Agenda - Public Works Committee - 10/20/2015

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would be a more natural occurrence. She stated the builder and the City should know what the probability of this happening is when they develop the property. Mr. Bergevin pointed out if the stormwater is going directly into the wetland without being filtered, and if the lake levels continue to be as high as they are, this is detrimental for the City, and for them. Councilmember Shryock noted the DNR signed off on the drainage easement when it was built, so this is within their parameters. She said the wetlands overflow all the time. She questioned if the City has the capability to change these parameters, or if the DNR should change them. She stated the rules are not designed to retrofit. The rules were the way they were at the time of building and the drainage easement is still technically performing according to the rules. She said there are too many questions at this point to commit to changing or constructing anything. City Engineer Westby agreed and added he did not know what storm event the swale was designed to handle but that drainage systems are designed to accommodate specific events such as the 100 -year event, not the largest events possible. He equated it to shopping at the holidays when the shopping center parking lot is full because is was not designed to handle that amount of parking for only a short time. Chairperson Riley stated the City takes this seriously and it is concerned. Though this has a somewhat easy answer, there are still issues. He noted it is a discussion that needed to happen. He suggested moving the item forward for more discussion and details. He asked what would make the projected cost go from $15,000 to $40,000. City Engineer Westby replied the size of the settling pond would make a difference. The required wetland credits would also play a role in determining the cost, as would other costs due to grading, turf restoration, and storm sewer adjustments. Consensus was reached to direct staff to calculate the size of pond needed, and the cost of wetland mitigation and bring this item back to this Committee for discussion. Councilmember Johns asked if this could be brought back this year. City Engineer Westby responded it will likely not be this year. 5.02: Consider Recommending City Council Approval of Master Partnership Contract with Minnesota Department of Transportation for TH47 Pedestrian Crossing Improvements City Engineer Westby reviewed the staff report. He noted the City Attorney had no major issues with the Master Partnership Contract. There are some grammatical issues and small issues but the changes would not affect the meaning at all. Councilmember Shryock asked whether this type of agreement is used in other cities. Public Works Committee / September 15, 2015 Page 6 of 9