Laserfiche WebLink
Mr. Chuck VanEeckhout <br />Page 3 <br />March 6, 1986 <br />The pressure distribution system of the mound consists of Schedule 40 <br />PVC plastic pipe. The supply pipe should slope back towards the <br />pumping chamber so that it drains after the mound is dosed. The <br />laterals are 1.5 inch inside diameter pipes. The laterals should have <br />1/4 inch diameter holes drilled at a spacing of 3.0 feet. The <br />laterals should be assembled to the manifold so that the holes point <br />downwards into the rock bed. The distal ends of the laterals should <br />be capped. Also, the last hole in each lateral should be drilled <br />horizontally in the end cap near the crown of the pipe to facilitate <br />air venting. "? <br />A submersible effluent pump capable of delivering at least 3 <br />gallons per minute against a total dynamic head of at leas 15.7 <br />should be selected. Headlosses are calculated as follows: <br />1. Vertical headloss of 10.0 feet between pump discharge (approx.„ <br />elev. 101.0) and manifold (approx. elev. 111.0) <br />2. Friction loss of 0.7 feet in 30 feet of supply pipe (2.35 feet <br />per 100 feet 2.0 inch I.D. plastic pipe at 37.5 gpm flow), <br />3. Five feet (5.0) to account for losses in distribution network. <br />If as -built elevations are different from those above, headloss should <br />be recalculated to ensure proper pump selection. <br />The pump should be rigged with mercury float switches to dose about <br />150 gallons of effluent to the mound. An additional mercury float <br />switch should be installed on a separate circuit to an alarm device to <br />warn of pump failure. The mercury switches should be rigged to allow <br />600 gallons reserve capacity in the pumping chamber. All electrical <br />connections should be watertight. <br />The first septic tank should have at least 1,250 gallons capacity. / <br />The second septic tank should have at least 1,000 gallons capacity. -Oor <br />The pumping chamber should have at least 1,000 gallons capacity. <br />It is highly recommended that the installer of this septic system <br />holds an Individual Sewage Treatment Systems Certificate for installa- <br />tion issued by the Minnesota Pollution Control Agency. <br />The sole purpose of soils data contained herein is evaluation of soil <br />suitability for on -site absorption of septic tank effluent at the test <br />site. Although soil texture and horizonation information and <br />groundwater elevation data may be helpful for the setting of basement <br />elevations at this site, we cannot warrant any such interpretations or <br />use of this data for other purposes. <br />0 <br />