Cal. Health & Safety Code § 44244.1

(a) Any agency which receives fee revenues pursuant to Section 44243 or 44244 shall, at least once every two years, be subject to an audit of each program or project funded. The audit shall be conducted by an independent auditor selected by the south coast district in accordance with Division 2 (commencing with Section 1100) of the Public Contract Code. The district shall deduct any audit costs which will be incurred pursuant to this section prior to distributing fee revenues to cities, counties, or other agencies pursuant to Sections 44243 and 44244.
(b) Upon completion of an audit conducted pursuant to subdivision (a), the south coast district shall do both of the following:
1. (1) Make the audit available to the public and to the affected agency upon request.
2. (2) Review the audit to determine if the revenues from the fees received by the agency were spent for the reduction of air pollution from motor vehicles pursuant to the California Clean Air Act of 1988 (Chapter 1568 of the Statutes of 1988) or the plan prepared pursuant to Article 5 (commencing with Section 40460) of Chapter 5.5 of Part 3.
(c) If, after reviewing the audit, the south coast district determines that the revenues from the fees may have been expended in a manner which is contrary to this chapter or which will not result in the reduction of air pollution from motor vehicles pursuant to the California Clean Air Act of 1988 or the plan prepared pursuant to Article 5 (commencing with Section 40460) of Chapter 5.5 of Part 3, the district shall do all of the following:
1. (1) Notify the agency of its determination.
2. (2) Within 45 days of the notification pursuant to paragraph (1), hold a public hearing at which the agency may present information related to expenditure of the revenues from the fees.
3. (3) After the public hearing, if the district determines that the agency has expended the revenues from the fees in a manner which is contrary to this chapter or which will not result in the reduction of air pollution from motor vehicles pursuant to the California Clean Air Act of 1988 or the plan prepared pursuant to Article 5 (commencing with Section 40460) of Chapter 5.5 of Part 3, the district shall withhold these revenues from the agency in an amount equal to the amount which was inappropriately expended. Any revenues withheld pursuant to this paragraph shall be redistributed to the other agencies or, upon approval of the district board, to entities specified in the work programs developed by the mobile source advisory committee, to the extent the district determines that they have complied with this chapter.
(d) Any agency which receives fee revenues pursuant to Section 44243 or 44244 shall expend the funds within one year of the program or project completion date.