State of Missouri - Reissuance of Regional General Permit NKW-GP-34M - Sand and Gravel Excavation Activities. The U.S. Army Corps of Engineers, St. Louis District, HAS REISSUED Regional General Permit MVS GP-34M for Sand and Gravel Excavation Activities in Waters of the United States within the State of Missouri under the authority of Section 10 of the Rivers and Harbors Act of 1899 (33 USC 403) and Section 404 of the Clean Water Act (33 USC 1344). Duration of this General Permit. The general permit has been issued and is in effect for five (5) years from August 15, 2016 until July 28, 2021, unless revoked or specifically extended.