Aqua Ventus Survey -Searsport

Survey Notice to Zone D License Holders near Searsport

Matt Nixon, Survey Operations Manager

(207) 852-3528

matthew.nixon@maine.edu

Read the PDF here: SearsportSurvey-Final

Alpine Ocean Seismic Survey, Inc., (Alpine) will conduct a geophysical survey for Maine Aqua Ventus (MAV) on November 15 – November 19, weather permitting, west and south of Mack Point in Searsport, Maine. The survey will be used to identify a temporary assembly location for two floating wind turbines. The temporary area will be used during the summer/fall 2019 and in the spring of 2020. This letter is intended to provide information to all area license holders.

 Alpine will be using the M/V William M, a 22 ft. vessel with 8 ft. beam and 2 ft. draft. The survey will operate only during daylight hours. A map of the survey and an equipment overview is provided later in this document. The vessel will deploy all survey equipment and at a speed no greater than 4 knots.

MAV will communicate with the Maine Department of Marine Resources and local stakeholders to relay any potential schedule changes. A gear compensation program has been established in case of accidental fishing gear interference.

Thank you,

Matt Nixon, Survey Operations Manager

Maine Aqua Ventus

Survey Equipment

The following acoustic equipment will be used as part of this survey. Towed survey equipment on the William M will be at a depth at least 12 to 24 ft. off the bottom and at a distance ranging from 120 to 200 ft. behind the vessel where applicable based on water depth.

  • Sidescan Sonar which provides a high resolution acoustic image of the seabed and will help identify objects such as pinnacles, rock formations and shipwrecks that may exist along the cable route. This piece of equipment, shown on the right, will be towed.
  • A Magnetometer will provide indications of ferrous (metal) objects on the seabed. This piece of equipment will be towed.
  • A Sub-Bottom Profiler will provide a seismic image of the geology 3.6m(12 ft.) below the seabed and will help identify the geological substructure and other obstructions.
  • A Multi-Beam Echosounder will provide a detailed map of the seabed bathymetryand geophysical content of the seabed.
  • A Bubbler System is a seismic sonar system that will provide an acoustic picture ofthe geological formations found 45m (100 ft.) below the seabed. This system willprovide the Maine State Historic Preservation Office and Tribal Historic Preservation Officers with a picture of the coastline prior to the last ice age.

 

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