2008-00070 - new septic - Laserfiche WebLink

Home Browse Search

' , the proposed primary and alternate drain fields have a greater depth to redoximorphic features, � allowing for a shallow subsurface drain field. To allow for the shallow subsurface drain field with a vertical separation distance of 1 foot from the , bottom of the drain field trenches to redoximorphic features, peat filters with a 2 foot depth will need to be installed to pre-treat the effluent prior to drain field dispersal. This type of system is ' commonly referred to as a "2 + 1" and is allowed in Minnesota Rules Chapter 7080 as an Other System. E. Descriution of Treatment Process ! • Primary Treatment - Sewage is gravity discharged from the house to a septic tank. Natural � biological activities taking place inside of the septic tank will separate solids and suspended particles. Solids are reduced to some extent through this process. • Secondary Treatment— Effluent from the septic tank gravity flows into the pumping chamber. A ' Biotube� Pump Package pumps filtered effluent to a distribution manifold in the Puraflo Peat Biofilter on a timed basis. Effluent percolates down through the peat media and drains out the ' bottom of the filter pod. The treated effluent flows out of the filter pod to the drain field. Anticipated treatment levels are expected to exceed a 90% reduction of BOD, TSS, total coliforms, and pathogens. � • Final Treatment — Effluent is directed to a new 486 square foot drain field. As the effluent trickles down into the soil biochemical processes remove the few remaining viruses and bacteria. ' F. Description of Treatment Svstem (See figures, design sheets, and manufacturer sheets for additional detail.) � • Septic Tank — (2) 1,000 gallon fiberglass septic tanks. Second tank is a combination 1,000 gallon septic and 500 gallon pump chamber. Install septic tank per manufacturer's � recommendations. • Pump Tank — 500 gallon second compartment of a 1,500 gallon two compartment fiberglass � septic tank. The outlet of the tank will be sealed as the effluent will leave the tank through the riser wall. Install septic tank per manufacturer's recommendations. • Se tic Tank Risers — 24" diameter heavy corrugated PVC pipe. A watertight seal must be ' P created between top of tank and the each riser. • Se tic Tank Riser Cover — 24" diameter fiber lass cover with asket. Tank riser covers should ' P g g include insulation. Do not bury riser cover. , • Pump — Orenco Systems, Inc. Biotube pump vault package with MVP control panel. Effluent pump to be selected to deliver a minimum of 20 gallons per minute with 20 feet of head. Pump ' package includes effluent filter, pump, floats external splice box, and control panel. 2 , ,