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Dredged Material Separation
Client: DonJon Marine, Port Authority of New York/New Jersey

SeaVision has been providing dredged material separation services to clients throughout the Port of New York and New Jersey since the U.S. Army Corps of Engineers, New York District began instituting regulatory conditions that require dredging permit holders to demonstrate adequate separation of upland-destined silts from offshore-suitable glacial material, through the use of surveys and sampling efforts. Recently, SeaVision performed such services for the dredging contractor, Don Jon Marine and the project owner, the Port Authority of New York and New Jersey, for a deepening project at the Port Newark shipping container terminal. With an understanding of the underlying geology of the area, the regulatory requirements of the U.S. Army Corps of Engineers, and the operational costs and limitations of dredging projects, SeaVision successfully completed the required sampling and reporting to clear the berth for continued deepening within 40 hours. Special thanks goes also to our friends at AquaSurvey, Inc. who supported us in this project.

Offshore Observation-Class ROV Services
Client: Saipem America, Lonestar Deepwater, Devon Energy

Continued hurricane recovery operations are underwater in the Gulf of Mexico to remove oil platforms from the seabed in order to prevent damage to existing operational assets. On a recent project for Devon Energy, SaipemAmerica encountered an obstruction in a 36-inch diameter steel pipe piling while attempted to deploy an internal pipe cutter within the piling. In order to investigate the interior of the piling and to monitor the progress of cutting efforts, SaipemAmerica subcontracted to SeaVision to provide observation-class ROV service with its SeaBotix LBV150. Deployed to the piling by saturation divers, SeaVision conducted five interior inspections of the piling at depths between 180 and 270 feet of seawater.

ROV Services for Deepwater Research
St. Croix, USVI and Puerto Rico
Client: National Oceanic and Atmospheric Administration

The National Oceanic and Atmospheric Administration, Center for Coastal Monitoring and Assessment recently conducted a Seafloor characterization and inventory of deepwater fish resources of the Buck Island Reef National Monument in St. Croix and the southwest shore of Puerto Rico. This project, over the course of two weeks in March 2006, consisted of multibeam bathymetric surveys of the seafloor in the study area in an attempt to characterize the bottom habitat. The surveys required ground-truth video of the bottom with the use of a remotely-operated vehicle (ROV) so that models of the seafloor could be calibrated according to the actual bottom types.

As the prime contractor for ROV services, SeaVision teamed with SeaView Systems, Inc. to perform ROV missions in depths between 20 meters and 850 meters. SeaVision embarked on the NOAA Research Vessel Nancy Foster for thirteen (13) days in order to provide these services. By utilizing a SeaEye Falcon ROV, outfitted with a LinkQuest Tracklink 1500 HA Ultra-Short Baseline (USBL) Acoustic Tracking System, SeaVision surveyed over 22 kilometers of the seafloor. Deliverables included time-stamped digital video and geographic positioning information that will allow NOAA scientists to compare the bathymetric survey data with the SeaVision-collected video in order to develop deepwater benthic habitat maps of Buck Island Reef National Monument.

Restricted Access Hydrographic Survey
Newport, RI
Client: Naval Inactive Ships Maintenance Office / Global – A 1st Flagship Company

The Naval Inactive Ships Maintenance Office (NISMO) maintains the fleet of decommissioned naval ships that are located nationwide at various military installations. Two decommissioned aircraft carriers, the USS Forrestal (CV-59) and USS Saratoga (C V-60) are currently moored at Pier 1, Naval Station Newport, RI. Hydrographic surveys have not been performed at the Pier in over eight years. Any attempts to move the carriers must be preceded by hydrographic surveys under and around the carriers.

As the prime contractor for hydrographic and ROV services, SeaVision teamed with SeaView Systems, Inc. to develop a unique solution for performing the hydrographic survey of the berths surrounding Pier 1. The first phase of the project consisted of a traditional hydrographic survey using a vessel-mounted echosounder and Differential GPS to survey the vicinity of the pier around the carriers. The second phase of the project consist of using a SeaEye Falcon remotely-operated vehicle (ROV), armed with a sector-scanning sonar and an inertial navigation system to survey under each carrier. The inertial navigation system allowed the team to collect hydrographic survey data of the harbor floor under each of the aircraft carriers and the elevation information for the hulls of the carriers without having to move the carriers from their heavy-weather mooring. Deliverables included drawings and digital data products that will allow NISMO to determine the actual draft of the vessels relative to the harbor floor.

Dredged Material Separation
Naval Weapons Station Earle, NJ
Client: Gahagan and Bryant Associates, Inc; Han-Padron Associates LLC; US Navy

As part of a new pier construction at Naval Weapons Station Earle, the United States Navy demolished a pier and performed the deepening of existing berths prior to new pier construction.  The deepening consisted of the dredging of material unsuitable for placement at the Historic Area Remediation Site (HARS), followed by the dredging of material suitable for placement at the offshore HARS-site.  The US Army Corps of Engineers requested that the Navy demonstrate adequate separation of HARS-unsuitable silt from HARS-suitable sand and clay by using sidescan sonar and sediment sampling.  SeaVision supervised the collection of sidescan sonar data in the berths after the reported completion of HARS-unsuitable dredging by the dredging contractor.  SeaVision then processed and interpreted the sidescan sonar data and developed a sampling plan to aid in the determination of materials separation.  SeaVision observed the sediment sampling in accordance with the recommended plan, logged and photographed each sediment core and reported the results to the Navy.