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11. The distribution pipes shall be laid level or on a <br />uniform slope away from the distribution device of no more than <br />four (4) inches per one hundred (100) feet. <br />12. The distribution pipes in beds shall be uniformly spaced <br />no more than five (5) feet apart and not more than thirty (30) <br />inches from the side walls of the bed. <br />13. file - drainfielc' -- rack shall completely encase the disposal <br />pipes to a - depth of at least two (2) inches. The top of the <br />drainfield rock in trenches, beds, and mounds must be level in all <br />directions. <br />14. The filter material shall be covered with either a <br />permeable synthetic fabric or a four (4) inch layer of compacted <br />hay or straw covered with untreated building paper. Where a drop <br />box distribution system is used to fill a trench to within two <br />inches, of the top of the drainfield rock, a permeable synthetic <br />fabric must be used to cover the drainfield rock. <br />15. The trenches or beds shall be backfilled with the <br />excavated material and slightly crowned above finished grade to <br />allow for settling. The backfill shall not be completed to a <br />density greater than that of the original soil. <br />16. The minimum depth of cover over the distribution pipes <br />shall be a least eight (8) inches. The maximum depth of cover over <br />the distribution pipes shall be no more than thirty -six (36) inches <br />and preferably no more than twenty -four (24) inches. <br />17. A grass cover shall be established by the owner or the <br />owner's agent over the soil treatment area. <br />Dual Field Systems <br />1. Dual field systems shall be used only where the <br />percolation rate is slower than five minutes per inch. <br />2. Dual field systems shall be sized, designed, and <br />constructed as set forth above for standard systems except as <br />follows: <br />a. The soil treatment area shall be divided into two or more <br />parts <br />b. Alternating soil treatment areas shall each be connected <br />to a valve box outlet. <br />3. A part of the soil treatment area shall be used no more <br />than one year unless inspection of the effluent level indicates <br />that a longer duration can be used. <br />