Honolulu Board of Water Supply

This project consists of installing approximately 1,900 lineal feet of new, 12-inch waterline in Kapolei Parkway on the island of Oahu, Hawaii. The new waterline will connect two existing water systems offering redundancy in providing a reliable source of drinking water and fire protection to residents. Orion provided design services for the project to plan and implement an effective, efficient solution with minimal disruption to residents and existing structures during the project.

A major challenge for this project is the presence of known contaminated soils in the surrounding area and the crossing under a historical railroad. Research and soil investigations were performed to determine the extent of the contaminated soils; findings were incorporated into the design to minimize impacts during construction. Likewise, coordination with the State Historic Preservation District (SHPD) has been critical for determining the regulatory requirements and construction constraints for the new waterline that will be installed under the historic railroad.


  • Topographic Survey
  • Geotechnical Investigations
  • Archeological Literature Review
  • Section 106 Consultation
  • HRS 6E Review
  • Environmental Historical Research
  • NPDES Permitting
  • Cathodic Protection
  • New Waterline
  • Traffic Control