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Terminal 3 & 4 Port of Tacoma

Tacoma, Wash.

General Construction was a subcontractor to Tucci & Sons for this project that included the construction of a 250 lin ft concrete wharf at the Port of Tacoma. The wharf was founded on 24 in. pre-cast octagonal piles. Work included installation of steel sheet piling and steel batter piles for the bulkhead and installation of a fendering system. The fender system at another berth was also upgraded prior to a critical fish closure. This work occurred in an active shipping channel.

Terminal 30 Upgrade Port of Seattle

Seattle, Wash.

The 43-acre Terminal 30 Upgrade project included relocation of the Cruise Ship operation, and returning the terminal to its original function as a container terminal. General's contract was to strengthen the existing concrete wharf in preparation to receive new container cranes. The 1,545 LF dock was upgraded using 166 new concrete piles that support a new waterside crane rail beam. In addition a 1,417 LF sheet pile wall and concrete cap were constructed to support the landside crane rail beam. Approximately, 59,000 cubic yards of material was clam shell dredged to provide -50 feet MLLW throughout the berth.

Terminal 55/56 Port of Oakland

Oakland, Calif.

The project required the demolition of approximately 850,000 sq ft of existing concrete piers. 2.3 million cu yd of clamshell and hydraulic dredging were required and 390,000-tons of rock fill and riprap was placed. 125,000 sq ft of dynamic compaction was required and 1.4 million lin ft of wick drains were installed. The 2,400 lin ft reinforced concrete marginal wharf was constructed on 1,600, 24 in. concrete piling, totaling 116,000 lin ft. The project also required crane rails, drainage, water and electrical service. Paving stones and asphalt concrete finish the back land area.

Terminal 91 Berth M Reconstruction Port of Seattle

Seattle, Wash.

The project included the demolition of the existing timber apron and removal of the associated creosote treated supporting piles. The new dock is comprised of concrete piles, sheet piles, a new bulkhead, battered steel pipe piling, augercast piles and micropiles, concrete caps, concrete decking, steel fender piling and a fender system. Additional riprap, rat rock and other capping materials were added below the apron slope cover. General also installed a ships water line, a catch basin with associated storm sewer piping, a new ships electrical system, security fencing, and a new light pole.

Kingston Outfall

Kingston, Wash.

The first 1,200 ft of pipe was installed on the beach with conventional land equipment from behind the Kingston Marina out to the zero tide mark. The next 500 ft was laid and backfilled one joint at a time during high tides from a derrick barge offshore. The next 2,200 ft was installed and backfilled in a pre-excavated 6-9 ft ditch in 96 ft sections. The ditch was backfilled first with gravel and quarry spalls, then native material previously removed. The final 1,400 ft was laid directly on the bottom out to a set of diffusers at -170 MLLW. All underwater connections were made with divers. At the outer end of the outfall a four-diver crew was required, with each diver only having 14 minutes of bottom time due to the depth.

Lake Youngs Intake

Seattle, Wash.

This project required construction of a steel intake pier 450 ft into an active drinking water reservoir. Our work included 500-tons of fabricated steel supported by 22 piles in four piers. The 175 ton, 50 x 100 ft pump platform was assembled in place before lowering 20 ft and driving piles. In completed form it has steel walls and floor, slide gates, a jib crane and 8 pumps manifold to twin 6 ft pipes back to the beach. The work required a trestle, sheet cell, sectional barges with a 165-ton crane and extensive silt curtains.

Midway Sewer District Submarine Outfall

Kent, Wash.

he initial 285 ft of pipe was installed through a jacked and bored casing installed by a subcontractor. This runs from the Des Moines Beach Park, under a hill, and out the upper portion of the beach. The next 600 ft were installed at low tides with an excavator in a sheet pile trench. All work was performed on non-floatable mats to protect the beach. The next 400 ft of pipe going offshore was installed by divers and a derrick barge in an excavated trench with sheet pile to protect the eel grass. Past the sheet pile, the pipe continues in an excavated trench for 200 ft then daylights and was set on the bottom out to the station 21+00. Precast anchors were set over the unburied section of pipe.

Post Point Alternative Outfall

Bellingham, Wash.

The project began with the relocation of approximately 1,000 sq ft of eelgrass. Then a 250ft long by 50 ft wide trench was dug. Serving as a foundation for the diffuser, three, 4 ft by 12 ft articulated concrete ballast mats were placed at in 55 ft of water in Puget Sound. The 620 ft. long, 54 inch HDPE outfall pipe was sealed at each end and pulled from the beach into the water. While it was floating, 23 concrete weights were attached. Each weight was over 15,000 pounds. After attaching the onshore end to its tie-in point, we used controlled submergence to sink the pipe into the trench and onto the mats. Finally the trench was backfilled and the beach was restored to its previous appearance.

South Bay Ocean Outfall

San Diego, Calif.

General Constructions work started almost 2 miles offshore where an outfall tunnel is connected to the seabed by a 9 ft. diameter riser structure. The 10 ft. diameter seabed outfall trunk line originates at the riser and proceeds west for 4,500 ft., to a 320-ton wye structure. From the wye structure, two diffuser lines extend 2,000 ft. to the north and south along the seabed. This project required dredging 210,000 cubic yards of excavation, and placement of 350,000 tons of rock to bed, ballast and armor the 1.6 miles of outfall pipe. All work was performed 2 to 4 miles offshore, and at an average depth of 100 ft.

Yaquina North Jetty Rock Removal

Troutdale, Ore.

The Yaquina North Jetty project required rebuilding the jetty with previously placed rock that storms and natural wave action had displaced over the years. Typically, more rock is added at the tip to replace rock that has washed out. However, over the years so much rock had been added that it encroached on the entrance channel. A 165-ton derrick barge removed the displaced rock at the tip of the jetty using a large rock grapple. The salvaged rock was then placed onto a 1,200-ton capacity flat deck barge and transferred to the north side of the jetty. In order to take advantage of the short summer season, the rock removal operation went on around-the-clock, seven days a week. 43,000-tons of rock were removed and relocated, with the largest pieces between 20 to 32-tons each.

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