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Jay Cashman Uses Hydrohammer to Excavate Rock Near Busy Terminal in Port of NY/NJ

Cashman’s dredge S. Comoletti, retrofitted with an IHC S90 hydrohammer, removes rock during the KVK VIII project, summer 2004.  Photo by Bill Benson, Hydrographic Survey Company.

Cashman’s dredge S. Comoletti, retrofitted with an IHC S90 hydrohammer, removes rock during the KVK VIII project, summer 2004. Photo by Bill Benson, Hydrographic Survey Company.

During a dredging project in Newark Bay and South Elizabeth Channels this year, Jay Cashman Incorporated encountered an unexpected deposit of consisting of diabaserock, limestone and shale. The Army Corps Engineers recognized the logistical problems and safety issues involved with blasting at this location, and requested that Cashman develop an alternative to drilling and blasting.

In response to this request, Cashman retrofitted the dredge S. Comoletti, a Demag 385 excavator, with an IHC S90 hydrohammer to remove the rock from May to August of this year. The rock was in an area with a high volume of boat traffic every day, and Cashman used the jack hammer to avoid affecting nearby terminals. Drilling and blasting would have closed the area to boats for the duration of the project.

The implementation of the hydrohammer was embraced by the Army Corps, the Port Authority of New York and New Jersey, and the Pilots Association.

"The nearby terminals never had to shut down," said Alex Dick, with Cashman's Business Development Department.
The rock, was a part of the KVK VIII contract. A GPS antenna was mounted on the top of the tip of the hydro hammer arm, and HYPACK software presented the rock area on the screen for the operator.

The 37-foot, 14-ton hydrohammer can break rock at depths of 65 feet, and can operate at any angle from 55 to 90 degrees. Its small footprint allows dredging and rock breaking to occur concurrently. Barge position and mooring is by spuds only with no anchors, eliminating potential damage to seagrass beds. Unlike conventional diesel- and air-powered hammers, the self-contained hydraulically-operated S90 is quiet and can operate underwater without loss of energy and with no risk of releasing harmful pollutants into the environment. An operator inside the cab has complete control of the operation.

The project, which was nearly complete at the end of October, 2004, deepened the channels to 45 feet with 1.5 feet of overdepth, in approximately one mile of 1000-foot-wide navigation channels. Original project depth was 40 feet.

Most of the 1.3 million cubic yards of material was placed in the HARS, and 160,000 cubic yards that were not suitable for ocean disposal were taken to the OENJ Cherokee terminal in Port Jersey.

Jim Galli is project manager for this contract. Five dredges were used, including the Captain Arthur J. Fournier, the Wood I, the S. Comoletti, the Jay Cashman and Norfolk Dredging Company's Virginian (sub-contracted), along with dump scows Eddie Carroll, Joe Verrochi and Mighty Quinn.

SAIC's dump scow positioning system was used throughout the project.

Jay Cashman Incorporated has invested more than 30 million dollars to expand its fleet of dredges and dump scows, and operates the most marine excavators on in the East Coast of the United States.

The company has recently acquired Modern Continental Construction Company of Cambridge, Massachusetts. The acquisition involves about $500 million worth of construction projects in New England, and may be expanded to include another $200 million of work in the New York area.

Jay Cashman's backlog includes projects for the Corps of Engineers in Southport, Connecticut, for the Port Authority of New York and New Jersey, for Portland Pipeline Corporation in Portland, Maine, and for Marina Bay in Quincy, Massachusetts.







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