(a) Unless a proper transfer affidavit is filed under this chapter, or an application for an amended certificate as required by subsection (b) of this section is pending, an existing safety certificate expires on the 90th day after the day on which a sale, lease, or other transfer of title to or operation of the quarry or pit for which the certificate was issued occurs.     
      (b) To obtain an amended or new safety certificate, a new owner, operator, lessor, or lessee must submit a safety certificate application as required by §21.713 of this subchapter (relating to Form and Content of Safety Certificate Applications), not later than the 30th day after the day on which the transfer of title to the quarry or pit occurs or a change in the activities of the quarry or pit necessitates.     
      (c) If an application for a new certificate has been submitted as required by subsection (b) of this section, the existing safety certificate continues in effect until the department's decision either approving or disapproving the new or amended certificate is issued and becomes final.     
     Source Note:        The provisions of this §21.717 adopted to be effective July 15, 2004, 29 TexReg 6734