March 5 Update: Engineering Inspection Reports of Burlington Promenade Seawall Reveal Significant Coastal Erosion and Holes in Bulkhead, Requiring Expensive RepairFox News Video
March 5 Update: Engineering Inspection Reports of Burlington Promenade Seawall Reveal Significant Coastal Erosion and Holes in Bulkhead, Requiring Expensive Repair
Notice to City of Burlington Residents and Visitors.
A December ground-penetrating radar survey of the Burlington Promenade seawall has revealed significant coastal erosion in the area between Wood Street to York Street. Consequently, the sidewalk and adjacent land along the Promenade will be blocked until further notice, and pedestrians are asked to avoid this area. (To view the initial Inspection Report, please visit the following link: Ground-Penetrating Radar Report.)
March 5 Update:
On January 21, divers examined the 1800 feet between Watkins Lane (near Wood Street) and York Street (near Oneida Boat Club). They discovered over 120 holes in the metal bulkhead, ranging from less than half an inch to 2 inches in diameter. They discovered over 120 holes in the metal bulkhead, most ranging from less than half an inch to 2 inches in diameter, as well as an undetermined number of holes 6 to 8 inches in diameter. These larger holes allowed the tides to carry water into and out of the supporting soil, causing the sidewalks to buckle in some areas, especially near the bandstand. (To view the Dive Inspection Report, please visit the following link: Seawall Inspection Report.)
Proposed solutions include applying epoxy to block small holes and welding metal plates over larger holes as well as painting exposed surfaces and also using cathodic protection to prevent further corrosion. (Cathodic protection entails installation of sacrificial anodes that will corrode instead of the metal in the bulkhead.) This work can be performed within six months of start.
The estimated cost of the bulkhead project is estimated at $750/linear foot (times 1800 linear feet), and therefore $1,350,000.
We may be able to lift the sidewalk to refill the eroded soil, known as mud-jacking, or we may have to replace the entire concrete slabs, entailing additional costs. Subcontractors are currently preparing estimates for mud-jacking to fill in the voids under the sidewalks. Estimates should be received in early March.
We also have coincidentally discovered that we must replace 8 aging storm water pipes that penetrate the bulkhead as well install new duckbill check valves on them to prevent back-washing. Our engineers are currently preparing estimates for new storm pipes and duck-bill valves. Estimates should be received in early March.
The City is now evaluating grants and low-interest loans, possibly for a 20-year term, and the repairs should be effective for 20 years or longer.
Work will start as soon as feasible, after obtaining financing. For the time-being, to be safe, pedestrians should not enter the margin from the River up to the front of the Bandstand. Most events will not be affected by the sidewalk restrictions or seawall repairs.
As more information is obtained, it will be communicated via this homepage and on City of Burlington NJ Facebook pages.