HomeMy WebLinkAbout6.k. Approve WSB and Associates for Engineering Services for Rosemount Comprehensive Surface Water Management Plan UpdateI:\City Clerk\Agenda Items\Approved Items\6.k. Approve WSB and Associates for Engineering Services for Rosemount Comprehensive Surface Water
Management Plan Update.docx
EXECUTIVE SUMMARY
City Council Meeting: April 3, 2018
AGENDA ITEM: Approve WSB and Associates for
Engineering Services for Rosemount
Comprehensive Surface Water
Management Plan Update
AGENDA SECTION:
Consent
PREPARED BY: Brian Erickson, P.E., Director of Public
Works/City Engineer AGENDA NO. 6.k.
ATTACHMENTS: WSB Proposal APPROVED BY: LJM
RECOMMENDED ACTION: Motion to Approve WSB and Associates Proposal for
Engineering Services for Rosemount Comprehensive Surface Water Management Plan
Update
BACKGROUND:
The City of Rosemount is currently updating its Comprehensive Plan. As part of that update, various
sections of the plan require individual updates. Staff has requested proposals from several firms in the
engineering pool for these updates.
One of the main updates required is the Comprehensive Surface Water Management Plan. In an effort to
maximize efficiency, staff requested a proposal from WSB and Associates (WSB) for this plan due to the
firm’s familiarity with the city’s current plan, and processes as well as their ongoing efforts with the
Municipal Separate Storm Sewer System (MS4) plans. WSB’s proposal consists of two major portions:
1. Update to the Comprehensive Surface Water Management Plan – $28,950
2. Storm Water model update – $48,850
The total cost of the update is $77,800. The current storm water utility budget has $50,000 for the update
to the comprehensive plan. Staff would recommend that the remaining required funding come from the
Storm Water Fund’s fund balance.
SUMMARY:
Staff is recommending approval of the attached Engineering Services Proposal from WSB and Associates.
701 Xenia Avenue South | Suite 300 | Minneapolis, MN 55416 | (763) 541-4800
Building a legacy – your legacy.
Equal Opportunity Employer | wsbeng.com
G:\Group Data\WATER RESOURCES\Proposals\Rosemount\LTR PROP - berickson - CSWMP Update\LTR PROP-berickon- CSWMP Update & City Hydrologic Model Update_032718.docx
March 27, 2018
Mr. Brian Erickson
Director of Public Works / City Engineer
City of Rosemount
2875 145th Street West
Rosemount, MN 55068-4997
Re: Proposed Scope and Estimate of Professional Services Fee
Updates to the City of Rosemount’s Comprehensive Surface Water Management Plan and City-
wide Hydraulic and Hydrologic Model
Dear Mr. Erickson:
Attached for your review and approval is our proposed scope of services, fee, and schedule for providing
professional engineering services to complete an update to the City of Rosemount’s Comprehensive
Surface Water Management Plan (CSWMP) and city-wide hydraulic and hydrologic model. This work plan
focuses on creating a clear, well thought out, user-friendly CSWMP that meets all the regulatory
requirements and provides a framework for the City’s decisions related to water resources management
over the next ten years. The proposed update to the city-wide model will provide additional detail to allow
for a better understanding of the existing storage available within the City, identify areas of concern
utilizing Atlas 14 rainfall data, and determine the required discharged rates and volumes to the Vermillion
River from the land locked basins to provide freeboard protection. The total estimated fee is $77,800.
If you are in agreement with this proposal, please sign where indicated below and return one copy to me.
Please do not hesitate to contact me at 763-231-4845 with any questions.
Sincerely,
WSB & Associates, Inc.
Bill Alms, PE
Water Resource Project Manager
Attachment
Cc: Monica Heil, WSB & Associates, Inc.
Mitch Hatcher, W SB & Associates, Inc.
Andy Brotzler, WSB & Associates, Inc.
ACCEPTED BY:
City of Rosemount, MN
Name
Title
Signature ___________________________
Date
Scope of Engineering Services
March 27, 2018
Page 2
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SCOPE OF ENGINEERING SERVICES FOR
UPDATE OF THE
CITY’S COMPREHENSIVE SURFACE WATER MANAGEMENT PLAN AND
CITY-WIDE HYDRAULIC AND HYDROLOGIC MODEL
CITY OF ROSEMOUNT PUBLIC WORKS
ROSEMOUNT, MN
PROJECT BACKGROUND / UNDERSTANDING
WSB last updated the City of Rosemount’s Comprehensive Surface Water Management Plan (CSWMP) in
August 2007. As part of that update, the implementation strategies focused on developing a trunk sewer
overflow east toward the Mississippi River to provide outlets to land locked basins, flood prone areas, and
the majority of the city’s overall stormwater management system. In September 2013, the City requested
the Vermillion River Watershed Joint Powers Organization (VRWJPO) consider allowing the City of
Rosemount to direct stormwater overflows across its southern municipal border toward the Vermillion
River. In response, the VRWJPO and City commissioned an update to the VRWJPO XP-SWMM model to
add additional detail to more accurately determine what the existing discharges are within the City. Upon
completion of this model update, VRWJPO officially modified the intercommunity rate and volume
standards along Rosemount’s borders, primarily allowing additional discharges to the southeast into
Empire and Nininger Townships. The majority of the western half of the City remained landlocked.
