(A) Properties of the soil profile of each site shall be evaluated using guidelines as set forth in the soil manuals and handbooks of the Soil Conservation Service, U.S. Department of Agriculture, and where necessary by percolation tests conducted in accordance with the provisions of this chapter. If soil profile observations are used to determine site feasibility, the following table shall be used to determine the absorption system size.
Table III: Data for Determining Square Feet of Absorption Area Needed Per Bedroom for Absorption Trenches Using Soil Analysis Figures | |
Permeability Rating | Square Feet Needed in Trench Bottom Per Bedroom |
More than 6 inches per hour | 165 sq. ft. per bedroom |
1 inch to 6 inches per hour | 250 sq. ft. per bedroom |
1 inch to 2 inches per hour | 330 sq. ft. per bedroom |
Less than 1 inch per hour | Unsuitable for absorption field |
(B) Subsurface absorption fields shall not be constructed in soils rated as having severe or very severe limitations for subsurface sewage disposal by the Soil Conservation Service, U.S. Department of Agriculture, unless that limitation is not present as shown by field investigation or can be overcome. Examples of such severe or very severe limitations are soils with a seasonal high ground water level, bed rock, or where a limiting layer exists within three feet of the proposed trench bottom. A greater vertical distance is desirable and may be required where aquifers are in danger of contamination.
(C) No absorption field lateral shall be installed in unstable ground such as unconsolidated fill.
(D) Roof, foundation and storm water drains shall not discharge into, nor upon, subsurface absorption systems.
(E) There shall be no construction of any kind, including driveways covering any portion of a residential sewage disposal system. The connecting sewers between the house and the septic tank (building sewer), the septic tank and the distribution box and the distribution box and the absorption lines may be installed under driveways if the sewer is constructed of cast iron.
(F) Installation of private sewage disposal systems which may be subjected to traffic or heavy construction vehicles shall not be started until such traffic has completed its final purpose, or until a definite route has been established whereby such traffic will not travel over the system.
(1982 Code, § 91.07) (Ord. passed 1-13-1967; Ord. passed 1-22-1979; Ord. passed 4-29-1985; Ord. passed 11-17-1986) Penalty, see § 53.99