Accession Number : ADP006838

Title :   Rehabilitation of Estuaries in Takamatsu Harbor,

Corporate Author : JAPAN SEDIMENTS MANAGEMENT ASSOCIATION TOKYO

Personal Author(s) : Ohira, H. ; Nikaido, K. ; Takagi, H.

Report Date : APR 1992

Pagination or Media Count : 16

Abstract : The objectives of this project were to recover the natural environment of Senbagawa District around Takamatsu Harbor and to prevent possible marine contamination by dredging the organic sediment containing polychlorinated biphenyls (PCBs) precipitated in the estuaries of the Senbagawa River. Based on the results of a sediment survey, dredging was recommended for sediment with 10 ppm PCB content and an-ignition loss of 20 percent or above. This involved a quantity of 82,000 cub. m, covering an area of approximately 47,000 sq. m. The related tasks (dredging, transporting, unloading, dredged material solidification, disposal, and covering) are described. Reference values established for the treated and discharged spillwater were: pH, 5.8 to 8.6; suspended solids, 10 ppm or below; and PCB content, 3 ppb or below.

Descriptors :   *DREDGING, *SEDIMENTS, *POLYCHLORINATED BIPHENYLS, *WATER POLLUTION ABATEMENT, CONTAMINATION, COVERINGS, DISPOSAL, DREDGED MATERIALS, ESTUARIES, HARBORS, QUANTITY, RIVERS, SOLIDIFICATION, SOLIDS, SURVEYS, UNLOADING, ORGANIC MATERIALS, TRANSPORTATION.

Subject Categories : Civil Engineering
      Water Pollution and Control
      Solid Wastes Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE