Rosland Park Stormwater Filtration BMP Project
Lake Cornelia (Edina), listed as impaired on the MPCA's impaired waters list, has experienced documented toxic blue-green algae blooms in recent years. NMCWD completed a study in 2019 identifying internal and external nutrient loads to the lake and potential projects to reduce those loads to work toward meeting state nutrient standards and reduce the frequency of algal blooms. Following the NMCWD managers accepting the study, they directed staff to prepare a feasibility study on the identified projects. To date, the City of Edina has conducted annual herbicide treatments to address curly-leaf pondweed and the District has completed an in-lake alum treatment and is currently assessing goldfish and carp management options to address internal loads.
The proposed project is a stormwater filtration BMP on city property (Rosland Park) to remove phosphorus from runoff before it reaches Lake Cornelia. This project will address external loads (comprising up to 76% of the phosphorus load to the lake) coming from a 410-acre urban subwatershed that drains to the lake (including Southdale Mall).
The stormwater BMP will pump water from an existing pond (which outlets to Lake Cornelia) through an above ground filtration system, after which the treated water will be discharged to Lake Cornelia.
The stormwater BMP will include three different ?vaults? where different innovative filtration media will be used to determine which media results in the best removal efficiency.
Cumulative phosphorus removal over the 30-year life expectancy of the estimated $744,000 project is roughly 660 pounds (22 pounds annually), an estimated annualized cost per pound of removal of $2,200 (including annual maintenance).
A link to a You Tube recording of the presentation on the project given at the July 15, 2020 public hearing on the project can be found here: https://www.ninemilecreek.org/whats-happening/current-projects/lake-cor…
Annie Felix-Gerth
(b) $16,000,000 the first year and $16,000,000 the second year are for grants to local government units to protect and restore surface water and drinking water; to keep water on the land; to protect, enhance, and restore water quality in lakes, rivers, and streams; and to protect groundwater and drinking water, including feedlot water quality and subsurface sewage treatment system projects and stream bank, stream channel, shoreline restoration, and ravine stabilization projects. The projects must use practices demonstrated to be effective, be of long-lasting public benefit, include a match, and be consistent with total maximum daily load (TMDL) implementation plans, watershed restoration and protection strategies (WRAPS), or local water management plans or their equivalents. A portion of this money may be used to seek administrative efficiencies through shared resources by multiple local governmental units. Up to 20 percent of this appropriation is available for land-treatment projects and practices that benefit drinking water.
The cumulative phosphorus removal over the 30-year life expectancy of the project is roughly 660 pounds (22 pounds annually, on average), an estimated annualized cost per pound of removal of $2,200 (including annual maintenance).
Grant funds funded this project that reduced 22.00 Lbs/Yr of Phosphorus (Est. Reduction).
LOCAL LEVERAGED FUNDS