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GEOTECHNICAL INVESTIGATION <br /> EVERETT,WASHINGTON <br /> March 2,2018 <br /> conditions. The subgrade strength and performance characteristics of a silty subgrade material may be <br /> dramatically reduced if this material becomes wet. <br /> Based on our knowledge of the proposed project,we expect the traffic to range from light duty(passenger <br /> automobiles)to heavy duty(delivery trucks). The following tables show the recommended pavement <br /> sections for light duty and heavy duty use. <br /> ASPHALTIC CONCRETE(FLEXIBLE)PAVEMENT <br /> LIGHT DUTY <br /> Asphaltic Concrete Aggregate Base* Compacted Subgrade*** <br /> 2.5 in. 6.o in. 12.0 in. <br /> *95%compaction based on ASTM Test Method D1557 <br /> **A proof roll may be performed in lieu of in place density tests <br /> HEAVY DUTY <br /> Asphaltic Concrete Aggregate Base* Compacted Subgrade*** <br /> 3.5 in. 6.o in. 12.0 in. <br /> *95%compaction based on ASTM Test Method D1557 <br /> **A proof roll may be performed in lieu of in place density tests <br /> PORTLAND CEMENT CONCRETE(RIGID)PAVEMENT <br /> Min.PCC Depth Aggregate Base* Compacted Subgrade* <br /> ** <br /> 6.o in. 6.o in. 12.0 in. <br /> *95%compaction based on ASTM Test Method D1557 <br /> **A proof roll may be performed in lieu of in place density tests <br /> The asphaltic concrete depth in the flexible pavement tables should be a surface course type asphalt,such <br /> as Washington Department of Transportation(WSDOT) 1 inch HMA. The rigid pavement design is <br /> based on a Portland Cement Concrete(PCC)mix that has a 28 day compressive strength of 4,00o pounds <br /> per square inch(psi). The design is also based on a concrete flexural strength or modulus of rupture of <br /> 55o psi. <br /> 12 <br />