ATC Group Services Inc., helps clients design and execute large-scale projects that can have a variety of construction, environmental, health, safety, and technical applications. The firm, which does business as ATC Associates, often can coordinate services to save money. (ATC stands for Assess, Test, and Consult). Companies in the petroleum, health care, construction, retail, and government sectors have used ATC Associates to plan the removal of mold and asbestos, the treatment of sewage, and the proper testing of construction and construction materials. The company operates from some 65 offices in 36 states in the US.