For any permit authorized under this chapter the permit authority shall impose a time limit within which the proposed site work must be completed. The time limit for expiration of the permit shall be 180 days unless otherwise noted on the approved grading plans and conditioned on the approved grading permit. The director is authorized to grant one or more extensions of time for additional periods not exceeding 90 days each. The extension shall be requested in writing with justifiable cause demonstrated. (Ord. 1169 § 4, 2009).