IV.10. Approve Storm Water Management Credit Transfer – Oxford Village; Stanley (CR2017-034)
February 21, 2017 Council Report 2017-034
APPROVE STORM WATER MANAGEMENT CREDIT TRANSFER
OXFORD VILLAGE
Proposed Action
Staff recommends approval of the following motion: adopt Resolution 2017-016, Approving
transfer of credit for storm water management from the Cottageville Park storm water
management system.
Overview
The City of Hopkins worked with the Minnehaha Creek Watershed District (MCWD) to
expand and revitalize Cottageville Park. As part of the effort, an underground storm water
treatment system was constructed in the park to capture runoff that previously flowed to
Minnehaha Creek untreated. As a result of the project storm water benefit credits for rate,
volume, and phosphorus control were assigned to the City of Hopkins; these credits can be
used to satisfy MCWD permitting requirements for future projects, both public and private.
City staff has worked with MCWD to develop a system for banking and distributing the
credits, the process is outlined in the attached overview document.
It has been determined that the reconstruction of Blake Road and other local area streets will
not trigger storm water management permitting rules, and it was brought to the City’s
attention that the Oxford Village project was having problems meeting MCWD permitting
requirements. At the request of the developer, the City agreed to transfer the credits needed
to Oxford Village so the permitting requirements could be satisfied. City staff required
compensation for the credits to recoup construction costs of the regional treatment system.
Supporting Documents
Overview – Storm Water Credit Transfer Process
Resolution 2017-016
_______________________________________
Nate Stanley, P.E.
City Engineer
Financial Impact: Budgeted Y/N Source: Related Documents
(CIP, ERP, etc.):
Notes: __________________________________________________________________
City of Hopkins
Overview – Storm Water Credit
Transfer Process
Cottageville Park Regional Storm Water Management System
The City of Hopkins has collaboratively worked with the Minnehaha Creek
Watershed District (MCWD) to expand and revitalize Cottageville Park over the last
few years. As part of the effort, an underground storm water treatment system was
constructed in the park to capture storm water that previously flowed to Minnehaha
Creek untreated. As a result of the project, a storm water benefit credits for Rate,
Volume, and Phosphorus control were assigned to the City of Hopkins.
The benefit assigned to the City is explained in a Technical Memorandum prepared
by Wenck Associates, dated July 7, 2016 which calculates the stormwater treatment
credits that the City can use to meet permitting requirements on future
improvements. Table 1 provides the Rate Control credit available from the system,
Table 2 provides the Abstraction Volume credit available from the system, and
Table 3 provides the Phosphorus Removal credit available from the system. The
catchment areas within which development that can utilize the system’s treatment
capacity are delineated in Figure 1 of the document. The document is attached to this
memorandum and shall serve as a reference in regards to credit calculation.
The City can either apply available credits to public improvement projects or
transfer the credits to private parties to facilitate redevelopment. In either case the
City and MCWD need to have a system in place to track credit usage to keep tabs on
the total amount of credits available, knowing where and what credits have been
applied to, and provide documentation of usage to meet MCWD permitting
requirements.
To officially transfer credits the City Council will need to approve by resolution. A
copy of the resolution specifying the amount of credits and details of what they are
being used for will be furnished to the MCWD to serve as an official record of the
transfer. The City and MCWD will keep a file to track credit usage and any
1
remaining balance for a specific storm water benefit credit held by the City. The
City will provide an annual accounting of treatment capacity utilized by projects or
land-disturbing activities within the catchment area of the treatment system.
Compensation for transfer of storm water treatment credits between the City and a
private party will be negotiated between said parties.
The underground storm water treatment system will be maintained by the City of
Hopkins in accordance with the attached Operations, Maintenance, and Monitoring
Recommendations included as part of the Cooperative Agreement for the
Cottageville Park Stormwater Management and Park Improvement Project between
the City and MCWD. As a part of this Agreement, the MCWD will provide the
easement necessary for the City to perform this maintenance.
2
CITY OF HOPKINS
HENNEPIN COUNTY, MINNESOTA
RESOLUTION NO. 2017-016
RESOLUTION APPROVING TRANSFER OF CREDIT
FOR STORM WATER MANAGEMENT FROM THE
COTTAGEVILLE PARK STORM WATER MANAGEMENT SYSTEM
WHEREAS
the City of Hopkins (City) and Minnehaha Creek Watershed District
,
(District) partnered to construct an underground storm water treatment system in Cottageville
Park, and
WHEREAS
construction of the system created a storm water abstraction benefit credit
,
for each party that can be used or transferred to other parties to satisfy District storm water
permitting requirements, and
WHEREAS
a Technical Memorandum prepared by the District engineer, Wenck
,
Associates, Incorporated dated July 7, 2016 calculates the total storm water rate control, volume
control, and phosphorus removal benefit for the City and the District, and
WHEREAS
the City has negotiated with Project For Pride in Living, LLC (PPL) to
,
transfer 2,679 cubic feet of storm water abstraction credits and 0.25, 0.27, and 0.26 CFS rate
control credits for the 1-, 10-, and 100- Year storm events respectively for their use to satisfy
District storm water permitting requirements for the Oxford Village project, and
WHEREAS
as compensation for the storm water management credits PPL will pay the
,
City $66,841.05,
NOW, THEREFORE, BE IT RESOLVED
by the City Council of the City of Hopkins,
Minnesota:
The Mayor and City Manager are hereby authorized to approve the transfer of storm water
abstraction credits owned by the City to PPL.
st
Adopted by the City Council of the City of Hopkins, Minnesota, this 21 day of February, 2017.
By_______________________________
Molly Cummings, Mayor
ATTEST:
_________________________________
Amy Domeier, City Clerk