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I <br />I <br /> <br />I <br />i <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Sewage <br /> <br />§ 8.80 <br /> <br />13. <br /> <br />14. <br /> <br />15. <br /> <br /> total area selected for the mound, including the area <br /> under the bank~. <br /> b) The total area selected for the mom~d, including the <br /> dikes, shall be plowed to a depth of ,at least 8 inches. <br /> Furrows shall run perpendicular to the direction of <br /> slopes. All furrows shall be thrown uphill and there <br /> shall be no dead furrow under the mound. The soil <br /> shall be plowed only when the moisture content of a <br /> fragment 8 inches below the surface is below the plastic <br /> limit. <br /> c) In soLls having percolation rates faster than 15 minutes <br /> per inch (sandy lo_-ms) in the top 8 inch depth, disking <br /> may be used for surface preparation as a substitute for <br /> plowing. <br />d) Mound construction shall proceed immediately after <br /> surface preparation is Completed. <br />e) The original soil must not be excavated or moved more <br /> than I foot from its original location dm-lng soil surface <br /> preparation. <br /> <br />A rn~nim-m of 12 inches of soil defined as sand shall be <br />placed where the filter material is to be located. A crawler <br />tractor with a blade shall be used to move th,.: sand into place. <br />At least 6 inches of sand shall be kept under the tracks to <br />rn~uim~ze compaction of the plowed layer. The sand layer <br />upon which the filter material is placed shal] be level. <br /> <br />A depth of at least 9 inches of filter materis] shall be placed <br />over the bed area below the distribution pipe. <br /> <br />Distribution of effluent over the filter material shall be 1.25 <br />inch diameter perforated pipe under pressure from a <br />manifold. <br /> <br />16. The quantity of effluent per p,mp dose shall be at least 150 <br /> gallons per bedroom for dwellings. For other <br /> establishments, the dose shall be at least 25% of the <br /> estimated or measured daily sewage flow. <br /> <br />17. At least 2 inches of filter material shall be placed over the <br /> distribution pipes. The top of the filter material shall be level <br /> in all directions. <br /> <br />18. Straw or marsh hay to an uncompacted depth 4 inches shall <br /> be placed over the filter material. <br /> <br />19. Construction vehicles shall not be allowed on the filter <br /> material until backfill is placed. <br /> <br />Printed 1~2S/90 <br /> <br />Page 257 <br /> <br /> <br />