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.. _,y ' w«hzzxa <br /> � <br /> �C � , <br /> H � <br /> > H C :..m :� ._ .-• <br /> t� - �j <br /> G�y ,�,� deYs Millwork Sa�•;,�.y, Southpointe Industrial �rk . <br /> �p � $e g, an is Associa es, nc. , . Page 2 <br /> ro�� � <br /> N <br /> �� <br /> �d Por construction of the barrier. Since we only need a 5 to 6 dB <br /> ��� c:.uuct:.on, a material such as 3/4 inch tongue and groove plywood ! <br /> �„ would provide more than enough mass to act as an appropriate I <br /> acoustical barrier. This material corresponds to a surface <br /> s�y� density of 2.5 lbs. per sq. ft. , wh_ch should be used as the I <br /> H minimum alZowable surface deneity for the combined materials of i <br /> �tn , the barrier. The north edge of the screen should be attached to <br /> �y t.*.e building and a west leg should be added to block the noise of <br /> � � the dust collector in all directions but the south. A raugh <br /> y� sketch of the screen is ir.cluded with tnis lette+^. <br /> O rn <br /> --" — IF the acoustical soreen is built as described, the expected i <br /> attenuation is between 6 to le dSA. Resultinq sound levels of <br /> - the dust collector at the property to the n�rth should therefore <br /> be between 55 to 59 dBA. <br /> Please call if I can answer any aues�ions or provice additional <br /> inFormation. <br /> ,__a; regards, <br /> Mi ael R. Ya ' , P.E. j <br /> '�, MR :lss � <br /> i <br /> " _ S:\earfi0\M�YSSol.dee '. <br /> � <br /> I ' <br /> ��� � <br /> ' 1 <br /> '_' . I <br /> �' <br /> 1 <br /> ' <br /> 1 <br /> ' ' <br /> 1_' <br /> � <br /> � � <br /> � <br />