Project Location:

Cottage Grove, Minnesota

Owner:

Metropolitan Council of Environmental Services (MCES)

Synopsis of Work:

This project consisted of construction and upgrade of a wastewater treatment facility at the Cottage Grove WWTP site. The new facility has a capacity of 10 million gallons per day with space reserved for a future capacity increase of additional 10-mgd and additional effluent requirements. The area is located on the Mississippi River bluff and is considered an environmentally sensitive area, therefore the discharge line required a shored drop shaft and horizontal tunneling. Because the site was so small and work is performed near and around the existing plant, scheduling and cooperation of the contractors on the site was of the utmost importance. The new influent interceptor line consists of a 66"-dia. reinforced concrete pipe with T-Lok lining. Total excavation included 150,000 cubic yards.

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