This chapter applies to the permitting of all small residential rooftop solar energy systems in the city. Small residential rooftop solar energy systems legally established or permitted prior to the effective date of this chapter are not subject to the requirements of this chapter unless physical modifications or alterations are undertaken that materially change the size, type, or components of a small rooftop solar energy system in such a way as to require a new permit. Routine operation and maintenance shall not require a permit. (Ord. 656 §1, 2015).