Saticoy & Wells Community Plan & Development ... - City Of Ventura

Saticoy & Wells Community Plan and Code EIRSection 4.11 NoiseAction 7.32 also requires an acoustical analysis and mitigation prior to development of anyresidential development within the 60 dBA CNEL contour and incorporation of appropriatemitigation to reduce noise in residential exterior usable space to 65 dBA CNEL or lower andreduce interior noise levels at residences to 45 dBA CNEL or lower. Additionally, Action 7.33calls for the construction of sound walls along SR 126 in areas where existing residences areexposed to exterior noise exceeding 65 dBA CNEL.4.8.2 Impact Analysisa. Methodology and Thresholds of Significance. The analysis of noise impacts focusesupon the Project’s impact to surrounding noise-sensitive land uses and the impact of existingnoise sources upon residents of the Project Area.Roadway noise impacts were based on projected traffic volumes from the General Plan EIR forthe year 2025. Existing and future (2025) conditions were used in this analysis. To determineroadway-generated impacts, the Federal Highway Administration’s (FHWA) Traffic NoiseModel (TNM) Version 2.2 was used. Existing and future average daily traffic (adt) was usedfrom the General Plan Traffic Study. TNM datasheets can be found in Appendix D.The average daily traffic (ADT) was used for the Project Area segments and a vehicle use mixwas completed based on current conditions and compared to the FHWA 2007 Annual AverageDaily Truck Traffic on the California State Highway System report (2008) for accuracy. A vehiclemix of 90% automobiles, 8% medium trucks and 2% heavy trucks was used.Next, the ADT was converted to peak hour vehicles based on the general rule of thumb bydividing the ADT by 10. This provides a general weighting factor instead of dividing the ADTby 24 hours in a day which would skew results.For the purpose of this analysis, a significant impact would occur if growth accommodatedunder the Project would result in any of the following conditions:• Exposure of persons to or generation of noise levels in excess of standards establishedin the General plan or noise ordinance• Exposure of persons to or generation of excessive ground-borne noise levels• A substantial permanent increase in ambient noise levels above levels existingwithout the project• A substantial temporary or periodic increase in ambient noise levels above levelsexisting without the projectFor purposes of defining a “substantial” increase in traffic noise, project impacts would besignificant if the increase in noise exceeded the Federal Interagency Committee on Noise(FICON) recommendations and affects a sensitive receptor. The FICON recommendations areshown in Table 4.11-3.4.11-5City of Ventura