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ENVIRONMENTAL BOARD <br /> AGENDA ITEM 6A <br /> STAFF ORIGINATOR: Andy Nelson, Environmental Coordinator <br /> Matt Kocian, Lake and Stream Manager with Rice Creek <br /> Watershed District <br /> MEETING DATE: January 31", 2024 <br /> REQUEST: Recommendation to City Council <br /> TOPIC: Centerville Lake Alum Treatment <br /> INTRODUCTION <br /> Rice Creek Watershed District(RCWD) has been awarded grant funding to be used for <br /> improving water quality in Centerville Lake. The majority of these funds will be used for alum <br /> treatments that will address internal phosphorous loading that has been responsible for algae <br /> blooms and other water quality issues. <br /> Matt Kocian, Lake and Stream Manager with RCWD, will be present to discuss the project and <br /> answer questions from the Board. <br /> BACKGROUND <br /> Centerville Lake is an approximately 474 acre lake that has shoreland in Lino Lakes, Centerville, <br /> and Rice Creek Chain of Lakes Park. The lake was added to the Minnesota Pollution Control <br /> Agency's impaired waters list in 2002 due to high levels of phosphorous and chlorophyll-a. <br /> While this lake is used for boating, fishing, and swimming, recent water quality issues have been <br /> impacting these uses. One symptom of the poor water quality has been blooms of toxic blue- <br /> green algae fueled by high levels of phosphorous. Through a series of diagnostic studies, the <br /> RCWD determined that internal phosphorus loading(i.e. recycling) from lake sediments was a <br /> major driver of the algae blooms. <br /> RCWD has been awarded grant funding in the amount of$954,500 from the Clean Water Fund <br /> to address water quality issues in the lake. The Clean Water Fund is used to protect, enhance, <br /> and restore water quality in lakes, rivers, and streams, and to protect groundwater from <br /> degradation. The majority of the grant amount will be used for an aluminum sulfate ("alum") <br /> treatment to address internal phosphorous loading. Alum is a commonly used tool for managing <br /> internal phosphorus loading, and has been successfully used on many lakes in Minnesota and <br /> across the country. Additional funds may be used for monitoring, engineering, and potentially <br /> reestablishing some native species in the lake. The alum treatments could begin as early as <br /> spring 2024. <br /> 1 <br />