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• R <br /> � r � <br /> �"` ��'�''�?�� <br /> �# ��'''`�����4�;`��' CI'1'Y O� ORONO <br /> �. <br /> Post Office Box 66�Crystal Bay, Minnesota 55323•Municipal Offices <br /> 0 <br /> o _ � � On the North Shore of Lake Minnetonku <br /> January 19, 1988 <br /> Robert Posthumus <br /> 24200 Natches <br /> Lakevil.le, MN 55044 <br /> Re: Lots 58 and 59, Morse IsXand Park - Septic Concerns <br /> Dear Mr. Posthumus: <br /> I have further reviewed the site p].an and septic system design for the <br /> property on Big Island. In addition, I have discussed various concerns <br /> about the system design and layout with Dr. Roger Machmeier of the <br /> University of Minnesota Agricultura7. Extension Service. Dr. Machmeier is a <br /> nationax Zy recognized authority on septic systems and is likely the most <br /> knowledgable individual in the State of Minnesota regarding the design of <br /> such systems for residential usage. <br /> Based on his comments and a further review of the pertinent <br /> ordinances, I would make the following comments and determinations : <br /> 1. The proposed design is not acceptable as-is because the rock beds <br /> are skewed in relation to the contours and therefore the assumptions <br /> used in creating that configuration �re not valid. Mr. Parker used a <br /> literal interpretation of the codes to create this design but it does <br /> not in my opinion fit within the design perameters general ly accepted <br /> within the industry. <br /> 2. If this system had been located in the portion of the property <br /> containing a percolation test, and if that percolation test had been <br /> equivalent to perc test #5 at 11 minutes per inch, the basal width <br /> perpendicuxar to the contour lines would be defined as approximately <br /> 25' with an additional downsl.ope area of 12' required in addition to <br /> the approximately 20' downhi7.1 area required to maintain the necessary <br /> 4:1 slope for maintenance purposes. That wou�d have put the ultimate <br /> boundaries of the system outside of your property boundaries. <br /> 3. Given that it was determined that the proposed system would not be <br /> acceptable, I then layed out the necessary constraining setbacks for <br /> this property to determine if there was any chance that the property <br /> could contain a weYl. , a residence structure and a primary and <br /> alternate drainfie].d site, given the need for mound systems due to a <br /> seasonal perched water table. The limitinq criteria are as follows: <br /> a) For the structure, setbacks on this lot are 75' from the <br /> lake, 30 ' from either side and 30 ' from the rear lot line. <br /> BUILDING&ZONING—473-7357 • ADMINISTRATtON&FINANCE—473-7358 • PUBLIC WORKS—473-7359 <br /> ASS�SSING <br />