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+ Gcotcchnical Gnginecring Gvaluation <br /> 162i England r�venuc <br /> �vcrctt, Washington <br /> NGA Pilc No. 781GOR <br /> I�cbruary 20, 2005 <br /> Pagc 5 <br /> � recommend that thc do�vnslopc footing lincs bc c�tended bclow gradc approsimately four feet to provide <br /> protcction from thc slope. This is intendcd to rcduce potcntial impact of the development on the steep <br /> slopc,and also to rcducc thc risk of undcnuining thc residcncc should any slopc failures takc placc. <br /> A dry wcll is pinnncd for stormwatcr infiltration. 'fhe dry well should be placed at Ieast 50 feet nway 1 <br /> I Gom thc slopc face to reduce the potcntial for landsliding. �Ve also rccommend that the bottom of the <br /> Iwcll bc placcd a minimum hvo fcet bclow the bottom floor cicvation of thc plamicd residence. Thc dq� � <br /> ���cll should be fillcd with ���ashcd rock and sized based on a des�gn infiltration rate of five inchcs per 1 <br /> � hour. <br /> A ncar vertical cut ovcr four fcet in hcight is locatcd ulong thc wcsicrn side of the proposed building. t <br /> � Although this cut appcars stablc, wc do not rccommenJ workcr acccss within tcn fcet of this cu[ without p <br /> temporarily si�oring tliis cut. Wc are availablc to pro��idc recommendations for shoring. All <br /> IOSI1A/1VISIiA safcty rcquirements should bc obscrvcd on this site at all times during construction. <br /> Maintaining safc sitc conditions is ihc solc responsibility of thc contractor. NGA assumes no <br /> ( responsibiliry for thc stability of this cut and/or any othcr safcty rclatcd issucs. <br /> I NGA should bc retaincd to providc monitoring and consul�ation scrvices during construction to confirm <br /> ihat thc conditions encoantcrcd arc consistcnt with thosc indicatcd by thc cxplorations, to providc <br /> recommendatious for design changes should the conditions revcaled during the work differ from those <br /> � anticipatcd. �nd to cvaluate whcthcr or not carth��ork and fovndation installation activitics comply with � <br /> � <br /> contract plans and spccifcations. <br /> Grosion Control and Slopc I'rotcctiun Mcasures <br /> Thc crosion hazard for thc on-sitc soils is considered modentc to high �vhen e�poscd, but thc actual <br /> crosion potential will be dcpcndent on how tl�e site is gradcd and liow wnter is allo���ed [o concentrnte. <br /> l3est Management Practiccs (I3MPs) should bc uscd to control crosion. Arcas disturbed during �� <br /> construction should bc protcctcd from crosion. Grosion control mcasures may include divcrting surfacc <br /> water away Gom the strippcJ or disturbed arcas, and away Gom the stecp slopes. Silt fenccs or straw <br /> bales cotdcl bc erccted to prevcnt muddy �vater Gom Ieaving tl�c site or flowing ovcr thc slope. Plastic <br /> shccting could bc uscd to cov«�.���-�uo�, ��-�us��,d 5�o��;p�i�s d�����,,:n���o�s oe�.��c ���cather. Disturbcd <br /> INELSON GEOTECHNICAL ASSOCIATES, /NC. <br /> I ��Z2 <br />