Cal. Lab. Code § 7911

If there are practical difficulties or unnecessary hardships for an operator to comply with the rules and regulations under this part, the division may modify the application of such rules or regulations if the spirit of the rules and regulations shall be observed and the public safety is secure. Any operator may make a written request to the division stating his grounds and applying for such modification. Any authorization by the division shall be in writing and shall describe the conditions under which the modifications are permitted. A record of all modifications shall be kept in the division and open to the public.