Organized in 1977, John R. Byerly Inc. specializes in geotechnical engineering, construction materials testing and special inspection services. Located in Bloomington, Calif., it offers a wide range of services, such as geotechnical and geological services, field and inspection services and materials testing, among others. The company's services include distressed structure and fault investigations, geological and geotechnical investigations, structural steel fabrication and field welding, to name a few. John R. Byerly Inc. has received approval from DSA as a testing laboratory for school construction projects.. Geotechnical Engineering