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SunwoodDriveΑStreetImprovements <br />Ramsey,Minnesota <br />NTIProjectNo.16.61770.100 <br />Ifimportedfillisrequiredinpavedareasitshouldconsistofdebrisfree,nonorganic,mineralsoilsimilar <br />incompositiontothesubgradesoilsencounteredinthesurroundingareas.Ifsandisimportedinto <br />areasthatareunderlainbyrelativelyimperviousfinegrainedsoilsthesandlayermustbedrainedwith <br />draintileinordertopreventfrostheavefromwatertrappedwithintheimportedsandlayerduring <br />freezingtemperatures.Individualliftsofengineeredfillshouldbetemperedformoisturecontent, <br />placedandcompactedasnotedintheͻtƌğĭĻƒĻƓƷandCompactionofEngineeredCźƌƌͼsectionin <br />AppendixBofthisreport. <br />Theperformanceofstabilometerorsimilartests,werebeyondthescopeofthisreport;however,they <br />maybeperformed,uponrequest,foranadditionalfee.Basedontheencounteredsoilconditions,we <br />estimatethataproperlypreparedpoorlygradedsandwithsilt(SPSM)soilswillhaveanaverage <br />stabilometerRValueof40. <br />Fora20yeardesignpavementlife,Table3presentsourthicknessrecommendationsforflexible <br />(bituminous)pavement.Theserecommendationswerebasedupontheencounteredsubgrade <br />conditions,estimatedRvaluefortheexistingsubgradesoils,theassumedAADTvolumes,andtheCity <br />ofwğƒƭĻǤ͸ƭtypicalpavementsectionfortherespectiveprojectarea. <br />1 <br />Table3:FlexiblePavementThicknessDesign <br />SunwoodDrive <br />CalculatedRequired/źƷǤ͸ƭTypical <br />2 <br />PavementSectionPavementSectionPavementSection <br />BituminousWearCourse(inches)1.51.5 <br />BituminousBaseCourse(inches)2.02.0 <br />Class5or7AggregateBase(inches)6.04.0 <br />1.AssumedAADTvolumeof3500andanestimatedRvalueof40. <br />2.Thecalculatedrequiredsectionwasgreaterthanthe/źƷǤ͸ƭtypicalsectionforresidentialstreets,thusNTI <br />recommendsthattheCalculatedRequiredPavementSectionbeimplemented. <br />Pavementrecommendationsassumethesubgradesoilsandaggregatesectionbelowpavedsurfaceswill <br />draintosubsurfacepipingforeventualdischargeintostormsewer,orabovegradetoditching,orsimilar <br />acceptablesystems.Lackofsurfaceandsubsurfacedrainagewillsignificantlyreducethecapacityand <br />longevityofthepavementsystemsindicatedabove. <br />Werecommendpavementsreceiveannualmaintenance,asaminimum,tocorrectdamagestothe <br />pavementstructure,cleanandinfillcrackswhichdevelop,andrepairorresurfaceareaswhichexhibit <br />reducedsubgradeperformance.Thelackofmaintenancecanleadtomoistureinfiltrationofthe <br />pavementstructureandsofteningofthesubgradesoils.This,inturn,candegradetheperformanceof <br />thepavementsystemandresultinpoorlyperformingpavementswithshortenedlifeexpectancy. <br />Page6of7 <br /> <br />