(1) Toilet facilities. At least one approved chemical toilet shall be provided in the working chamber. Such facilities shall be maintained in a sanitary condition and shall be used by the workers.

(2) Housekeeping. No refuse or discarded material of any kind shall be permitted to accumulate underground. The man lock shall be kept clean.

(3) Drinking water. An ample supply of clean and potable drinking water shall at all times be available in working areas. Where water is supplied in containers it shall be kept covered. The use of common drinking cups is prohibited.