09-18-2006 Planning Commission Packet

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� '. , �' ,5 I � PxorrE:763-633-222� Fnx: 763-633-2229 Miller EnviroiiineiZtal Inc. 11040 183rd Circle N.W.,Suite AA•Elk River,MN 5533C � � � August 16, 2006 i � Tim�Peterson � � �. 16415 Linch Avenue Lakeville, Minnesota 55044 ; � i . Sub�ect: Onsrte Wastewater System (OWS) Design ; - � Legal Description - 560 Big Island; Lake Minnetonka; City of Orono; Hennepin County � Site Conditions - The property is located on an island of Lake Minnetonka. From the lake the property . slopes up a 12% — 18% incline with mature maple and oak trees to a plateau where the residence will be located. i . Soil Conditions — The Hennepin County soil survey mapped the area as the Lester Series. The Lester Series is the Minnesota state soil and is very common in Des Moines Lobe glacial till deposits of central � Minnesota, specifically Wright and Hennepin Counties. � A copy of the description for the Lester Series is included in Appendix A. The soil survey indicates the � soils in the Lester Series are very deep, well drained loamy soils formed in glacial till. Five soil borings � were completed, four in the area of the proposed and alternate drain field areas, see Figure 1. The soil � borings closely matched the soil survey description of the Lester Series in the proposed drain field areas. R � Soil borings indicate the site is underlain by high chroma loam, sandy loam, and clay loam soils to , - _ approximately 5.5 feet. The parent material for the area, high chroma loam soils with many threads of � calcium carbonates (often misidentified as low chroma iron reductions), were found to the depth of the borings. Many gray sand coatings on ped faces, calcium carbonates, and reddish iron concretions f (referred to as ochres in the geologic culture) were observed. These soil features are a result of the soil , parent material not a fluctuating seasonal water table. ISoil percolation testes were performed at the locations shown on Figure 1. The results from the tests are , in Appendix A. � The results of the soil borings and percolation tests indicate that the site can support a standard ! subsurface drain field at the proposed area depicted on Figure 1. A soil sizing factor of 2.2 square feet per gallon per day has been selected. ! . Sizin� of Treatment Svstem — The proposed residence will consist of less than 2,000 square feet with three bedrooms and two water using devices; a dishwasher and clothes washer. The residence is i . �` � 1 <�.� r� .. `'-,��`� .',.. ��q ��`. `t'. � e��..,:.�,...� �) s� :5� <�;;r $��;.i �, i� ;+'. � — — --- �7 �tt i,:rNf'' . "'sy}., y,f=^`'- >:�l,ys;�', � � �y s 1' S,.'�� ( ,.e c n j'y�-y'y,;,,�,�+� �-$_ : �. �'•s�-:..'� �t"`V�� rC tiy6;'l� �'';