This scope has been designed to update the City’s CSWMP to meet the requirements of the Metropolitan
Council, Minnesota Rules 8410, and Minnesota Statutes 103B.235, and satisfy requirements of the
VRWJPO. At the completion of this update, the City will have a strategy to achieve its goals for water
resource management through policies, standards, and an implementation program. The implementation
program will lay out and prioritize steps needed to further evaluate options for overflows from land locked
areas, among other issues.
In addition to completing the statutory requirements for the CSWMP update, WSB has included a task to
update the XP-SWMM model to a similar level of detail as the existing model, incorporating development
that has occurred since 2007 and the Atlas 14 rainfall events. This will allow the City to provide specific
information such as required discharge rate, volume, and outlet elevations necessary to provide adequate
flood protection to regulatory agencies and other stakeholders as the overflow discussion advances. The
updated model will also provide information that can be used to efficiently and accurately complete Atlas 14
risk assessments, flood reduction projects, development reviews, cost-benefit analyses, street
reconstruction projects, and other water resource-related projects.
SCOPE OF ENGINEERING SERVICES
Task 1 – Project Kick-off and Information Gathering
This task consists of gathering relevant water resources-related information for the City. WSB will prepare
for and attend a kickoff meeting with City staff and initiate communication with agencies in order to collect
new and additional background information beyond what is included in the city’s current plan. At the kick-
off meeting project schedule, deliverables, and the City’s expectations for the final plan will be confirmed.
Based on our knowledge of regulatory and climate changes that have occurred since the completion of
the 2007 Plan, WSB will identify in detail content that needs updating to address current and future
challenges. WSB will look for redundancies or conflicting information among all documents that are under
review as part of this task.
Scope of Engineering Services
March 27, 2018
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The water resource data collected as part of this task will be analyzed, interpreted, and summarized in
the updated plan. This will provide an indication of the present status and possible trends concerning
stormwater resources within the City, and will assist in the updating of stormwater management policies,
ordinances, and capital improvements. It will also serve as a water resource library for the City’s future
use and reference.
Task 2 – Review and Establish Goals and Policies
Based on the results of the previous task, the goals and policies for the management of water resources
in the City will be updated.
WSB will provide guidance on suggested goals, policies, and controls. Additional input from City staff,
Council, and other stakeholders will be solicited to form policies that make sound engineering and
planning sense, but also address the unique needs of the City of Rosemount. The stormwater
management goals and policies will address regulatory requirements including the need for
communication and coordination with regulatory agencies, approach to internal operation and
maintenance practices, regulation of new development and redevelopment, monitoring and reporting,
public education and outreach, and other issues.
WSB will provide direction to the City on the regulator y requirements of the goals and policies. We will
also document and present agency policies and associated impacts for consideration to be included in
the City’s plan. WSB will present updated written procedures that are streamlined and current.
Task 3 – Identify Problems and Corrective Actions
Water resource management problems identified as part of Tasks 1 and 2 will be outlined and corrective
actions will be developed for each problem. It is anticipated that problems may include, but are not
limited to, issues in the following areas:
• Lake, stream, and wetland water quality problems
• Flooding or rate control concerns in the City or between adjoining communities
• Impacts of stormwater management on recreational opportunities
• Impacts of stormwater managem ent on fish and wildlife resources
• Erosion and sediment control problem areas
• Impacts of land use practices on stormwater management
• Adequacy of the existing regulations to address stormwater management
• Adequacy of capital improvement programs to address stormwater management issues
• Adequacy of in-place policies to generate the revenue needed to pay for improvements
The problems identified will be addressed in this Plan. Concept level corrective actions for each problem
item will be developed, which in som e cases may include detailed recommendations. For more complex
issues, implementation items could be listed for further study in the coming years. These corrective
actions will be incorporated into the implementation plan.
Task 4 – Develop Implementation Plan
Through the Plan development process, a number of water resource studies, programs, and capital
improvements will be identified either through the goals and policies or through addressing problems with
corrective actions. These programs, studies, and capital improvements will be prioritized with City staff
and Council and developed into a clear implementation plan.
Scope of Engineering Services
March 27, 2018
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Necessary stormwater management activities will be outlined in an implementation plan and include but
are not limited to:
• Plan to further evaluate options for providing an outlet from land-locked areas of the City
• City ordinance revisions
• Capital improvements
• Inspection and maintenance programs
• Preparation of reports
• Need for annual meetings
• Educating or communicating with the public
• Training
• Need to complete additional water resource studies
For each activity, the implementation plan will generally provide a schedule, cost, and other pertinent
information so the City can budget, track progress, and staff appropriately. The implementation plan will
provide direction to the City for a ten-year planning horizon.
