(a) Each recreational vehicle sanitation station shall be provided with a drain inlet not less than four (4) inches in diameter, discharging into a trap not more than twenty-four (24) inches below the drain inlet. The drain inlet shall be equipped with a hinged cover, which shall effectively close the drain inlet when not in use.

(b) Each drain inlet shall discharge into a drainage lateral not less than four (4) inches in diameter connected to a public sewer or private sewage disposal system.

(c) The drain inlet of each recreational vehicle sanitation station shall be set in a concrete drain receptor not less than three and one-half (3 ½ ) inches in thickness and not less than two (2) feet horizontally from the drain inlet to the inside of the surrounding curb. The surrounding curb shall be at least four (4) inches wide and two (2) inches above the floor of the receptor. The inside surface of the drain receptor shall be smooth finished concrete and shall slope a minimum of one-fourth ( ¼ ) inch per foot from the bottom of the curb to the lip of the drain inlet.

(d) A three-quarter ( ¾ ) inch water hose connection shall be installed at each recreational vehicle sanitation station to allow connection of a hose for wash-down operation. A listed and approved backflow preventing vacuum breaker shall be permanently installed in the water service pipe at least six (6) inches above the highest point of usage. Provisions shall be made to store the wash-down hose off the ground.

(e) A sign providing operating instructions shall be posted at all recreational vehicle sanitation stations.