2015.03.24 CC Minutes - Laserfiche WebLink

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March 24, 2015 Park. He commented on the funding responsibility for the proposed improvements and noted the City would not be responsible for these costs. He noted that any park amenities that the City would like to add, such as paved trails or trail lighting would be the responsibility of the City. He reviewed his upcoming meeting schedule for Hansen Park and noted a Public Open House would be held this summer where the draft plans and landscape renderings would be reviewed. Public input would be taken at this time as well. He reported that construction was planned for late fall 2016 through the end of 2017. A map of the existing conditions at Hansen Park was provided and the amount of material that would be removed was discussed. He noted that a new dam structure would be constructed to lower the normal water level of the pond 2.3 feet. Further comment was provided on the outlet /dam bypass concept. He explained how the iron - enhanced sand filter would benefit the water quality of the pond. The project benefits for Hansen Park were categorized and noted an annual total of 148 to 194 pounds of phosphorus would be removed from the pond. He discussed the proposed memorandum of agreement with RCWD and requested the City grant easement access for the project. Councilmember Jacobsen ciuestioned the life expectancy of the iron - enhanced sand filter. Mr. Axle noted the sand filter would require yearly maintenance and he anticipated it would last approximately 30 years. Councilmember Burg thanked staff for the thorough presentation She asked if a maintenance and operations agreement would be drafted with the City. Mr. Axle stated the RCWD has yet to draft this agreu—nent, but would be doing so prior to beginning the project. This agreement would outline maintenance and restoration project costs of private property. Mayor Jacobsen asked how the pond size would be impacted. Mr. Axle noted the pond was nearly one acre and he believed that after the improvenients were complete, the cattail mat would be turned into open water. Councilmember Bauman thanked the consultants for their thorough report. She asked what type of water would be flowing through the bypass pipe from the sand box. Mr. Axle explained through the sediment retention only a small amount of phosphorus would flow through the pipe. He believed that the pond water quality would improve after the proposed improvements were complete. Councilmember Bauman inquired how often the 4-bay area would have to be dredged. Mr. Axle indicated this area would be monitored. He anticipated that the area would have to be dredged in 20 years. He discussed how the pond would be drawn down in order for the sediment material to be cleaned out He reported that bi- weekly water quality testing was conducted on both Pike Lake and Long Lake. Active monitoring would also be conducted on Hansen Pond. He advised that the efforts of this project would improve the water quality to waterways downstream. Mayor Jacobsen asked if any carp were pulled out of the Long Lake this winter. Mr. Axle did not believe that any carp were taken this winter, but an overall carp management assessment was a priority of the RCWD. Councilmember Straub appreciated the positive working relationship that the City had with the RCWD. He thanked Ken and Bridget for serving on the RCWD Board. He supported a boardwalk across the pond to the island. Councilmember Burg encouraged RCWD to attend the upcoming Town Hall meeting and to make a presentation on tills project. Ed Davies, homeowner on 13'" Avenue, supported the proposed project and understood there would be a lot of disruptions to his property. He recommended that the water level be further evaluated to see if the pond level could be reduced even further to get the surrounding homes out of the FEMA flood zone. He provided comment on the high price of flood insurance. Mr. Axle stated the hydrology model from RCWD would be available to the City and perhaps this would assist with the FEMA classifications. Motion by Councilmember Jacobsen, seconded by Councilmember Burg to authorize and approve a Resolution approving execution of a Memorandum of Agreement with the Rice Creek Watershed District regarding access, construction, operation and maintenance of the Hansen Park Project Component of the petitioned Basic Water Management Project, Rice Creek Watershed District Project 2013 -01. 5 Ayes, 0 Nays - Motion Carried Page 5 of 8