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Michael R, Yantis Associates, InC,, P,g, 1805 • 738th Piace No <br /> conn:finp in aaouetleo and vibrotbn <br /> r • $U��B 2QJr �hE99� <br /> � ���f `n� 3V�e, Waahinpton 88005 <br /> O�o��nb�r QD� 1oB, (206) 454•4283l643•9820 <br /> Mr. D�v1d Jemas <br /> On� L�k� B�Il�vu� Dr1v� <br /> O�II�vu�� Wq BBOOQ <br /> SubJ�oei Rainl�r Drivs ApartmenLe Acouottoel 6tudy <br /> D��r D�v1dt . � <br /> Thi• I�tte� addreeeae the axterlor we11 <br /> eperlmente, Included in tha evaluatian are�requiremante for exterlor perL�t1on � <br /> con�truction and YPee for the eub�eot <br /> �evN noloe meeeuremante conduotedtby Mr, B11I Stone ot the Cit <br /> ypee. The eveluatlon ie baeed on the ambient <br /> Lh� requlred lntsrior lavels of 43 dBA meximum ae epeolfied „ � <br /> �at�nntnation of Non-8i0n1fioence, SEPA 1P7-88�� y of Evereet, and ' <br /> by you. , copiae oP whlch�were Ravised <br /> T� ��L■ of ineeeuremenLa were condualod b P�Oyided i <br /> LMo rs� � tevai y Mr, 6tane. The highest Isval ot the ' <br /> oon�i�tad of of B8 d9A et the property 11ns bo tha north. Th1e msseurement I <br /> �I s�su�ed LhaL � s "'�nuta noiae aample ot4rtinp ey 2;15 m <br /> this meeeuremenE 1e rapreaantative of tha averepe eound <br /> knoNn u e� �e �. P on a waekdsy. It 1s <br /> and below thleQleveje ecbuel L�q�� thrauyhouo e t � <br /> ' ypicel day ma Iaval , <br /> y renpa 6oth above � <br /> R�v1�w of the eita plan indioatae eetbeck dfetencae renpinp upwerd from 10 <br /> fror Lhe noPth facea of Buq �dings 8 end C to 140 I <br /> � Buildlny A, A��um1n8 thet traPfic fBe� at the oloeeet aornareof I <br /> I Lh� �atbaok dietenose raeult fn ettenueLiona ' <br /> 0 � alonp ths north Pecae of Bulldinpe 8 M ndBCn�o 16hd8patmthe northwaof notee, <br /> of Qutldin oP the exLerior levele renBing from <br /> 0 A. For the current aits, onl y t h o e a w a i l e with expoeurs to Madieon ' <br /> tML er� wiL h l n q 0 f a e t of the .10 e t r,o r n e r <br /> con�LruoLion or spaolfloettone. fooL eetback llne w{� � raquirs e aoial <br /> i �oou�ticsi de�lpn, are deeipneted on theeatteohedsflpure, P <br /> � whlch do require a ecial <br /> �� �n lntarlor dse! n P <br /> ��rior 6 level of 46 d8A with axterior lavale et BB <br /> Pere�tion nseds to prov d� e e oompoetta ettonuation af et leeet 24 dg. <br /> T1�� oampo�iCa ettenuation represenie the �A� the <br /> � p��tlLion ctln�id�red e■ e whole, tncludin nofae reducLion <br /> �P� in Lha conatruotion. 0 windowa, doare, andaany�air leeketor <br /> Th� nofea raduct{one <br /> ur typicall � � °� ettenuetione, provided <br /> Y paoified in terme of the Saund Trenemleelon�Claeo,1e�efarred toPae <br /> �• Baceuee the fleid perfcrmance of oonetruotla�o ��d componente 1e <br /> laa Lhan th• laboretory veluae, the indivfduel componente. t <br /> � . tipnificantly h�ohor BTC�e then ths deeirad oompoette �eVa� � ueually <br /> YP1calIY hava <br /> In tha cese ot wall conatruotiona, tha <br /> pndominane oeuaes of the P�eBence af atr leeke ia <br /> erlor wel � � Performence degredation, Por the one ur the <br /> onatruotton ehould heva en 6TC ratin <br /> I wlnp x rem np with 1 G . Wellecnne�ruction <br /> � on the inalde e�d R_19 YPboer ehaething and etdlnp on the ouLelde, 6/8�� <br /> �infmum extarlor eurface weipht�(eheethinw1+� "'aet thie <br /> tMe quelity oonaLrucLiop preotToee are followed, requirement eeouming e <br /> e sidi�p) oP et laeet 4 Ibe/eq ft end <br /> ' V <br />