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ARDEN HILLS SPECIAL CITY COUNCIL WORK SESSION — JUNE 23, 2025 11 southeast corner of the project where some slope stabilization was completed. They will implement a stormwater pond that would capture and treat water before it outlets to the lake. There are select trail rehabilitation areas, potential sediment removal at Karth Lake and will give some options for Karth Lake pump system improvements. Fisher shared a graphic showing the north project area. He noted where the orange color indicates a residential mill and overlay and the yellow on the graphic showed where streets will receive a reclamation and overlay. He noted the blue graphics indicate where the potential proposed sediment removal locations in Karth Lake. The south project area graphic shows reclamation and overlay of the road as well as some trail location that have deteriorated pavement and will fill fortify accessibility for maintenance staff. Some areas near the tennis courts will be improved knowing construction equipment will need to get to the location of those improvements. The cross walk on the cul-de-sac at Cummings Park Drive currently goes across the entire cul-de-sac. During final design he will evaluate potentially moving that to the east toward the water tower, to make the crossing shorter and more visible. He pointed out the final area identified for sediment removal and the location to implement the storm water pond. Councilmember Holden asked if the sediment removal location is a storm water pond. Fisher said that is part of the lake. Councilmember Holden asked if there is a culvert there. Public Works Director/City Engineer Swearingen said the water level is typically higher than what the graphic shows. Fisher wanted to give an overview on the processes they will be performing. He said a mill and overlay is a process where you grind out the top two inches of pavement, leaving the bottom layer. You would do any corrections needed and then repave. With the exception of the spot curb replacements, the curb will remain in place and the existing grades would remain the same. Reclamation and overlay is a similar process but that is prescribed when the pavement is a little more deteriorated and the base pavement isn't in good condition. A similar machine is used but it pulverizes and grinds up the existing pavement and mixes it with the underlying gravel. This creates a new aggregate base for the new road. Then you pave two lifts of two inches each, for a total of four inches of new pavement. Fisher discussed the storm sewer and water quality improvements. Staff has done a preliminary investigation into existing utilities and provided some specific locations where there are some structure replacements and minor rehabilitation needs. There will be some rip rap work at some of the outlets will mitigate erosion. Drainage structure sumps and SAFL Baffles are proposed to be installed at locations that don't have existing pre-treatment devices, prior to out letting into the lake. There is only one location that doesn't have one and there is one that is in poor condition that they would replace. They performed a risk assessment on some of the submerged culvert aprons. A number of the culverts that outlet to the lake were installed at lake levels at the time and are partially or completely submerged. The risk assessment identified the risk of leaving them there without bringing them up to the water level. They determined right now there are no issues. The potential issues exist during the freeze/thaw action in the winter. When the lake ices over, it can move those culvert apron ends to the point where they could fall off, if not properly secured. There is also a minor risk of potential flooding upstream where it would outlet out of the next