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T <br />J% <br />• <br />APPENDIX A <br />DESIGN CALCULATIONS <br />Structural Number Verification <br />(AASHTO Desigrt of Pavement Structure - 1986) <br />Traffic: Desigo 18 kip ESAL: 17A,000 <br />Reliability: 50 percent <br />Overall Deviation: 0.10 <br />Soils: Resilient Modulus 5000 psi <br />• PSI Loss Due To Traffic: 2.0 <br />Required Structural Number = 2.?b <br />Required Gravel Section <br />Minimum Structural Number(MSN) required = 2.2b <br />Gravel Section Required, using 6 inches of new base course and 11 inches of epsting gravels = > <br />(2?6 - 6(0.14) - 11(0.06))/0.10 = 7.6 = > <br />Use 8 inches of pit run subbase gravels and 6 inches of road base gravels. <br />u <br />1l~dfo <br />