Collection System Master Planning and Improvements Client: City of Willmar Location: Willmar, Minnesota Donohue & Associates was retained by the City of Willmar to provide planning, design, and program management services for a new 7.5 mgd average-day wastewater treatment facility and associated collection system improvements. The service area covers approximately 5,500 acres and serves a resident population of nearly 20,000. The new plant was built 5.5 miles to the west of the existing plant. The prior collection system included 93 miles of pipe, 1,700 manholes, and 25 lift stations. Major portions of the sewers and numerous lift stations were approaching capacity limits. Donohue’ conducted a collection system analysis and developed a Comprehensive Sanitary Sewer Master Plan to address th

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