Wed February 10, 2021 - National Edition UMA UMA Geotechnical Construction’s work on the NCDOT I-26 Exit 40 to I-40 Interstate Expansion Project is on track to become the largest square footage of soil nail walls done under a single contract in NCDOT history. UMA Geotechnical Construction, a North Carolina-based geotechnical contractor serving the Mid-Atlantic Region, is working on a project that will become the largest square footage of soil nail walls done under a single contract in North Carolina Department of Transportation (NCDOT) history. The contractor is on track to construct roughly 115,610 sq. ft. of wall along Interstate 26 by April of 2022.