USCGC MAPLE Attahment-6 Pier Limitation Report.pdf

This is a waterfront facility inspection and assessment report for the 300' Concrete Pier (RPUID 16769) located at USCG SFO Fort Macon, Atlantic Beach, North Carolina, dated 2023.

The facility assessment indicates a "Poor" condition rating with a Condition Index of 67. The pier is a fixed concrete platform supported by cast-in-place concrete pile caps, beams, and precast concrete piles, measuring 265 feet long by 20 feet wide, and serves as a loading/unloading platform for the cutter's buoy tending operations. The inspection was conducted while the facility was midway through a rehabilitation project that was terminated due to contractor default. The pier remains capable of meeting its posted concentrated load limit of 20,000 lbs. Operational restrictions include restricted access on deck between Bents 20 to 21, with a recommendation to add steel plates to the buoy loading area to distribute concentrated loads. Without repairs, the facility has 5 years remaining service life; with repairs, 10+ years. The next inspection is scheduled for 2028.

Key defects requiring repair include approximately 75 sq ft of open spalling in pile caps, 600 sq ft of open spalling on the edge beam, and approximately 20 sq ft of closed corrosion spalling on edge beams. The deck exhibits varying deterioration levels with surface curing cracks in multiple sections and open corrosion spalling across Bents 19.5 to 21, including fully exposed rebar and through-holes. The curb has open corner corrosion spalls, and the ramp has 4-foot long closed corrosion cracks. Total estimated repair costs are $3,750,700, with short-term high-risk repairs totaling $3,743,200 (underdeck, top deck, edge beam, and pile cap work) and medium-risk repairs of $7,500 (ramp repair).