Accession Number:

ADA058000

Title:

Aquatic Disposal Field Investigations Duwamish Waterway Disposal Site Puget Sound, Washington. Appendix D. Chemical and Physical Analyses of Water and Sediment in Relation to Disposal of Dredged Material in Elliott Bay. Volume I. February-June 1976.

Descriptive Note:

Final rept.,

Corporate Author:

WASHINGTON UNIV SEATTLE LAB OF RADIATION ECOLOGY

Report Date:

1978-06-01

Pagination or Media Count:

221.0

Abstract:

A study was conducted on the chemical and physical effects of open-water disposal of dredged material from the Duwamish River into Elliott Bay, Washington. The water column at the disposal and reference sites was monitored during and after the dredged material disposal operation for suspended solids, pH, nutrients NH3-N, NO2 NO3 and O PO4-P, and dissolved heavy metals Hg, As, Cr and Mn. The river sediments were evaluated for particle size distribution, Eh, organic C, sulfides, nutrients NH3-N, NO2 NO3 and O PO4-P, and bulk and interstitial heavy metals Hg, As, Cr and Mn prior to dredging. The river sediments which were dumped at the experimental bay site were heterogeneous in their physical and chemical character although on the average NH3-N, alkaline soluble sulfide and total Hg were several times higher than the bay sediments. During the disposal operation near bottom water column concentrations of d-Mn, suspended solids and NH3-N were elevated for a short time generally minutes at the disposal site. No chemical differences were observed between the water column at the disposal site and reference sites during the sampling at 1 week, 1 month and 3 months after the termination of the disposal operation.

Subject Categories:

  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE