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The projected Year 2020 average daily trips (ADT) demands with and without the proposed project are as follows: Insert - Additional traffic study as part of I-35W Corridor Coalition 35W Capacity Study to be completed by May 2001. Based on the 1997 EA W, the proposed Twin Lakes redevelopment project was expected to result in no significant traffic impacts. Several of the traffic impacts identified in the analysis were attributed to the background traffic conditions and would be expected to occur without the Twin Lakes redevelopment. The minor traffic impacts imparted by the redevelopment project are expected to be mitigated by constructing exclusive right turning lanes at selected intersection approach locations. The potential air quality impacts of the proposed Twin Lakes redevelopment were identified by modeling future traffic flow and the resulting carbon monoxide (CO) concentrations in the project area. The air quality analysis was based upon traffic forecasts developed for 1997. The total predicted CO concentration at a specific location is a function of the background CO levels (derived from air quality monitoring) and the local CO emissions (determined through modeling). Impacts are identified by comparing the predicted CO concentrations to the applicable state ambient air quality standards. The results of the air quality analysis indicate the maximum predicted CO concentrations occurred at the northwest quadrant of the Snelling/County Road C intersection. All of the predicted CO concentrations are below the applicable state air quality standards. Based upon these results and the higWy conservative nature of the analysis methodology and assumptions, it was concluded that the proposed Twin Lakes redevelopment proj ect will not have air quality impacts significant enough to cause a violation of state CO standards. XVII. Stationary Air Emissions The new buildings proposed for Twin Lakes will likely be heated by natural gas mechanical systems. The projected emissions from such systems will include small amounts of carbon dioxide, nitrous oxides, and very small amounts of other byproducts. All emissions are expected to be far below thresholds for new source permitting. Effects on air quality from the project are expected to be negligible. All tenants will be required to obtain any required air emission permits. XVIII. Noise In the 1997 EA W, noise levels were estimated based on PM peak hour traffic volumes on Fairview Avenue, Lincoln Drive and Snelling Avenue, The forecast noise levels are intended to represent the peak daytime (7:00 AM to 10:00 PM) traffic hours. The majority of the proposed land uses for the Twin Lakes Development will operate during normal office hours (8: 00 AM to 5: 00 PM) and will generate less traffic during nighttime (10:00 PM to 7:00 AM) hours. Therefore, no analysis of nighttime noise levels were conducted. 17