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I <br /> I <br /> 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 /> <br />§ 8..°,0 <br /> <br />13. The drainfield rock shall completely encase the disposal <br /> pipes to a depth of at least 1 inches. The top of the drainfield <br /> rock in trenches, beds, and mounds must be level in all <br /> directions. <br /> <br />14. The filter material shall 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. Where a drop box <br /> distribution system is used to ~ill a trench f;o within 2 inches <br /> of the top of the drainfield rock, a permeable synthetic fabric <br /> must be used to cover the dr~in~eld rock. <br /> <br />15. The trenches or beds shall be backf~lled with the excavated <br /> material and slightly crowned above finished grade to allow <br /> for settling. The backfill shall not be completed to a density <br /> greater th~ that of the original soil. <br /> <br />16. The rn~nimum 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 <br /> owner's agent over the soil treatment area. <br /> <br />d. DuaIField Sys~m-~ <br /> <br />owner or the <br /> <br />1. Dual field systems shall be used only where the percolation <br /> rate is slower than 5 minutes per inch. <br /> <br />2. Dual field systems shall be sized, designed, and constructed <br /> as set forth above for st~udard systems except as foIlows: <br /> a) The soil treatment area sh~ll be divided into two or more <br /> parts. <br /> b) Alternating soil treatment areas shall each be <br /> connected to a valve box outlet. <br /> <br />3. A part of the soil treatment area shall be used no more than <br /> one year unless inspection of the effluent level indicates that <br /> a longer duration can be used. <br /> <br />Slowly Permeable Sofia <br /> <br />1. 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 minutes per inch. <br /> <br />2. Excavation for the purpose of constructing a soil treatment <br /> system must not be made in a soil layer having a percolation <br /> rate slower than 60 minutes per inch un]ess the moisture <br /> content is lower than the plastic limit of the soil. <br /> <br />Printed 12/28/90 <br /> <br />Page 253 <br /> <br /> <br />