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FJaFile No. 20-3821-O1.GO1 KLEINFELDER <br /> nuary 6, 1995 <br /> 5. Pavement Sections <br /> We performed one R-Value test on a sample of the near-surface soils obtained from the <br /> approximate location shown on Plate A-1. The test result indicates an R-Value of 74 at an <br /> exudation pressure of 300 pounds per square inch. <br /> We understand that approximately fifty trucks per day will enter the facility. This equates to <br /> a traffic index of 8.5. <br /> The Caltrans method of design for flexible pavements suggests the use of a maximum R-Value <br /> of 50 in design for these types of soil. Based on assumed traffic indices, a maximum R-Value <br /> of 50, and using the design guidelines contained in Topic 608 of the Caltrans Highway Design <br /> Manual, we recommend the following pavement sections: <br /> Minimum <br /> Minimum Minimum Thickness of <br /> Traffic Thickness of Thickness of Portland Cement <br /> Index Asphalt Concrete Aggregate Base Concrete Pavement <br /> 4.0 2" 4" <br /> General <br /> Passenger <br /> Parking <br /> 8.5 5" 6" - <br /> 4„ 81/2,. <br /> Graveled - 12" - 18" - <br /> Truck Parking <br /> Area <br /> The subgrade soils over which the paving materials will be placed should be compacted to a <br /> minimum depth of 6 inches to a minimum of 95 percent of the maximum dry density as <br /> determined by the ASTM D-1557 test method, at a moisture content near optimum. In <br /> addition, it is recommended that all pavements confirm to the following criteria: <br /> • All trench backfills, including utility and sprinkler lines, should be properly <br /> placed and adequately compacted to provide a stable subgrade. <br /> • An adequate drainage system should be provided to prevent surface water or <br /> subsurface seepage from saturating the subgrade soil. This is especially <br /> important in the graveled parking area. <br /> Copyright 1995 KIcinfc1der, Inc. Page 6 of 9 <br />