3110 W MUKILTEO BLVD VERIZON 2018-01-02 MF Import

Ju1�25-02 11:15A i �. P-O2 OAVA Acoustics :t STI MMART • STRASM • AIT ALLAOUA Stricker Cato Murphy Architects, P.S. Mr. James Blissett 120 Lakeside Avenue Suite 310 Seattle, Washington 98122 Re: Acoustical Report — Verizon Mukilteo R S. U. 3110 W. Mukilteo Blvd., EvereN, Washington 98203 1 6042 Seaview Ave. NW, Su t 102 Seattle, WA 96107 Phone: (206) 8394819 Fax, (208) 83OM24 July 24, 2002 This is a report of a predicted noise survey performed in the immediate vicinity of the proposed telecommunications facility, at 3110 W. Mukilteo Blvd., Everett, Washington. The study area extends from the proposed site location to the nearest receiver property lines. Th- purpose of this report is to document the extent and impact of the acoustical changes due to the proposed Verizon mechanical equipment. This report contains data on the existing and predicted noise environments, impact criteria, and evaluation of the data as they relate to the criteria, and acoustical recommendations for improvement if appropriate. The proposed site is zoned residential — noise control district I, and so are all receiving properties. The Everett Municipal Code section 20.08.040 Noise Control Code - Environmental sound — Maximum permissible levels limits to noise levels at the receiver property lines to 55 dBA during daytime and 45 dBA during nighttime 10:00 p.m. to 7:00 a.m. (9:00 a m. on weekends). It is our understanding that the backup generator will be used only during an actual power outage for emergency purposes. As per EMC 20.08.100 Noises exempt — At ant times — Partially exempt noises, the backup generator is exempt. In addition, the new backup generator will be located within the building and have sound attenuation measure although they are not required by code including a muffler with higher acoustical properties, acoustical louvers, and lined ductwork. The oredicted noise level from the backup generator exhaust is 59 dBA at the nearest receiver property line. All remaining equipment operates 24 hours and is therefore subject to the nighttime noise limit of 45 dBA. The existing noise environment at the proposed site is primarily the result of traffic noise. A -scale frequency -weighted sound level measurements were taken July 9, 2002 to document the existing ambient noise levels. Sound level measurements were taken using a Larson -Davis 2900 real-time spectrum analyzer, Type I measuring device as U4