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2018-01-24 CC Packet
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2018-01-24 CC Packet
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Stantec <br /> CITY OF CENTERVILLE -2018 LOCAL WATER PLAN <br /> CAPITAL IMPROVEMENTS PLAN <br /> The total footage of drain tile that would have to be added to complete the <br /> improvements listed above is 4200 ft. The City has completed previous drain tile <br /> projects consisting of trenching an 18" wide and 18" deep trough by installing river <br /> rock with tile surrounded by fabric and covered with 4" thick of pea rock on top. In <br /> 2009, this cost $50/ft. Costs to complete these improvements today would depend <br /> upon the location, length of run, elevation, and tree roots/other obstacles. Accounting <br /> for inflation and assuming a cost of$50/ft would mean these improvements would <br /> cost the City roughly $230,000. <br /> 2. Stormwater Pond Dredging: Like other cities in the Twin Cities Metropolitan area, the <br /> City of Centerville has many public stormwater ponds, which may need to be dredged. <br /> Dredging will likely be the most financially cumbersome capital improvement for the City, <br /> and prudent financial planning to accommodate this need is important. <br /> There is some guidance provided by Don Berger, of the MPCA Municipal Division, <br /> entitled Cost Estimates for Minnesota Stormwater Collection Systems. Stormwater <br /> ponds need to be dredged frequently to maintain their efficiency. Dredging will get rid of <br /> solid and semisolid wastes, including soil loss from open areas, litter, sand, leaf litter, <br /> construction sediments, and asphalt grit. Costs and dredging estimates are based on <br /> 2010 data, to manage Level 3 contaminated stormwater sediment (the most <br /> contaminated sediment) for disposal. Sediment would be disposed of at municipal solid <br /> waste landfills (MSW) facilities. <br /> Costs of dredging will vary, but several cities have sought to estimate their costs. The <br /> City of Minnetonka worked with Barr Engineering to develop a dredging cost equation. <br /> The equation does not include landfill disposal costs: <br /> Dredge Cost [2009 Dollars] = 78,515 x Volume 0.6727[AF] <br /> The above estimate uses 2009 dollars, so will need to be converted to present day <br /> dollars to account for inflation. The estimate of cost for dredging is roughly $50/cubic <br /> yard. <br /> Even though this estimation provides a framework to understanding potential costs <br /> associated with dredging, exact costs are extremely difficult to predict. Costs will vary on <br /> aspects such as the amount of sediment that is classified as Level 3 (most <br /> contaminated), and the expense of treating at a MSW facility. Thus, it is difficult to <br /> predict how much dredging will cost. As a current member of the Minnesota Cities <br /> Stormwater Coalition (MCSC), the City will work closely with MCSC to determine <br /> appropriate measures for addressing stormwater pond dredging, and to develop a plan <br /> moving forward. <br /> 8.31 <br /> 69 <br />
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