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FINAL TREATMENT AND DISPOSAL - ALTERNATIVE SYSTEMS <br /> <br />General <br /> <br />The contents of this section apply to the final treatment and <br />disposal of the effluent of a system constructed in accordance with <br />Section 150.01.4. The intent of this section is to provide sewage <br />treatment solutions for those site or soil conditions where a <br />standard system cannot be installed or is not the most suitable <br />type of sewage treatment system. <br /> <br />Fluctuating Groundwater <br /> <br /> 1. Where natural drainage will not provide four (4) feet of <br />separation between the bottom of the soil treatment area and the <br />highest known or calculated level of the water table, agricultural <br />drain tile may be used to intercept or lower the seasonal high <br />water table, except with shorelands of public waters. There shall <br />be at least ten (10) feet of undisturbed soil between the sidewall <br />of the soil treatment unit and the agricultural drain tile. <br /> <br /> 2. Within shorelands of public waters, agricultural drain <br />tile may be used to intercept the seasonal high water table, <br />provided the groundwater table has a slope of at least two (2) feet <br />per one hundred (100) feet toward the public water, and provided <br />the drain tile are installed upslope of the soil treatment system. <br />There shall be at least twenty (20) feet of undisturbed soil <br />between the sidewall of the soil treatment unit and the <br />agricultural drain tile. <br /> <br /> 3. In all cases, the greatest practicable vertical separation <br />distance from the water table shall be provided. <br /> <br />Rapidly Permeable Soils <br /> <br /> 1. Filter material for a soil treatment unit using gravity <br />distribution of effluent shall not be placed in contact with <br />original soils having a percolation rate faster than one-tenth <br />(0.1) minute per inch. <br /> <br /> 2. For coarse soils having a percolation rate faster than <br />one-tenth (0.1) minute per inch, at least twelve (12) inches of <br />loamy sand textured soil having a percolation rate between six (6) <br />and fifteen (15) minutes per inch at the original site shall be <br />placed between the filter material and the coarse soil along the <br />excavation bottom and sidewalls. The size of the soil treatment <br />system must be based on the required treatment area for a soil <br />having a percolation rate of 16 to 30 minutes per inch as specified <br />in Table II. <br /> <br /> 3. For soils with percolation rates between one-tenth (0.1) <br />and five (5) minutes per inch, at least one of the following <br />treatment techniques shall be used: <br /> <br /> <br />