1978-06-07 Septic System Design - Laserfiche WebLink

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Feature The ordinary High Water Mark of: Natural Environment Lakes and Streams Recreational Development Lakes and Rivers mineral Development Lakes and Streams Wild River Scenic River Set back distance in feet 150'* 75'* 501 * 150'* 100'* Designated Tributaries of Wild, Scenic, and 75' Recreational Rivers Wetlands lbI * Required for new developments and where practicable, for eAisting developments. 3. DESIGN AND CONSTRUCTION A. The bottom of trenches and beds shall be .it �hiroe feet above the seasonal high water table or bedrick. B. the bottom of the trench or bed excavation shall be level. The bottom and sides of th- trench or bed excavation to the level of the top of the filter material sr,.,l be scarified to remove smears left by the construction equipment an 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. C. When the Soil perculjtion rate at the bottom of the trench or bpd is slower than 15 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. D. There shall be a layer of 6 inches of filter material in the bottom of the trenches and beds placed as shown on the detail. Trenches closer than 10 feet to trees, 6 inches or larger, shall have 12 inches of filter material in the bottom of the trench beneath the distribution pipe. E. Distribution pipe used in trenches or beds for gravity flow distribution shall be at least four inches in diameter and constructea of sound and durable materials not subject to corrosion or decay or to loss of strenqth under continuo-isly wet conditions. The ends of each lateral shall be capped.