibility study show they are needed.
Upon completion of the project design, Wenck will take the lead to direct the City through the
process of soliciting and selecting bids for the project. Wenck will coordinate all of the
following construction management tasks with the consent of the City:
Prepare the bid announcement and post to Quest CDN and the local official newspaper.
Call five contractors that Wenck is that familiar with and is confident that they know
how to complete the project, to make them aware of the bidding.
Conduct an on-site pre-bid meeting.
Answer contractor questions and post answers to all bid holders.
Prepare bid addenda if needed.
Review bids for math accuracy, unit price outliers, contractor references and
completeness.
Prepare a bid recommendation memorandum.
A visit to the site will be conducted to stake project design elements and participate in a site
overview, walk and discussion with potential construction contractors. Wenck staff will be
available to answer technical questions pertaining to the design and bid documentation during
the bidding process. Once a contractor is selected and work begins, Wenck assumes three
weeks for construction with three site visits per week and two follow up visits for warranty
and vegetation verification plus an initial project kick-off site visit and a final walk through.
We will lead contractor contract administration with executing the contract, pay application
processing and construction progress communication.
Wenck will conduct a post construction survey and prepare record drawings for the City. The
following deliverables would be provided to the City under Phase 3:
75% Plan Set for Review and Comment
Final Plan Set, Quantities and Construction Cost Estimates
Bid Documents
Bid Announcement
Inspection Notes
Construction Photos
Record Drawings
Zach Johnson
City Engineer
City of Lakeville
March 4, 2016
4
T:\1305 Dakota\00\Lakeville\Golden Pond Feasibility Study.docx
The estimated cost for Phase 3 for the project design, final plan set, bidding and construction
management ranges between $44,000 and $51,000. This range also includes costs for
permitting assistance (i.e. submitting the DNR public waters permit application). The cost will
depend on the selected preferred option and the varying factors influencing the final design.
This range for design, bidding and CMS is based on the following:
Eight plan sheets
Possible geotechnical soil borings
Three weeks construction
Permitting with multiple agencies
Publicly bid project
No public or residential meetings
Timely approval from government agencies and the railroad (if necessary)
After a final option is selected, Wenck would be happy to discuss this scope and budget with
City and provide a refined cost estimate for the final option. Wenck will not proceed with
project related items outlined under Phases 2 or 3 of the proposal without prior authorization
from the City, including establishing an agreed upon scope, schedule, and budget.
On behalf of the 270+ employee-owners of Wenck, thank you for this opportunity to work
with the City of Lakeville. Should you have questions or need clarification of information
presented in this proposal please do not hesitate to call Jeff Madejczyk at 763-479-4263
(jmadejczyk@wenck.com) or Ed Matthiesen at 763-479-4208 (ematthiesen@wenck.com).
Sincerely,
Wenck Associates, Inc.
Jeff Madejczyk Ed Matthiesen, P.E.
Principal Principal
cc: Travis Thiel, Vermillion River Watershed - Joint Powers Organization