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! <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />! <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br /> <br />or where it can reasonably be anticipated that such vegetation will be <br />present during the expected life of the system, at least twelve (12) <br />inches of filter material shall be placed beneath the distribution <br />pipe. <br /> <br /> 9. Distribution pipe used in trenches or beds for gravity <br />flow distribution shall be at least four (4) inches in diameter and <br />constructed of sound and durable material not subject to corrosion or <br />decay or to loss of strength under continuously wet conditions. <br /> <br />a. Agricultural drain tile shall be in twelve (12) inch <br /> lengths and laid with one-fourth (1/4) inch open <br /> joints on grade boards. Ail open joints shall be <br /> protected on top by strips of asphalt treated build- <br /> ing paper at least ten (10) inches long and three <br /> (3) to six (6) inches wide or by other acceptable <br /> means. <br />c. Other devices may be used to distribute sewage tank <br /> effluent over the soil treatment area upon approval <br /> of the administrator. <br /> <br /> 10. The distribution pipes shall be laid level or on a uniform <br />slope away from the distribution device of no more than four (4) inches <br />per one hundred (100) feet. <br /> <br /> 11. The distribution pipes in beds shall be uniformly spaced <br />no more than five (5) feet apart and not more than thirty (30) inches <br />from the side walls of the bed. <br /> <br /> 12. The filter material shall completely encase the disposal <br />pipes to a depth of at least two (2) inches. <br /> <br /> 13. The filter material shall be covered with untreated build- <br />~ng paper or a two (2) inch layer of hay or straw or similar, approved <br />permeable materials. <br /> <br /> 14. The trenches or beds shall be backfilled with the excava- <br />ted material and slightly crowned above finished grade to allow for <br />settling. The backfill shall not be compacted to a density greater <br />than that of the original soil. <br /> <br /> 15. The m~nimum depth of cover over the distribution pipes <br />shall be at 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 /> <br /> 16. A vegetative cover shall be established over the soil <br />treatment area. <br /> <br />150.014G FINAL TREATb'~N"F AND DISPOSAL - ALTEP~NATIYE SYSTt~t5 <br /> <br />Subd. 1 GENEP,.~, <br /> <br />The contents of this chapter apply to the final treatment and disposal <br />of the effluent of a svs'tem constructed in accordance with Chapter 1~0.014. <br />The intent of t}~J~: c"l-.apFer is to. ?rovide sewage treatment solutions ior' <br /> <br /> <br />