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March 1 2003 <br /> Revised July 23, 2012 <br /> Re: Soil Borings, Percolation Tests, System Design. <br /> We were retained by Rachel Brady to provide criteria for the design and instailation of an <br /> on-site sewage system for the property located at 424 Deborah Dr in the City of Orono <br /> This design is based on a four bedroom;type one, single family home with m�imum <br /> flow of 600 gallons per day. <br /> A total of 6 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 30 to 34 inches below the ground surface_ T'he <br /> hi�h water table determines that only a mound type drainfield may be installed. <br /> The soils on this site are Hamel Lc�am as identified by the Hennepin County soil map. <br /> The system sha11�onsist of the following; <br /> -One new 1500 gailan septic tank. <br /> -One New l 250 ga:llon septic tank. <br /> -One new 1250 galion pump chamber <br /> -550 square feet of rock, bed mound type drainfield. <br /> -Upslope length of 79 feet <br /> -Downslope length of 95 feet <br /> -Width of 41 feet <br /> Materials needed for the mound canstruction include: <br /> -Clean washed sand 170 cubic yards <br /> -1 foot deep-upsl4pe <br /> -l.b feet deep-downslope <br /> -Clean washed rack 21 cubic yards <br /> -Sandy Loam soil af 25 cubic yards <br /> -Top soil of 140 cubic yards <br /> T'he mound must be pressurized,therefore a pump must be installed that can pump 42 <br /> gallons per minute wiih a total head of 42 feet. 1�n alaxm systern must also be installed to <br /> warn of pump failure. <br /> A T'�ank efIluent filter shall lled to fiiter eii�iuent�d�extend the life�ke system. <br /> Thi �s-f�i t�er shali be maintain��.�s naeeded. � � <br /> � � �'� `— � ti`^P A s s .� l� -4-0 <br /> 5�--� �� w i�re -�-o <br /> ,� I a �wi �'3 c�X <br /> ��� � � . <br />