30 CFR § 71.501
Sanitary toilet facilities; maintenance.
Sanitary toilets provided in accordance with the provisions of
shall be regularly maintained in a clean and
sanitary condition. Holding tanks shall be serviced and cleaned when full
and in no case less than once each week when in use by draining or pumping
or by removing them for cleaning and recharging. Transfer tanks and transfer
equipment, if used, shall be equipped with suitable fittings to permit
complete draining without spillage and allow for the sanitary transportation
of wastes. Waste shall be disposed of in accordance with State and local
laws and regulations.