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' sM 8rauo InMrfwc Engineering,Inc. <br /> sR A� N 6801 Washington Avenue Soufh <br /> ' P.O.Box 391�08 <br /> I N T E RT E C Minneapolis,Minnesota 55439-0108 <br /> 612-941-5600 Fax:941-4151 <br /> Engineers and Scientists Serving <br /> , the Built and Notural Environmenls <br /> December 19, 1991 Project BABX-91-589 <br /> 1 <br /> Mr. Timothy I. Marr, P.E. <br /> ' Hennepin Parks <br /> 12615 County Road 9 <br /> ' P.O. Box 41320 <br /> Plymouth, MN 55441. <br /> , Dear Mr. Marr: <br /> Re: Preliminary Geotechnical Evaluation for Proposed Visitors Center and Parking Areas <br /> � at Noerenberg Memorial County Park, Orono, Minnesota <br /> As you authorized on November 8, 1991, and based on our proposal dated November 11, <br /> ' 1991, we have completed our preliminazy geotechnical evaluation for the above-referenced <br /> project. <br /> ' The soils encountered in the borings genecally consisted of 1 1/2 to 3 feet of topsoil overlying <br /> glacially deposited sand and clay to the termination depth of the borings. Groundwater was <br /> encountered in the borings ranging in depth from 2 1/2 to 10 feet below the surface <br /> ' conesponding to elevations from 932 to 940. <br /> ' The majority of soil encountered in the borings will provide adequate support for the � <br /> proposed visitors center. Prior to construction or placing fill, we recommend all topsoil and <br /> the upper softer clay layers be removed from the building area. Once this azea is cut to grade <br /> ' � or the fill area is properly compacted, we recommend the building be supported by a typical <br /> spread footing foundation system. We recommend footings be sized to exert a maximum soil <br /> bearing pressure of 2,000 pounds per square foot (ps�. <br /> ' In the azkin areas we recommend the su�cial ve etation and to soil be removed rior to <br /> P g , g P P <br /> piacing fill or the pavement section. Based on the soils encountered in the borings, we � <br /> � recommend the pavement section be designed using an assumed Hveem stabilometer R-value <br /> in the range of 10 to 20. <br /> ' Please refer to the attached report for a discussion of the investigation results and our analysis . <br /> and recommendations. <br /> , <br /> ' <br /> , <br />