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Gcotcchnicalla�ginccring Lcttcr <br /> Hcttingcr Gr:�ding and Urainagc Kc��ic��. <br /> G��crett, Washington <br /> NGA I�ilc No. 7S1GOS <br /> July 29, 2009 <br /> Pagc 3 <br /> appro�imatcly Ihrcc to four icct iall and appcars to bc constnictcd adcquatcly. 'fhc cntire si�c <br /> should bc monitorcd during thc ���ct scason, and ���c should bc contactcd immcdiatcly if pondin� <br /> or slanding ���.dcr is noliced in tl�c vicinity of ihc drains, or if any soil mov:mcnt or slopc failures <br /> arc obscr�•cd. <br /> \Vc obscn�cd :m arca .ilong thc top of slopc in thc northcastcrn corncr of thc sitc dtat had becn <br /> cxcavatcd and backlillcd ���ith rccydcd concrctc. 'I'his �vas ihc lo;ation of thc rcmovcd block <br /> wall. �Vc rccommcnd tliat tl�c rccyded concrctc bc removcd. Wc rccommcnd that thc slopc lo <br /> Ihc north of thc housc bc restorcd tu prc-constn�clion conditions. All disturbcd surfaccs should bc <br /> covcrccl witli crosion control and ��cgctation. Nalcr should not bc allo���cd to rcach lhc slopc. <br /> Any rctaining �vall and/or sulicturcs plam cd ���ilhin thc slopc sclUack shoulcl bc spccitically <br /> dcsigncd and c��aluatcd. <br /> Along thc wcstcrn propci1�� liuc, thc cut I'or �hc bascment ���as madc ���ithin about onc foot of an <br /> csisting approsimaic 6-loot tall rockcry. A small kcystonc wall is planncd along tltc wc�lkway <br /> around thc housc. It is extreiucly impo�lant that addilional soil not be rcmoved from Ihis area <br /> during thc constn�ction of thc kcystonc ���all. 'l�hc backlill (or thc ���all should cxtcnd a minimum <br /> of onc loot abovc thc bottom of thc cxisting rockcry to crcatc morc protcetion and cmbcdmc �t for <br /> 1hc bottom of thu rockcry. Also, a trcc stump is locatcd in thc arca �vhcrc thc kcystonc wall is <br /> planncd. \Vc rccomnund that thc stump not bc rcmo��cd. 'I�hc stump can bc cut back to allo��� <br /> room for lhc �vall,but no morc of Il�c slump should bc rcmo�cd than nccdcd. <br /> USE O�'CIi1S LGTTER <br /> '1'I�is Ictter Ims becn prepared for \1r. Douc I lcttingcr, and his agents ta aid in the underslanding <br /> of thc conditions obscrvcd on ihis sitc only. 1'his cvaluation is based on cottvcrsations ���ith you, <br /> � sitc visit, and revic��� ol' pliotos, and should not bc constnicd as au in-dcpth gaxcchnical <br /> asscssmcnt oC Ihc sitc or a dclailcd craluation of slopc stability. Our kttcr, conclusions, and <br /> iuleq�rctations shotdd nol bc constn�cd as a���arrauty aC subs-urlacc conJition,. <br /> rill pcoplc wlio o�en or occupy hontcs on hillsidcs should realizc thal landslidc tnocentcnts arc <br /> ahaays a possibilily. 'I'hc laudo�cner should periodically inspect �he slope, especially atter a <br /> NELSON GEOTECHNICAL ASSOCIATES, INC. � <br /> �� <br />