This is a sole-source contract modification for emergency waterfront stabilization repairs to the Glass Breakwater at Apra Harbor, Guam. The work addresses damage from Typhoon Sinlaku and includes bathymetric surveys, hydrodynamic modeling, rock recovery, and armor stone placement. The estimated value of this modification is $30,000,000. No submission timelines or performance location beyond Guam are specified. The action is justified under unusual and compelling urgency.