Accession Number:

ADA030236

Title:

Dredged Material Research. Notes, News, Reviews, Etc. Volume D-76-4

Descriptive Note:

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s):

Report Date:

1976-08-01

Pagination or Media Count:

12.0

Abstract:

The biological and water-sediment quality effects of open-water disposal of dredged material are being evaluated under the Environmental Impacts and Criteria Development Project EICDP of the DMRP in Task 1A Aquatic Disposal Field Investigations. The Duwamish Waterway study is one of four regional aquatic disposal field investigations sponsored by the DMRP. The other sites include Lake Erie off Ashtabula, Ohio the mouth of the Columbia River and the Gulf of Mexico off Galveston, Texas. The study site in Puget Sound represents the only estuarine site where the environmental effects of dredged material disposal by barges instead of other disposal modes are being studied. Recent studies have shown that another factor makes this site important for study purposes-the potentially adverse biological consequences that may result because of an accidental spill of 984 l of polychlorinated biphenyls PCBs in September 1974 into the Duwamish River where maintenance dredging is required. Historically, maintenance dredging of the Duwamish River has required the removal of approximately 230,000 to 305,000 cubic meters of sediment every 3 to 5 yr. The primary mode of disposal has been pipeline discharge to a shore disposal area. For the present study, Duwamish River sediments were removed by a mechanically operated clamshell dredge, deposited in barges, and transported to an experimental disposal site in Elliott Bay for disposal. Author

Subject Categories:

  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE