Notice is hereby given that the U.S. Army Corps of Engineers, Philadelphia District, proposes to revalidate and extend the expiration date of State Programmatic General Permit 18 dated November 9, 1987 authorizing the construction of structures, work, and the discharge of dredged and fill material in substantially developed artificial tidal lagoons in the State of Delaware. This general permit is applicable to the appropriate navigable waters located within the geographic boundaries of the Philadelphia District of the U.S. Army Corps of Engineers. The proposed revalidation and extension period is from December 31, 2017 until December 31, 2022. This general permit, CENAP-OP-R-SPGP18, was last revalidated and extended in December of 2012 with an expiration date of December 31, 2017. Comments are due by Oct. 14, 2017.