BTL, has been operating from the city of Santa Clara since 1967, providing a wide range of services. Bess MTI, Inc., our testing laboratory continues to provide destructive and nondestructive testing of materials. However, since 1995, with current ownership and management additional services have been incorporated. We offer a complete range of Subsurface Utility Engineering (SUE) services and specialize in blind searches and "hard to find" utilities to both private and public companies throughout California, Nevada, and Arizona. Our customers in Underground Utility Locating, ranges from public companies such as Caltrans Districts 1,4,5 & 6, EBMUD, PG&E, private design, engineering firms and cities.