A person may not build a privy unless the privy will, in the judgment of the Department, prevent: The soil from coming in contact with any fecal matter; and Flies from gaining access to any fecal matter. Privies shall be located and constructed so as to prevent contamination of ground and surface water. A privy shall be constructed in such a manner as to be insect and rodent free and to prevent odor nuisances. Location and construction plans shall be approved by the Approving Authority before issuing a sewage disposal construction permit. Chemical toilets shall be constructed of impervious materials, vented to the outside air above the roof line of the structure housing them, and supplied with an adequate amount of the chemical agent used to reduce and deodorize the tank contents. Chemical toilets shall be used only for special term events, construction projects and in the abatement of problems. When privies or chemical toilets become filled to recommended capacity, the owner shall remove the contents and dispose of the sewage in accordance with Regulation 09 of this chapter.