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File No. 20-3668-01 K L E I N F E L D E R <br /> January 7, 1993 <br /> i <br /> i <br /> Assumed Minimum Minimum <br /> Traffic Thickness of Thickness of <br /> Index Description As halt Concrete.In. Aggregate BasejLi. <br /> 4 General auto- <br /> mobile parking 2 4 <br /> 5 Aisles for general <br /> parking and light <br /> delivery trucks 2 4.5 <br /> 8* Truck lanes 5 6 <br /> 81h* Truck lanes 5 6.5 <br /> * Safety factor included. <br /> The subgrade soils over which these paving materials are to be placed should be compacted <br /> to a minimum depth of 6 inches to a minimum of 95 percent of the ASTM D-1557 maximum <br /> dry density at or near optimum moisture content. In addition, it is recommended that all <br /> pavements conform to the following criteria: <br /> 1. All trench backfills, including utility and sprinkler lines, should be properly placed <br /> and adequately compacted to provide a stable subgrade. <br /> 2. An adequate drainage system should be provided to prevent surface water or <br /> subsurface seepage from saturating the subgrade soil. <br /> 3. The aggregate base should be compacted to a minimum of 95 percent of the ASTM <br /> D-1557 test density. <br /> 4. The aggregate base and asphalt concrete materials should conform to the <br /> specifications stated in Sections 26 and 39, respectively, of the State of California <br /> Standard Specifications, latest edition. <br /> 5. TheP avement section recommendations presented assume that periodic maintenance <br /> of pavements will be done, including sealing of cracks. <br /> 6. All curbs surrounding land should be embedded at least 6 inches below <br /> o g <br /> subgrade to minimize the movement of moisture beneath pavements. <br /> Copyright 1993 Kteinfeider, Inc. Page 8 of 11 <br />