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

Noise Assessment: Broadway Apartments Project Michael R. Yantis Associates Inc., P.S. Page l INTRODUCTION This report documents an acoustical study conducted for Dally Homes regarding existing noise levels at the proposed Merrill Creek platting for new home construction. Included within this study will be the results of a 24-hour measurement of existing sound levels atithe property site, comparison of measured levels to City of Everett planning criteria, and a discussion of mitigating measures. SITE DESCRIPTION The site is located near the intersection of Merrill Creek Parkway ane: Glenwood Avenue in Everett, Washington. The site is bordered on the south by the Parkway and wooded areas to the north, west, and cast. Ambient noise at the site is due primarily to traffic on Merrill Creek Parkway. Glenwood Avenue, which is located farther from the home sites and is obstructed by a wooded ridge to the east, contributes little if any to the mcasureable noise level at the home sites. Lots for eleven home sites lie directly adjacent and to the north edge of the Merrill CrCIA Parkway right of way. Homes on these lots will receive more traffic noise than other non- adjacent sites. The discussion which follows will pertain only to the noise conditions on the eleven adjacent sites unless otherwise indicated. MEASUREMENT DESCRIPTION A 24-hour measurement of existing noise levels was taker at the property site, and the hourly values are shown in Table 1. A microphone was located 3L feet north of the curb and at an elevation 10 feet above the pavement, referred to as Location A. This measurement was made using a Larson Davis 700 type 2 integrating sound level meter. In addition to the 24-hour measurement, several short term measurements were made at 45 and 60 feet from the curb and below the elevation of the roadway. Noise levels are generally reported it, terms of averaged quantities: Leq and Ldn. Leq is the energy average sound dressure level, in decibels (dB). Ldn is the Day-Night Equivalent Noise Level, which is a 24-hour continuous measurement of Leq, with a 10 dBA penalty added*to sound levels occurring between 10:00 p.m. and 7:00 a.m. See Appendix. I for a more detailed discussion of noise descriptors. Both Lcq and Ldn are measured in "A-weighted" values of