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-46 <br />{ 6. <br />In no case shall the width of'the filter material <br />in a single bed exceed ten feet. <br />. <br />7. <br />A rubber tired tractor may be used for plowing or <br />disking but in no•case shall a rubber tired tractor <br />be used after the surface preparation is completed. <br />A _crawler—or track:_typ_e -_tractor_-shall-be used for <br />1 ' <br />mound construction. <br />;! 8. <br />The discharge pipe from the pump to the mound area <br />shall be installed prior to soil'surface preparation. <br />The trench shall be carefully backfilled and compacted <br />� <br />o <br />to prevent seepage of effluent. <br />- <br />a 9. <br />Soil Surface Preparation: <br />t -- <br />(a) The total area selected for the mound,, including <br />jf <br />the dikes shall be plowed with•a mold board plow to <br />a depth of -at least eight 'inches. Furrows shall <br />run perpendicular to the direction of slope. All <br />[ <br />frrows shall be -thrown uphill and there•shall be <br />no dead furrow under the mound. The soil shall be <br />;- <br />plowed only when the moisture content of a <br />;[ <br />fragment eight inches below the surface is below <br />• <br />the plastic limit. <br />j(b) <br />'In soilspercolation rates faster than <br />` t <br />.having <br />15 minutes per inch (sandy loam) in the top <br />eight inch depth, disking may be used for <br />surface preparation as a substitute for plowing. <br />(c) Mound construction shall proceed immediately <br />after surface preparation is completed. <br />E- 10. <br />A minimum of twelve -inches of soil defined as sand shall <br />be.placed where the filter material is to -be located. <br />" <br />A crawler tractor with a blade shall be used to move <br />the sand into place. At least six inches of sand <br />shall be kept under the tracks to minimize compaction <br />of the plowed layer. The sand layer upon which the <br />.filter• material ,is placed shall be, level. <br />11. <br />A depth of at least nine inches of•filter material shall <br />.be placed over the bed area below the distribution <br />-pipe. <br />-46 <br />