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i <br /> IRecommended Design Pavement Sactions <br /> I Clus B HMA Cl�u E HMA Crwh�d SuAaelnp B�s� PCC Pldn JdnMd Cwrw <br /> Thlekn�ss Thlekn��� Coun�with I��s th�n 6% P�wrmM Thleknws Appnp�N <br /> (ineh�s�' (Ineh�s)' fln��eont�nt(Ineh��)' (Ineh��) B�s�IIneM��' <br /> Automoblls Parking end Llpht Duty Sarvlca Vahlcls� <br /> i 3 8 <br /> � Henvy Dury TraHie end Limlted Bw TrsHle <br /> Allernative 1 2.5 7 8 <br /> �� Alternative 2 8 8 <br /> Bus TreHlc end Perking <br /> I9 8 <br /> Notes: <br /> I ' HMA Class Yrinch, PG 58•22 per WSDOT SlandaM Specificalions 5-04 and 9•03. <br /> ' Crushed SuAacing per WSDOT Slar.dard Specificalion 9�03.9(3)compacted ta 95 porcent ol MDD detertnined using <br /> ASTM D-1557,W be placeA on subgrade compa 'ed to 95 percent of the MDD. <br /> ' Coa�se eggregete base should be similai lo AA:HTO Greding No. 57 es defined in WSDOT specification B-03.1�4)C. <br /> I The ebove pavemen�recommendations assume sulgrede preparation end placement ol structurel fill as previous�y <br /> I recommended. <br /> DRAINAGE CONSIDERATIONS <br /> IWc rccommcnd Ihat pavcmcm �urfaccs bc sloped so that surfacc walcr runoff Oows awuy Gom thc <br /> pavcrocnt. Thc surfacc wutcr should bc dischnrgcd into thc stomi drnin systcm through catch basins. <br /> ; Grading in all arcas should hc planncd to avoid conccntration of runoff nnto fill, cut slopes, natural slopcs <br /> slceper Il�an 10 percem or othcr crosion-scnsitivc arcas. I,ong-tcrtn pavement perfortnance is dependeN <br /> on a dminagc systcm thal wiil pcmiit rapid drainagc ofµatcr from ihc basc coursc and subgradc laycrs. <br /> ( SEISMIC DESIGN CONSIDERATIONS <br /> ISelsmlctty <br /> I'hc silc is localed ailhin thc 1'ugci Suund re�!ion, whidi is scismically�ctive Scismicity in lhis rcgian is <br /> attrihu�cd pnmarily �o thc iNcraction hctwcen Ihc Pacitic, Juan dc Puca and North Amcrican piatcs. 7'hc <br /> Juan dc Puca platc is subducling hcnca�h thc North .4mcrican platc. It is thought that thc rcsulttng <br /> dcli�mia�ion nnd hrcakup of thc Juan dc Puca pintc mighi accoun� I'ar �hc dccp focus carthquakcs in thc <br /> rcgion. I lundrods ol�carthyuakcs havc Ixcn rccordcd in thc Pugcl Sound arca. In rcccnt history, fuur of <br /> ihesc enrthyuakcs werc large events: (I) in 1946, a Richtcr maEnitudc Z� carthyuake occurred in the <br /> Vancouvcr Island, Rn�ish Columbia arca; (2) in 1949,a Richtcr magnitudc 7.1 carthquakc occurmd in ihc <br /> Olympia arca; (3) in 19G5, a Richtcr magnitudc 6.5 carthyuakc ocwrrcd bclwccn Scattic and "I'acoma; <br /> anJ(4)rcccntly in 2001,a Richtcr magniluJc 6.R occurrcd ncar Olympia. <br /> Ncscarch is prescntly undcrway rcgarding historical Inrgc mngniludc sutxiucuon-rdatcd carthquakc <br /> activily alon� the Washington nnd Oregon coasts. (ieologisls are reporting evid��ce that suggests several <br /> I�irgc ma�niiudc canhyuakcs IRichtcr magnimJc 8 to 9) havc occurrcd in thc .ast I,500 ycars, thc most <br /> rcccni of which uccurtcd ahuw 300 ycars agu. No carthquakcs of this magni�adc havc bccn documcntcd <br /> during ihc rccurdcd hisinry of�hc Pacific Northwcst. Lncal dcsign pracNec in Puget Sound and local <br /> ' huilding cnJes nnw consider Ihe possibic efl'ect of a very large suhduction earthyuake in the design of <br /> structures. <br /> F�Ir Nn 1�ro5.n/v.n3 ---- Pa�e 9 CsEOEMGINFU� <br /> 'I v����?:.1unv <br />