2B, MnDOT I694 TH 51 Improvement Project Update

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Terry Maurer From: Lindeberg, Mark (DOT) [Mark.Lindeberg@state.mn.us] _ Sent: Monday, November 22, 2010 3:44 PM To: Terry Maurer Cc: Norris, Wayne (DOT); Patrick Klaers Subject: FW: 694 Noise Wall Terry - I just wanted to convey a bit more information regarding this wall. As far as the cost split of the wall goes, the City can either pay as a lump sum for the wall,which the cost to the City would be$475,000. This cost includes all design costs and construction costs. Or, Mn/DOT would go with a schedule I breakdown of the wall. The City would then be responsible for whatever the costs are above and beyond the$3250 per decibel per benefiting resident. This option has much more uncertainty to the city than does the lump sum option. Also, during the NAC process,the location of the proposed noise wall was established to obtain the best noise reduction possible. This location was determined to be just off the R/W line (we need it to be 10' off the line for repair purposes). This alignment does dramatically impact trees in the area. From our preliminary look, approximately 2000' of wall construction will impact trees. Some of these areas are Oak trees and others are very dense areas of trees. The total length of the noise wall is 3000', so the impacts will be quite large. Also,trees will need to be removed to allow us the ability to construct the wall, at least 10' on the roadway side of the wall. I am conveying this information as there will be a dramatic change to the look of the area that the local residents may not be prepared for or expecting. This is a detail that was not really ever discussed as apart of the NAC process. Mn/DOT will do its best to minimize these impacts through construction, but this is the information that is available to us at this time. Please let me know if you have any questions regarding this information. Thanks Mark From: Lindeberg, Mark (DOT) ' ....M....µ_�_ Sent:Thursday, November 18, 2010 12:39 PM To: 'terry.maurer@ci.arden-hills.mn.us' Cc: 'Patrick.klaers@ci.arden-hil Is.mn.us; Norris, Wayne (DOT) Subject: 694 Noise Wall Terry I am writing you regarding potential noise wall construction as a part of the 1-694 project. As a part of the Noise Advisory Committee (NAC), Mn/DOT analyzed the noise walls for the entire project. While some walls were determined to be reasonable (reduce the noise by a minimum of 5dBA), no walls were determined to be cost effective. In conversations with the city, I was made aware of Arden Hills possible desire to include the construction of a 20' high noise barrier along the north side of the west bound C/D road. 1n letters to the City of Arden Hills dated August 5, 2010 and September 14, 2010, Mn/DOT stated that the total cost of this wall is approximately$1,525,000. Mn/DOT is willing to participate up to$3250 per decibel per benefiting property. This means that the City could request that Mn/DOT construct this wall. In doing so, Mn/DOT would contribute approximately$1,050,000 and the City would be required to pay the remaining cost, approximately$475,000. These costs are based on the most cost effective wall construction. Mn/DOT is proceeding with the roadway design for this project, and due to the tight schedule we are following, Mn/DOT kindly requests that Arden Hills consider this noise wall issue in a timely manner. And, if Arden Hills could provide i