California Code, Public Resources Code - PRC § 25370

(a) “Planned maintenance” means regular, periodic maintenance or repair of one or more pieces of equipment within a petroleum refinery that may require the shutdown of that equipment, or that may reduce production of a petroleum refinery.

(b) “Price spike” means a rate of increase of a refinery's gross gasoline refining margin, as defined in Section 25355, that is greater than the rate of increase of the average price of crude oil received by the refinery, for the same period of time, or a rate of decrease of a refinery's gross gasoline refining margin that is less than the rate of decrease of the average price of crude oil received by the refinery, for the same period of time.

(c) “Transportation fuels” means gasoline, gasoline blending components, diesel fuel, or renewable fuels.

(d) “Turnaround” has the same meaning as that term is defined in Section 7872 of the Labor Code.

(e) “Unplanned maintenance” means any maintenance or repair that requires the shutdown of any part of the petroleum refinery that will result in any reduction in production that was not scheduled as turnaround or planned maintenance.