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Examples of the Application of CMC 
A recent capping operation (in 1979) was carried out by the New England 
Division of the U.S. Army Corps of Engineers. The specific source of 
polluted sediment containing various industrial pollutants was Stamford 
Harbor, Connecticut; the clean capping silts and sands were dredged from 
New Haven Harbor (Morton, 1980a). Some 38,000 cu m of polluted material 
was capped with about 76,000 cu m of clean material. Extreme shoaling 
required that both harbors be dredged in 1979 to insure safe passage of 
commercial traffic to oil and other terminals in those cities. The fate 
of this material is being monitored on a regular basis by precision 
bathymetric surveys. It was still in place, as of late 1980, although the 
originally irregular surface of the cap has been smoothed by the passage of 
storm waves. 
In 1980 a million cu yd of PCB enriched dredged material from the New 
York/New Jersey area was placed in the Mud Dump in the New York Bight and 
capped in November with two million cu yd of harbor mouth material. The 
results are being monitored (pers. communication, Dr. Dennis Suszkowski, 
Corps of Engineers, New York District, Feb. 1981), by precision bathymetry, 
translocation of dumped sediment, and field bioassay using live mussel 
(Mytilus edulis) held at the site. .— 
In Norwalk Harbor, Connecticut a pit was dredged alongside the channel in 
which a spill of napthalene and nitrobenzene and other toxic chemicals had 
occurred. After placement of the 1500 cu m of polluted material in the 
pit, some 20,000 cu m clean material was to be applied (Morton, 1980b). 
Environmental Soundness 
Available evidence indicates that CMC is held to be an environmentally 
sound method by which to safely dispose of polluted dredged material in 
moderate depths where precision dumping around a taut-wire buoy can be 
accomplished. If deep-water disposal sites are to be used, dredging should 
be done only with a clamshell and dumping will require locating the exact 
