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<br />I <br />I <br />1 <br />11 <br />I; <br />I <br />Ii <br />I <br />I" <br /> <br /> <br />;[ <br /> <br />I' <br />I; <br />I: <br />I: <br />I <br />I, <br /> <br /> <br />. <br /> <br />I <br />i <br />. <br />I <br /> <br />SUBDIVISION 4. MOUNDS. <br /> <br />1. Mounds may be constructed on soils having the site or soil conditions specified in Section <br />150.014G. <br /> <br />2. The soil percolation rate in all layers of the natural or fill soil to a depth of at least <br />twenty-four (24) inches below the sand shall be faster than one hundred twenty (120) <br />minutes per inch. <br /> <br />3. The allowable absorption area loading rate must be determined according to Table III by <br />the percolation rate of the 12 inches of original or fill soil immediately under the sand layer. <br /> <br />TABLE III <br /> <br />Percolation rate of original soil <br />under sand layer. minutes <br />6 to 1 5 <br />1 6 to 30 <br />31 to 45 <br />46 to 60 <br />61 to 120 <br /> <br />Allowable absorption area loading rate <br />gallons/day per square feet per <br />square foot gallons per day <br />0.79 1.27 <br />0.60 1.67 <br />0.50 2.00 <br />0.45 2.20 <br />0.24 4.20 <br /> <br />4. Below the sand layer, there shall be at least one (1) layer of soil, either natural or fill, <br />at least twelve (12) inches thick, which has a percolation rate slower than five (5) minutes <br />per inch (loamy sand). <br /> <br />5. Wherever possible, mounds shall be located on flat areas or crest of slopes. Mounds <br />shall not be located on natural slopes of more than three per cent (3%) if the percolation rate is <br />slower than sixty (60) minutes per inch to a depth of at least twenty-four (24) inches below <br />the sand layer. " <br /> <br />6. Mounds shall not be located on slopes exceeding six per cent (6%) if the soil percolation <br />rate is slower than thirty (30) minutes per inch to a depth of at least twenty-four (24) inches <br />below the sand layer. <br /> <br />7. Mounds shall not be located on natural slopes exceeding twelve per cent (12%) under <br />any soil percolation rate conditions. <br /> <br />o <br /> <br />a. The bottom area of the filter material shall be sized on the basis of two hundred (200) <br />square feet per bedroom or eighty-three hundredths (0.a3) square feet per gallon of waste per <br />day. <br /> <br />9. In no case shall the width of the filter material in a single bed exceed ten (10) feet. <br /> <br />10. A rubber tired tractor may be used for plowing or disking, but in no case shall a rubber <br />tired tractor be used after the surface preparation is completed. A crawler or track-type <br />tractor shall be used for mound construction where the soil percolation rate is slower than 15 <br />minutes per inch. <br /> <br />11 . The discharge pipe from the pump to the mound area shall be installed prior to soil <br />surface preparation. The trench shall be carefully backfilled and compacted to prevent seepage <br />of effluent. <br /> <br />5 1 <br />