Cal. Code Regs. tit. 19 § 1566.6
Except as provided in Section 1566.7, Class II magazines shall be located in conformity with the Table of Distances for the Storage of Explosives, but may, subject to the approval of the "Chief" having jurisdiction, be permitted in warehouses and in wholesale and retail establishments when located on a floor which has an exit at outside grade level and the magazine is located not more than 10 feet from such an exit. Two Class II magazines may be located in the same building when one is used only for blasting caps in quantities not in excess of 5,000 caps and a distance of 10 feet is maintained between magazines. The location of Class II magazines, within a building, shall not be changed without the prior approval of the "Chief" having jurisdiction.
Cal. Code Regs. Tit. 19, § 1566.6