2 Concrete Leveling Contractors in Libby, Montana

If you need concrete leveling in Libby, the usual culprits are Glacial Lake Kootenai varved silt and clay benches, cobble-gravel Kootenai River alluvium, Belt Supergroup bedrock surroundings, Libby Amphibole asbestos contamination requiring EPA-coordinated soil handling, and engineered fill on the thousands of Superfund-remediated parcels. Libby is the seat of Lincoln County in extreme northwest Montana, sitting on the Kootenai River along US-2 and BNSF's main line about 35 miles south of the Canadian border and 90 miles east of Sandpoint, Idaho. The town gained national attention as the site of the W.R. Grace vermiculite mine that operated from 1963 to 1990 (and earlier under Zonolite Company starting in 1939) and produced about 80 percent of the world's vermiculite supply, all of it contaminated with the highly friable tremolite-actinolite Libby Amphibole asbestos. EPA placed Libby on the National Priorities List in October 2002, declared a Public Health Emergency in 2009 (the first such declaration in agency history), and has spent over $600 million removing more than one million cubic yards of contaminated soil from over 2,600 homes and businesses; cleanup of the residential operable units finished in 2018, with the mine site (Operable Unit 3) and Kootenai Development Impoundment Dam still under active management. Lincoln County retains the highest asbestos-related mortality rate in the United States. The area sits in the Kootenai River valley between the Cabinet Mountains to the south and the Purcell Mountains to the north. Bedrock beneath Libby is principally Proterozoic Belt Supergroup metasediments (siltite, argillite, quartzite, and dolomite of the Wallace, Helena, Snowslip, and Prichard Formations), with the vermiculite-asbestos host rock being the Rainy Creek alkaline-ultramafic intrusive complex 7 miles northeast of town. Above bedrock, Quaternary Kootenai River alluvium (gravel, cobble, silt, sand 30 to 80 feet deep) floors the floodplain, with Pleistocene Glacial Lake Kootenai silts and clays mantling the bench deposits and outwash terraces stepping up the valley walls. Local soils run Bonner silt loam on the glacial-lake bench deposits, Pywell muck on the wetland flats, Rivulet silt loam on the floodplain, Tetrau-Eastrivulet complex on the river terraces, Vay silt loam on the bench slopes, Mission silt loam on the lake-deposit benches, Lakeshore silt loam on the older terrace remnants, and cobbly-gravelly alluvium along the Kootenai River corridor. Between Glacial Lake Kootenai silt and clay benches, Kootenai River cobble-gravel alluvium, Belt Supergroup bedrock surroundings, and pervasive Libby Amphibole asbestos contamination requiring EPA-coordinated soil-handling protocols on most parcels, subgrade behavior is the primary driver of slab movement here.