Ordinance - #84-02 - 02/28/1984 - Laserfiche WebLink

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- 16 - 5. Soil treatment areas shall not be placed in flood plains delineated by local ordinances adopted in compliance with the Statewide Standards and Criteria for Management of Flood Plain Areas of Minnesota (Minn. Reg. NE 85-93), or in areas for which regional flood information is available from the Department of Natural Resources. Subd. 3 DESIGN AND CONSTRUCTION 1. The bottom of trenches and beds shall be at least four (4) feet above the water table or bedrock. 2. The trenches shall be not less than eighteen (18) inches, nor more than thirty-six (36) inches wide. Any trench wider than thirty-six (36) inches shall be considered a bed. 3. Trenches and beds shall be not more than one hundred (100) feet in length. 4. The bottom of the trench or bed excavation shall be level. 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. All 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 thesoil(15)percolation rate at the bottom of the trench or bed is slower than fifteen minutes per inch, no vehicle or excavation equipment shall be allowed on the trench or bed area. Excavation shall 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 last six (6), but no more 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 diameter, or dense shrubbery, or where it can reasonably be anticipted that such vegetation 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 wet conditions. Agricultural drain tile shall be in twelve (12) inch lengths and laid with one-fourth (1/4) inch open joints on grade boards. All 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.