2018-02-28 CC Packet - Laserfiche WebLink

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( Stantec CITY OF CENTERVILLE -2018 LOCAL WATER PLAN CAPITAL IMPROVEMENTS PLAN litter, sand, leaf litter, construction sediments, and asphalt grit. Costs and dredging estimates are based on 2010 data, to manage Level 3 contaminated stormwater sediment (the most contaminated sediment) for disposal. Sediment would be disposed of at municipal solid waste landfills (MSW) facilities. Costs of dredging will vary, but several cities have sought to estimate their costs. The City of Minnetonka worked with Barr Engineering to develop a dredging cost equation. The equation does not include landfill disposal costs: Dredge Cost [2009 Dollars] = 78,515 x Volume 0.6727[AF] The above estimate uses 2009 dollars, so will need to be converted to present day dollars to account for inflation. The estimate of cost for dredging is roughly $50/cubic yard. From an additional study for the City of Centerville conducted by Stantec in 2018, it was determined that there are roughly 35 acres of public ponds and almost one acre of rain gardens throughout the City. Even though this estimation provides a framework to understanding potential costs associated with dredging, exact costs are extremely difficult to predict. Costs will vary on aspects such as the amount of sediment that is classified as Level 3 (most contaminated), and the expense of treating at a MSW facility. Thus, it is difficult to predict how much dredging will cost. As a current member of the Minnesota Cities Stormwater Coalition (MCSC), the City will work closely with MCSC to determine appropriate measures for addressing stormwater pond and rain garden dredging, and to develop a plan moving forward. 2. Local Water Plan Updates: The City of Centerville should be prepared to update its Local Water Plan every ten years, and when necessary, make updates to goals and policies throughout the Plan. 8.32 84