Project Details

Pililaau Army Recreation Center Seawall Repair | Poka‘i Bay, Hawai‘i


Located on O‘ahu’s scenic Poka‘i Bay, the Pililaau Army Recreation Center (PARC) is home to a seawall that had deteriorated over the years and was in dire need of repair. The seawall runs parallel to a public beach and its dilapidated condition posed a safety hazard to beachgoers and PARC users. For this project, GBI’s O‘ahu Region rebuilt the seawall and beautified the beach area.


GBI demolished the damaged sections of the existing seawall, removed fragmented debris, and reconstructed approximately 677 lineal feet of concrete rubble masonry seawall behind the existing seawall. The lower portion of the newly constructed seawall is comprised of a unique marine mattress system, which includes a one-foot-thick layer of crushed rock retained by a synthetic geoweb. Both the marine mattress and boulder base were constructed in 20-to-60-foot increments depending on the condition of the existing seawall, tidal influence, and proximity to other structures. GBI also relocated a sidewalk and streetlights to beautify the beach area. Among other challenges, GBI crew members worked within a very tight space surrounded by heavy pedestrian traffic. Additionally, GBI exercised extreme caution throughout the project to protect a nearby coral reef, as well as ancient Hawaiian petroglyphs etched into the wall.


GBI used GPS technology to assist with the construction of the new seawall, which meant that live data was always available for the client and stakeholders. The project site was next to a public beach, so keeping the community safe was a top priority. Crew members ensured beachgoers maintained a safe distance from the work zone 24 hours a day, seven days a week. By the end of the project, there were more than 7,800 work hours and zero safety incidents. GBI also worked closely with the client and all regulatory state and federal agencies to ensure there were no adverse environmental impacts. Among other things, crew members learned how to identify endangered species and were instructed to stop working if they spotted any near the work area. Additionally, an archaeologist monitored all ground-disturbing activities throughout the project to ensure the Hawaiian petroglyphs were protected during construction.



Project Details

Region: Oahu
Client: U.S. Army Corps of Engineers
Market: Environmental & Water
Sub-Market: Harbors/Marinas
Value: $3.3 million
Completed: 2019
Services: Demolition / Site Clearing Restoration / Remediation Concrete

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