Agmt12 Atkins North America, Inc.

Browse Search

transportation impact study that will be prepared for this project.2 A Federal Highway Administration-approved traffic noise prediction model (e.g., RD-77- 108) will be used to determine roadway traffic noise levels with adjustments to account for California Vehicle Noise Emission (CALVENO) factors for standard automobiles, medium trucks, and heavy trucks. Traffic noise levels will be quantified for affected roadway segments under existing, existing-plus-project, cumulative, and cumulative-plus-project scenarios. The analysis will determine if modeled increases to roadway noise levels would considerably affect existing noise-sensitive land uses. Modeled cumulative-plus-project traffic noise levels will be used to determine future interior and exterior noise levels on the project site. • Assess stationary noise sources (e.g., HVAC, parking) associated with implementation of the proposed project. Long-term impacts will be determined from existing documentation, standard attenuation rates and modeling techniques. Impacts will be determined at adjacent noise-sensitive receivers and compared to applicable noise regulations. • Assess land use compatibility in terms of exterior noise levels with existing and future predicted noise environments (e.g., transportation and stationary) based on applicable regulations and local agency guidance. Stationary sources of noise that currently exist in the project area will be discussed based on site visit observations, aerial photographs, and existing documentation. Consultant will discuss the types of existing stationary noise sources that are present. Stationary sources that dominate the project area noise environment will be measured and levels associated with such sources will be included in the analysis. • Include a discussion of the potential exposure of sensitive receivers to excessive groundborne vibration attributable to project implementation (e.g., use of heavy-duty construction equipment). This discussion will include a description of existing vibration sensitive receivers (sensitive land uses, and structures). Consultant will conduct a reconnaissance level survey of surrounding land uses, sensitive receivers, and historical/architectural structures considered to be potentially sensitive to groundborne vibration levels. Typical short-term and long-term groundborne vibration levels will be predicted based on documented source-specific vibration levels and standard modeling procedures as recommended by federal and State agency guidance. • Evaluate noise and vibration impacts based on compliance or exceedance of applicable regulations and guidance provided by local, state, and federal agencies. Additionally, the analysis will assess noise and vibration significance based on the generation or exposure to substantial permanent or temporary increases in ambient levels. Mitigation measures and their relative effectiveness will be provided for noise and vibration impacts that are found to be significant. 2 ADT may instead be generated using the CaIEEMod model that will be used for the Air Quality analysis. ATTY/AGR/2012.154/24 HOUR CONTRACT/ATKINS NORTH AMERICA REV:09-19-12 JS Page 17 of 26