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2009-0�-28 09:31 The Boeing Company 4252947864 » <br />Octobcr 30, 2008 <br />5016 Nichols Place, Bvcretl, Washington <br />G-2486 <br />Pagc 2 <br />A 4-inch diameter perforated PVC pipe was installed behind the wall, �vithin the crushed rock <br />2one, at the ba�e of Uic wall, per the projcct pla»s. The drain pipe was tightlined to the of7'-site <br />sewcr systcm. We wtderstand tlia[ dtc contractor obtained a separatc sc��rr pcmiit 1'or this work <br />and perfonned this u•ork undcr thc supervision of the city inspector. <br />Yer the owner's direclion a smpll 3-foot tall landscaping rockery w�is constructed northwest oC <br />thc ncw Kcystonc wall. The rockery rocks were poorly stacked per our fie(d report dated August <br />18, 2008. Since that time the rockery has been re-constructed by an esperienced rockery <br />coiitractur. 13ascd upo�i our sitc visit on Octobcr 30, 2008 thc rockcry appcars to consist of <br />�cceptaUlc 2 w 3-m�n sizc rucks wliich ure stackcd in a stablc configuration. !t is our opinion <br />that this new rockcq� will pro��ide acceptable erosion convol fur the slope at the base of the new <br />rctaining wall. <br />At thc time of our sit�� visit on Octobcr 30, 2008 landscaping belo��• the new wall coasists of <br />beauty bnrk nnd clean cn�shed rock areas. Abovc the retaining wall dic disturbcr? yard area is (7at <br />and has not yet been landscaped, hu�aaver, Uecause this area of yard is flat there s no currCnt risk <br />oCerusion. <br />ln sununary, it is the opinion uf GGO Group Nor�htvest, Inc., that the subjc•�t Keystone Retaining <br />wall was completed in �ccordance ���ith the permitted project plans and our gcotcclmical <br />rcconm�endations. <br />If you have any questi��ns please feel free to call us. <br />Sincrr�ly, <br />G�O GROUP NOR'1'H\VI:S'l', INC. <br />i� , ��-`,_ �•-'�n_ <br />ndam Gastai <br />Yrojcct Lnginccr <br />, <br />� .�eeU�C=�.. �G'��y/� <br />�Villinm Chang, P.E. ( <br />Principal <br />C:LO Group Norll��rest, Inc. <br />P 3/3 <br />��3 <br />