260 
CONCLUSIONS 
* 
% 
+ 
Ba 
* 
% 
The need for dredging of ports and harbors both 
for enlargement and maintenance of existing channels 
is expected to increase in the 1980's and beyond. 
A certain percentage of this dredged material, 
particularly that derived from maintenance dredging, 
can be expected to be polluted with Annex I sub- 
stances. 
This material must be disposed in such manner as to 
cause the receiving environment as little degradation 
as is reasonably possible. 
By the same token, it is becoming increasingly 
difficult to find and use disposal sites on the land 
that can be considered safe and within reasonable 
distances from the ports and harbors. 
Examination of the marine environment reveals that 
it has a high potential for assimilating dredged 
material without creating undue environmental risk. 
Therefore, after thoughtful study of the problem 
and the delineation of possible solutions, it is 
concluded that if "special care'' measures are used 
in disposal and in dumpsite selection, the disposal 
into the marine environment of dredged material 
containing Annex I substances would in many cases 
present no greater risk of environmental harm than 
the disposal of AnnexII substances. 
Accepting this, it is reasonab’e to consider that 
under these circumstances, the rationale of the 
Convention should allow the disposal of such dredged 
Matarial at sea under a "special permit," as in 
the case of substances listed in Annex II. 
