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May 11, 2007 <br /> Liesch Associates, Inc. <br /> 15400 13�' Ave. North <br /> Plymouth, MN 55351 <br /> Terry R. Johnson <br /> 543 Park Lane <br /> Orono, MN 55356 <br /> Subject: 543 Park Lane - Slope stability <br /> Dear Mr. Johnson, <br /> I have reviewed the survey dated November 6, 2006, which illustrates the proposed <br /> grading and retaining wall locations. Based upon our discussions I understand that the <br /> City of Orono Staff have expressed concern over the bank stability near the location of a <br /> proposed berm on the south side of the property. This area is directly south of the <br /> proposed driveway. <br /> The slope is at a 3V:1H The existing grades in this area are between 971.8 and 971.4 feet <br /> MSL. The proposed grades around the berm are proposed to be reduced to between <br /> 970.0 and 970.4 feet MSL. The proposed berm is to be 0.5 feet to 0.9 feet above the new <br /> grade. Thus, the proposed berm will be constructed by lowering of the grade around the <br /> berm rather than a build up. The berm as proposed is actually slightly below the existing <br /> grade and the overall grade in this area is proposed to be reduced between 2.0 feet and <br /> 1.0 feet, approximately. Since the proposed berm is slightly lower than existing grades <br /> and the overall grade is also being lowered in this area the load on the slope will be <br /> reduced. Thus, the net effect will be no change in the stability of the adjacent slope. <br /> Please note that the soil beneath the proposed berm should be properly compacted, if <br /> disturbed. Also, the proposed berm should be seeded and mulched to minimize erosion. <br /> I trust that this information meets your needs. <br /> Sincerely, <br /> LIESCH ASSOCIATES, INC. <br /> . - ��" <br /> y��-� � <br /> l �,--i,. , <br /> Bruce Rehwaldt, P.E. <br />