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r� <br /> � <br /> . ,fr.����/�I�, i�i�.:��\i��� � . <br /> �.� P'�!�\�J�l�it�, I�IC� � <br /> CONSULTANTS IN SOUND ANU VI6Rl�110N <br /> August G, 1979 <br /> Mr. Larry L. Branihall, President <br /> City Construction Canpany <br /> 1A822 N.E. 31si Circle <br /> Redmond, lJashingtan 98052 <br /> Re: Acoustical Eveluation <br /> Eleventh Drive Vlest and 17 Casino Rd. Apartments <br /> Dear Mr. Bramhall: <br /> We have been asked to examine construction drawings fo� i.i�e two reterenced <br /> apartment b�ildings to determine compliance wfth Gity oF E��erett Noise <br /> Specificalions. <br /> I ' <br /> The Noise Specification is contained in paragrapfi 3 of the Final Declaration <br /> of Nonsignificance issued b,y Dennis L. Derrickson, Director, Planning <br /> Department, City of Everett, dated July 31, 1979. The letter states that an <br /> � average noise level of 65 d8A was measured at the northeast corner of thc <br /> property (ad,jacent to SR 526) during non-rush hour traffic conditions. Tlie <br /> letter furtiier states Lhat the average noise level inside should not exceed <br /> 45 dBA, tlius requiring a 20 d4A noise reduction from outside to inside. <br /> We have reference material in our technical files showing that the noise <br /> reduction of typical residential construction (wood frame, wood siding, <br /> single-glazed windows, closed) ranges from a low of 22 to over 30 d6A. <br /> 105 W[ Sfd6 S. REEI . 5[Alllf. . WASIIIIJGION 90105 (206) 57.1-JJSO 5[NTiE I57�) 221-011p pOHTIAND <br />