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r <br /> M S T S 9075 155"'STREET. <br /> A DIVISION OF WRM SERVICES INC. KIMBALL,MN 55353 <br /> (320)398-2705 <br /> June 9,2009 <br /> Kea Hong <br /> 1165 Wyndmere Road <br /> Orono,MN 55391 <br /> RE: Septic System Design for 1165 Wyndmere Road,Orono, MN <br /> Dear Kea <br /> As per your request,an onsite wastewater treatment system has been designed for the referenced <br /> property. It is our understanding that your existing system is non-compliant and you wish to upgrade it. <br /> The property was evaluated for it potential to support a standard septic system but due to limited space <br /> and high seasonal watertable no area could be found to support such a system. Therefore an Other type <br /> septic system has been designed in general accordance with Minnesota Rule Chapter 7080. <br /> The system will consist of using the existing two 1000 gallon septic tanks(provided they are inspected <br /> and found to be complaint), installing a 1300 gallon lift station and installing a 1260 pressure bed. An <br /> additional 500 gallon septic tank may be required to meet the city ordinance requirements but because <br /> they are existing and they meet the minimum requirements of chapter 7080 they may not require an <br /> additional septic tank to be installed. The proposed pressure bed area is to be over excavated to an <br /> elevation of 98.0 and filled with 1.2 feet of washed mound sand. The pressure bed is to be constructed <br /> on the washed sand. <br /> Soil borings were completed on the property and revealed fine sandy loam soil with a seasonal water <br /> table at an elevation of 96.2. With the bottom of the proposed pressure bed at an elevation of 99.2 the <br /> system will have the required three feet of vertical separation to the seasonal watertable. <br /> Because this system is classified as an Other type system semiannual monitoring and flow measurement <br /> will be required. For frequencies of the monitoring refer to the monitoring plan attached. Also attached <br /> is a mitigation plan. This plan lays out recommendations to follow if the system or a portion of the <br /> system fails or does not work properly. <br /> If you have any questions regarding the septic design feel free to contact me,I can be reached at 320- <br /> 398-2705 <br /> Sincerely, <br /> Miller's Sewage Treatment Solutions <br /> Bernie Miller <br /> MPCA Lic.No. 1921 <br />