Summary_Current_Conditions_and_Proposed_Army_Salvage_Plan.pdf

Salvage Vessel or Floating Crane Services Hoquiam Navigation Channel, Washington

Solicitation W912DW-17-Q-0091

Supplemental Information for Bidders Summary Current Conditions and Proposed Army Salvage Plan

FOR INFORMATION ONLY

Vessel

Size: ~32 feet Type: Stern Picker Fishing Boat Hull: V-Hull Engine: Inboard Construction: Fiberglass Depth: ~5-6 feet (Gunwale to Keel) Beam: ~14 feet Superstructure: None

Bits for guiding nets

Starboard Side Console

Drum winch for nets Centerline of the keel Aft of the Console

Bow

Bow

Bow

Stern

Stern

Stern

- Boat is listing to the Port Side which allowed silt to build up and spill over the gunwale and onto the deck

- Starboard bow is out of the silt almost to the keel because it is resting on timber logs/piles

- Port bow is deep in silt halfway up the freeboard. as you move towards the midline, the silt covers the entire port side.

- The Stern is about 2-3' exposed out of the silt; just enough so that the propeller shaft, struts, and screw can be felt in shallow silt

Silt Accumulation - Shows the silt buildup in relation to the boat as its resting on the bottom.

Starboard view of silt accumulation

Port view of silt accumulation

Waterway

Hoquiam River mouth

- Depth: 40-50'

- Tidal Currents ranging from 0-3 knots; Slack tide lasts approximately 1 hour.

- We experienced milder currents on bottom with 30lbs in SCUBA

- Visibility is "Pitch Black"

- Bottom Type: Silt and Debris

- Notable Obstacles: Timber and other logging remnants litter the bottom; Fishing Nets

- Small Boat Traffic

- Gap Width - Approximately 100-200 yards

Proposed Army Maneuver

Proposed Salvage Operation - Conducted in 4 Phases

I. - Survey and Marking II. - Excavation, Tunneling, Preliminary Rigging III. - Excavation, Final Rigging IV. - Mechanical Lift

Proposed Salvage Plan

Phase I - Marking

1. Mark the vessel's bow and stern with buoys and tag lines

2. Attach emergency lift bags (100lb open-bottom) to the bow and stern

a. Bow - Shackle the lift bag to a strength-member on the forward section (Bow Eye, Drum Winch, Helm, etc)

b. Stern - The struts and propeller shaft would be a good location

Phase I - Marking

Phase II - Excavation, Tunneling, and Preliminary Rigging

1. Diver's will begin excavating using 250gpm trash pumps; jetting a tunnel under the hull of the boat. Placement of the tunnels under the vessel will be approximately 1/8th of the vessel's length from the stern (4.5') and approximately 1/2 the vessel's length (18') from the first. The gap between the tunnels for slings should be roughly half the vessel's length.

2. Once tunnels have been successfully created, divers will then feed 10-ton Kevlar lifting slings through the path through the mud. There will be a 100lb open-bottom lift bag on the tail end of the sling.

3. Each end of the sling will run through the eye of a nylon lifting strap that will be connected to the adjacent Kevlar sling on the same side of the vessel. The nylon strap will act as a connector between the two slings, running parallel to the keel.

4. Once the Kevlar slings and Nylon straps are in place, the divers will ensure the slings in a choker configuration and that the 100lb open-bottom lift bag runs through the loop of the sling. Diver then partially inflates the lift bag.

Phase II - Excavating, Tunneling, and Preliminary Rigging

Phase III - Excavation, Final Rigging

1. Divers will finish excavating using 250gpm trash pumps; jetting mud, silt, and other debris out from under the hull of the boat. Divers will work together to free the starboard side from the mud suction and clear all sediment from the compartments below the deck. Finally, Divers will carefully clear out all the silt that is burying the port side of the vessel.

2. Divers will test the stability of the vessel as they are clearing mud from its sides.

If any debris is discovered which could become hazardous to the lifting operation (i.e. rope or abundant fishing nets), the divers will remove the hazards and/or ensure they do not pose a threat to the lift.

3. When excavating operations are complete, divers will ask for the crane and spreader bar. Bow/Stern lines can be run from the surface down to the shackle below to guide the rigging into place.

4. Divers will attach the shackles from the Kevlar slings to the spreader bar ensuring there are no twists in the legs.

Phase III - Excavating and Final Rigging

Phase III - Excavating and Final Rigging

Phase IV - Mechanical Lift

1. Divers will remove all equipment that is not involved in the mechanical lift and return to the surface. Divers will return to their benches but stay dressed to the neckdam.

2. Crane operator will conduct mechanical lift with two (2) line handlers operating the tag lines.

3. Once the vessel is out of the water and secured to the barge, divers may undress and diving operations will cease.

Phase IV - Mechanical Lift