RBF CONSULTING 1 - 2007 - Laserfiche WebLink

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City of Santa Ana Proposal for 601 North Parkcenter Drive Initial Study and Mitigated Negative Declaration The noise monitoring survey will be conducted at up to four separate locations to establish baseline noise levels in the project area. Noise recording lengths are anticipated to require approximately 10 minutes at each location. The noise measurements will evaluate noise exposure due to traffic while accounting for local topography, shielding from existing structures, and variations in travel speed. Construction -related Noise. Construction would occur during implementation of the proposed project. Noise impacts from construction sources will be analyzed based on the equipment, length of a specific construction task, equipment power type (gasoline or diesel engine), horsepower, load factor, and percentage of time in use. The construction noise impacts will be evaluated in terms of maximum levels (Lmax) and hourly equivalent continuous noise levels (Leq) and the frequency of occurrence at adjacent sensitive locations. Analysis requirements will be based on the sensitivity of the area and the Noise Ordinance specifications of the City. RBF will provide a discussion of off -site truck hauling, if required, for construction -related soil import or export, focusing on haul routes affecting sensitive receptors. Stationary Noise Sources. Potential effects of existing off -site noise sources will be evaluated based on the City's land use compatibility standards. Compliance with applicable noise standards will be evaluated, with recommended mitigation measures included where appropriate. Traffic Noise. The proposed project is anticipated to generate new vehicular traffic trips from future growth. On -site and off -site noise impacts from vehicular traffic will be assessed using the U.S. Federal Highway Traffic Noise Prediction Model (FHWA- RD-77-108) and TNM2.5 (if necessary). The analysis will focus on noise impacts associated with the development of the proposed project. Model input data will include average daily traffic volumes, day/night percentages of autos, medium and heavy trucks, vehicle speeds, ground attenuation factors, and roadway widths. The 24-hour weighted Community Noise Equivalent Levels (CNEL) will be presented in a tabular format. Traffic parameters necessary for the model input will be obtained from the traffic study. This scope assumes that architectural mitigation will not be developed (i.e., window glazing specifications, soundwall design, etc.). 3.2 HYDROLOGY AND WATER QUALITY RBF's Stormwater Management Division will prepare a hydrology and water quality analysis to address the surface hydrology and drainage associated with the development project at a level of detail to satisfy the CEQA requirements, which include primarily (1) runoff water quantity, (2) drainage infrastructure requirements, and (3) surface water quality, based on the following scope of work. Review and Research Existing Reports. RBF will provide research and investigation to compile existing literature and reports previously prepared regarding the tributary watershed and drainage systems impacting the approximately 601 North Parkcenter Drive Mixed Use site located in the City of Santa Ana. Research shall include review of previous engineering hydrology studies and drainage master plans, which specifically encompasses or address the site. This task also includes an initial JN 10-105908 • 3 0 August 8, 2007