08-19-2019 Septic Design - Laserfiche WebLink

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Septic System Design Additional Information Property Address: 2080 Salem Ct. Orono, MN Description of Waste Water Treatment System This site is an existing home with a failed septic system due to soil separation. The tanks were deemed Compliant by Kothrade Sewer and Water. There is an existing 1000 gallon septic tank and a 1650 gallon dual compartment tank. This tank has the 650 gallon compartment tank as the pump tank. This compartment will be turned into a septic tank and a new 1250 gallon pump tank must be installed. From the proposed 1250 gallon Brown Precast pump tank(Model #1250ST) effluent will be pumped 40 feet to the existing mound. The existing mound is a 1 -foot sand lift mound with a 10'x53' rockbed. The mound will be stripped of all topsoil and loamy cap and set aside. The existing rockbed and laterals will be torn out and disposed of at the proper location. It is an installers decision on how much existing sand to removed before the mound rebuild. It is estimated there is 125 -150 tons of existing sand. Once the mound is stripped of topsoils and existing rockbed, new sand will be installed to a height of 3 feet. Once 3 feet of clean washed sand is established a new 10'x50' rockbed will be installed with new laterals. The existing topsoil and loamy cap can then be re -used as a loamy cap and new top soil must be hauled in. This new on-site sewage treatment system is designed for a 4 bedroom home, Type 3 system in accordance with the MPCA Chapter 7080 and local ordinances. The soils on this site are loamy and clay loams. The periodically saturated soils were located after going to a depth of 0 inches. This will lead 6 inches of usable soil underneath the mound with a 3 sand lift. Therefore providing a 36 inch separation for the treatment of effluent above the periodically saturated soils. 1-1000 gallon septic tank will need to be re -used along with the re -used of an the existing 1650 gallon septic/pump tank. A new 1250 gallon pump tank will be installed to lift the sewage to the treatment area. The power supply and switches must be located outside the manhole and pumping chamber in a weather proof enclosure. A warning device must also be installed with audio/visual alerts. The supply line must have drain back to the pumping chamber. From the pump tank sewage will be pumped approximately 40 feet to the mound. There will be 3- 2" pipes each 3 feet apart inside the 10' by 50' rockbed. The mound will have a total footprint of 45' by 94' with 5 percent slope underneath it. All tank manholes should be brought to grade upon completion of tank installation, inspection ports for the distribution boxes should also be at grade upon completion. Ende Septic Service, LLC, 24910 Territorial Road I ph.763-428-4489 orinfo(o)endeseotic.com 1