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Monitoring Cruise At The New London Disposal Site June 1991

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Final rept.

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The objectives of the monitoring cruise at the New London Disposal Site NLON were to 1 delineate the footprint and characterized the topography of the dredged sediment deposited in the vicinity of the NL-TR mound during 1990-1991 2 assess the benthic recolonization rate at the active disposal site and monitor the successional status at the inactive NL-88 mound 3 measure near-bottom and surface dissolved oxygen DO concentrations at the active disposal site and reference areas and 4 collect sediment samples at the three reference areas to provide information on percent total organic carbon TOC, grain size, and levels of polynuclear aromatic hydrocarbons PAHs, cadmium, lead and zinc. During the 1990-1991 disposal season, 31,475 m3 of dredged material was disposed in the vicinity of the NL-TR mound at the 1990-1991 buoy location, 41 deg 16.428 N and 72 deg 04.333 W. A comparison of the June 1991 and July 1990 bathymetric surveys showed an increase in height of 2.4 m at NL-TR. Also apparent was a smaller mound that developed around the buoy and was adjacent to the NL-TR mound. This mound was 0.6 m in height and approximately 100 m in diameter. The combined radii of these two mounds was about 150 m Information obtained from the REMOTSR survey indicated the presence of recently deposited dredged material within 200 m north, 400 m west, and 300 m south of the disposal site center. The majority of disposal site and reference area stations were dominated by Stage II, Stage II on III, or Stage III assemblages. Stage II represents a transitional sere between Stages I and III and is associated with recovery of a disturbed benthic habitat.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Solid Wastes and Pollution and Control

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