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

Noise P ssessmenC Broadway Apartments Project Michael R. Yantis Associates Inc., P.S. Page 4 TABLE 1 Short Tenn Measurements I Curb Elevation 1998 Distance AhoveRoadway Leq Ldn Ldn Location (feet) (feet) (dBA) (dBA) (dBA) A 30 10 54 64 69 B 15 5 48 58 63 C 60 0 46 56 61 D 30 -10 48 56 61 PREDICTED 1998 NOISE LEVELS Traffic volumes have been increasing in the arca and are predicted to reach almost 1800 vehicles per hour (afternoon peak hour) in 1998. Current traffic volume on Merrill Creek Parkway is 650 vehicles per hour in the afternoon peak. The 1998 traffic volume will increase the hourly Lcq and the 24 hour average (Ldn) noise levels by about 5 dB. The predicted average noise levels for the year 1998 are shown in the last column of Table 2. Measurement locations A and D were set back the same distance from the roadway but were taken at different elevations. Differences between measured noise levels at these two locations reflect the degree to which ambient noise levels at this site vary with changes in lot elevation. Noise exposures at lots 49 through 65 (nearest the roadway) for exterior use of rear yaris will be less than predicted at Location A, which is elevated 10 feet above the roadway. All these lots are below the roadway elevation and arc exposed to less noise. Measurement D indicates a maximum 8 dB reduction for below road grade building sites. At the rear or side yards of lots along Menill Creek Parkway, we estimate that the year 1998 noise )eve,'; (Ldn) will range from 63 to 65 dBA (4 to 6 dB less than the 69 dBA Ld at Location A) due to a combination of noise reduction from the embankment barrier for situs below the roadway elevation and noise reduction from setback distances which are slightly farther from the road than measurement location D.