FINALENVIRONMENTAL STATEMENT MAINTENANCE DREDGING OF THE ,«FEDERAL NAVIGATION CHANNEL AT MONROE HARBOR, MICHIGAN Prepared by:U..S. Army Engineer District Detroit, Michigan 1976 JULYSUMMARY .MAINTENANCE DREDGING OF THE FEDERAL NAVIGATION CHANNELATMONROE HARBOR, MICHIGAN ( ) DRAFT (X) FINAL ENVIRONMENTAL STATEMENT RESPONSIBLE OFFICE: U.S. ARMY ENGINEER DISTRICT, DETROITCORPS OF ENGINEERSP.O. BOX 1027DETROIT, MICHIGAN A8231.TELEPHONE: (313) 226-6752 1. NAME OF ACTION: (X) ADMINISTRATIVE ( ) LEGISLATIVE 2. , DESCRIPTION OF ACTION: Maintenance dredging of'Monroe Harbor,Michigan is normally performed annually during Aptil and Mayfor a period of about 1 1/2 months. Approximately 230,000 cubic yards of sediments will be dredged annually for the next 3-5 years until the area la filled. Once the site is filled, no further dredging will be done until another suitable disposal site is found and an environmental ' impact statement is prepared on the confined disposal site discharge location. This material has been classified as polluted and will be placed in a confined disposal facility to prevent the re-entry of contaminants into the aquatic system. The matetial is removed from a navigation channel and turning basin that ib approximately 5.5 miles in length; extending from the 21-foot water depth in Lake Erie to a point about 1.6 miles upstream of the mouth of the River Raisin. The disposal site is a AO acre diked area owned by the Detroit Edison Power Company located at the mouth of the River Raisin. 3. (A) ENVIRONMENTAL IMPACTS: The harbor dredging action will temporarily degrade water quality. The disposal of the polluted material into the confined disposal facility will convert the nowponded, former lake-shoal area Into a terrestrial environment. Commercial navigation requires maintenance dredging of the channel and harbor area for Immediate continued use. The proposed actions would: (1)-render a partial pollution abatementfunction through the removal of polluted sedime