Cal. Pub. Res. Code § 3233

(a) The division may develop field rules which establish volumetric thresholds for emergency reporting by the operator of oil discharges to land associated with onshore drilling, exploration, or production operations, where the oil discharges, because of the circumstances established pursuant to paragraph (1) of subdivision (c), cannot pass into or threaten the waters of the state. The division may not adopt field rules under this section, unless the State Water Resources Control Board and the Department of Fish and Game first concur with the volumetric reporting thresholds contained in the proposed field rules. Subchapter 1 (commencing with Section 1710) of Chapter 4 of Division 2 of Title 14 of the California Code of Regulations shall apply to the adoption and implementation of field rules authorized by this section.
(b) The authority granted to the division pursuant to subdivision (a) shall apply solely to oil fields located in the San Joaquin Valley, as designated by the division. The division shall adopt the field rules not later than January 1, 1998.
(c) For purposes of implementing this section, the division, the State Water Resources Control Board, and the Department of Fish and Game shall enter into an agreement that defines the process for establishing both of the following:
1. (1) The circumstances, such as engineered containment, under which oil discharges cannot pass into or threaten the waters of this state.
2. (2) The volumetric reporting thresholds that are applicable under the circumstances established pursuant to paragraph (1).
(d) In no case shall a reporting threshold established in the field rules, where the oil discharge cannot pass into or threaten the waters of this state, be less than one barrel (42 gallons), unless otherwise established by federal law or regulation. Until field rules are adopted, emergency reporting of oil discharges shall continue as required by existing statute and regulations.
(e) An operator who discharges oil in amounts less than the volumetric thresholds adopted by the division pursuant to this section is exempt from all applicable state and local reporting requirements. Discharges of oil in amounts equal to, or greater than, the volumetric thresholds adopted by the division pursuant to this section shall be immediately reported to the Office of Emergency Services which shall inform the division and other local or state agencies as required by Section 8589.7 of the Government Code. Reporting to the Office of Emergency Services shall be deemed to be in compliance with all applicable state and local reporting requirements.
(f) Oil discharges below the reporting thresholds established in the field rules shall be exempt from the emergency notification or reporting requirements, and any penalties provided for nonreporting, established under paragraph (1) of subdivision (a) of Section 13260 of the Water Code, subdivisions (a), (c), and (e) of Section 13272 of the Water Code, Section 25507 of the Health and Safety Code, Sections 8670.25.5 and 51018 of the Government Code, and subdivision (h) of Section 1722 of Title 14 of the California Code of Regulations. Oil discharge reporting requirements under Section 51018 of the Government Code shall be applicable if a spill involves a fire or explosion.
(g) This section shall not affect existing reporting or notification requirements under federal law.
(h) Nothing in this section shall be construed to relieve any party of any responsibility established by statute, regulation, or order, to clean up or remediate any oil discharge, whether reportable or exempt pursuant to this section.
(i) Reporting provided pursuant to this section is not intended to prohibit any department or agency from seeking and obtaining any supplemental postreporting information to which the department or agency might otherwise be entitled.
(j) For purposes of this section, “oil” means naturally occurring crude oil.