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03122/2000 10:51 612-341-2124 SIRNY ARCHITECTS PAGE 65 MRR 22 2900 08�49 FR D BRASLAU fa550C 6123314572 TO 34I21�4 N.l34ilb Ricbard Christonse� on Midland Hills Cvunty Club Parking L ot S ound I.e��]s 22 March 2000 Page 3 EXHIBIT 6(�1961) shows the effectiveness of different heaghts of fence south of the berm. While a Q-foot fence does not appear to bc cfftcdve, a 6-faot fencc reduces the level to 3 0 dBA excep� for Site 3. This haigbt would provide attenuation similar to that expected forthc other homes inthc areaaud couldbe considcrcdthc mostcost-effecrive solution for this home. In summary, a bcrtn that is 4-feet higher than the ouirently proposed berm will provide effective sbii�lding of voices from the drop-off loop and parking l.ot for a11 of the homes to the east of the lot. If increasing thc bccm is notposs�ble because of an cnlargad footprint and inadequate space, the 4-fnot fence is a reasonable altcrnative, provid�g almost the same beacfit as the berm• The hoII►c at �1961 which is southeast of thc parking lot, can only be shielded by a fence, since there is ao space for a berm. The a�lysis suggest5 that a 6-foot high fencc should provide the sat�ae level of si�ieldin,g for this borne as the increased berm wiII provide for the other homes east of the parking lot. As noted above, the projected sound kv�l are well below the Minnesota nighttimc standards of 55 d8A L10 which would be applicable to sound such as loud speech that could occur for relatively short timxs in th� l�.te evening hours. However, a voice could be audible even when below ambient, as can any other sound that has a unique charaeteriscic including birds and animals. The previ�ion of addidanal acoustical screenimg of the parking are ean reduce the expected sound level by 6 dBA for the closest sources, therefore reducing the sound to abouto�-half its loudness. Therefore, providiagthis screening should providc a noaceabk benefit for the adjacent residential ar�a to the south and east of the parknn� lot. Sincerely, David Braslau President chns0321-Ict.doc ?A0023