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<br /> <br />36 <br /> <br /> 2. Within shore lands of public waters, drain tile may be <br />used to intercept the seasonal high water table <br />provided the ground water table has a slope of at least <br />2 ft per 100 ft toward the public water and provided the <br />drain tile is installed up-slope of the soil treatment <br />system. There shall be at least 20 ft of undisturbed <br />soil between the side-wall of the soil treatment unit and <br />the agricultural drain tile. <br /> <br /> 3. In all cases the greatest practical vertical separation <br />distance from the water table shall be provided. <br /> <br /> c. Bedrock proximity – In no case shall filter material of the <br />soil treatment system be placed closer than 30 inches to <br />creviced bedrock or to consolidated permeable bedrock. <br />When all horizons of the original soil profile have <br />percolation rates slower than 60 minutes per inch, filter <br />material of the soil treatment system shall be placed no <br />closer than 7 ft to consolidated impermeable bedrock. A <br />maximum depth of 24 inches of sand may be used under <br />the filter material. Where additional fill is required to <br />achieve the required separation distance, a soil having a <br />percolation rate between 5 and 45 minutes per inch <br />(loamy sand to silt loam) 12 months after placement shall <br />be used. If it is not possible to allow the soil to settle for <br />12 months after placement, mechanical methods may be <br />used to settle the fill to within 10% of its in situ density. <br /> <br /> d. Slowly permeable soils <br /> <br /> 1. In no case shall excavation for the purpose of <br />constructing a soil treatment system be made in any <br />soil layer having a percolation rate slower than 120 <br />minutes per inch. <br /> <br /> 2. In no case shall excavation for the purpose of <br />constructing a soil treatment system be made in a soil <br />layer having a percolation rate slower than 60 minutes