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Stantec CITY OF CENTERVILLE -2018 LOCAL WATER PLAN CAPITAL IMPROVEMENTS PLAN The total footage of drain tile that would have to be added to complete the improvements listed above is 4200 ft. The City has completed previous drain tile projects consisting of trenching an 18" wide and 18" deep trough by installing river rock with tile surrounded by fabric and covered with 4" thick of pea rock on top. In 2009, this cost $50/ft. Costs to complete these improvements today would depend upon the location, length of run, elevation, and tree roots/other obstacles. Accounting for inflation and assuming a cost of$50/ft would mean these improvements would cost the City roughly $230,000. 2. Stormwater Pond Dredging: Like other cities in the Twin Cities Metropolitan area, the City of Centerville has many public stormwater ponds, which may need to be dredged. Dredging will likely be the most financially cumbersome capital improvement for the City, and prudent financial planning to accommodate this need is important. There is some guidance provided by Don Berger, of the MPCA Municipal Division, entitled Cost Estimates for Minnesota Stormwater Collection Systems. Stormwater ponds need to be dredged frequently to maintain their efficiency. Dredging will get rid of solid and semisolid wastes, including soil loss from open areas, 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. 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 dredging, and to develop a plan moving forward. 8.31 69