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Subsurface Utility Clearance Management Program 2.9 Appendix B—Private Utility Technology Applications and Considerations Radio Frequency Radio Electro-Magnetic Frequency Beacon, Technology Detector Electro- Ground Penetrating Acoustic Sonde or EM-61 Utility/Object (connection to utility, Magnetic Radar Plastic Pipe Conductive (time domain 1) or induction without Detector (GPR)(D Locator Rodder electromagnetics)E connection) (passive Insertion swee Power/Instrument Line a G (Energized/Signaled)F1 G Power Line G G (Non-energized)❑ G Sewer/Water Line Y G Y G (Metallic)❑ G Sewer/Water Line metallic) R G G G Instrument/Telecomm * R G Y Lines(Non-energized) G Only if metallic Hydrocarbon Transmission Line G R G R G (Pipeline)*❑ Metallic/Non-Metallic * Y G Y Y metalli Y non- Line(with Tracer Wire) G c metallic Metallic/Non-Metallic G G R non- 91E R non- Line(without Tracer metallic metallic R G Y Y metalli metallic Wire c Metal or Fiberglass UST R G metalli metallic c Additional Considerations Technology Radio Frequency Ground Beacon,Sonde, Variable Electro-Magnetic Penetrating Acoustic Pipe or Conductive EM-61 1) Detector Radar Locator Rodder GPR O Insertion Moist Soil Y G U G Dry Soil Y Y G G Clay Y G G G Concrete w/Rebar Y G G R Long Horizontal Profile G G G G G Short Horizontal but Deep Vertical Y G R R G Profile Access to Line+ G N/A G G G No Access to Line+ G(induction or RIF G passive) G R R R(direct connect) idG Ferrous Metal G G G Non-ferrous Metal Y G Adjacent or crossing conductive Y N/A N/A N/A Y utili ies Each site will be unique.Do not use this table as the sole criteria for technology selection.Use it as a starting point to assess available,applicable technology(s). ♦ Indicates best technology for given object.Site structures,rebar in concrete,shallow groundwater tables,perched storm water,etc.can significantly affect performance and reliability of any electro/magnetic method. Other utilities which cross or are adjacent to the target line can cause the EM sional to bleed or dump to the other utility line. ❑ Metallic lines that have power running through them or can be connected to a tracer signal generator. ♦ Natural gas pipeline locating technicians must be trained/certified(in the U.S.requires DOT and Office of Pipeline Safety standards,other regions may have similar certification or requirements). O Most sensitive to interpretation.The skill,training and experience of operator are critical. Emerging technology with limited availability. + Access:induce unique electronic signature,apply acoustical impulse or insert conductive rodder/beacon/sonde. Generally,an applicable technology Yellow May or may not be applicable MNot generally applicable 03/2025 Corporate Health and Safety Management Program I ROUX 14