10-05-2018 Septic Design - Laserfiche WebLink

Home Browse Search

Site Evaluation Report for Rydel Homes, Inc. Page 2 Otto Job No. 18-0464 October 5, 2018 9 West Division Street, Buffalo, MN 55313 • 763-682-4727 • Fax 763-682-3522 • www.ottoassociates.com GENERAL INFORMATION: This design is for a Type 1, 5-bedroom home and is in accordance with the Minnesota Pollution Control Agency Standards and Local Ordinances. A seasonally high water table was evidenced at 13 inches of depth in Soil Borings 5A and 6A. The slope is about 7%. All neighboring wells are located more than 100 feet away from the proposed treatment area: NOTES: Keep all heavy equipment off of the proposed treatment area before and after construction as much as possible. The treatment area should be marked off before construction. With proper installation and maintenance this system should have no problem in treating septic effluent effectively. It is recommended that the septic tanks be pumped every 3 years. MOUND SYSTEM: Flow: 5 bedroom = 150 gallon/day/bedroom 150 x 5 = 750 gallons per day (GPD). 750 GPD x 1.00 = 750 square feet. 10 foot wide rock bed 75 feet long = 750 square feet. CONSTRUCTION EQUIPMENT: A rubber-tired tractor may be used for plowing or disking to prepare the soil surface, but in no case shall a rubber-tired tractor be used after the surface preparation is completed. A crawler or tract-type tractor shall be used for mound construction. SOIL SURFACE PREPARATION: The discharge pipe from the pump to the mound area shall be installed prior to soil surface preparation. The trench excavated to install the discharge pipe shall be carefully backfilled and compacted to prevent seepage of effluent. The total area selected for the mound, including that under the dikes, shall be roughened in order to thoroughly break up any existing sod layers and to provide a suitable transition zone between the original soil and sand layer of the mound. The area shall be roughened only when the moisture content of the soil 8 inches below the surface is drier than the plastic limit. Surface preparation or roughening may be performed with a mold board plow, a disk plow, or a back hoe using only the teeth. Mold board plow furrows shall be at least 8 inches deep, shall be thrown up slope and shall run perpendicular to the slope. There shall be no dead furrow under the mound. Disking may be used for surface preparation as a substitute for mold board plowing in soils having percolation rates faster than 15 minutes per inch (sandy loam) in the top 8 inch depth. Backhoe teeth may be used to roughen the soil surface and break up the sod layer. Care must be taken so as to not compact or puddle deeper soil layers. In no case shall any surface soil be excavated and removed from the area. Mound construction shall proceed immediately after surface preparation is completed. Every effort should be taken to prevent rain from falling on the prepared soil surface.