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02I08I2000 1 4: 3 7 612-341-2124 SIRNY ARCHITECTS P A G E 0� <br />FEH �fj � 1�'� FK L J HFtFiSLNU H551J�, b1GJJl�+J !C I u J'+1L1L'i i�VJ' VJ <br />Richard Chrisle�sen on Midlaad H'�Us County Club Sound Levels <br />8 February 2000 <br />Page 2 <br />Es�s�ed Somia Level trotq 8snd in Club House <br />At the property line. it can be seeu that the lcvcls are expected to be below the MPCA SO <br />dBA standard for both the e�sting and new club bouses and therefore sbould be in <br />compliance with t�jd Stace noise st�ndards. For the existing club house!, the sound level is <br />estimated t0 bC 3 dBA below a typi�al nighttime 40 dBA ambient level whtn tbc <br />windows art closed but 7 dBA above whcn the windows are open. This difFcreace above <br />the typical nighttime ambient level couJd explain why the band cSt� be 6eard when the <br />windows a�e o�ect at the existing ciub house. The predicted sound 1cvcJ is e�tpectcd to be <br />8 dBA below a Ly+pical nighttime ambient lcvel of 40 dBA with �e new club house even <br />though it is closer, since the exterior wall and window construction will provide grcater <br />sound attenuation. At the homes, the sound l�vel with the existing club ho�ssc ��td <br />windows opea is estunated to be 4 d8A above the typical nighttime amb�tnt level, while <br />tho proposed Clqb house will be 13 d$A below the typical ambient level. If strong <br />amplifieativa of eowld such as a rock band occurs in the club houx, the levels could be <br />higher than those in the te�Ie. For typical music programs expeeted in the club house, the <br />new con�trucaon should p�+pvidd improved attenuation characoe�risties and keep future <br />sound levels well b�low t6e state noise standards and below a typical nrbat� nighttime <br />ambient kvel of 40 d,BA. <br />Sincerely, <br />, � _ � �~� <br />��� <br />David ��aglau <br />Resident <br />cluistensen-letda 200012 <br />** TOTA� F'fIGE.03 ** <br />