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TO; <br />FROM; <br />DATE; <br />Jeanne Mabusth, Zoning Administrator <br />Michael P. Gaffron, On-Site Systems Manager <br />November 6, 1980 <br />SUBJECT; Subdivision #588, Lindgren Properties <br />Septic/Soils Testing <br />I have reviewed the soil testing information performed by Hickok and <br />Associates and submitted by Gary Lindgren and wish to make the following <br />comments; <br />Lot 1 - West 10 acres <br />Full testing was done on this lot. Soils indicated were clayey loam, <br />silty clay, and clay. The Hennepin County Soil Survey indicates this <br />is a Kilkenny loam which is normally expectant to have a seasonal water <br />table below 5* and percolation rates in excess of 100 mpi. The average <br />percolation rate was determined by Hickok to be about 43 mpi on this <br />lot with mottling indicating seasonal saturation at a depth of 4.7'. <br />This lot appears to meet the criteria for a standard trench drainfield <br />system. <br />Lot 2 - East 10 acres <br />Full testing was done. Heavier clay layers apparently were found near <br />the surface. Percolation rates averaged 126 mpi for the entire tested <br />area, although rates ranged from 33.6 to 360 mpi. Mottling indicated <br />seasonal saturation at 5.5'. The 126 mpi percolation rate is too slow <br />by Orono Code and State WPC-40 recommendation for installation of a <br />septic system. I recommend disapproval of this lot as a building site <br />at this time. Should the developer wish to have additional testing <br />performed, he should do it as soon as possible. I have talked to Rod <br />Cole of Hickok and Associates about the poor soils on the site and he feels <br />additional testing may find an area suitable for a mound system. Orono <br />Code' also requires that where an innovative system is indicated for use <br />in certain lots of a subdivision, a specific system design must accompany <br />the application. <br />Summary <br />Lot 1 should be acceptable for a standard trench drainfield system. <br />Lot 2 does not meet code requirements for a drainfield system. The <br />developer may wish to re-test and submit a design for an innovative <br />system should a more acceptable site be found.