Agenda - Council - 02/28/1984 - Laserfiche WebLink

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I I '1 I I I I I - 16 - 5. The bottom and sides of the trench or bed excavation to the level of the filter material shall be scarified to remove smears left by the construction equipment and footprints. Ail loose material shall be removed from the excavation. The bottom of the excavation' shall not be driven on or walked on after scarification. 6. When the soil percolation 'rate at the bottom of the trench or bed is slower than fifteen (15) minutes per inch, no vehicle or excavation equipment shall be allowed on the trench or bed area~ Excavation sh~ll be by back hoe or other means that allow the equipment wheels or tracks to remain on the surface soil. 7. There shall be a layer of at least six (6), but no m~re than twenty-four (24) inches of filter material in the bottom of the trenches and beds. 8. Where disposal trenches are constructed within ten (10) feet of trees six (6) inches or larger in diemaster, or dense shrubbery, or where it can reasonably be anticipated that such ~getation will be present during the expected life of the system, at least twelve (12) inches of filter material shall be placed beneath the distribution pipe. 9. Distribution pipe used in trenches or beds for gravity flow distribution shall be at least four (4) inches in diameter and constructed of sound and durable material not subject to corrosion or decay or to loss of strength under continuously w~t conditions. I I I as bt Agricultural drain tile shall be in twelve (12) inch lengths and laid with one-fourth (1/4) inch open joints on grade boards. Ail open joints shall be protected on top by strips of asphalt treated building paper at least ten (10) inches long and three (3) to six (6) inches wide or by other acceptable means. Other devices may be used to distribute sewage tank effluent over the soil treatment area upon approval of the administrator. I I 10. Distribution pipes used in trenches or beds for pressure distribution shall be at least one inch in diameter and constructed of sound and durable material not subject to corrosion or decay or to loss of strength under continuously wet conditions. a. Perforations shall be s~zed and spaced as shown in Table I. I I I i 11. The distribution pipes shall be laid level or on a uniform slope away from the distribution device of no more than four (4) inches per one hundred (100) feet. 12. Gravity distribution pipes in beds shall be uniformly spaced no more than five (5) feet apart and not more than thirty (30) inches from the side walls of the bed. 13. The filter material shall completely encase the disposal pipes to a depth of at least two (2) inches.