3500 TERMINAL AVE 2022-08-25 - Laserfiche WebLink

} SEPA MDNS South Terminal Modernization,Phase 2 (Page 2of5� New pile caps will then be constructed and will be cast-in-place concrete. The pile access holes in the wharf deck will be filled with concrete,and ballast rock, and pavement reinstalled. Repairs will be made to approximately 30 existing concrete pile cap beams. These repairs involves removal of damaged concrete,cleaning the corroded reinforcing steel(rebar),and replacement of the concrete. Additional cathodic protection will also be included. There repairs may also include use of an epoxy coating,epoxy mastic, or combination thereof to seal any cracks or spalls in order to extend the life of these concrete elements. No dredging will be required to accomplish this work. Water depths of the existing under wharf riprap through which the piles will be driven,range from approximately+4 to-40 feet MLLW. 3. Crane Rails and Gantry Cranes: Two 100-foot gauge rail-mounted ship-to-shore gantry cranes will be installed atop the newly strengthened wharf deck. This includes installation of(2) crane rail support beams running the length of the wharf under the deck. The pair of rails will run north/south parallel with the face of the wharf and will be spaced 100-feet apart. The gantry cranes will be electrically powered and will require upgraded electrical utilities as described in the next section. The proposed gantry cranes have not yet been procured,therefore the following dimensional description is a generic approximation based on typical 100-foot gauge equipment. All measurements are approximate and are measured from the surface of the wharf deck(which is approximately+19 feet above MLLW). With the boom arm in the down (operating)position, the apex height of the crane frame is 220 feet above the wharf deck. With the boom arm in the upright(non-operating stored)position,the maximum height of the arm is 310 feet. When the boom arm is down and in use,it extends approximately 170 feet from the main structure. The back of the crane is approximately 80 feet behind(landward)the land-side rail. The width of the crane frame (in the direction parallel to the rails)is approximately 65 feet. 4. Shore Power and Utilities Upgrades: Utility work will include upland trenching from the existing electrical utility service at the eastern edge of the Port's property to the strengthened wharf. Existing utilities on the wharf are located within the crushed rock ballast section of the wharf deck. Electrical utility upgrades are needed to provide electrical power supply to the 100-foot gauge gantry cranes, one plug-in receptacle to provide a powering station for the Port's existing mobile harbor cranes,and to provide shore-based power("cold ironing")for ships berthing at the wharf. To power this new electrical system,the service will originate from a new Snohomish Public Utility District electrical service(SnoPUD)located adjacent to Building T-6 (equipment shed) at the east side of the Port's marine terminals property. At this location(approximately 50 feet by 30 feet) will be a new pad-mounted SnoPUD switchgear, metering cabinet and transformer as well as a 4.16kV switchgear that will feed the gantry crane switchgear and a"cold iron"transformer on the apron adjacent to Building T-5 which will be removed as part of the proposal. Both of these feeders will run underground via a concrete encased duct bank. At the apron near the Building T-5 footprint,a 4.16kV switchgear serving the gantry cranes and the mobile harbor crane receptacle,and a"cold iron"transformer and"cold iron"switchgear serving the two shore-to-ship power connections will be installed. These new electrical utility facilities will occupy a 50-foot by 10-foot area. The feeders to the gantry cranes and shore-to-ship power connections will run underground via concrete encased duct banks to two new vaults next to the South Terminal Wharf. From the crane power vault,conduits will run within the wharf deck to a new vault at the bullrail to power the gantry cranes. From the cold iron vault,conduits will run within the wharf deck to two new vaults provide shore-to-shore power connections. Each of the three new vaults located on the wharf is approximately 8 feet long, 4 feet wide and 3 feet deep and will be installed with interlocked receptacles.