Cal. Pub. Res. Code § 48657

The board shall keep accurate books, records, and accounts of all of its dealings, and these books, records, and accounts, and any amounts paid into or from the fund, are subject to an annual audit by an auditing firm selected by the board. The auditing firm or the board shall also conduct a selective audit of entities making payments to, or receiving payments from, the board to determine whether payments required by Section 48650 are being paid to the board on all lubricating oil sold in California, and that grants and recycling incentives are being paid out properly by the board.