2007-11-28 CC Packet - Laserfiche WebLink

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16. Vehicle-Related Air Emissions. According to the air quality impact analysis completed by SBP Associates, Inc. provided as Attachment 3 to the EAW, carbon monoxide (CO) levels are elevated near roadway intersections due to the emission of this pollutant from the vehicles idling and passing by the redevelopment area. The State of Minnesota has ambient CO standards that are designed to protect human health and the environment. The Standards are: · l-hour average: 30 parts per million (ppm); and · 8-hour average: 9 ppm. Concentrations near or above these levels are most likely to occur near intersections that have heavy traffic volumes and are severely congested. With the proposed area roadway improvements, severe congestion problems that could cause air quality problems are not expected to develop at the major intersections near the project. 17. Stationary Source Air Emissions. Emissions from structures proposed at the site are not expected to be significant. 18. Odors, Noise and Dust. Dust and noise will be generated by equipment and machinery during construction. Odors may also be generated from construction equipment exhaust. Equipment will include trucks, backhoes, graders, compactors, excavators, bobcats, cranes, loaders, compressors, and possibly de-watering pumps. Dust may be controlled by daily cleanup of the construction site; water will be used to wet appropriate surfaces to reduce airborne dust when necessary. Noise and odor impacts from construction equipment will be controlled by ensuring the equipment is properly muffled and in good working condition, and by restricting the hours of operation to daylight hours, or those permitted by local ordinances. The project proceeds through residential neighborhoods and is adjacent to numerous residential yards. Construction of the project is anticipated to occur in phases over a five-year period. Phases of construction in anyone area are expected to be completed over one construction season, approximately seven months (May through November). SBP Noise Impact Analysis SBP Associates, Inc. (SBP) conducted a traffic noise monitoring and modeling analysis for the proposed downtown redevelopment; the report was provided as Attachment 3 to the EAW. The modeling analysis used the MNDOT Minnoise computer model and traffic predictions prepared by Bonestroo. Additionally, SBP conducted noise monitoring at two locations near the project site. Predicted Daytime Noise Level Discussion The results indicate that the modeled residential building receptor locations are predicted to have noise levels within the State standard for the year 2012. Locations R3 and R6 (shown on Figure 1 of the noise analysis in EAW Attachment 3) are at or above the standards with 2030 traffic volumes. This indicates that there would be some speech interference from the traffic noise for persons outside on the street side of these buildings during 2030 peak traffic periods. The predicted noise level changes between the existing and year 2012 result from additional traffic generated by the development and by other area growth. The noise level increase for this period is predicted to be 3 dBA or less at all modeled receptor locations. The MPCA considers changes of 3 dBA or less to be imperceptible. Centerville Downtown Redevelopment Page 29