(a) Capacity. All septic tanks shall have a minimum capacity in accordance with the provisions as set out in subsection (b) hereof.
(b) Minimum Capacities for Septic Tank Serving Individual Dwellings.
Number of Bedrooms | Max. No. Persons Served | Normal Liquid Capacity Tank Gallons | Length Ft. In. | Width Ft. In. | Liquid Depth Ft. In. | Total Depth Ft. In. |
2 or less | 4 | 500 | 6 0 | 3 0 | 4 0 | 5 0 |
3 or 4 | 6 to 8 | 750 | 7 6 | 3 6 | 4 0 | 5 0 |
5 or 6 | 10 to 12 | 1000 | 8 6 | 4 0 | 4 6 | 5 6 |
7 or 8 | 14 to 16 | 1500 | 10 0 | 4 6 | 4 6 | 5 6 |
Note: Liquid capacity is based on number of bedrooms in the dwelling. Total volume in cubic feet includes air space above liquid level.
(c) Multiple Compartments. In a tank of more than one compartment, the inlet compartment shall have a capacity of not less than two-thirds of the total tank capacity.
(d) Garbage Disposal. Where domestic garbage disposal units are installed or contemplated, the capacity of the septic tank shall be at least fifty percent (50%) greater than requirements given in subsection (b) hereof.
(e) Construction. Septic tanks shall be constructed of corrosion-resistant materials, and be of permanent construction. The cover of the tank shall be designed for a dead load of not less than 150 pounds per square foot, and, if of concrete, should be reinforced and not less than four inches thick.
(f) Manholes. The inlet compartment must be provided with one manhole. Other compartments may be provided with a manhole. Manholes shall be at least twenty inches square or twenty-five inches in diameter and provided with covers which can be sealed watertight. Manholes should be extended to grade. Where removable slab covers are provided manholes are not required.
(g) Baffles. If inlet and outlet baffles are used, they shall extend the full width of the tank and be located twelve inches from the end walls. The baffles shall extend twelve inches and outlet baffles fifteen to eighteen inches below the flow line.
(h) Pipe Inlet and Outlet. In lieu of baffles, submerged pipe inlets and outlets may be installed to the required depth indicated in subsection (g) hereof.
(i) Invert. The invert of the inlet pipe shall be located at least three inches above the invert of the outlet.
(j) Dosing Chambers. Dosing chambers are not required in the case of individual disposal systems.
(1973 Code Sec. 51.17 to 51.26)