03/30/2016 Environmental Board Minutes

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Evironmental Board March 30, 2016 Page 3 B. Mattamy Storm Water Reuse and Irrigation System Erin Heydinger, water engineer from WSB & Associates, presented the overview of three options for Stormwater reuse in the proposed Mattamy development. The board was first presented the feasibility study was at the January 2016 meeting. Why water reuse — water conservation, White Bear Lake settlement —reducing water usage by 17% and storm water maintenance. There was a water balance study using 50 years of rainfall data making sure the lake in the development would be sufficient for water reuse project." The options were: 1. Reusing Stormwater to irrigate public places 2. Reusing Stormwater to irrigate public places and the townhome 3. Reusing storm water to irrigate the entire development The City would own the system and would be involved in maintaining of the pumps The recommendation based o ` he water balance and cost analysis is option 2. This is watering of the townhome the park and the berm. Some grant funding maybe available through RCWS and the Metropolitan Council they do have some funds for storm water reusing projects. There was discussion and concerns on: • Depth of the pond • Size of the berm and plantings on the berm • Greenway plantings • How would the system be controlled for option 2 • Association agreement of when to water and winterization of the system • Size of sprinkler heads • Health concerns with reuse storm water • Aeration of the lake • Pump filters being used to take out sediments, sensor for chloride • Stormwater fees will be charged to residents of development for irrigation Number of units — 840 • Signage around the lake notifying residents of water quality • Grass buffers around lake • The water level of a drawdown of the lake • More information of hybrid system Mr. Schwartz made a motion to pass this on to the council in favor of option 3. But we need more numbers to see how much water would be needed for option 3. APPROVED MINUTES