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City of Centerville <br /> Project SP-07-03738 <br /> November 29,2007 <br /> Page 6 <br /> 8 inches of Class 5 aggregate base. <br /> 20 inches of granular Subbase of Select Granular Borrow. <br /> Geotextile fabric placed below the granular subbase. <br /> 4-inch draintile installed along the edge of the roadways at the granular subbase <br /> C.I.b. Pavement Types and Traffic Loads <br /> It is our understanding that the roadways included in the proposed reconstruction are residential roads <br /> that will experience variable,albeit relatively light,amounts of traffic. Even with the City Standard for <br /> street design,specific information regarding traffic loads was not made available to us For the purposes <br /> of this report,we have assumed that traffic will consist primarily automobiles,an occasional school bus, <br /> waste removal truck and maintenance vehicle(snow removal),and that pavements will experience no <br /> more than about 70,000 Equivalent Single Axle Loads (ESALs)over a 20-year lifespan. <br /> C.l.c. Anticipated Grade Changes <br /> It is our understanding that road elevations will not appreciably change from their existing elevations. As <br /> such,we assume that less than 1 foot of material with either be added or removed to establish proposed <br /> grades. <br /> C.l.d. Construction Schedule <br /> We assume utility installation and roadway construction will occur during the spring and summer months <br /> of 2009. <br /> C.I.e. Precautions Regarding Changed Information <br /> We have attempted to describe our understanding of the proposed construction to the extent it was <br /> reported to us by others. Depending on the extent of available information,assumptions may have been <br /> made based on our experience with similar projects. If we have not correctly recorded or interpreted the <br /> project details,we should be notified. New or changed information could require additional evaluation, <br /> analyses and/or recommendations. <br /> C.2. Pavement Support <br /> Based on penetration resistance data it is our opinion that the existing S11, alluvial and glacial soils <br /> encountered are generally competent and suitable for pavement support including the pavement section <br /> described above in Section C.I_ Pavement performance,however,will be affected by their variable <br /> competence, It should,therefore,be anticipated that measures be taken to at least scarify,blend and <br /> compact the exposed subgrade(material below the granular subbase)to provide more uniform,stable <br /> support to pavements. <br />