California Code, Public Resources Code - PRC § 42370.5

(a) In order to ensure compliance with this chapter, a food service facility shall provide, upon request by the department, reasonable and timely access, as determined by the department, to contracts, invoices, and purchase orders between the food service facility and a food service packaging manufacturer or distributor that include information demonstrating whether the food service packaging material acquired by the food service facility is in compliance with this chapter.

(b) A food service facility shall maintain any record related to the requirements of this chapter for a minimum of five years, or another period of time as determined by the department.

(c) Records supplied to the department pursuant to this section that are, at the time of submission, claimed to be trade secrets, proprietary, or confidential shall be subject to Article 4 (commencing with Section 17041) of Chapter 1 of Division 7 of Title 14 of the California Code of Regulations, as applicable.