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GEOTECHNICAL ENGINEERING STUDY <br />Inform, Inc <br />May 9, 2002 <br />Fueling and DrNe Area Pavementa <br />E-8493•5 <br />Page 12 <br />The adequacy of site pavements is related in part to the condition of the underlying <br />subgrade. To provide a properly prepared subgrade for pavements, the subgrade should <br />be treated and prepared as described in the Sife Preparation and General Eerthwork <br />section of this report. This means at ieast the top twelve (12) inches of the subgrade <br />should be compacted to 95 percent of the maximum dry density (per ASTM 0-1557-911. <br />It is possible that some localized areas of soft, wet or unstable subgrade may still exist <br />after this process. Therefore, a preater thickness of structural flll or crushed rock may be <br />needed to stabilize these localized areas. <br />Tho following flexible pavoment section for liphtly-loaded areas can be used: <br />• Two inches of asphalt concrete (AC) over four inches of crushed rock base ICR81 <br />material, or <br />• Two inches o( AC over ihree inches ot asphalt treated base IATB) material. <br />Lipht trattic ereas around the proposed luelinp islands will receive rigid concrete <br />pavement. A minimum of tour inches ot Portland Cemem Concreto (PCC) can be used in <br />liphlly loaded ripid concroto pavement areas. <br />Heavier truck•troflic areas will require thicker seaions dependinp upon site usape, <br />pavemant li(n end sito tralfic. In our opinion, the (ollow�n� Ilnx�blc pavement sections <br />c�n be used (or truck-traf(icked areas: <br />• 7hree inches oi AC over six inches of CRD, or <br />• Thrao inches o( AC over tour and ono-hall inches o1 ATD, <br />Daponding on final prados, it mey bo IoasiblA to incorporeta tho axistin� pavement into <br />tho linal pavcment soction. <br />I�avement matcri�l5 ahoulr! r,nnform to WSDOT aperilit�iiona. 7he uso ot e Clasa B <br />:��,pholt rrnx in su�t)r•.:1��d. <br />[��th f �.nanN�n4 Inr <br />