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December 17, 2008 <br /> Re: Soil Borings, Percolation Tests, System Design. <br /> We were retained by Robert & Susan Gales to provide criteria for the design and <br /> installation of an on-site sewage system for the property located at 793 Ferndale Road In <br /> the City of Orono. <br /> This design is based on a five bedroom; type one, single family home with maximum <br /> flow of 750 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 1.5 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 Dandas Silt Loam as identified by the Hennepin County soil <br /> map. <br /> The system shall consist of the following; <br /> -Two new 1250 gallon septic tanks <br /> -One new 1250 gallon pump chamber <br /> -623 square feet of rock, bed mound type drainfield <br /> -Length of 86 feet <br /> -Width of 35 feet <br /> Materials needed for the mound construction include: <br /> -Clean washed sand 220 cubic yards <br /> -1.5 foot deep-upslope <br /> -2 feet deep-downslope <br /> -Clean washed rock 24 cubic yards <br /> -Sandy Loam soil af 24 cubic yards <br /> -Top soil of 130 cubic yards <br /> The mound must be pressurized, therefore a pump must be installed that can pump 36 <br /> gallons per minute with a total head of 21 feet. An alarm system must also be installed to <br /> warn of purnp failure. <br /> We recommend installing an effluent filter. It will add life to the system if maintained <br /> properly. <br />