The U.S. Army Corps of Engineers and Maine Department of Transportation will hold a public meeting on Wednesday to discuss plans to dredge part of Searsport Harbor. The dredging would remove silty sediment from a 500-foot-wide channel extending from the deep water in Penobscot Bay to Mack Point as well as a 1,500-foot-wide turning area near Mack Point’s piers, which are used mainly for receiving petroleum products and road salt and exporting lum…