HomeMy WebLinkAbout 3.b Stormwater Management PlanMemorandum
To: Rosemount City Council
From: Bret A. Weiss, P. E.
Date: July 6, 2001
Re: Update on Storm Water Management Projects Within the City of Rosemount
WSB Project No. 1005 -33
The following is a list of stormwater projects currently underway within the City. The
sections that have been updated from the June 13 memo are noted:
1. Wensmann Pond Bank Stabilization Project
With the discharge of the Birger Pond outlet into this pond, Wensmann Pond has started
to erode around the banks. A Feasibility Study has been completed that identified four
bank stabilization alternatives that are available to reduce or eliminate the shoreline
erosion around this basin. These alternatives included revegetating areas along the
shoreline with water tolerant plants, placement of Class I rip rap, or beach sand, or
installation of an erosion control mat along the shoreline.
Based on a field walk and discussion with the residents around Wensmann Pond, the
residents requested that the City install the Class I rip rap around the shoreline. The cost
associated with this installation is estimated to range from $125,000 to $150,000. A
memorandum further describing the issues and considerations associated with this
project is available.
2. Hawkins Pond Lift Station - *Updated
Plans and specifications for this project were approved at the July 2 nd meeting and will
be awarded at the first meeting in August. The lift station will be operational by Spring
2002. All pipe work will be completed this year.
3. Marcotte Pond Lift Station and Forcemain - *Updated
A Feasibility Report for the Marcotte Pond Lift Station and Forcemain project has been
prepared and submitted to the Rosemount Utility Commission. Alternatives include the
installation of a lift station having a total capacity of 9 or 15 cfs. If a 9 cfs lift station is
utilized, up to 1 acre of additional easement will need to be acquired around Marcotte
Pond to accommodate the ultimate storage volume tributary to this pond. If a 15 cfs lift
station is utilized, up to .5 acres of additional easement will need to be acquired. The
anticipated high water elevation for a 9 cfs pump is estimated at 914.5 feet. If a 15 cfs
Pump is utilized, the anticipated 100 -year high water elevation is estimated at
approximately 911.2 feet. In both instances, the lift station will have 2 pumps, each