Task 5 – Prepare Draft Report
This task focuses on the direct preparation of the Plan document. The Plan will be formatted as one
comprehensive set of goals, policies, and implementation priorities combining the results from various
programmatic-based inventories and analyses as described in this work plan. The Plan document will
contain the following sections:
• Executive Summary: Generally, summarizes the content and purpose of the local plan.
• Land and Water Resource Inventory: Contains information that is relevant to the development
of this document.
• Agency Coordination: Contains information regarding other agencies and organization relevant
to the plan.
• Goals and Policies: States specific goals and corresponding policies relate d to the purpose of
the Plan that are consistent with the policies and goals of the regional, state, and federal goals
and programs that are currently in place.
• Assessment of Problems and Corrective Actions: Contains a summary assessment of
existing and/or potential water resource-related problems that affect the community along with
non-structural, programmatic, and/or structural solutions to the problems.
• Implementation Priorities: Prioritizes implementation components to make the best use of
available local funding and prevent future water management problems from occurring , to the
maximum practical extent.
• Financial Considerations: Contains an analysis of the financial impact of implementation of the
proposed regulatory controls and programs identified in the previous section.
• Amendment Procedures: Contains the year the plan shall extend to and establish the process
by which amendments may be made.
A preliminary draft of the Plan will be prepared and reviewed with City staff prior to submitting to the
watershed district and Metropolitan Council for review.
Task 6 – Submit to Agencies for Review and Incorporate Comments
This task includes submitting the draft CSWMP to VRWJPO and Metropolitan Council for review. The
Met Council has a 45-day review period that runs concurrently with the 60-day review period of the
watershed district. Comments provided will be discussed with City staff and incorporat ed into the
CSWMP.
Scope of Engineering Services
March 27, 2018
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Task 7 – Prepare Final Report
After their review, the final CSWMP will be prepared and submitted to the City Council for review and
approval. Upon final approval of the plan, two (2) printed copies and a PDF document of the Plan will be
made and provided to the City.
Task 8 – City-wide XP-SWMM Model Update
This task consists of updating the city-wide hydrologic and hydraulic model of the City’s stormwater
management system. The 2015 VRWJPO XP-SWMM Model contained 172 subwatershed divisions
within the City. Additional detail is needed in this model to accurately account for the existing storage that
is available in the City’s stormwater system. The attached figure shows approximately 200 additional
subwatershed divisions in red that are proposed with this modeling effort. This additional detail will allow a
more accurate assessment of flood protection requirements around each of the modeled basins.
WSB will incorporate subwatershed information from the City’s GIS information, development grading
plans, 2007 City-wide HydroCAD Model, and the 2016 VRWJPO XP-SWMM model. The City’s existing
storm sewer information will be reformatted in GIS to facilitate importing it directly into the hydrologic
model. Following a review of available storm sewer information, WSB will provide a list of the locations
where required data is missing to the City for review. If necessary, a field survey can be completed to
collect missing data and would be billed separately from this scope at the standard hourly rates.
WSB will update the VRWJPO XP-SWMM model for the entire City of Rosemount. The model will
incorporate existing land uses, storm sewer, channel cross sections, and detention storage data. The
model will be run using 2-year, 10-year, and 100-year, 24-hour Dakota County Atlas 14 Rainfall Depths
with MSE-3 distribution. This distribution is slightly different than the VRWJPO modeled storms, but is
more consistent with the City’s Stormwater Management Plan and Engineering Guidelines as well as
FEMA flood plain mapping procedures. A 10-day snow melt event will also be analyzed.
A memo will be prepared summarizing input parameters and results within the City of Rosemount. The
memo will also include:
• Summary of peak discharge rates, runoff volumes, and high-water levels for each modeled
basin.
• Areas under existing conditions with freeboard infringements.
• Estimated required discharge rates and volumes at established VRWJPO intercommunity
standard discharge locations to maintain necessary freeboard in current landlocked regional
basins.
A meeting with City staff will be scheduled to review the model results and address any comments.
SCHEDULE
The proposed schedule for this project is as follows:
Task 1 – Project Kick-off and Information Gathering ..................................................................... April 2018
Task 2 – Review and Establish Goals and Policies ............................................................. May to July 2018
Task 3 – Identify Problems and Corrective Actions ............................................................ June to July 2018
Task 4 – Develop Implementation Plan .......................................................................... July to August 2018
Task 5 – Prepare Draft Report .................................................................................................... August 2018
Task 6 – Submit to Agencies for Review ......................................................................... September 1, 2018
Task 7 – Finalize and Adopt Report ...................................................................................... December 2018
Task 8 – City Wide XP-SWMM Model Update.......................................................... April to November 2018
Scope of Engineering Services
March 27, 2018
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*The schedule above assumes that we will receive authorization to proceed with work outlined in this
scope by April 3, 2018.
ENGINEERING SERVICES FEE
The cost to provide the scope of services outlined in this proposal will be billed hourly, based on our
current hourly rates. We are proposing to complete the update to the City of Rosemount’s CSWMP and
city-wide hydraulic and hydrologic model for an estimated fee of $77,800.
Task Description Estimated Fee
Task 1-7 Update to CSWMP $28,950
Task 8 XP-SWMM Model Update $48,850
Total for Project $77,800