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2007-11-28 CC Packet
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2007-11-28 CC Packet
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<br />16. Vehicle-Related Air Emissions. According to the air quality impact analysis completed by SBP <br />Associates, Inc. provided as Attachment 3 to the EAW, carbon monoxide (CO) levels are elevated near <br />roadway intersections due to the emission of this pollutant from the vehicles idling and passing by the <br />redevelopment area. The State of Minnesota has ambient CO standards that are designed to protect <br />human health and the environment. The Standards are: <br />· l-hour average: 30 parts per million (ppm); and <br />· 8-hour average: 9 ppm. <br /> <br />Concentrations near or above these levels are most likely to occur near intersections that have heavy <br />traffic volumes and are severely congested. With the proposed area roadway improvements, severe <br />congestion problems that could cause air quality problems are not expected to develop at the major <br />intersections near the project. <br /> <br />17. Stationary Source Air Emissions. Emissions from structures proposed at the site are not expected to be <br />significant. <br /> <br />18. Odors, Noise and Dust. Dust and noise will be generated by equipment and machinery during <br />construction. Odors may also be generated from construction equipment exhaust. Equipment will <br />include trucks, backhoes, graders, compactors, excavators, bobcats, cranes, loaders, compressors, and <br />possibly de-watering pumps. Dust may be controlled by daily cleanup of the construction site; water <br />will be used to wet appropriate surfaces to reduce airborne dust when necessary. Noise and odor <br />impacts from construction equipment will be controlled by ensuring the equipment is properly muffled <br />and in good working condition, and by restricting the hours of operation to daylight hours, or those <br />permitted by local ordinances. <br /> <br />The project proceeds through residential neighborhoods and is adjacent to numerous residential yards. <br />Construction of the project is anticipated to occur in phases over a five-year period. Phases of <br />construction in anyone area are expected to be completed over one construction season, <br />approximately seven months (May through November). <br /> <br />SBP Noise Impact Analysis <br />SBP Associates, Inc. (SBP) conducted a traffic noise monitoring and modeling analysis for the proposed <br />downtown redevelopment; the report was provided as Attachment 3 to the EAW. The modeling <br />analysis used the MNDOT Minnoise computer model and traffic predictions prepared by Bonestroo. <br />Additionally, SBP conducted noise monitoring at two locations near the project site. <br /> <br />Predicted Daytime Noise Level Discussion <br />The results indicate that the modeled residential building receptor locations are predicted to have noise <br />levels within the State standard for the year 2012. Locations R3 and R6 (shown on Figure 1 of the <br />noise analysis in EAW Attachment 3) are at or above the standards with 2030 traffic volumes. This <br />indicates that there would be some speech interference from the traffic noise for persons outside on the <br />street side of these buildings during 2030 peak traffic periods. <br /> <br />The predicted noise level changes between the existing and year 2012 result from additional traffic <br />generated by the development and by other area growth. The noise level increase for this period is <br />predicted to be 3 dBA or less at all modeled receptor locations. The MPCA considers changes of 3 dBA <br />or less to be imperceptible. <br /> <br />Centerville <br />Downtown Redevelopment <br /> <br />Page 29 <br />
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