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Page 5 <br /> June 11 1999 <br /> Re: Soil Boreings, Percolation Tests, System Design. <br /> We were retained by Charles & Rosemay Carodenuto to provide criteria for the design and <br /> instailation of an on-site sewage system for the property located at 2375 Devin Ln. In the City of <br /> Orono <br /> The existing system is not large enough to haldle the increased volume of sewage due in part to <br /> the addition of bedrooms to the home. Therefore the existing drainfield will have to be <br /> abandoned and a new system installed. <br /> � After many borings in this property, it has been determined that there is only one site that can be <br /> used to install a conventional system. This site is the original alternate site as proposed when <br /> the house was built. Unfortunately the well was drilled in this location. <br /> To comply with ciry ordinances, the only solution to this problem is to abandon the existing well <br /> and drill a new one in a different location. This wiil allow the use of the original altenate site to <br /> be used for the new septic system. <br /> This design is based on a Five bedroom, type one, single family home with maximum flow of <br /> 750 galions per day. <br /> A total of 3 soil borings and 2 perc tests were done. From these tests it was determined that a <br /> high water table exists at a depth of 25 to 30 inches below the ground surface. The high water <br /> table determines that only a mound type drainfield may be instailed, to meet with code. <br /> The soils on this site are Lester Loam LrB, 2 to 6 % Slope as identified by the Hennepin County <br /> soil map. <br /> The system shall consist of the following: <br /> -Possibie use of the two existing 1000 ga�lon septic tanks <br /> -One new 1000 gallon septic tanks <br /> --One new 1500 gallon pump chamber <br /> -690 square feet of rock bed, mound type drainfield <br /> -Upslope length of 89 feet <br /> -Width of 39 feet <br /> Materials needed for the mound construction include: <br /> -Clean washed sand 140 cubic yards <br /> -1 foot deep upslope <br /> -1.6 feet deep-downslope <br /> -Clean washed rock, 26 cubic yards <br /> -Sandy Loam soil, 33 cubic yards <br /> -Top soil, 110 cubic yards <br /> The mound must be pressurized, therefore a pump must be installed that can pump 51 gallons <br /> per minute with a total head of 30.4 feet. P,n alarm system must also be installed to warn of <br /> pump failure. <br /> The entire area that is to be used for the drainfield shall be protected from any traffic to prevent <br /> any compaction prior to and during cor,struction. Failure to do so shail result in this design <br />