Apex Engineering, PLLC. is a full-service engineering firm headquartered in Calvert City, Kentucky. Apex was incorporated in 1974 to provide multi-discipline engineering services for industrial clients. Our clients include major producers of specialty chemicals, refrigerants, polymers, nonferrous metals, coal, aggregates, electric power generation, rubber and elastomer products and pulp and paper manufacturers. From small engineering tasks to large-scale projects, Apex Engineering, PLLC. provides unsurpassed quality resources to the client. As a result of superior client services, Apex has built continuing relationships that have lasted for 40 years. The Apex Family of Companies includes: Apex Engineering, PLLC. Apex Controls Specialists, LLC (ACS) Apex Construction, LLC Quadtech, LLC