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§ 8.30 <br />S2W3saC dL4I.oS3l SyStnmc I <br />Table III <br />Percolation rate of <br />Percolation rate of <br />Allowable <br />original soil under <br />per square foot <br />absorption area <br />sand layer, <br />gallons/day <br />loading rate square <br />minutes <br />feet per gallons per <br />clay <br />6 to 15 <br />0.79 <br />1.27 <br />16 to 30 <br />0.60 <br />1.67 <br />31 to 45 <br />0.50 <br />2.00 <br />46 to 60 <br />0.45 <br />2.20 <br />61 to 120 <br />024 <br />4.20 <br />4. Below the sand layer, there shall be at least one layer of soil, <br />either natural or fill, at least 12 inches thick, which has a <br />percolation rate slower than 5 minutes- per inch (loamy <br />sand). <br />5. Wherever possible, mounds shall be located on flat areas or <br />crest of slopes. Mounds shall not be located on natural slopes <br />of more than 3% if the percolation rate is slower than 60 <br />minutes per inch to a depth of at least 24 inches below the <br />sand layer. <br />6. Mounds shall not be located on slopes exceeding 6.% if the <br />soil percolation rate is slower than 30 minutes per inch to a <br />depth of at least 24 inches below the sand layer. <br />11 <br />11 <br />LI <br />r1 <br />L <br />LI <br />�i <br />CI <br />CI <br />7. Mounds shall not be located on natural slopes exceeding 12% <br />under any soil percolation rate conditions. <br />8. The bottom area of the filter material shall be sized on the (- <br />basis of 200 square feet per bedroom or 0.83 square feet per L <br />gallon of waste per day. <br />9. In no case shall the width* of the filter material in a single <br />bed exceed 10 feet. <br />10. A rubber tired tractor may be used for plowing or disking, [� <br />but in no case shall a rubber tired tractor be used after the L <br />surface preparation is completed. A crawler or track -type <br />tractor shall be used for mound construction where the soil fi- <br />percolation rate is slower than 15 minutes per inch. L <br />11. The discharge pipe from the pump to the mound area shall <br />be installed. prior to soil surface preparation. The trench <br />shall be carefully backfilled and compacted to prevent <br />seepage of effluent. { <br />12. Soil Surface Preparation. L- <br />a) All vegetation in excess of 4 inches in length and dead <br />organic debris must be removed from the surface of the <br />Printed 12/28/90 ' <br />