305.1 All plumbing systems, including automatic handwashing fixtures comply with the manufacturers' instructions for design, construction, installation, and maintenance in accordance with the most recent versions of the District of Columbia Construction Codes, as specified in § 102.1(g)(3), and shall be of sufficient size to:
(a) Meet the hot water demands throughout the barber, cosmetology, and personal grooming facility;(b) Properly convey sewage and liquid disposable waste from the premises;(c) Avoid creating any unsanitary condition or constituting a source of contamination to potable water, or cosmetic equipment or instruments;(d) Provide sufficient floor drainage to prevent excessive pooling of water or other disposable waste in all areas where floors are subject to flooding-type cleaning or where normal operations release or discharge water or other liquid waste on the floor; and(e) Meet all potable water demands throughout the barber, cosmetology, and personal grooming facility.