Cal. Code Regs. tit. 19 § 1571.5
When explosives are brought into any city, city and county, county, fire protection district, or the state, by any means of transportation, for delivery to an intermediate receiver, consignee's agent or consignee, or to be forwarded to some other destination, the carrier performing the shipment shall immediately notify the consignee and when required, the "Chief" having jurisdiction of the arrival of the explosives, and if said consignee does not receive and remove the said explosives from the possession of the carrier within 48-hours (Sundays and holidays excluded), after such notification, then the railway, trucking firm, vessel agent, or airline shall remove the said explosives from the city, city and county, county, fire protection district, or state or to a permitted magazine or make a report to the "Chief" having jurisdiction, who shall see that the said explosives are moved to a place of safety.
Cal. Code Regs. Tit. 19, § 1571.5