BRODY, TODD D.B.A. SYNECTECOLOGY 1-2002

Home Browse Search

.. SCOPE OF SERVICES PROJECT UNDERSTANDING The proposed project entails modifications to local roadways in the Ci ty of Santa Ana French Park area. Specifically, the proj ect includes three complete street closures and one semi-diverter. Both Spurgeon Street and French Street are to be closed at Washington Avenue while Washington Avenue is to be closed at Poinsettia Street. Additionally, . Wellington Avenue would receive a semi-diverter at Poinsettia Street. This will then cause a redistribution of vehicles through the project area and could raise noise levels along the roadways that will receive augmented traffic. If the project requires the subsequent const"ruction of cul-de-sacs, site construction will entail the use of heavy equipment with its attendant noise. To determine potential the City has requested the project area. The using this baseline, residents. noise impacts of this traffic redistribution, that Synectecology perform a noise study for study is to examine baseline noise levels and assess any potential impacts on the local ANALYSIS The analysis shall include an on-site noise survey. It is our understanding that the City has installed temporary diverters causing a redistribution of traffic. This redistribution has raised traffic levels along some routes while reducing it on others. Synectecology shall perform a field survey to determine the locations of sensitive receptors and obtain noise level measurements at as many as eight locations. These measurements will be used to document the current, with project noise levels. Measurement locations to be monitored shall be developed both through contact/meeting with the City and in the field. Using vehicle count data presented by the City, current traffic noise within the improvement areas will be modeled using the Caltrans Sound32 version of the FHWA Highway Noise Prediction Model. The accuracy of the model shall be verified and calibrated, as necessary, using the noise levels obtained on-site. Using the noise data obtained in the field study, the Sound32 Noise Model will then be used to determine the level of noise that would have been produced before the diverters were installed. This pre- project noise shall then serve as the basis for the impact assessment. Impact criteria shall be based on the goals of the Noise Element of the City's General Plan as well as criteria typically used for significant increase for the purposes of CEQA analyses (e.g., 3 or 5 dBA CNEL increase)-:- Appropriate mitigation measures will be developed as necessary. .