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� �J��,(�_�.'l'77 <br />In response to the Environmental Checklist for the_ <br />Olso� Apartment Building Proposal, the following <br />comments were received via telephone conversation <br />with Dave Saunders of the Department of Ecology, <br />a Noise Specialist: <br />1. The building must be designed to limit noise on inside walls <br />to 35 DBA. This is especially critical in sleeping areas <br />to protect against sleeo interference. <br />7.. Walls with windows can be designed to accompl.ish this goal <br />(meet the noise reqvirements) Uut may necessitate the use <br />of double glaze or thermo-pane windows. The area of <br />window exposure is critical and must be considered in the <br />design. . <br />3 <br />4. <br />Peaks of noise are the main problem, and,the building must <br />be designed to counter peaks of 85 DBP.. <br />Reflected noise should be considered in the design (noise <br />reflected from surrounding residential structures). <br />5. An "L" shape design facing Madison would result in a <br />"Canyon Effect" to intensify the noise problem. An "L" shape <br />design facing inward would minimise noise. <br />6. The greater the building setback the more noise will be <br />minimised. <br />�,:F. ��.,.:;�:,�>�; <br />CITY OF <br />everett <br />C�TY H.�LL • ISY-0933 <br />[V[qCTT. W�SMINGTON <br />ae:oi <br />r <br />