2623 VIEWCREST AVE CLEARWIRE ANTENNA 2018-01-01 MF Import

Clcarwirc Page 2 WA-SN0200•B View l:rest Pole Predicted Equlpment Noise Levels The new equipment consists of one ClearWire I�-4000VS Site Support CabinE:, which according to manufacturer data has a 55 dBA noise level at 5 feet. To predict the equipment noise levels at the receiving property lines, this survey used the methods established by Air-Conditioning and Refrigeration Institute (ARI) Standard 275 da!ed 1997. "Application factors" such as location, height, and re0ective surfaces are taken into consideration to predict the sound level at a specific location. The nearest receiving property is 3.5 feet north of lhe wireless facility. The predicted sound level at the nearest receiving property is shown below. Table 1 Application Factors and Predicted Noise Levels Pro osed New E ui ment Linc A Iication Factor North 1 Existin E ui ment Sound Pressure Level at 5(t. dBA . L 1 55 2 Distance Factor(DF): -� DF = 2010 dt/d2 3.5 �t 3 Predicted Noise Level at Receiver Property Line 55 Add lines 1 and 2 As shown in Table 1, thn predicted sound pressure ievel produced by the ne��equipmenl is 55 dBA at the nearest rer,eiving property,which does not meet the 45 dBA nighriime code limit. A barrier should be co�istructed around the equipment�vhich meets ihe following specifications. Sound Barrier Fence The required tence should be Gfeet high and constructed from conUnuously solid 'h" piywood or other material with a surface weight of 2.5 pounds per square foot. Tl�ere should be no gaps or joints in the fence. The inside of the fence should be lined with sound absorbing Quash rigid foam board QFR 2"thick (avaiiable from Forrest Sound Products, (425) 646-9703). This assembty will provide an additional 10 dBA reduction, bringing I:he noi;e level at the nearest receiving property down ro the 45 dBA limit. If you have any questions or require furiher in(ormation, please feel iree to call. Sincerely, SSA Acoustics, LLP Alan Burt ACOUSTICAL CONSULTANT ( '��/