• American Gas Association (AGA), “Directional Drilling Damage Prevention Guidelines for the Natural Gas Industry,” Technical Note, December 30, 2004.
  • American Society of Civil Engineers, ASCE Manuals and Reports on Engineering Practice No. 89, “Pipeline Crossings,” 1996.
  • Bennett, R.D., S.T. Ariaratnam, and C. Como, “Horizontal Directional Drilling Good Practices Guidelines,” HDD Consortium, Washington, DC, ISBN 1-928984-13-4, 2001.
  • California Department of Transportation, CALTRANS, “CALTRANS Encroachment Permits—Guidelines and Specifications for HDD Installations,” July 14, 2003.
  • Directional Crossing Contractors Association (DCCA), “Guidelines for Successful Directional Crossing Survey Standards,” Dallas, TX, 1999.
  • Directional Crossing Contractors Association (DCCA), “Horizontal Drilling Safe Operations Guidelines,” Dallas, TX, 1995.
  • Gas Research Institute, “Final Report—Guideline for the Application of Guided Horizontal Drilling to Install Gas Distribution Piping,” GRI-96-0368, September 1996.
  • National Transportation Safety Board, “Safety Study: Protecting Public Safety Through Excavation Damage Prevention,” Washington, DC, December 1999.
  • National Utility Contractors Association (NUCA), “Trenchless Construction Methods and Soil Compatibility Manual,” 3rd Edition, Washington, DC.
  • National Utility Locating Contractors Association (NULCA), “Excavation Practices & Procedures for Damage Prevention,” Spooner, WI, 1996.


One Call Center One Call Center

Facility Owner Facility Owner

Excavator Excavator

Locator Locator

Project Owner Project Owner

Designer Designer