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(c)If, 20 years from November 17, 1988, any area or part thereof described in subsection (a) is not bulkheaded or filled or occupied by permanent structures, including marina facilities, in accordance with the requirements set out in subsection (b) of this section, or if work in connection with any activity permitted in subsection (b) is not commenced within 5 years after issuance of such permits, then the declaration of non-navigability for such area or part thereof shall expire. Notwithstanding the preceding sentence, the declaration of nonnavigability for the area described in subsection (a)(5), or any part thereof, shall not expire.
United States Government work; public domain under 17 U.S.C. § 105.