California Code, Health and Safety Code - HSC § 114306

(a) A single operating site mobile food facility is restricted to produce, prepackaged food, and limited food preparation.

(b) Notwithstanding Section 113984, a mobile food facility operating within a fully enclosed structure shall not be required to provide a secondary food compartment over food preparation areas.

(c) A single operating site mobile food facility that is required to provide warewashing and handwashing facilities shall provide a warewashing sink and handwashing sink per site or operation. A warewashing and handwashing sink contained in a facility to which this subdivision applies shall be conveniently located so as to be accessible during all hours of operation. Additional handwashing sinks may be required pursuant to paragraph (1) of subdivision (b) of Section 113953.

(d) Notwithstanding Section 114095, a warewashing sink may be shared by not more than four mobile food facilities operating as a single operating site mobile food facility that is required to provide a warewashing sink, if the sink is conveniently located so as to be accessible during all hours of operation.

(e) For purposes of permitting and enforcement, the permitholder of each single operating site mobile food facility location shall be the same.