Cal. Pub. Res. Code § 48660.5

(a) If the board finds that a shipment of used oil from a certified used oil collection center, curbside collection program, or uncertified publicly funded used oil collection center in a small rural county is contaminated by hazardous materials in excess of that which generally occurs in normal use, which renders the used oil infeasible for recycling, and requires that the used oil be destroyed at a substantially higher cost than the cost generally to recycle used oil, the board shall, upon application by the used oil collection center or curbside collection program, reimburse the center or program for the additional disposal cost, subject to the eligibility requirements of subdivision (b), except as provided in subdivision (c).
(b) A certified used oil collection center, curbside collection program, or uncertified publicly funded used oil collection center in a small rural county is eligible for reimbursement only if it demonstrates to the satisfaction of the board all of the following, except that paragraph (1) does not apply to an uncertified publicly funded used oil collection center in a small rural county:
1. (1) The center or program has established procedures to ensure that the used oil it generates and accepts from the public will not be mixed with other hazardous wastes, especially halogen-contaminated and polychlorinated biphenyl-contaminated wastes. These procedures shall include, but not be limited to, instructing the public and employees that used oil shall not be mixed with other hazardous waste. The board shall not require a center or program to test used oil received from the public as part of these procedures.
2. (2) The shipment contains not more than five gallons or pounds of contaminants combined, based on the contaminant concentrations and the total volume or weight of the shipment.
(c) In a calendar year, a certified used oil collection center, curbside collection program, or uncertified publicly funded used oil collection center in a small rural county shall be reimbursed for not more than one shipment and for not more than five thousand dollars ($5,000) in disposal costs for halogen-contaminated waste or not more than the actual net additional costs of disposing of polychlorinated biphenyl-contaminated wastes, subject to the availability of funds pursuant to paragraph (4) of subdivision (a) of Section 48653.