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f <br />Grntcchnical laiginecring LcUcr <br />i732 Sound A��cnuc Slopc 13valuation <br />I;ccrcu, \Vashington <br />NGA �ile No. 8G5712 <br />Dcccmbcr19,201_' <br />Pnge 4 <br />Under no circumstanccs, should water be allowed to ilow over, or conccntnte on tl�c slopa \'Vc <br />rccommcnd tliat storniwa�cr nmoll' Gom thc roof d�.�ins. pa��cd arcas, and yard drains bc collccted and <br />ti,_htlined to a sui�ablc discharge point. 'Che slope should be protected lium crosion. \Vc recommcnd that <br />;dl disturUed arcas and arens of exposed soil on thc slope bc replanled with ��cge�ation lo re-cstablish <br />�cgctation as soon as possible. No lill m'stniciures of aiiy sort should be placed ncar the top of this slopc <br />�cithimt a spccific c��nluation. Storm�vatcr iunoff sliould not bc nllo�ccd �o conccnintc or flo��� oacr thc <br />slopc. <br />Protcclion of Ihc slccp slupc and buflir nrc;ts shauld bc per(orntcd as rcquircd by Ihc City of G��crcu. <br />Spc�ifically, wc rcconuucud tliat thc sctback as �vcll as thc stecp slopo, uot bc diswrbcd or modificd <br />!hrough placement of a�ty fill or removal of the esisting vegetation. No material of any kind should bc <br />placcd on tl�c slopc or bc allowcd to rcach thc slopc, sucli as excavalion spoils, lawn clippings, and athcr <br />y.ird waste, u:�sh, or soil stockpiles. 'Precs should nol be cut do���n or remo�•ed Gom thc steep slope unless <br />a mitigation plan is dc� clopcd, such as thc rcplaccmcut of ��cectation for erosion protcction. Rcplaccmcnt <br />ol' vcgc�ation shotdd bc perfonncd in accordancc �vith Ihc City of Gvcrett codc. Any proposcd <br />dc��clopmcnt ���i�hin thc sctback arcn should bc thc subjcct ofa specific gcolcchnical cvaluation. <br />Closw•c <br />NGA has prcpnrcd Ihis Icticr �br Dir. Johu 13osch :md his accnls, f'or usc in c�'nluating ihc slonc conditions <br />bclow the existing rcsidencc on this site only. "fhe scope of our work docs not include services rclatcd io <br />construction safcty prccautions mid our gcncnl rccommendatians arc not intcndcd to dircct thc <br />coNractors' methads. �echniqucs, sequcnces, Of �7fOl'C(Illfl'S, l'XCl'�)� �S S�)l'CIIICBII)� described in aur Iclter <br />lix considcntion in design. 'Chcm arc possiblc variations in subsurfacc conditions across Ilic slopc. Our <br />Icttcr, conclusions, and intcq�rctations ,hould not bc constnicd as a wamnty of subsurfacc conditions. A <br />contingcncy for unanticipatcd conditions should bc includcd in thc budgct and schedulc. <br />All pcoplc wha own or occupy homcs on l�illsidcs should rcalizc U�at landslidc movemcnts arc aln�ays a <br />possibility. 'Che landowner sliould periodically inspect the slope, especinlly a(ier a���inter stomi. IC <br />distrcss is cvidcnl, a gcotcchnical cnginccr shoulcl bc contactcd for advice on remedinVpre��entatiae <br />mcasures. Thc probability thnt landsliding �vill occur is substantially rcduccd by 8�c proper maintanancc <br />of dninagc control nreasures at thc sitc (thc nnto(f Gom all hard s-urfaccs sltould bc Ied to au approvcd <br />dischargc poinQ. 1'hcrcforc, ihc liomco���ncr should takc responsibility for perfomiing such mainicnancc. <br />NELSON GEOTECHNICAL ASSOCIATES, INC. <br />