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Rir.Bil1 Way <br /> July 25, 1996 <br /> We expect that tratFc wil! mainly co�uist of light passenger vehicles,with oniy ocasional hesvy trafEic <br /> in the Corm of service trucks and hash rcmoval vehicles. Based on this information, with a stable <br /> subgrade prepared as recommended,we mommend the following pavement secdons: <br /> • Two inches oCazphalt concrete(AC)over four inches ofcrushed rock base(CRB) <br /> � • Two incha of AC over three inches of asptielt treated baze(ATB) <br /> 7'he paving materials used should confortn to the Washington State Depaztrnent of Tcanspoctaaon <br /> (WSDU'I)specifications for Class B azphalt concrete,ATB,and CRB surfacing. <br /> Long-tertn pavement performance will depend on surface drainage. A poorly-drained pavemrnt secdon <br /> will be subject to prcmature Cailure as a rcsult of surface water infiltrating into the subgrade soils end <br /> r' rcducing their supporting capability. For optimum perfortnance, we rccommend surface draiflage <br /> gradients of at least hvo percent. Some degree of longitudinal and hansverse cracking of the pavement <br /> surFace should be expected over time. Regular maintenance should be planned to seal cracks when they <br /> occur. <br /> We appreciate the opportunity to provide geotechnicai services to you an this projec� We trust the <br /> infortnation prcsented is sufficient for your current needs. If you have any quations or need addidonal <br /> information,please calL <br /> Sincerely yours, <br /> TERRA ASSOCIATES,IIVC. . <br /> �� �/�'�'�"�.t <br /> Kevin P.Roberts, P.E. <br /> Project Engi er <br /> �� ..��,'.�.-����� <br /> 'fhead rc J.Schep , P.E. <br /> Principal Engineer � � <br /> KPR/CJS:ts <br /> Encl: Figurc I -Vicinity Map <br /> Figure 2 -Exploration Location Plan - <br /> Figures 3 and 4-Test Pit Logs " <br /> Figure 5 and 6-Grain Size Malyses <br /> Project No.T-2736•l <br /> Page No.6 <br />