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§ 8.30 <br />r�Sewage dLsposal systems <br />S. Drainfield rock must not be placed in contact with original <br />soil having a percolation rate slower than 60 minutes per <br />inch. <br />4. Vy-here the percolation rate of the original soil is slower than <br />60 minutes per inch., at least 12 inches of fill material having <br />a texture defined as sand must be placed between the <br />drainfield rock and the original soil along the excavation <br />bottom. <br />5. Construction equipment wheels or tracks must not be placed <br />in contact with the bottom of the excavation during the <br />construction of a soil treatment system in soils having a <br />percolation rate slower than 15 minutes per inch. <br />6. The size of the soil treatment system must be based on an t <br />acceptance rate of 0.24 gallons per. square_ foot, which is <br />equivalent to a sizing factor of 4.2 square feet per gallons per <br />day. <br />Subd. 7. Final treatment And disposal - alternative systems. <br />a. General. The contents of this section apply to the final treatment ( <br />and disposal of the effluent of a system constructed in accordance <br />with §8.30.4. 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 I' <br />type of sewage treatment system. <br />b. Muctuatuug groundwater. <br />1. Where natural drainage will not provide 4 feet of separation <br />between the bottom of the soil treatment area and the highest <br />known or calculated level of the water table, agricultural <br />, <br />dram file may be used to intercept or lower the seasonal high <br />water table, except with shorelands of -public, waters. There <br />shall be at least 10 feet of undisturbed soil between the <br />sidewall of the soil treatment unit and the agricultural drain <br />tile. <br />2. Within shorela.nds of public waters, agricultural drain the <br />may be used -to intercept the seasonal high water table, <br />provided the groundwater table has a slope of at least 2 feet <br />per 100 feet toward the public water, and provided the drain <br />tile are installed upslope of the soil treatment system. There <br />shall be at least 20 feet of undisturbed soil between the <br />j <br />sidewall of the soil treatment unit and the agricultural drain <br />L <br />tile. <br />3. In all cases, the greatest practicable vertical separation <br />L <br />distance from the water table shall be pro,.Tided. <br />c . Rapidly permeable soils. <br />'age `?54 <br />o2lA <br />Printed 12/28/90 <br />