2010-01172 septic - Laserfiche WebLink

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� � S stem O eration: Descri tion of Treatment Process � • Primary Treahnent- Septic Tanks Wastewater gravity flows from the house into a 1,500 gallon septic tank. Gravity flow continues to a second 1,000 gallon septic tank. Within the first tank the �� sewage separates into three distinct zones: a scum layer, a sludge layer, and a clear layer. Liquid from the center or the clear zone of the first tank flows into the � second tank. Additional settling occurs in the second septic tank with a less pronounced sepazation into three zones. � • Final Treatment and Dispersal—Mound Drain Field Effluent from the second septic tank will gravity flow to a 1,000 gallon lift tank. � Effluent will be screened for additional solids removal by passing through an effluent filter prior to discharging to the mound drain field through a high head turbine pump. The effluent is dispersed into the mound through a pressured lateral � piping network. As the effluent trickles down into the sand and underlying soil aerobic biochemical processes remove viruses and bacteria. ., �� Installation Details 1. General � a. Additional specifications are provided in the design worksheets (Appendix � C),materials list(Appendix D) and attached figures. b. The installer of the system must be licensed by the MPCA. � c. All construction and components of this design if not explicitly detailed must conform to the City of Orono On-Site Sewage Treahnent and Disposal Ordinance and Minnesota Rules Chapter 7080. � 2. Septic Tanks , , � a. Required: 1,500 gallon and 1,000 gallon single compartment precast septic tanks. � b. Installation by the contractor will include but not limited to; abandonment of the existing tanks and installation of a new schedule 40 PVC sewer line from the house to the septic tanks. � c. All pipe connections must be watertight. Tanks must have cast in place rubber grommets in the inlet and outlet openings. � d. Install according to manufacturer's recommendations. � � 2