K1-95-HW: Cruise Report 1995 - Preliminary results.

Phase III: Sediment Chemistry and Biological Sampling Survey

M.E. Torresan, M.A. Hampton, J.H. Barber, Jr., and F.L. Wong

U.S. Geological Survey Open-file Report 95-839

1995

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS.

Summary
Introduction
Study Area
Previous Studies
  Designation
  Monitoring 1, 2
Methods
  Vessel
  Navigation
  Sampling
  Subsampling 1, 2
Results
Acknowledgments References 1, 2

Figures
1 Location
2 Box corer

Tables
1 Stations
2 Samples
3 Analyses
4 Bioassay

Appendices
1 Box Cores
2 Custody: Quanterra
3 Custody: Batelle

INTRODUCTION
Cruise K1-95-HW was the third survey in a multi-year program designed to monitor active and inactive deep ocean disposal sites in Mamala Bay, Honolulu, Hawaii, used for the disposal of harbor dredged materials (Figure 1). The survey was conducted by the U.S. Geological Survey (USGS) Branch of Pacific Marine Geology for the U.S. Army Corps of Engineers (COE) and the U.S. Environmental Protection Agency (EPA). The ultimate goal of the program is to determine if the disposal activities at the South Oahu disposal site adversely affect the benthic environment and ecosystem of Mamala Bay. The primary objectives of the K1-95-HW survey were to collect box core samples for four specific types of analyses: (1) Biological studies composed of benthic species identification in the upper 7 cm of the seafloor; (2) surficial sediment sampling for high-resolution chemical analyses to compare with identical data collected in 1994 (Quanterra, 1995a-f); (3) Sediment sampling for bioassay and bioaccumulation studies conducted by Battelle Pacific Northwest Division, Marine Sciences Laboratory; and (4) sediment samples collected along transects both south and west away from the South Oahu disposal site to determine if any post disposal, secondary transport of dredged material and associated contaminants is occurring. This four-pronged analysis combined with the acoustic, camera, and sampling surveys conducted in 1993 and 1994 (Torresan and others, 1993a, 1993b; Torresan and others 1994a; 1994b; 1995) will aid the COE and the EPA in assessing affects of disposal activities on the ecosystem of Mamala Bay, thus allowing both agencies to make informed decisions on disposal site management in Mamala Bay.

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