2005-P09159 - new septic system - Laserfiche WebLink

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CONSTKUCTION MATERIALS AND PROCEDURES A minimum of 12" of sand shall be placed level under th��fi�er material. A low ground pressure or track type shal I be used and care must be taken to keep a minimum of 6" sand under the tracks to minimize compac�ion. Sand is defined as a soil texture composed by weight of 95 - 100%passing#4 sieve, 80- 100%passing # 8 sieve, 0- 100% passing# 10 sieve, 0- 100%passing#40 sieve, 0-40%passing#60 sieve, 0- 5% passing# 200 sieve and contain less than 3 %deleterious substances and be free of organic impurities Filter material is defined as clean rock,crushed igneous rock, or similar insoluble, durable and decay resistant inaterial free from dust,sand, silt,or clay.The size shall range from 3/4"to 2 1/2" diameter. PRESSURE DISTRIBUTION Effluent shall be distributed over the filter material by three 1 1/2" diameter perforated pipes under pressure. Perforations shall be 7/32" diameter drilled in a straight line along the length 36" on center. Holes , shall be drilled straight,with a sharp bit and the burrs shall be removed. The holes shall be directed downward. The perforated laterals shall have their ends capped and shall center fed with a 2" manifold with 40" ' center to center spacing and 20" spacing to the edge of the filter material. The 2" forced main from the pump shall be sloped to drain back or shall be buried deep enough to prevent freezing. Geo-Textile material shall be placed over the filter material.A 12" sandy loam cap shall be mounded over the t7tter material.A 6"topsoil cap is applied over the entire mound area so that water is shed frum the area and a good erosion resistant grass cover can be established by the landscaper.No shrubs may be planted on the mound but shrubs or dry footed trees around the perimeter would be beneficial. Whenever mounds are located on slopes,a diversion swale should be employed to intercept and divert runoff. Nothing other than gray water,(laundry, showers,etc.)human waste should enter the system. It should never e�ceed the maximum design flow otherwise the solids and sludge will be flushed on through to the absorption field,plugging the soil. Garbage disposal and powdered soaps add sludge to the tank. Using 1000 flushes or the new antibacterial soaps can have a detrimental effect also. Frequent pumping of the tanks is insuraiice against premature system failure. Under ordinary conditions pump a two-tank system every two years and every year for a one tanlc system. I recommend you either monitor the sludge level or have your septic pumper schedule you for re�;ular routinc maintenance. Funher info on maintenance is available from U of Minn. (WWW BAE UMN.EDU/SEP'fIC/) (WV�'�b.�xtension.UMN.edu/distribution/naturalresources/DD6583.HTML/), MOSTCA(WWW MOSTCA.COM),National Small Flows Clearinghouse (WW\^:'.��td wvu edu/nsfc/nsfchomepa�e.html/),or myself. �.��1�l��i�''1 Brian Van Beusekom President MPCA# 874