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PRIVATE SEWAGE DISPOSAL SYSTEMS
House sewers shall not be less than 4 inches in diameter. The grade shall be at least 1/4 inch per foot for 4-inch sewers and shall not be less than 1/8 inch per foot for larger sizes. House sewers shall be laid with tight joints to a septic tank in a straight line and on a uniform grade except where accessible manholes or surface cleanouts are provided at changes of direction or grade. Pipe for the house sewers shall be of cast iron, with leaded or equal joints, to a point at least 15 feet beyond the foundation wall of any cellar or basement. Portions of house sewers within 74 feet of a well shall be of cast iron with leaded or equal joints, but no portion of the sewer, however constructed, shall be within 25 feet of a well. Greater separating distance may be required for wells with higher rates of pumpage than for residential use. No sewer shall be located within 25 feet of a cellar drain or ground or surface water drain unless the pipe is of cast iron with leaded or equal joints.
('66 Code, § 57-11)
Minimum separating distances between any part of the sewage disposal system and items listed below should be provided as follows:
(A) Well or spring. Greater separating distance may be required for wells with higher rates of pumpage than for residential use - 75 feet
(B) Human habitation other than building served - 50 feet
(C) Building served - 15 feet
(D) Tributary to a water supply or ground or surface water drain tributary to water supply reservoir - 50 feet
(E) Any other stream, pond, lake or tidal water; storm drain, cellar drain, subsoil drain which discharges into a stream, culvert, lake tidal water or onto the surface of the ground unless such drain is cast iron pipe with leaded joints, swimming pool - 25 feet
(F) Top of embankment - 15 feet
(G) Property line - 10 feet
(H) Water pressure line - 10 feet
('66 Code, § 57-12)
(A) A septic tank shall be provided for water-carriage sewage disposal where no public sewer is available. The septic tank shall be constructed with watertight walls and bottom, with inlet baffled or submerged for a depth of 12 to 18 inches and outlet baffled or submerged to a depth of at least 18 inches below the surface of liquid in the tank but not more than half the liquid depth. Baffles shall extend 6 inches above the liquid level. The outlet invert shall be 3 inches lower than the inlet invert. With a 2 compartment tank there shall be adequate connections at mid-depth, and 2/3 or more of the required capacity shall be in the first compartment. A septic tank shall have a removable cover, or manhole, so as to provide access to the tank for purposes of inspection and cleaning. At least 2 manholes shall be provided for a tank more than 10 feet long and at least one manhole per compartment. If a manhole is not located over the inlet, an inspection opening shall be provided at that point. No septic tank shall have a liquid capacity of less than 750 gallons below the outlet invert. The minimum liquid depth of septic tanks shall be 36 inches, measured from the bottom of the invert to the outlet. There shall be a minimum of 8 inches between the liquid level and the underside of the tank cover.
(B) The minimum liquid capacities are as follows:
(1) Two bedrooms, 750 gallons;
(2) Three bedrooms, 900 gallons;
(3) Four bedrooms, 1,200 gallons;
(4) Larger sizes, add 250 gallons per bedroom.
(5) Where additional capacity is needed, 2 tanks may be used in series for one installation. No more than 2 tanks shall be installed in series but larger tanks shall be used to make up the required capacity.
(C) If a garbage disposal system is used in connection with a septic tank, 50% more liquid volume shall be required for the septic tank.
(D) Sink drainage or laundry water systems, where no water-flush toilet fixtures are connected, shall be constructed with a septic tank and seepage system at least 1/2 the capacity specified for usual house sewerage systems.
('66 Code, § 57-13)
Distribution box of sufficient size to accommodate the necessary field lateral lines shall be constructed at the head of each disposal field:
(A) Each field lateral line shall be connected separately to the distribution box and shall not be subdivided.
(B) The invert of all outlets shall be level, and the inlet invert shall be at least one inch above the outlets.
(C) If the level of the outlet inverts is less than 4 inches above the floor of the box, distribution baffles shall be provided. Note: If the level of the outlet inverts is from 4 to 6 inches above the floor of the box, permitting water retention to act in lieu of a baffle, the baffles will not be required. The level of the outlet inverts should not be more than 6 inches above the floor of the distribution box.
('66 Code, § 57-14)
(A) Disposal of septic tank effluent may be by means of tile or other accepted distributing pipe laid in screened gravel or broken stone, or by means of leaching cesspools. Seepage systems shall not be located in fill placed over impervious soil.
(B) Leaching cesspools may be preferable where the amount of area is limited or where porous soil is at a greater depth than can be secured by tile fields. They are not recommended where ground water may interfere with their operation, or where soil of better seepage quality is found at shallow depth. Leaching cesspools shall not extend to rock.
('66 Code, § 57-15)
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