CA Health & Safety Code Section 114309

(a)

Mobile food facilities and mobile support units shall be exempt from the requirements of Sections 114250, 114256.1, and 114279.

(b)

Nothing in this chapter shall be deemed to require any person to replace or modify an existing mobile food facility approved for operation prior to adoption of this part, so long as the facility is operated in accordance with the conditions of approval. Plans and specifications may be required by the enforcement agency if it determines that they are necessary to assure compliance with this part.

(c)

Mobile food facilities equipped with a one-compartment sink or two-compartment sink that was approved for operation prior to adoption of this part need not provide a three-compartment sink.