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MOLlrmViEw Item No: 6B Meeting Date: March 11, 2024 City of Mounds View Staff Report To: Honorable Mayor and City Council From: Don Peterson, Director of Public Works/Parks and Recreation Item Title/Subject: Storm Water Update; Silver View Park Storm Water Background/Discussion: The Public Works Department has many responsibilities and one is to efficiently operate and manage the storm water system. The system was first constructed in the 1970's and as with other similar core functions, research, innovation and best management practices have changed over the years. Below is an overview of the Silver View Storm Water Pond project- provided by Dan Edgerton of Stantec Services: Silver View Strom Water Pond: Data collection In -pond veg surveys are done Sediment coring is done. Sediment needs to be hauled to landfill. Water quality sampling is done Upland vegetation summary memo was completed and reviewed with Don Peterson Wetland delineation field work was completed. Report expected shortly so TEP can get out and review. Field survey is scheduled to be completed in the next couple of weeks, with a focus on potential BMP locations Public engagement Mtg #1 was held on Thursday, 9121, 5 pm. Meeting summary was submitted to Don Mtg #2 to be held after preliminary plans and concepts complete Take the recommendations to the Park Commission early 2024, before going to the City Council Have the second public meeting at a City Council meeting, early 2024 Permitting Wetland permitting will be prepared as needed, subject to BMP selection Alum treatment submittal (if needed) will be prepared and submitted to MPCA Water quality assessment and watershed analysis o Based on public meeting comments, will review existing and proposed HWL in ponds relative to adjacent properties Preliminary analysis of water quality and sediment data and pond modeling have been performed, indicating majority of phosphorus loading is from the watershed and not internal loading Aquatic plant data has been assessed, showing primarily coontail and water lilies. Based on this result, we may not be allowed to remove the water lilies or coontail, as they are not non-native. We will follow up with the MnDNR on this, after which we will discuss with Don Peterson. P8 modeling has been performed Technical memo still needs to be prepared. It will cover. Data collection, analysis and modeling, results and recommendations