Section 344.21 - Expiration and Renewal(a) Each Blaster's License issued under this Article shall be valid for a period of five years with renewal privileges.(b) Application for, and granting of a renewal, shall be administered in the same manner as an original Blaster's License. The Blaster's License examination will be required each five years.Cal. Code Regs. Tit. 8, § 344.21