Cal. Code Regs. tit. 14 § 1744.1
All wells shall be cased and cemented in a manner that will fulfill the requirements of Sections 3106, 3219, 3220, and 3222 of Division 3 of the Public Resources Code. The proposal to drill, redrill, or deepen shall include a casing program designed to provide for firm anchorage and for full protection of all oil, gas, or fresh water zones. All casing strings shall be new pipe or equivalent, capable of withstanding all anticipated collapse and burst pressures to be encountered or used. For the purpose of these regulations, the several strings in order of normal installation are conductor, first surface, second surface, intermediate, protective, and production.
Casing strings shall be run and cemented prior to drilling below the specified setting depth, subject to minor variations necessary to allow the casing to be set in firm compacted or consolidated stratum. All depths refer to true vertical depth (TVD) below the ocean floor, unless otherwise specified. Determination of proper casing setting depths shall be based upon all geological and engineering factors, including but not limited to the presence or absence of hydrocarbons, formation pressures, fracture gradients, lost circulation intervals, and the degree of compaction or consolidation of formations.
Cal. Code Regs. Tit. 14, § 1744.1