Letter from the Secretary of the Army transmitting a letter from the Chief of Engineers, United States Army, dated August 1, 1949, submitting a report, together with accompanying papers and an illustration, on a preliminary examination and survey of Twitch Cove and Big Thoroughfare River, Md., with a view to the construction of a boat basin at Ewell, authorized by the River and Harbor Act approved March 2, 1945, and of Levering Creek at Ewell, Md., authorized by the River and Harbor Act approved July 24, 1946.