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A mitigation analysis was performed to gauge the effectiveness of a 20-foot noise wall placed at these receptors. The mitigation analysis revealed that a 20' noise wall at the location of Wall #1 is an effective noise mitigation alternative. Wall #1 also meets the Mn/DOT cost criteria of $3,250.00 per decibel of reduction per residence, making it economically reasonable. Based upon the location of the modeled Wall #1, taking into account the proper setback, sight lines, and location, Wall #1 is also a feasible noise mitigation alternative. Taking this into account, a noise wall should be considered in the location of Wall #1 for design and construction. As the final design stage of this project progresses, the noise analysis may need to be refined to take into account any major design changes. The construction materials, exact location, and height of this wall will be finalized during the detail design process and/or during the development of the noise exemption request, which will include coordination and timing of the construction with the City and the affected neighborhoods. In this project, future noise levels exceeded both the Federal Noise Abatement Criteria and the State Noise Standards at many sensitive noise receptors. Therefore, noise abatement measures are proposed and are included in this analysis. The TH36 roadway improvements must comply with both the State of Minnesota Noise Standards and the Federal Noise Abatement Criteria. However, as stipulated in Minnesota Statute 116.07, Subd. 2a, the Rice Street and County Road B improvements are exempt from the state noise standards. To do this, all reasonable and feasible noise mitigation measures are planned as a part of the project. Even with these noise mitigation measures, the Minnesota Noise Standards are exceeded at locations south of TH36. Therefore, a Noise Standards Exemption Request is required to be submitted to the Commissioners of the MPCA and Mn/DOT. This document is a means of demonstrating that all reasonably available noise mitigation measures are employed as part of the project. ' Mn/DOT Noise Policy for Type I and Type II Federal-aid Projects as per 23 CFR 772 Authority: 23 U.S.C. 109(h), 109(�: 42 U.S.C. 4331, 4332; and 49 CFR 1.48(b). Noise Analysis RAMSP 105803 TH 36 and Rice Street Interchange Page 8