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a ntec CITY OF CENTERVILLE -2018 LOCAL WATER PLAN 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 roughly $230,000. On October 9th' 2013, the City passed Resolution #13-022 which authorizes the City to participate in resolving public drainage problems. The City participates in the cost of drainage facilities by sharing in 25% of the cost of the project to be paid from the Stormwater Fund, provided the property owners agree to voluntarily be assessed for the remaining 75% of the cost. Thus, the City would pay $57,500 towards these listed backyard drainage issues. 2. LaMotte Stormwater Reuse System Expansion: The current stormwater reuse system will be expanded to include additional area in LaMotte Park, as well as Hidden Spring Park. Three additional spray heads ($75,000 total) will need to be added to LaMotte Park. A full traditional irrigation system will need to be added to Hidden Spring Park ($120,000). 3. LaMotte Stormwater Reuse System Upgrades: Given the recent regulatory scrutiny of stormwater irrigation in the State of Minnesota, the City may be forced to add advanced filtration and/or a UV disinfection system to the stormwater irrigation system in LaMotte Park. UV disinfection would help eliminate microbiological contamination; water is run through a watertight chamber containing UV light which produces a lethal dose of UV light to microorganisms. It is estimated that advanced filtration would cost $150,000, while UV disinfection would cost$100,000. In addition to the specific items presented above, the City the will look for ways to partner with RCWD to address erosion control issues in Centerville Lake, Clearwater Creek and Judicial Ditch 3 (JD-3). 8.4 ONGOING STORMWATER MAINTENANCE ITEMS 1. Stormwater Pond and Rain Garden Dredging: Like other cities in the Twin Cities Metropolitan area, the City of Centerville has many public stormwater ponds and rain gardens, 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, as do raingardens, 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 33 128