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J. H. KLEINFELDER & ASSOCIATE_S <br /> File No. S-2314-1 <br /> August 15, 1978 <br /> PAGE TWELVE <br /> Pavement Sections <br /> We performed Resistance-Value Tests on samples of the <br /> surface soil at this site. These test results indicate <br /> T <br /> R-Values of 20 and 21 at an exudation pressure of 300 pounds <br /> per square inch. We have used a Resistance-Value of 15 as <br /> a design value to account for possible soil and compaction <br /> variations in the field. Based on this design R-Value. and on <br /> an assumed Traffic Index of 5 for interior residential streets , . <br /> we recommend the following pavement sections : <br /> Recommended Recommended <br /> -. Recommended Thickness of Thickness of <br /> Thickness of Class II Class III <br /> Asphalt Concrete Aggregate Base ASB <br /> 2 4 7 <br /> 3 8 - <br /> Based on recent studies by our firm, it may be possible <br /> to increase the design R-Value to 50 by the addition of approxi- <br /> mately 3 to 4 percent lime to the subgrade soils . For this <br /> design value, a pavement section of 2 inches of asphalt concrete <br /> underlain by 4 inches of aggregate base would be required for a <br /> Traffic Index of 5 . Our firm can provide additional information <br /> if this alternative is to be considered further. <br /> The subgrade soils over which these paving materials <br /> are placed should be compacted to a minimum depth of 12 inches <br /> to a minimum 95 percent of ASTM D-1557-70 maximum dry density. <br /> In addition, it is recommended that all pavements conform <br /> to the following criteria : <br /> 1 . All trench backfills, including utilities <br /> and sprinkler lines should be properly <br /> placed and adequately compacted to provide <br /> a stable subgrade. <br /> 2. An adequate drainage system should be <br /> provided to prevent surface water or <br /> subsurface seepage from saturating the <br /> subgrade soil . <br />