2016.08.15 CC Packet - Laserfiche WebLink

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EXHIBIT A Work Plan On June 24, 2016, the City of Hugo was notified that the Metropolitan Council awarded a $200,000 Stormwater Grant to the Rice Creek Watershed District (RCWD) for the design and construction of a stormwater reuse system at Water's Edge in Hugo. WSB & Associates, Inc. (WSB) will serve as the project engineer, coordinator, and manager on behalf the City, and will coordinate the project and funding through RCWD. The project will reduce and potentially eliminate the need for potable water for irrigation by connecting and expanding the existing irrigation system to a nearby stormwater pond. Task 1: Site Investigation Over the past year, WSB has completed a water balance model; total project cost and financing estimate; and preliminary site investigations to determine the feasibility of the project implementation. The following section provides a brief summary of these items that have completed under Task 1. The water balance model not only determined the quantity of water available from stormwater sources, but also the pond elevation in relation to the irrigation demand. The following parameters were used in the overall water balance model: • Pond drainage area • Storm sewer connections • Pond characteristics (i.e. depth, surface area, and volume) • Precipitation (historic data from 1959-2015) • Evaporation • Overflow • Irrigated area • Irrigation demand The normal water level of the pond is at a depth of 9 feet. It was determined that the pond will be allowed to drop to a depth of 7 feet, resulting in the pond edge receding a maximum of 9 feet. This protective pond level will provide a balance between minimizing potable water use with minimal impacts on the pond and surrounding properties. The total project costs and financing estimate was completed to determine the initial capital costs required for the project and also the long-term operations, maintenance, and replacement costs for the stormwater reuse system. The estimates were then used to identify options for financing the overall project. The total capital costs are estimated to be $522,000 which includes a 10% construction contingency and 25% indirect costs. On September 3, 2015, water quality tests were taken at the pond to be used for as an irrigation source. Water quality parameters evaluated include turbidity, total suspended solids, E. coli, pH, chloride, zinc, and copper. These parameters were determined based on MPCA recommendations for public health, vegetation health, and irrigation system function. The samples were sent to a fixed -based laboratory. Results are shown in the table below.