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] <br /> ] <br /> l <br /> ] <br /> J <br /> J <br /> J <br /> <br /> J <br /> <br />J <br />J <br />J <br /> <br />§ 8.2,0 <br /> <br />13. <br /> <br />The drain_field rock shall completely encase the disposal <br />pipes tn a depth of at least 1 inches. The ~op o£ the drain_field <br />rock in trenches, beds, .nd mounds must be level in all <br />directions. <br /> <br />14. <br /> <br />The filter material sha]] be covered with either a permeable <br />synthetic fabric or a 4 inch layer of compacted hay or straw <br />covered with untreated building paper. Vfhere a drop box <br />distribufiion system is used to ~]l a trench to v~it~n 2 inches <br />of the top of the drain6eld rock, a permeable synthetic fabric <br />must be used t~ cover the dr~n~eld rock. <br /> <br />15. <br /> <br />The trenches or beds shall be bac~SLled with the excavated <br />material and slightly crowned above fun/shed grade to allow <br />for settling. The back,Il shall not be completed to a density <br />greater than that of the original soil. <br /> <br />16. <br /> <br />The rn~n~m~rn depth of cover over the distribution pipes shall <br />be a least 8 inches. The maxim,~rn depth of cover over the <br />distribution pipes shall be no more than 36 inches and <br />preferably no more than 24 inches. <br /> <br />17. A grass cover shall be established by the owner or the <br /> owner's agent over the soil treatment area. <br /> <br />d. DualField S~ter~ <br /> <br />Dual field systems shall be used only where the percolation <br />rate is slower than 5 rn~nutes per inch. <br /> <br /> Dual field systems shml] be sized, designed, and constructed <br /> as set forth above for s*_mndard systems except as follows: <br />a) The soil treatment area shall be divided into two or more <br /> parts. <br />b) AJternating soil treatment areas shall each be <br /> connected to a valve box outlet. <br /> <br />A part of the soil treatment area shall be used no more than <br />one year unJess inspec~on of the effluent level indicates that <br />a longer duration can be used. <br /> <br />Slow]y Permeable <br /> <br />Excavation for the purpose of constructing a soil treatment <br />system must not be made in any soil layer having a <br />percolation rate slower than 120 r~nutes per inch. <br /> <br />Excavation for the purpose of constructing a soil treatment <br />syste~r~ must not be made in a soil layer having a percolation <br />rate slower than 60 rn~nutes per inch un]ess the moisture <br />content is lower than the plastic I~rn~t of the soil. <br /> <br />Printed 12Y28,/90 <br /> <br />Page 253 <br /> <br /> <br />