California Code, Labor Code - LAB § 7860

(a) The employer shall develop and implement written operating procedures that provide clear instructions for safely conducting activities involved in each process consistent with the process safety information.

(b) A copy of the operating procedures shall be readily accessible to employees or to any other person who works in or near the process area.

(c) The operating procedures shall be reviewed as often as necessary to assure that they reflect current operating practice, including changes that result from changes in process chemicals, technology, and equipment, and changes to facilities.