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SEWAGE DISPOSAL (CONTINUED) <br />FINAL TREATMENT AND DISPOSAL - ALTERNAT1VE SYSTEMS <br />General <br />The contents of this section apply to the final treatment and <br />disposal of the effluent of a system constructed in accordance <br />with Section 150.01.4. The intent of this section is to provide <br />sewage treatment solutions for those site or soil conditions <br />where a standard system cannot be installed or is not the most <br />suitable type of sewage treatment system. <br />Fluctuating Groundwater <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, <br />agricultural drain tile may be used to intercept or lower the <br />seasonal high water table, except within shorelands of public <br />waters. There shall be at leastten (10) feet of undisturbed soil <br />between the sidewall of the soil treatment unit and the <br />agricultural drain tile. <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) <br />feet per one hundred (100) feet toward the public water, and <br />provided the drain tile are installed upslope of the soil <br />treatment system. There shall be at least twenty (20) feet of <br />undisturbed soil between the sidewall of the soil treatment unit <br />and the agricultural drain tile. <br />3. In all cases, the greatest practicable vertical <br />separation distance from the water table shall be provided. <br />Rapidly Permeable Soils <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 -half <br />(1/2) minute per inch. <br />2. For coarse soils having a percolation rate faster than <br />one -half (1/2) minute per inch, at least six (6) inches of sandy <br />loam textured soil having a percolation rate between five (5) and <br />fifteen (15) minutes per inch after placement (loamy sand to <br />sandy loam) shall be placed between the filter material and the <br />coarse soil along the excavation bottom and sidewalls. <br />3. For soils with percolation rates between one -half (1/2) <br />and five (5) minutes per inch, at least one (1) of the following <br />treatment techniques shall be used: <br />1 <br />1 <br />1 <br />1 <br />