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§ 8.30 Table Percolation rate 6f Percolation rate'o~ Allo~/ab'le or~g~naJ soil under per square foot absorption area sand layer, gallons/day loading rate square minutes feet per gallons per day.. '6 to '15 0~79 1.27 16 to 30 ..... 0.60 1.67 ..... 81 to 45 0.50 '~.00 46 to 60 0.45 2.20 61 to~12~ .... 0.24 "' 4.2(5 -11. 4. Below the sa_nd layer, there shall be at least one layer of soil, either natural or fill, at least 12 inches thick, which has a percolation rate slower than 5 minutes-per inch (loamy sand). 5. Wherever possible, mounds shall be located on fiat areas or crest of slopes. ]Vfotmds shall not be located on natural slopes of more than 3% if the percolation rate is slower than 60 re{cutes per inch to a depth of at least 24 inches below the sand layer. 6. Mounds shall not be located on slopes exceeding 6.% if the soil percolation rate is slower than 30 nzinutes per inch to a depth of at least 24 inches below the sand layer. 7. Mounds shall not be located on natural slopes exceeding 12% under any soil percolalion rate con~tions. 8. The bottom area of the filter material shall be sized on the basis of 200 square feet per bedroom or 0.83 square feet per gallon of waste per day. 9. In no case shall the width' of the filter 'material in a single bed exceed 10 feet. I0. A rubber tired tractor may be used for plo',~ing or disldng, but in no case shall a rubber tired tractor be used after the surface preparation is completed. A crawler or track-type tractor shall be used for mound construction where the soil percolation rate is slower than 15 nminutes per Luch. The discharge pipe from the p,mp to the mound area shall be instal-led, prior to soil surface preparation. The trench shall be carefully backfilled and compacted to prevent seepage of effluent. 12. Soil Surface Preparation. a) All vegetation in excess of 4 inches in length and dead organic debris must be removed from the surface of the Page 256 Printed 12/28/90