Appendix A Noise Study Report - Laserfiche WebLink

Home Browse Search

6. Existina Noise Environment • East of Fairview Street and North of the Santa Ana River (Receptors R-85 through R-92): Land uses in this area include single-family residences and commercial and light industrial uses. Land uses in this area range from 2 ft higher in elevation than Fairview Street to approximately the same in elevation as Fairview Street. Currently, a 6.7 ft high existing wall along the private property line shields the commercial use. The single-family residences were evaluated under Activity Category B, which has an exterior NAC of 67 dBA Leq. The commercial and light industrial uses were classified under Activity Categories E and F, respectively, for reporting purposes. • West of Fairview Street and North of the Santa Ana River (Receptors R-68 through R-84): Land uses in this area include single-family residences, vacant land, and commercial and light industrial uses. Land uses in this area range from 2 ft higher in elevation than Fairview Street to 9 ft lower in elevation than Fairview Street. Currently, 6.7 ft to 10.7 ft high existing walls along the private property lines shield the single-family residences. The single-family residences were evaluated under Activity Category B, which has an exterior NAC of 67 dBA Leq. The commercial uses with no outdoor frequent human use areas were evaluated under Activity Category E for reporting purposes. The vacant land and light industrial uses were classified under Activity Category F for reporting purposes. 6.2. Noise Measurement Results The existing noise environment in the project area is based on short-term (20-minute) and long-term (24-hour) noise level measurements. 6.2.1. Short -Term Monitoring The primary source of noise in the project area is vehicular traffic on Fairview Street. Short-term (20-minute) noise measurements were conducted to document existing noise levels at 15 representative receptor locations in the project area. Short-term noise level measurements were conducted using Larson Davis Models 831, 824, and 820 Type 1 sound level meters. Table 6.1 contains the results of the short-term noise level measurements along with a description of the physical location of each monitoring site. These short-term noise measurements were used to calibrate the noise model and to predict the noise levels at all 92 modeled receptors in the project area. The short-term monitoring locations are shown on Figure 5-1. The concurrent traffic counts and observed vehicle speeds are provided in Appendix A. The noise monitoring results for each monitoring site are included in Appendix C. 32 Fairview Street Improvements from 9th Street to 16th Street and Bridge Replacement Project Noise Study Report