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<br /> TO: Jeanne A. Mabusth, Zoning Administrator
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<br /> � �:_�
<br /> �'� n .
<br /> FROM: Michael P. Gaffron, Septic System Inspector
<br /> ��`2=`�`'' DATE: January 5, 1982
<br /> SUBJECT: Ringer Subdivision, North Willow Drive #615
<br /> Summary: All proposed lots were found to have hi�h water tables,
<br /> necessitating the use of mound systems. Percolation rates in the
<br /> upper soil profile generally were suitable for mound systems,
<br /> with slower rates found in deeper test holes. Slopes on th� entire
<br /> site are fairly level and suited for mour..� systems.
<br /> Tris report will consist of: a) a short review of each lot of the
<br /> � i`� �";r proposed division and b) a discussion of mound systems, including s
<br /> � ;��` now and why they work and their current and future use as part of
<br /> s ���;� a � '
<br /> � ,,, �; Orono s �and use mar.agement plan. The Ringer subdivision �_s
<br /> �� J�,{'�� perhaps the most extensive development in Orono to date that will
<br /> t`t;"�.
<br /> require all mound systems.
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<br /> �,,��., A. Ringer Subdivision �
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<br /> �{ "'?� A preliminary review of the Hennepin County Soil Survey indicated
<br /> ���;�'y;: extensive areas of Cordova silty clay loam and Shorewood silty
<br /> � �,� clay loam as well as Leseur l�am would be found at this site.
<br /> ,� � These soils all would be expected to have a seasonal water table
<br /> L"� or saturation zone between 1 and 3 feet below the surface.
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<br /> ` k� During the course of the soils investiqation, Imet with the site
<br /> �� evaluator, Carl Borg, and realtor -Graydon McCulley on the
<br /> '�.�,,x,< site. We made a boring which definitely indicated these high �
<br /> i,u4,"
<br /> � water table soils were present. I l�ter confirmed with Dr. James �
<br /> �� � , L. Anderson of the University of Minnesota Soils Extension
<br /> ��r�, Department that mound systemswould be ,approiriate for these soil
<br /> ��� types. Th�se are much the same soils as found in the Medina- �
<br /> �"���::�;:'' Idorningside �rea, which experience conventional trench septic •
<br /> , :� _ system failures d�se to the soil conditions. In general, the
<br /> :w loamy topsoil characteristics for the Ringer property are suitable
<br /> �"a"��. for ro er functionin of standard ressure-mound se tic s stems
<br /> r.�.,.,�. P P g P P Y
<br /> ` �'`�� as per Orono's Code and Design iRanual.
<br /> fi� . �
<br /> ��"`��F t For clarity' s sake I have la�beled the northern most tie� cf seven
<br /> ��`�`� lots as Blo�k l, the western group of six lots as Block 2, and
<br /> �t`s`f� � the two lots to the soutllea�t as Block 3.
<br /> ,;,-��'='� �
<br /> Lot 1, Block 1
<br /> � Peres PB11 thru PB16. Borings BB11 thru BB13. Average perc
<br /> s rates for both primary and a?ternate sites are acceptable. S_lopes
<br /> ,,�,t:w..
<br /> , ;���� are quite level. Saturation indications (mottling) star�ed at
<br /> ����`� 1.7 to 2. 5 feet. Actual water table at 5-7 ' depth. A mound
<br /> �:�,'k�� sys�em shc�.ul.:i �e u�zd due to the presence of shatlow saturation
<br /> �' zones. ,
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