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W.T.(Mac) McCalla, 'E. <br /> 6600 75",Avenue North.Brooklyn Park.MN 5=-123 <br /> (612)560-7446 <br /> October 24 , 1989 I <br /> • ii <br /> Mr. Larry Warden I <br /> Access Mobility Systems <br /> 112 Lewis Street <br /> Shakopee, MN 55379 <br /> re: Footings , Cliff Climber <br /> WTI Project No. 149 <br /> Dear Mr. Warden <br /> v viewed the sheet dated 5/4/89 f h <br /> Per your request, I have reor the <br /> "Cliff Climber", for footing adequacy. For ease of construction, <br /> I recommend a round footing rather that rectangular so that a <br /> post hole digger or auger may be used. Use an eight( 8) inch <br /> diameter by twelve ( 12 ) inch deep footing, reinforced with a <br /> cylinder formed from 6x6-10/10 welded wire fabric (mesh) . This <br /> will reinforce the concrete against any lateral loads that may <br /> occur. The post should be embedded 6 inches in the concrete. <br /> The required strength of the concrete should be at least 3, 500 <br /> psi at 28 days . The load of 1 , 100 pounds used gives a soil <br /> loading of 1 , 571 , psf allowable required. This low requirement <br /> will allow the use of all but the poorest soil. At any rate, <br /> you must dig below the local frost level and until firm soil is <br /> reached. I have not checked any of the steel framing members <br /> for adequacy. <br /> Please call if you have any questions. <br /> Very truly yours ,- <br /> ' <br /> W. T. McCAILA <br /> + E-15178 <br /> W. T. McCalla, P. E. OSScO, C <br /> M1NN. �4r <br /> Structural Consuwtant <br />