Cal. Health & Safety Code § 42301.1

Whenever necessary and appropriate to ensure compliance with all applicable conditions prior to issuance of a permit to operate an article, machine, equipment, or contrivance, a district may issue a temporary permit to operate. The temporary permit to operate shall specify a reasonable period of time during which the article, machine, equipment, or contrivance may be operated in order for the district to determine whether it will operate in accordance with the conditions specified in the authority to construct.