The enforcing authority may, by notice in writing, require the applicant to furnish such further information as may be specified in the notice, within the period so specified, as the enforcing authority may require for the purpose of determining the application and, if the applicant fails to furnish the specified information within the period specified, the application shall, if the enforcing authority gives notice in writing to the applicant that it treats the failure as such, be deemed to have been withdrawn at the end of that period.