HomeMy WebLinkAbout2018-08-16 PC Packet Enclosure - 06-28-18 City Engineer Memo enctauku
Stantec Memo
To: City of Oak Park Heights,Planning From: Lee Mann,P.E.
Commission City Engineer
File: 193801828 Date: June 28,2018
Reference: City Utility Comprehensive Plans
This memo provides a summary of the purpose and use of the City's comprehensive utility plans.
Comprehensive utility plans are currently in place for the City's Water,Sanitary Sewer and Storm
Sewer systems.As they are a part of the City's overall Comprehensive Plan,they have also been
updated at this time. In general,these plans provide a tool for the City to plan and operate these
systems,now and for the future.
These plans identify the capacities of the existing systems,and improvements or additions needed in
the future,as the City adds development and/or population. In other words,sizes and capacities of
existing water mains,water supply wells,water reservoirs,sanitary sewer pipes,lift stations,storm
sewer pipes,storm water ponds etc.are confirmed. Future facilities and sizing are planned based
on the growth anticipated in the City's overall Comprehensive Plan.
Water System Master Plan
The City of Oak Park Heights has completed an updated comprehensive water system study. The
Water System Master Plan is the culmination of existing system evaluations and future planning,
based on the 2040 land use plan provided in the City Comprehensive Plan. The Master Plan project
was conducted to develop an updated hydraulic model of the distribution system to evaluate
existing system capacity and identify a complete improvement plan to meet future water system
needs. The model confirms the ability of the City's water system to supply the necessary flow now
and in the future,as the system is expanded.
In addition,all public water suppliers in Minnesota must have a Water Supply Plan(WSP)approved
by the Department of Natural Resources(DNR).The Oak Park Heights WSP was approved February
2018 and is attached to the 2018 Comprehensive Plan as an appendix. The WSP addresses the
following items:
• A description and evaluation of the City's water supply system,
• Emergency preparedness procedures;and
• A water conservation plan
Completing a WSP that receives DNR approval fulfills a water supplier's statutory obligations under
M.S.13G.291.For water suppliers in the metropolitan area,the WSP will help local governmental units
fulfill their requirements under M.S.473.859.
Sanitary Sewer
The Oak Park Heights Comprehensive Sewer Plan(CSP)updates previous sewer planning efforts and
describes in detail the City's current sanitary sewer system.The report has been based on the land
use and population data provided in Oak Park Heights'Comprehensive Plan Update.The City's
Design with community In Mrd
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4 Stantec
June 28,2018
City of Oak Park Heights, Planning Commission
Page 2 of 2
Reference: City Utility Comprehensive Plans
current trunk sewer system serves the entire City. The existing system is in good condition.Sewer
modeling was performed to evaluate the system for the City's ultimate conditions.The modeling
shows no major capacity issues in the City's existing sewer system. No major sewer upgrades are
being proposed within the City as part of the CSP.
Under state law, local governments are required to submit a comprehensive sewer plan describing
the service needs from the regional system, owned and operated by the Metropolitan Council
Environmental Services (MCES).The plans must be consistent with the 2040 Water Resources Policy
Plan provided by the MCES in the event a sewer extension or connection needs to be added that
could impact the regional system.The CSP report has been prepared in accordance with the
Metropolitan Council's guidelines for local Comprehensive Sewer Plans.
Storm Water
The Local Surface Water Management Plan (LSWMP) serves as a comprehensive planning
document to guide the City of Oak Park Heights in conserving, protecting, and managing its surface
water resources.The main issues to be managed include rate control,water quality, volume control,
wetland management, and management of floodplains and shorelands. All new development and
redevelopment have to address these issues to some degree. In addition,some existing storm water
issues are identified for the City to address if/when funding and logistics allow.
Rate control includes managing the runoff during storm events to discharge the flow over a longer
period of time in order to minimize downstream flooding. Rate control is typically accomplished by
routing runoff through ponding areas that hold water and then release the water slowly.
Water quality improvement of stormwater runoff is accomplished through various methods,
including ponding, vegetated swales or ditches, and infiltration/filtration basins. These methods
remove a percentage of the pollutants including phosphorus,sediments and other undesirable
substances.
A more recent issue for stormwater management is volume control. In areas where habitat or
downstream characteristics are sensitive to additional water created by impervious surfaces from
development or redevelopment, reducing the volume of the runoff may be a requirement. Volume
control is accomplished through infiltration basins, water re-use systems (typically for irrigation) or
routing the runoff to plants or trees that in turn utilize the water and discharge excess water to the
atmosphere (evapotranspiration)
The Plan meets the requirements detailed in Minnesota Statutes 103B and Minnesota Rules 8410,
administered by the Minnesota Board of Water and Soil Resources,which addresses surface water
planning and project implementation. The LSWMP is also consistent with the goals and policies of
the Metropolitan Council's Water Resources Management Policy Plan (which is intended to help
ensure the coordinated, orderly and economic development of the seven-county Twin Cities
metropolitan area), and the three watershed management organizations having jurisdiction within
the City: the Brown's Creek Watershed District (BCWD), the Middle St.Croix Watershed
Management Organization (MSCWMO), and the Valley Branch Watershed District (VBWD).
Design with community in mind
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