567—69.13 (455B) Requirements for impervious vault toilets. All impervious vault toilets hereafter constructed or required by the administrative authority to be reconstructed shall comply with the following requirements:
	 69.13(1) Location. Impervious vault toilets shall be located in accordance with the distances given in Table I, rule 69.3(455B) for the closed portion of the treatment system.
	 69.13(2) Construction. The vault shall be constructed of reinforced, impervious concrete at least 4 inches thick. The superstructure including floor slab, seat, seat cover, riser and building shall comply with good design and construction practices to provide permanent safe, sanitary facilities. The vault shall be provided with a cleanout opening fitted with a fly-tight cover.
	 69.13(3) Disposal. Wastewater from impervious vault toilets shall be disposed of at a public sewage treatment facility.