Project Details
Marine
Pensacola, FL
Client: United States Coast Guard
Project Size: $0M – $2M
Marine
Waterfront Repairs and New Fuel System
Project Description
This design-bid-build project included the repair of an existing bulkhead wall and the installation of a new fuel system. The bulkhead wall was leaking at the joints due to high wear from tropical storms and hurricanes. In order to repair the bulkhead wall, approximately 6,000 SF of concrete slab along the 160 LF of shoreline was removed. The Coast Guard’s original repair design called for divers to pack the back side of the joint with oakum and dig down 15’ on the land side where forms would be placed on each joint. Once the forms were placed, the plans called for grout to be injected from the water side of the joint by divers. Sergent Construction (SC) attempted this method which did not work because of the high-water table found on the land side of the wall. SC did a quick redesigned repair approach which placed a new back up wall behind the existing bulkhead wall. Forms were then placed on the back side of the wall along with welded wire fabric for reinforcement. The concrete was then pumped into place with most of the forms remaining under the water level. Sergent Constructions ingenuity increased project safety and sped up the project delivery time.
The new 6,000-gallon fuel system included the installation of an elevated concrete slab. The 25’x14’ elevated slab required the placement of 6-14” auger cast piles as well as 4 test piles which were later removed. The fuel system for this project included the installation of a 4,000/2,000-gallon diesel/gas split Con-Vault fuel tank. Power for the fuel system was obtained from a nearby boat building. To provide electrical power at the pumps, Sergent Construction installed a new breaker panel and ran new O-Cal PVC coated rigid conduit. New explosion proof electrical fittings were also provided. Due to the harsh marine environment, SC installed all new stainless-steel pipe, fittings, and corrosion resist fuel accessories. The fuel system also included the installation of two new PMC electric hose reels.
The project also called for the removal and demolition of the old fuel system. The old fuel system demolition included a 4,000-gallon Con-Vault Diesel, 200-gallon Con-Vault Gas Tank, and all associated fuel tank piping and accessories. In order to ensure that the old fuel lines were plugged, the project required grout to be pumped into the old underground fuel lines.
On this design-bid-build construction contract, Sergent Construction (SC) acted as the general contractor and in addition self-performed the demolition, mechanical, electrical, and plumbing. In total, SCS self-performed 70% of the scope of work.
Pile Replacement at USCG Base LA/LB
Project Details
Marine
San Pedro, California
Client: United States Coast Guard
Project Size: $0M – $1.5M
Project Description
The project’s scope of work involved repairs and replacements of existing piles near and around the boat basin at the United States Coast Guard’s Base LA/LB located in San Pedro, California. Many of the existing mooring piles and creosoted fender piles at this Coast Guard Station were corroded and delipidated from the harsh coastal marine water and environment. This presented challenging circumstances to remove the piles, sometimes done in pieces due to the degree of corrosion and disintegration. In addition to removing some piles in pieces, other piles had to be removed by using special drilling equipment to loosen the sandstone and hard ground before removal was possible.
The replacement of the mid-basin piles was done with the drilling and driving of new Polymeric piles, filled with 5000 PSI concrete. After installing the piles, Sergent construction applied a fiber reinforced wrap to protect the piles from corrosion, weathering, biological growth, and constant impact from the ocean. This work was performed under the watch eye of the Marine Mammal Monitoring agency, assigned to document and ensure that the construction and renovation efforts would not interfering with sea life.
Additional work on this project included helping the USCG determine which additional piles needed repair or replacement. Upon request and out of goodwill for the USCG, we produced pile status reports to show the current condition of piles that may require future work. The USCG appreciated this and subsequently awarded additional and much needed repair work. In addition, two of the piles needed to be relocated due to unforeseen underwater ground condition. After design review and approval, these two piles were approved and relocated. Finally, floating dock piles were also coasted with a protective covering to protect them from UV rays and corrosive factors that could penetrate the pile material.
Sergent Construction Services acted as the general contractor on this project. We successfully completed this project by overcoming challenging underwater conditions while maintaining the environmental integrity of the sea life within the basin and surrounding waters.