(a) A permit for a regulated activity shall specify an expiration date. The permit may be extended only upon written request by the permittee to the department's regional office at least one month before expiration. The permittee shall furnish such information as the department may require to determine if the extension shall be granted. After review of the request for extension, the permittee will be given written notice as to whether or not the permit is to be extended.

(b) If, during the term of this permit, the permittee fails to engage in the permitted activities or fails to use the permitted facilities, in whole or in part, for a continuous period of more than two years, the permit and all authorizations under the permit shall be deemed abandoned and the permit shall automatically expire.

(c) Upon expiration of the permit, or if the permit is abandoned, relinquished, suspended or revoked, the facilities authorized by the permit shall be removed or modified by the permittee, at the permittee's expense and as directed by the department, so as to protect the integrity of the flood control works or to restore the flood control works to their original condition or other condition satisfactory to the department.