Summary

Introduction 1, 2
  Study Area
  Previous Studies
  Oceanography
  Seafloor Materials

K1-93 Survey
  Methods
  Scope of Work
  Navigation
  Sidescan Sonar
  Bathymetry
  Profiling

Results
  Bathymetry
  Sonar, 3.5kHz 1, 2, 3

Conclusions

Figures
  1   2   3   4   5
  6   7   8   9 10
11 12 13 14 15
16 17 18 19 20

Plate 1

Apx 1: Statistics 1
Apx 1: Statistics 2
Apx 2: Equipment 1
Apx 2: Equipment 2
Acknowledgments

References 1, 2, 3

Defining the ultimate fate of the silt and clay size particles contained in the dredged material will aid in determining the fate of associated contaminants. The dredging process loses an undetermined amount of silt- and clay-size material with excess water decanted from the dredge hopper prior to disposal, while another portion is dispersed in the water column at the time of disposal (Tetra Tech, 1977; U.S. Environmental Protection Agency, 1980). Shipboard observations indicate that while a large but unknown amount of silt and clay is lost during the dredging process, a major amount of fines are retained and disposed of at the site (Tetra Tech, 1977; U.S. Environmental Protection Agency, 1980). The 1977-1978 studies observed that an unknown amount of fines disperse from the disposal site in the form of a plume that moves to the southwest immediately following disposal. It is important to understand the local circulation patterns in order to quantify the amount of material contained in the dispersing plume, and to define its final resting site, because the finer components of the dredged material are most likely to contain the highest proportion of contaminants.