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E <br />COMBS-KNUTSON ASSOCIATES, INC. <br />CONSULTING ENGINEERS N LANG SURVEYORS ■ SITE PLANNERS <br />January 12, 1977 <br />Mr. Al Olson <br />City of Orono <br />P.O. Box 66 <br />Crystal Bay, MN 55323 <br />Subject: Septic System Review <br />Lot 4, Block 1, Fairview Addition <br />Dear Al: <br />We have reviewed the subject septic system application <br />and offer the following comments: <br />1. Two check valves should be installed on the discharge <br />line of the lift pump. <br />2. A back water valve should be installed on the <br />gravity flow line from the house to the lift pump <br />structure. <br />3. All septic tanks should be constructed in accordance <br />with Orono's regulations. <br />Providing that the above items are met, we recommend <br />approval of the system as submitted. <br />GF:sw ENROWE <br />2333 M <br />JAN 1:3 19l1 D� <br />1. 4'171/ <br />Very truly yours, <br />McC S-KNUTSON ASSOCIATES, INC. <br />G g rank, P.E. <br />12805 OLSON MEMOPIAL 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 <br />