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Response: SRF agrees that redevelopment of the Twin Lakes area will impact the entire surrounding roadway system. Therefore, to detennine how well the existing and future roadway system will accommodate redevelopment of the Twin Lakes AUAR area, an operations analysis was completed for year 2030 build conditions at representativekey intersections. SRF conducts it operations analyses using the Synchro/Si�a�Taraf�c software, which is a macroscopiclmicroscopic softwar-e analysis tool. The SimTraf�c component provides the microscopic "real world" simulation analysis and is a holistic operations analysis. Meaning that not only are the key intersections reviewed for how they operate, but the roadway segments that link the key intersections are reviewed for capacity deficiencies. In the event that roadway segments were observed to have capacity deficiencies, they were recommended for improvement. All roadway segments have sufficient overall capacity to handle the additional traffic, except for Snelling Avenue and County Road between Cleveland Avenue and Faix�view Avenue. Recommendations for each of these roadways were made. Roseville Public Works Comment 4: On pages 26 and 64 of the SRF Technical memo�andum, the t�af�c volume on Fair-view doubles. The noise at the RI �ecepto� only inc�eases I db. Please expand the discussion in the AUAR to explain how twice the amount of t�affic does not make twice the amount of noise. Response: Explanation or reasoning for this issue is contained in the technical memorandum under the vehicle related noise analysis section; however, may not be immediately transparent. The worst hourly traffic noise impacts occur when truck volumes and vehicle speeds are the greatest. This typically occurs when traffic is free-flowing and at or near level of service (LOS) C conditions. Existing traffic volumes on �'airvaew Avenue are approaching its free-flow capacity {i.e., LOS C conditions) during the daytime peak hour. Projected peak hour traffic volumes under future conditions will exceed the LOS C free-flow roadway capacity of Fairvi�w Avenue, resulting in lower traffic speeds and lower traffic noise levels. It should be noted that this does not represent a failing condition, simply one that is not conducive for noise analysis comparisons. Therefore, the worst hour noise impact under future conditions would occur at some point either before or after the daytime peak traffic hour when traffic volumes on Faizvievv Avenue again reach free-flow capacity conditions. In order to account for this phenomenon, a theoretical LOS C capacity was assumed for Fairview Avenue. The difference between existing traffic volumes and the LOS C capacity for Fairview Avenue under future conditions does not equate to a doubling of traffic volumes (as the daily or peak hour traffic volumes n3ay indicate). Please note that sound levels are measured on a logarithmic scale. For example, if the sound energy is doubled (i.�., the amount of traffic doubles), there is a 3 dBA increase in noise. Because the difference between existing traffic volumes and the LOS C capacity for Fax�vie�w Avenue does not equate to a doubling of traffic volumes, the increase in noise is less than 3 dBA from existing to future conditions. Roseville Public Works Comment 5: On pages 79 and 80 of the AUAR, Wate� Quality: Surface Runoff, one of the benefits oft�eating the enti�e AUAR a�ea as a whole �athe� than as a�se�ies of Twin Lakes Business Park Final AUAR Update City of Roseville - October 3, 2007