SUE (subsurface utility engineering) is an engineering technique which identifies the quality of underground utility information. Using this technique will result in better designs and enhance damage prevention efforts. The American Society of Civil Engineers (ASCE) developed standard 38-02, which is a guideline for the collection and depiction of subsurface utility data. Listed below are the four SUE quality levels. By following this guideline, you will gain accurate utility information.
SUE Quality Levels
Quality Level D: Utility information is plotted on drawings based solely on records, individual recollections, or the existence of a utility service.
Quality Level C: Utility information is obtained similarly to level D and then plotted with surface utility features that have been field verified, survey located, and accurately reduced onto documents.
Quality Level B: Utility information is derived by establishing the surface horizontal location of utilities using electronic methods such as electromagnetic locating equipment and ground penetrating radar. This is followed by a field survey and reduced onto 2 dimensional maps.
Quality Level A: The 3-Dimensional position of a utility is obtained. Although the ASCE does not specifically name vacuum excavation as the standard, this is the method preferred by most engineers.