06-13-1977 Council Minutes - Laserfiche WebLink

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� � ' Mr. Robert DeGregory Page 14 Page 2 � June 8, 1977 �� Based on the information presented on the evening of June 2 by Mr. Trees and members of the association, I believe that there are several questions � concerning the adequacy of the proposed aluminum sheeting system which have not been satisfactorily answered. I also believe the design of the sheeting � system which was presented would not be considered adequate by the current standards of the engineerir�g profession. Specific questions and areas of � uncertainty are as follows: � l. The soil borings were not carried sufficiently deep to • adequately explore the subsurface conditions. In this instance soil borings should be carried to a depth of at least 5 feet � � below the anticipated bottom of the sheeting. � � 2. The angle of internal friction apparently used in the com- puterized design was 28.5 degrees whereas the angle of f internal friction for silty-clays or clayey-silts is nor- • mally in the range of 15 degrees to 20 degrees. The angle , of internal friction may be higher than 20 degrees if suf- • ficient sand is present in the soil. In any event, the shear strength and cohesion of representative samples of i � the soils should be verified by laboratory tests in order to provide information which is adequate for the purpose � of design. � 3. Mr. Ellis has stated that the existing timber retaining � walls in some portions of the lagoon are displaced upward from 2 inches to 4 inches per year by frost action. I have + not been able to formulate a theory that would explain the reason for this phenomenon, however, if Mr. Ellis' state- ; � ment is accurate, the proposed aluminum system would prob- ! ably also be subjected to the same type of displacement. � � In addition to the points enumerated in the preceding paragraph, there i � is also a question regarding the warranty of the system. Mr. Trees stated i • that Kaiser Aluminum & Chemical Sales, Inc. would warranty their design only 4 for a period of one year. However, I beleive that under the laws of the � State of Minnesota, it is required that the plans for a project of this nature must bear the signature of a registered professional engineer who � certifies that the design was prepared by him or under his direct super- vision. By certifying the design, the engineer assumes responsibility and � can be held liab�e for errors and ommissions in the design. At this time, • there is no statute of limitation regarding the desinger's liability. If my interpretation of the state law is correct, Kaiser Aluminum & Chemical • Sales, Inc. as the designer of the aluminum sheeting system must provide plans certified by a professional engineer registered in Minnesota and � would, therefore, be unable to limit their liability for the design of the system to a period of one year. � I hope that this letter is of some assistance to you and that you will � � contact me if I can be of any additional service to you. � Sincerely, • � ,� , �� _��.�_�� • � Lawrence W. Gubbe � LWG/mb