(a) At least one curbed cleaning facility or janitorial sink equipped with hot and cold water and a drain shall be provided and conveniently located for the cleaning of mops or similar wet floor cleaning tools and for the disposal of mop water and similar liquid waste.
(b) Restricted food service facilities shall be exempt from subdivision (a) if hot water is available for janitorial purposes and wastewater from janitorial activities is disposed of through an approved sewage disposal system.