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H" KLEINFELDER <br /> File No.: 20-3304-01 <br /> February 1, 1990 <br /> Page 8 <br /> Pavements Sections <br /> We have assumed that the parking subgrade will consist of the near-surface sandy <br /> soils. We performed a Resistance-Value (R-Value) test on a sample of the sandy <br /> soils and our test results indicate an R-Value of 58 at an exudation pressure of 300 <br /> pounds per square inch. The Caltrans method of design permits the use of a maximum <br /> R-Value of 50 in design. Our calculations are based on a Traffic Index of 4.0 for <br /> general parking and 5 .5 for main aisles and truck traffic. <br /> Traffic Thickness of Minimum Thickness <br /> 1 Area Index Asphalt Concrete of Aggregate Base <br /> General Prkg 4.0 2" 4" <br /> I <br /> Main Aisles 5 .5 2" 5-1/2" <br /> 1 <br /> The subgrade soils over which these paving materials are placed should be compacted <br /> to a minimum depth of 6 inches to a minimum of 95 percent of the ASTM D-1557 <br /> maximum dry density at a moisture content near optimum . In addition, it is <br /> recommended that all pavements conform to the following criteria: <br /> 1 . All trench backfills, including utility and sprinkler lines, <br /> j should be properly placed and adequately compacted to provide <br /> a stable subgrade. <br /> 2. An adequate drainage system should be provided to prevent surface <br /> } water or subsurface seepage from saturating the subgradeysoil. <br /> j 3 . The aggregate base should be compacted to a minimum of 95 percent <br /> i <br /> t <br />