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September 15,2018 <br /> Proj�t 18-412 <br /> Sl�vel Ready Proj�t Site <br /> PecNot Lakes,Minn�sota <br /> subgrade material. Based on our experience with similar soils,we recommend an R-value of 70 <br /> be assumed for the anticipated subgrade materials. <br /> Based on an assumed R-value of 70,we recommend the following bitiuninous pavement section <br /> for general car aad light truck pazking lots: <br /> TLicl�ess Conrse/Descriot3on G.E. <br /> 1.5" MnDot 2360 SPWEB240 Bituminous 3.4" <br /> 2.0" MnDot 2360 SPNWB230 Bituminous 4.5" <br /> 6.0" MnDot 3138 Class 5 or 6 Aggr�eeate Base 6.0" <br /> 9.5" TOTAL 13.9" <br /> In using the above R value for bituminous pavement design,it is essential that the subgrade be <br /> constructed of uniform soils at a moisture content and density in accordance with MnDOT <br /> spe,cifica.tion 2105 and capable of passing a test mll in accordance with MnDOT specifica.tion <br /> 2111. The native,undisturbed soils may need preparation(drying and compacting)to pass a <br /> proof roll. If the subecade is not compacted,uniform and capable of passing a test roll,then we <br /> recommend the subgrade be scarified and recompacted or subcut and geotextile fabric placed <br /> along with select granular material meeting MnDOT specification 3149. The top of subgrade <br /> should be compacted to a minimum of 100%of standard proctor maximum density. The <br /> subgrade should be sloped towards the edges to provide drainage. <br /> F. Closing <br /> Our work was performed for geotechnical purposes only and not to document the presence or <br /> extent of any contamination on the site. We can note that our crew did not detect any obvious <br /> contamination by sight or smell during drilling operations. However,human senses are limited in <br /> terms of contamination detection and,therefore,the lack of detection through human sensing does <br /> not preclude the possibility of the presence of contamination of the site. <br /> This report represents the result of our subsurface investigation and is based on information <br /> gathered at specific locations. Subsurface conditions can change a great deal over short horizontal <br /> distances. Also,the actual interface between strata will likely be a gradual hansition rather than an <br /> Page 8 <br />