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McCOMBS-KNUTSON ASSOCIATES, INC. <br />CONSULTING ENGINEERS ■ LAND SURVEYORS ■ SITE PLANNERS <br />Mr. Allan Olson <br />Building Inspector <br />City of Orono <br />P. 0. Box 66 <br />Crystal Bay, MN <br />Subject; <br />55323 <br />Proposed On-Site Sewage Treatment System <br />Lots 6 & 7, Swan Lake Addition <br />Dear Al; <br />We have reviewed the percolation tests and the design <br />of the on-site sewage treatment system for the subject property <br />as prepared by Soil and Materials Engineers. The site in <br />question is suitable for construction of an on-site disposal <br />system and we would therefore recommend the granting of a permit <br />to construct a system. <br />Mr. Overtoon, the design engineer for the project, has <br />proposed 250 linear feet of drain tile in a 36 inch trench <br />based on an average perc. rate indicated that the average rate <br />review of the average perc. rate indicated that the average rate <br />for design of the system should be 50 minutes per inch for the <br />proposed three bedroom house utilizing a 36 inch trench; 310 <br />linear feet of drain tile would therefore be required. Drain <br />tile shall be overfilled with four inches of filter media <br />material placed over the drain tile as oj>posed to the two <br />inches specified by the design engineer." <br />If you have any question or comments, please do not <br />hesitate to contact us. <br />Sincerely, <br />Richard W. Sathre <br />RWS:slw <br />12805 OLSON MEMORIAL HIGHWAY, MINNEAPOLIS. MINNESOTA 55441 TELEPHONE (612) 559-3700 <br />36 NORTH MAIN STREET. HUTCHINSON, MINNESOTA 55350 TELEPHONE (612) 879-8029 <br />SOUTHWEST ENGINEERING DIVISION, MARSHALL, MINNESOTA 56258 TELEPHONE (507) 532-5820