All boats, scows, and appurtenances thereto used in the taking of shellfish or used in the transportation of shellfish from the beds to plants or used in the water over the shellfish beds shall be kept in such a state of cleanliness and repair that shellfish growing on the bed and handled and stored thereon shall not be subject to contamination. Decks, holds, or bins used for storage and/or transporting of shellfish on boats shall not be washed with polluted water. Persons in boats over the shellfish beds shall not discharge human wastes to the waters. Adequate facilities shall be provided for disposal of human wastes from persons working on the shellfish beds.