Power Interface Engrng LLC, 206 3rd Ave, Gallipolis, OH 45631, US

Founded in 1975, Triad is an engineering firm that specializes in civil, geotechnical, environmental and mining engineering. It has more than 200 staff members that provide assistance and support for customers. Its services include drilling and sampling and materials testing. The company also provides waste management and construction monitoring services. It offers surveying and mapping services. Triad offers a range of services, including landslide repair, and airport, commercial and industrial site development services. It offers environmental regulations related to air and water quality, soil contamination and remediation. Its clients include coal companies, contract miners, land companies and design and build construction firms. Triads drill crews are certified by the Occupational Safety and Health Administration and the Mine Safety and Health Administration. It has offices in Morgantown, W.Va., Purcellville and Winchester, Va., Greensburg, Pa., and Hagerstown, Md.