UTILITY LOCATING NEWS:
DC Water has revised the 2018 Project Design Manual to require Subsurface Utility Engineering (S.U.E.)
"3.2 SUBSURFACE UTILITY ENGINEERING Utility designations shall be performed during design as described in CI/ASCE 38-02 to identify underground utilities. Unless otherwise stated, the minimum utility survey designation for locations anticipating excavation work shall be Level C. Level A is required when an excavation will be within 12 inches of an existing water or sewer utility. Level B is required for new water and sewer assets that will be located within two (2) feet of other buried utilities. Levels B and A may be required in site sites(s) specific circumstances when directed by D.C. Water."
Quality Level D information comes solely from existing utility records. This quality level is usually established with information prior to utility designating.
Quality Level C involves surveying visible above-ground utility facilities and correlating this information with existing utility records. This quality level is also usually established prior to utility designating.
Quality Level B involves the use of surface geophysical techniques to determine the existence and horizontal position of underground utilities. This quality level is usually established with utility designating and mapping.
Quality Level A involves the use of nondestructive digging equipment at critical points to determine the precise horizontal and vertical position of underground utilities, as well as the type, size, condition, material and other characteristics. This quality level of information is usually established with utility locating, using vacuum excavation technology, either air vacuum or hydro excavation techniques.