The department shall approve, condition or disapprove an application for a construction permit within 90 days following the date that the application is complete, except that this time period may be extended for a 30-day period by the mutual consent of the applicant and the department, provided that the department request the applicant for such an extension at least 15 days prior to the expiration date for the approval, conditioning or disapproval of such an application.
N.J.S. § 13:1D-31