These include, but are not limited to: cable depth, cable design, the presence of other buried objects in the vicinity of the cable, the type and quality of the cable locator used, and operator proficiency. It is often necessary to locate buried optical fiber cable to prevent dig-ups during construction, to access fibers for termination, to effect repairs, or for other reasons. As measured by the expression. The interruption of the optical cable line caused by external factors or the optical fiber itself, which affects the communication service, is called the optical cable line fault. If an Environmental Protection Agency (EPA) Study is required, copies of the completed study with its letter of acceptance/permissi n mu h of state, cou eyed by engineering and construction personnel. Representatives from each organization having.