Cal. Health & Safety Code § 25503
(b) The standards for business plans in the regulations adopted pursuant to subdivision (a) shall do all of the following:
(c) A unified program agency shall, in consultation with local emergency response agencies, establish an area plan for emergency response to a release or threatened release of a hazardous material within its jurisdiction. An area plan is not a statute, ordinance, or regulation for purposes of Section 669 of the Evidence Code. The standards for area plans in the regulations adopted pursuant to subdivision (a) shall provide for all of the following:
(d)