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� <br />Intracorp <br />July 16, 1998 <br />�� � <br />�� <br />E-3592-620 <br />Paqe 10 <br />The adequacy of site pavements is related in part to the condition of the underlyinp <br />subgrede. To provide a properly prepared subgrade for pavements, the aubgrade shouid <br />be treated and prepared as described in the Site Preparation section of this repon. This <br />means at least the top iwelve (12) inches of the subgrade should be compacted to 95 <br />percent of the maximum dry density (per ASTM D-15571. It is poasible that some <br />localized areas of soft, wet or unstable subgrade may still exist after this process. <br />ThereFore, a preater thickness of structural fiil or crushed rock may be needed to stabiiize <br />these localized areas. <br />The following pavement section for lightiy-Ioaded areas can be used: <br />• Two inches of asphalt concrete (AC) over four inches of crushed rack base <br />(CR8) material, or <br />• Two inches of AC over three inches of asphalt treated bese (AT8) material. <br />Heavier truck-traffic areas will require thicker sections dependi�p upon site usay�, <br />pavement 8fe and site traffic. As a general rule, the followiny sections can be considared <br />for truck-tra�cked areas: <br />� Three inches of AC over six inches of CRB, or <br />• Three inches of AC over four and one-half inches of ATB. <br />All pavement materials should conform to WSDOT spectflcations. The use of a Class B <br />asphalt mix is suggested. <br />Eartn Comult�e. Nc. <br />