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t _ • <br /> �`NCl@.?':lCtiafC]S i:: L�.+.ailalE�a. ::iC. <br /> :.:nswcants m �ouna a�a Jibration <br /> August l9. 1991 <br />� 7 ,� ,. <br /> j1� Mr. Steve Cox <br />� ° Cox Construction <br /> '� 5125 75th Avenue N.E. <br /> �);;, ,, Marysville, Washinecon 95270 <br /> �� '' <br /> ��!"'� ?' � Regardine: �Ioise Meas�rements and Recommendations <br /> �� `:,+„��-` ' Columbia Court <br /> 1 <br /> •5�'�.� <br /> ,�1, i]:i.AI." . <br /> *�� ' Dear Mr. Cos: <br /> ii��y� - <br /> : �p, _ <br /> � +� This letter presen[s the results of noise measurements and recommendarons for interior <br /> •�' ,x.:; .: <br /> ;Ar:�f��.�', <br /> �� , and exterior noise reduction for the proposed dupiex ac 6911 Columbia Courc in Everett, <br /> I�s��,,. r Washington. <br /> �� � . <br /> - ,l,�� �`: � <br /> 1I� iYl. ' �' . <br /> ; ���',`:��. :`_. . <br /> =: ,� . :�. A continuous 24-hour noise measurement was conducted on August 6-7, 1991 at the <br /> �.,;. �� �, <br /> E ; '., •, proposed duplex site using a Digital Acoustics DA607P noise monitoring system. The <br /> ;�� �` :� � measurement location was 30 feet west of the fence that overlooks interstate-� at the east <br /> ;S'`:�'� ', end of the property, and corresponds approximately to the setback of the proposed duplex. <br /> � , The noise monitor was placed at the top of the ravine that descends toward Int�rstate-� so <br /> that a reasonably clear sightline was maintained between the freeway and the monitor. <br /> The measurement data, theretore, represents "worst-case" noise exposure for backyard and <br /> ground floor locations. <br />� Due to the rapid change in elevation benveen the developmenc site and I-5, a measurement <br /> of freeway traffic noise was made with a 2-channel tape recorder. The purpose of this <br /> measurement was t� determine the difference in noise levei between first and second floor <br /> receiving locations in the proposed duplex. The measurement location was approximately 6 <br /> feet wesc of the east fence with the channel-1 microphone ac a height of approximately ti <br /> feet and the channel-2 microphone at a height of approximately 12 feet. The measurement <br /> equipme�it consisted of a Nagra [V-SJ tape recorder and nvo Larson-Davis 2541 <br /> microphones with General Radio 1560-P42 preamplifiers. <br />