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02/08�2000 14:3� 612-341-2124 SIRNY ARCHITECTS P A G E 82 <br />FE}� ��� 1�;� f,K �% ��..���) }�SLIL tl1GJJ1wJ tt � U J41G1G`� �.UC� GJ <br />� ��/ <br />�■■aai�pN� �fOO�pO��d <br />1313 5u+ strwc sa, • eu� �JQB • minneepo�iv. r'nn �414 <br />t�l�pf�or+�� 012+�9�49'79 • fix: 612���.J'1' -4572 <br />8 February 2000 <br />Richard L. Chtitbensen <br />Pazqiets � simy ATCbitects <br />333 Wachi�gton Avenu� N. Suite 100 <br />Minn�apolis, MN 55401 <br />RE, Midland Hills Country Club - Discussion of 1'otential Sound Levels <br />Dear Ri�hard: <br />This letter discusses potential sound levels associated with typical bands that could <br />perform in the existing and proposed itltuTC club houses at the Midland Hills Country <br />Club in Roseville, Miz�ncsota. <br />A very pnliatinary comparison has been made between the sound level from an <br />acoustical band playing in the club house adj�emt to the residential at�s east of the <br />country club. This comparison is based upon a typical sound level of 85 dBA from a <br />band. Assurnpaons � to the sound atC�IIU�ion of existing and future wa11s and windows <br />are based upon jltdgmenta� estimates and are not based upon actual data. However, these <br />values should be sufficient for purposes of a genesal coT[ipaii80n of sound levels. <br />Sound levels w� estimated at the properiy line to the e�st and at the nearest homes to <br />the cast. The MiDrietOta Pollution Control AgOIICy noise standarcv are evaluated at the <br />�ocation of nearest human activity. Tt�a most c�itic.31 noise standard is the I.SO, or level <br />exceeded S0� or 30 minutes of any hour, �ad is equal to SO dBA during the nighttime <br />hours after 10 pm. For purposes of comparJSOa, a typical nighttime ambient sound level <br />i n Ihe neighborhood of 40 d$A has also be�n assumed. <br />The sound kvel at the property line and the homes can be estimated by starting with �he <br />sound source, adding a"penalty" because of the potentially lower irequencies associated <br />with the band, aad subti'acting tb� exterior wall �ttten�ati0n and attenuation with distance <br />from the cIvb house. Each of these factors is taken ip to account in estinwtiag tbe sound <br />lovel for the e�sting club house with windows opep and closed, and for the future club <br />house with windows closed (since they will not be operable wiDdows), T6e results are <br />sutitrnBCiZed in the table on � following page. <br />