08-22-2022 City Council Packet - Laserfiche WebLink

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EXAMPLE AWARD NOMINATION I WEST WATER TREATMENT PLANT CHANHASSEN WATER TREATMENT PLANT DEVELOPMENT v Chanhassen is a growing Twin Cities suburb that is focused on advancing its development. In 2006, Chanhassen opened its first water treatment plant, which removed iron and manganese. Located on the eastern edge of the city, the plant served the low pressure zone, which wrapped around the higher portions of Chanhassen; leaving an enclave on the west side that did not receive treated water. Within this area, the City owned land and had plans to build a second water treatment plant. Prior to planning, the surrounding area was filling in with large residential homes and homeowners who became concerned a below grade clearwell, filter backwash tanks, and backwash claim system that recycles over 95 percent of the filter backwash wastewater. After detention, the water splits before reaching the filters, featuring two banks of three anthracite greensand filters. Both the east and west plants pump into the low-pressure zone, the main zone in the city. The west plant serves the higher areas of the city and was designed intentionally oversized to support future growth in the community. about a utilitarian facility in their neighborhood. A stormwater reuse system allows the City to recycle The City and WSB, moved forward with plans for a stormwater on site for irrigation and landscaping new water treatment plant while also meeting with around the plant and adjacent boulevard along Lake representatives of the homeowner's association in Harrison Road. Utilizing non -treated water for irrigation the Lake Harrison neighborhood. Eventually, the will save the City millions of gallons of treated water community settled on a prairie-themed design for the and chemical costs per year. plant building and adjacent land. The facility was built into a hillside, which required a great deal of earth moving. The new water treatment plant provides a pleasing aesthetic for residents, while keeping less attractive elements of the facility hidden from view. The plant has a treatment capacity of 9 million gallons - per -day and was specifically designed to treat the natural iron, manganese, and ammonia levels that exist in the City's aquifer. Based on pilot plant testing and initial observations, the plant was designed with pressure aeration, detention, concrete gravity filters, A Proposal for Design, Bidding, and Construction Administration for a Water Treatment Plant for City of Lino Lakes Appendix 144