California Code, Health and Safety Code - HSC § 114305

(a) During operation, no food intended for retail shall be conveyed, held, stored, displayed, or served from any place other than a mobile food facility, except for the restocking of product in a manner approved by the enforcement agency.

(b) Food preparation counter space shall be provided commensurate with the food operation, adjacent to all cooking equipment.

(c) Except as specified in subdivision (d), food products remaining after each day's operation shall be stored in an approved commissary or other approved facility.

(d) Potentially hazardous foods held at or above 135°F on a mobile food facility or mobile support unit shall be destroyed at the end of the operating day.