Storage requirements are as follows:
1. Commercial stock of black sporting powder shall be stored indoors.
2. Quantities of more than one pound and not more than 20 pounds shall be stored in an approved portable magazine constructed in accordance with Section 57.5003.8.7.
3. Quantities of more than 20 pounds and not more than 500 pounds shall be stored inside an explosives vault that conforms to the requirements of Chapter 9 of the Los Angeles Municipal Code (Building Code).