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As a part of the Noise Advisory Committee (NAC), Mn/DOT analyzed the noise walls for <br />the entire project. While some walls were determined to be reasonable (reduce the noise <br />by a minimum of 5dBA), no walls were determined to be cost effective. The City is <br />interested in the consideration of a 20' high noise barrier along the north side of the west <br />bound C/D road. The total cost of this wall is approximately $1,525,000. Mn/DOT is <br />willing to participate up to $3250 per decibel per benefiting property. This means that the <br />City could request that Mn/D�T construct this wall. In doing so, Mn/DOT would contribute <br />approximately $1,050,000 and the City would be required to pay the remaining cost, <br />approximately $475,000. These costs are based on the most cost effective wall <br />construction. <br />Mn/DOT appreciates the City of Arden Hills commitment to reduce congestion on I-694, <br />TH 96 and the local roadway system within the City of Arden Hills. The improvements <br />shown on the layout will allow for the traffic in this region to experience improved travel as <br />well as prepare for a future expansion of mainline I-694 to the east. If you have any <br />additional questions or if you need any further explanation of these issues ahead of the <br />public hearing on August 9, 2010, please feel free to contact me. <br />Sincerely, <br />Mark J. Lindeberg <br />North Area Engineer <br />cc: Wayne Norris <br />Ar� �q�a� �ppo�unit� ���loy�� <br />