1010 NORTH PARK DR 2016-01-01 MF Import

APR-16-03 15:97 FROM:EVERESi PLANNING DEPS ID=42525?8?42 PAGE 2/3 Zi er Zema� ,ssociates. Inc, Ge�u:.L�iul and F.mironmemat cooaultic` Mra. Muilyn Cfnuzhill I OI o Norch Puk Drive Everett, Washington 98203 7-1501 Apil 16, 2003 i Subject: Churchill Ruidertce Tim6a Pile Wall Replacemcat Projec; �mergency Site Stsbilization I 10�'0 North Ycrk Drive I Ev�cett, Wachington I Dear Mrs. Churc}ull � I We a�� writing to suppuft yow request to tNe City oC Everett that the refer timba pile retnining w�ll replacement pro�ea be considered,� an emergency repair/stz'.iiiutioa, Zipper Zeman� Associatee, Ine. (TZA) coinp�eted a geocechnicaI surfeac rcco �ssance uui subsur:a explorstion at the site in suppart of she proposed timba pile retniaing wall replecemrm 'ect on 11 November 2ppy. Our site observations aad iecommeadations wtte presented in 6 becemba 2002 geotechnical rep�t, Based aQ conversations with you, it was our under 'ng chat a shaliow �rficial slope tailu� }� o�� neat the retaining well since our 1 I Nove er 2002 9ite visit and [hat the wood lagging and timbe;s of thc �xisting wdj! had dcteriorated a�d were of concern. At yo rcquest, wo rwisited the site on 16 Apri] 2003 te evaluat¢ the reported chenpes in the aieo condi ans. Upon arrival, we eoaduaed e s�lrface rxon<<aissance of the wcisting timber pife and wa te retajaing wells and thc ravine slope that extmdt down to the wuthwest hom these features. Baxd oa our obsavatioas, it appears thu the timber pile wall may Lave deflected away from th housc (west) since our original site visit. We oburvcd the timba lagging to bo roKm nnd ia 4 very poor condition, Matty of the boazds could b� broken apatt by hand, The expoeed porti�s of t4e timber piles also exhibited rot and were in s yoor wndiuoa We did aot observe say significsat c]ungc in the �osting concretc retaiaing wall. Our reconnaissance of thc rwvine slopc located below the rxisting retaining walls discloaed unfavorahle conditions roLttive to slopc sta6ility. The inclinatiou of the side slope of the cavine thac in immedistely below the timb� pile and concrete walls raciga frora approximately 1.25 in 1.SH:1V (T%rizontat Vert�cal� The slope ?s mamled by approximately S feet of vay 14ose to loose eo!!��viu;n based on o�a aubrurface explorationc. Au[inQ our il November 2 2 site visit, the �l,.pe was rdatively with no evideac� of seepage oz reum slope failures. Our 16 Aprii 2003 tite visit disclosc modvate to severe sapage from �h� 91ope ebou[ 15 to ZO fect bclow the timber pile and conar walls and a recent sha]!ow siuficial slope failure on tha rdcr af 2 to 3 feet decp on the elope 'th s de{�osi[ of dehris at the bottom of tha 16905-I3f6AVeusW,swuil� ��,n.e,yw.,tiLy.,s�w5 �az+�nt-na :•twt