01-10-23 Agenda Packet - Laserfiche WebLink

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Lexington as an area that could be used to treat (via ponding and infiltration) the water to remove pollutants from the water run-off from the impervious surfaces in the adjacent businesses. Karth Lake BMP #5 addressed pavement retrofits to storm water runoff from those same surfaces. In December 11, 2019, in response to requests from KLIDB to address the BMP #1 site, Todd Blomstrom, Public Works Director, said the city planned to apply for a cost sharing grant on a new BMP #1-focused project from the Rice Creek Watershed District (RCWD). On January 15, 2020, Todd Blomstrom said the city had submitted a grant application to the RCWD. At the next meeting, January 12, 2021, (which didn’t happened until a year later because of COVID), Todd Blomstrom presented a nearly completed project plan for BMP #1 remediation, but there was no time at that meeting for the board to ask questions. At the February 9, 2021 meeting, David Swearingen, newly appointed as the Interim Public Works Direct, answered board questions regarding the project plan. To the question of whether there would be a mechanism to capture solids such as a grit chamber, he said that the plan would be amended to add a grit chamber. To the question of whether there would be a mechanism to filter out oil products and other polluting run-off from the pavement, he said no, but that he planned to apply for another grant in the future that would divert water into a holding pond so it is filtered before it empties into the lake. Accordingly, the Remediation of BMP #1 Site Plan completed in 2021 addressed BMP #5 from the 2009 Management Plan (street/sewer improvements to the run- off from business impervious surfaces) but not BMP #1, treatment of the water to remove pollutants. According to David, the 2021 project carries a greater volume of water into the lake than the previous system since the water is no longer absorbed by the hillside between the parking lot and the walking path. However, it avoids collecting silt from erosion of that hillside and also removes grit from the parking lot run-off in its grit chamber. Discussion: Regarding next steps to filter pollutants from the run-off, David Swearingen said that Arden Hills’ five year plan excludes any further work on BMP #1. Next steps, if any, would have to be addressed in subsequent planning periods. Kathy Johnson and Susan Johnson noted that there appears to be significant erosion between the path and the lake (“Downstream BMP #1”). Susan asked if fund raising could be done to address the Downstream BMP #1 area. David said