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• <br /> • <br /> • <br /> May 5,2010 <br /> Re: Soil Borings,Percolation Tests, System Design. <br /> We were retained by Ray&Kim Kang to provide criteria for the design and installation <br /> of an on-site sewage system for the property located at 4295 Watertown Rd. in the City <br /> of Orono <br /> This design is based on a three bedroom;type one, single family home with maximum <br /> flow of 450 gallons per day. <br /> A total of 2 soil borings and 2 perc tests were done. From these tests it was determined <br /> that a high water table exists at a depth of 2.2 feet below the ground surface. The high <br /> water table determines that only a mound type drainfield may be installed. <br /> The soils on this site are Kilkenny Loam as identified by the Hennepin County soil map. <br /> The system shall consist of the following; <br /> -Two new 1000 gallon septic tanks <br /> -One new 1000 gallon pump chamber <br /> -410 square feet of rock,bed mound type drainfield <br /> -Upslope length of 61 feet <br /> -Downslope length of 77 feet <br /> -Width of 38 feet <br /> Materials needed for the mound construction include: <br /> -Clean washed sand 130 cubic yards <br /> -1 foot deep-upslope <br /> -1.2 feet deep-downslope <br /> -Clean washed rock 15.2 cubic yards <br /> -Sandy Loam soil of 20 cubic yards <br /> -Top soil of 110 cubic yards <br /> The mound must be pressurized,therefore a pump must be installed that can pump 31 <br /> gallons per minute with a total head of 21 feet. An alarm system must also be installed to <br /> warn of pump failure. <br /> A Tank effluent filter shall be installed to filter effluent and extend the life of the system. <br /> This filter shall be maintained as needed. <br /> All tanks that have less than two feet of cover shall have the lids insulated. <br />