The Montana Department of Transportation (MDT) was plagued with 9 shallow and deeper-seated landslides at six sites throughout the eastern two-thirds of the state. In order to repair the sites quickly, effectively, and at the least cost, MDT put out a design/build solicitation to repair the sites.
GSI® teamed with Great West Engineering out of Helena, MT. The team scored highest on both the Statement of Qualifications and the technical score, and, most importantly, came in $2.8 million dollars under the next responsive bidder. After award, GSI® allocated up to 5 crews working concurrently to ensure the project was completed on time. GSI®’s equipment experts designed and built special grout plants that could keep working in the sub-zero temperatures of Montana’s “spring.” MDT, impressed with the work as it progressed, added a seventh site to the list during construction.
GSI® finished all seven sites before the original six-site deadline. As usual, no contractor initiated change orders were made, with the only change in scope being those requested by MDT. GSI® crews installed a total of 1,800 SuperNails®, 32,000 square feet of galvanized high strength mesh, and 21,000 square feet of shotcrete. Each of these projects is supported by GSI®’s industry-leading Multi-Year Performance Warranty.
A variation of karst sinkhole grouting is the grouting of mined coal seams and workings located below existing infrastructure that exhibit the potential to propagate to the surface and cause sinkholes and/or subsidence.