2010-01172 septic - Laserfiche WebLink

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� � from freezing. Recommend using 2' x 8' sections of 2" thick polystyrene insulation centered over pipe. � In addition to the information provided here the City of Orono Code requires the following and must be followed by the contractor: � Pumping stations.In order to standardize installation and electrical connection methods, the following pumping station requirements must be met in addition to Minnesota Rules chapter 7080: � Electrical connection. i. A watertight, lockable electrical box must be mounted on a four-inch-by four-inch treated redwood or cedar post. � ii. All electrical connections shall be made within the box.Pump connection must not be made using a direct line(plug-in only). Wire entry to the electrical box shall be sealed with a watenight material such as foam or putty. � iii. Alarm and pump floats shall be on separate electrical circuits. iv. Electrical wire from the power supply must not run over any tanks but must be laid beside the � tanks and placed in conduit along the electrical post. v. Electrical cords from the pump and floats must be run through a rivo-inch PVC(or equivalent)conduit(schedule 80)with a one-inch gap between the conduit and the electrical � box.Electrical cords must not run through or under the manhole cover. Wires must not have ground contact. Pumping chamber. � i. Pressure pipe exiting the pumping chamber must be laid on a uniform slope up to the soil treatment area for proper drain back. The pressure pipe must be sleeved inside a larQer diameter pine for additional support ifspanningeround that has been excavated.If the pipe � at the tank must be lower than union to get elevation for drain back, a one-quarter-inch weep hole must be used. ii. When the soil depth above the pressure distribution pipe is less than 3 1/2 feet, insulation � must be added to achieve an insulating factor egual to 3 1/2 feet of soil to decrease the potential for jreezing(Styrofoam or concentric piping are acceptable methods).Piping under hardcover,such as tennis courts or driveways,shall be insulated pipe or equivalent. iii. A reserve capacity egualing 75 percent of the anticipated daily flow must be allowed in the pumping chamber beriveen the alarm activatBon level and the pump tank inlet. 1 1 � Limitations - Our investigation, layout, design and recommendations aze based on data submitted. If � conditions considerably different from those described in this report are encountered, we should be called to observe the conditions. If proposed construction is changed, we must be notified to evaluate the effect of the changes on the wastewater system. � � . � � 5