1004 59TH PL SW 2016-01-01 MF Import

Noise Assessment: Broadway Apartments Project Michael R. Yantis Associates Inc., P.S. Page 7 Mitigation Option 2: Construct a fence, six foor minimum height. We have investigated the noise reduction of a typical Dally Homes subdivision fence, built with 6 foot, nominal 1 inch fence board. The fence for which we measured noise barrier performance is located at The Village development in Klahanie. The fence is'built with no gap at the bottom rail, and the fence boards are tight to each other. Under these conditions the fence was m,;asured to reduce noise by 6 to 8 dB. Exterior noise levels at second floor bedroom windows will not receive as much barrier noise reduction since the effective height of the barrier will be less than at grade level of the lot. For houses with varying distances to the barrier fence (different setback distances), our calculations estimate a fence barrier reduction as follows: Setback Fence Noise Reductio.: 25' 4 to 6 dB 20' 4 to 6 dB 15' 3 to 5 dB All building lots will achieve the required 4 dB minimum level of noise reduction using a six- foot fence except lot #65, where less that. 4 dB reduction is expected with a 15 or 20 foot setback. An increase of 2 feet in fence height should improve the noise reduction by 2 to 3 dB for this lot. Alternati\'a, the setback could be increased.