Cal. Health & Safety Code § 40724.7

(a) A district that is designated as being in attainment for the federal ambient air standard for ozone shall adopt a rule or regulation as described in Section 40724.6 shall fulfill both of the following conditions:
1. (1) The regulation shall be adopted not later than July 1, 2006, unless a district board makes a determination in a public hearing, based on substantial scientific evidence in the record, that large confined animal facilities will not contribute to a violation of any state or federal ambient air quality standard.
2. (2) The regulation may not be submitted for inclusion in the state implementation plan.
(b) Nothing in this section shall delay or otherwise affect any action taken by a district to reduce emissions of air contaminants from agricultural sources, or any other requirements imposed on a district or a source of air pollution pursuant to the federal Clean Air Act (42 U.S.C. Sec. 7401 et seq.).
(c) In adopting a rule or regulation pursuant to this section, a district shall comply with all applicable requirements of this division, including, but not limited to, the requirements established pursuant to Section 40703, 40727, and 40728.5.
(d) Nothing in this section authorizes a district to adopt a rule or regulation that is duplicative of a rule or regulation adopted pursuant to Section 40724.
(e) The rule or regulation adopted by a district pursuant to this section is not required to be submitted for inclusion into the state implementation plan.