
183Conducting the Environmental Impact Analysis and Assessment
described general conditions in various Great Lakes areas and also provided
information for some specic locations associated with DCR discharge.
The second source of existing information was the logs of Great Lakes car-
riers where the latitude and longitude of the starting and ending points of
DCR discharge were recorded. Review and plotting of the information from
the ship’s logs revealed that generally the same locations were used year
after year by the vast majority of Great Lakes carriers for deck washing and
discharge of DCR. Thus there were concentrated areas where the ...