SUE: Subsurface Utility Engineering

TBS SUE solutions are performed using four quality levels of utility depiction in compliance with the ASCE Standard Guideline for the Collection and Depiction of Existing Subsurface Utility Data. (CI/ASCE 38-02)

Quality Level D: Records Research/Data Collection – information is derived from existing records research or verbal

Quality Level C: Visible Surface Feature Utility Survey – utility surface feature data is obtained from surveying and plotting above ground utility features (e.g. manholes, valve boxes, etc.) to assist with determining approximate horizontal position of underground utilities.  Used with QL-D. recollections (oral history), providing an overall "feel” for the congestion of utilities, but is often limited in terms of comprehensiveness and accuracy.

Quality Level B: Utility Designation – collected by thorough applications of appropriate surface geophysical sensing technology to determine the horizontal position of subsurface utilities. Example methods: RD 8000, GPR, Metrotech, Non-destructive probing, etc.

Quality Level A: Underground Utility Locating (Test Hole) – highest level of accuracy available and involves the use of non-destructive digging equipment at specific points to determine the precise horizontal and vertical position of underground utilities, as well as the type, size, material, and other characteristics.



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