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� 7�� Proposed Immanuel Lutheran Church Addldon <br /> � ]•1788-3 <br /> r � February 23, 2005 <br /> f t..�. <br /> Page I 1 <br /> � <br /> � As thc cut is dccpcncd. or as thc Icngth of timc an cxc;i�'ution is opcn. thc likclihoo�l uC bank <br /> � tailure incre�ses; there�ore, maintenunce of safe slopes nnd ���orkrr snfcll' shuuld remain thc <br /> responsibiiity of thu contractor, who is prescnt at tl�c sitc, ahlc tu ohscr��r chant.s in thc soil <br /> conditions, and monitor the perfonnance of thc excavation. <br /> � Tcmporary Cut Slone Inclinations: [t is exceedingl�� ditiicult undcr Ihc ��ariablc <br /> circumstances to pro-estaUlish a safe and "mainlenance-lree� temporaiy cut slope anglc. <br /> � Thercfore, il should be the responsibility of tlic contractor to maintain safe temporary slopc <br /> �4 configurations since the contractor is continuously at il�e job site, able to observe die natwr <br /> and condition of the cut slopes, and able to monitor the subsur(ace materials and ground��-ater <br /> 1 couditions encountcred. Unsupported veriical slopes or cuts deeper than 4 ieet arc not <br /> � recommendcd i('�vorker access is necessary. 7'hr cuts should be adequately slopecl, shored, <br /> � or supporied to prevent injury to personnel from lucal sloughing and spalling. The <br /> , excavation sliould contorm to applicaUle Pederal, State, and Local rcgulations. According to <br /> ' Chaptcr 2IG-155 of Uic Washington Administrativc Code (1�VAC), thc native soils <br /> ciicow�tercd across the site �vould Uc classified as T}��c A or Q, and cxisting fill soils as Typc <br /> { C. Temporary slopes should be constructed at angles no gmater thmi specified by tlie�VAC. <br /> - Pennanent Slopc Inclinations: Wc recommend ihal all pernianent slopes constivcted in <br /> j nalive, granular s��ils Uc dcsigned at a 2H:lV (HorirontaL•Vertical) inclin�riio�� or flatter. If <br /> tlic sur(icial topsoil is uscd in non-building and pa�'cmcnt arcas fi�r lill pu��oses, �vc <br /> , rccomtnend Uuit it bc consl�vctcd �vilh in.isimunt 311:I V slopcs. <br /> 1 7.0 CI.OSUItI? <br /> � Thc conclusions and recotnmendmions prescnted in this repor! are based, in part, on thc <br /> exp(orulions accomplished (or tl�is study. Project plans were in tl�� preliminary stage at d�c time <br /> of this report prcparation. We thcreforc recommend that ZZA be provided the opnortunity to <br /> � revicw the project plans and specitications when diey become available in ordcr to confirni that <br /> thc recommcndations and dcsign considcralions presented in this rcport havc bcen properly <br /> intcrprcted and implementcd inio the project design package. <br /> � The integrity of earthwork, stnictural till, and foundation and l�avement perfonnance Jepend <br /> gready on proper sitc prepart�tion and constiuction procedures. \'Vc recommend tha[ a qualifcd <br /> �, � gcotechnical enginccring tinn bc retained to ��rovide gcatcdmical engineering services during thc <br /> earthwork-relate<t consiruction phases of the projccL If variaticns in the subsurface conditions <br /> � arc obscrved at that time, a qualificd cnginccr would be aUlc to provide additional geotechnical <br /> engineering reconuucndntions to the conVactor and desi�m tcam in a timely manner as the project <br /> cunstructiun prugresscs. <br /> � <br /> � <br /> iyznl� u,,;n> <br />