Two Rivers awards $127,019 contract to extend landfill leachate collection system

The Two Rivers City Council voted Feb. 17 to award a construction contract to Mammoth Construction LLC of Manitowoc to extend the leachate collection system at the city’s old landfill.

The low bid of $127,019.50 came from Mammoth Construction; the work will include installation of a new manhole/pump well, perforated leachate collection line and related erosion control and site work. The project had been budgeted at $200,000 in the 2024 capital program and carried into 2025.

City staff said the work responds to seepage and leachate that had become evident at a new seep area and follows a Department of Natural Resources notice requiring corrective measures. Matt Heckenleible (staff member) explained bid-unit terminology to council and said six bids were received: “l s means lump sum… l f would be lineal feet… s f is square footage, tons are tons, cy is cubic yards.” He said the engineer’s estimate prepared in spring 2024 was lower than the low bid, citing construction-cost increases and other factors.

Matt and staff told council the city remains responsible for long-term landfill monitoring and treatment. The motion to award the contract to Mammoth Construction LLC for $127,019.50 was made by Bill LeClaire and seconded by Tim Petrie; the roll call vote was unanimous in favor.

Staff noted that construction and related engineering oversight and closeout documents (including as-built drawings and any required CQA) will be provided to the DNR under a separate contract and that the city expects to proceed under the bid award this spring.