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Burandt Lake TMDL


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The TMDL, Implementation Plan, fact sheets and more can be found on the Minnesota Pollution Control Agency's website. Visit here for detailed information on the TMDL Burandt Lake TMDL available at MPCA's website. 

IMPLEMENTATION

 

AQUATIC PLANT SURVEY RESULTS

Two aquatic plant assessments of Burandt Lake were conducted by Blue Water Science on June 11 and August 30th, 2012. The methodology used included stem density determinations and plant assessments. The results indicated coontail and Eurasian watermilfoil were the most abundant plants in the lake both years. The study also looked at the long term potential growth for the invasive species, Curlyleaf Pondweed and Eurasian Water Milfoil. The sampling results indicate that most of the lake has the potential to support light to moderate growth of Curlyleaf pondweed and Eurasian Watermilfoil. View full study report.

ALUM TREATMENT

Burandt Lake received and ALUM treatment in June 2011. ALUM (aluminum sulfate) is a nontoxic material commonly used in water treatment plants to clarify drinking water. In lakes, ALUM is used to reduce the amount of internal phosphorus in the water, thus improving water clarity and reducing algae blooms.  When in water, ALUM forms a fluffy hydroxide precipitate (principle ingredient in common antacids like Maalox) called “floc” which binds to phosphate and forms a compound that’s insoluble in water, thus removing phosphorus from the water.  The floc then settles to the lake bottom forming a barrier by combining with the phosphorus being release from the lake bed.  The floc disappears over time, but phosphorus remains locked up in the soil or used by plants. One of the many benefits ALUM provides is the ability for native plants to be reestablished in the lake, thus improving water clarity, fish habitat, and reducing invasive weeds. A public meeting was held in May 2011 to inform homeowners about the project.

As part of the ALUM study, Steve McComas from Blue Waters Science conducted plant surveys and soil surveys to see how the lake was reacting to the ALUM treatment and to determine the risk of increasing population of aquatic invasive plants. A public meeting was held in March 2012 to present the findings of these studies. See Steve McComas's presentation on the study's results here. ALUM STUDY RESULTS.

another view of the sweetwater boat

A view of the Sweetwater boat during the ALUM treatment.

RAINGARDENS

In the summer of 2009, Carver County WMO worked with 4 homeowners on Lake Burandt to install rain gardens. These rain gardens capture storm water runoff (a major contributor to water pollution), and filter the storm water before allowing it to reach Lake Burandt. The summer of 2011, 6 additional raingardens were added in another development around Lake Burandt.

 

Public Process: 

A public meeting was held on February 7th, 2008 at the Waconia City Hall.  Presentations were given by MPCA,  Carver County Water Management, and the Association of Metropolitan Soil and Water Conservation District staff.  Presentations covered the TMDL process, ecology and water quality of Burandt Lake and urban conservation practices. Power point presentations are presented below.

TMDL Process

Burandt TMDL Overview

Urban Conservation Practices

In response to the interest of the landowners as indicated at the Burandt Lake TMDL meeting, an aquatic plant workshop was held at the Waconia City Hall on April 1st, 2008.  Experts from the U of M Extension Service and the Minnesota DNR presented material focusing on the management of aquatic invasive species (AIS) such as curlyleaf pondweed (CLPW) and Eurasian watermilfoil (EWM).   

CLPW picture

Questions or comments regarding the Burandt Lake TMDL can be directed to  Tim Sundby at 952-361-1816 or tsundby@co.carver.mn.us.