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ARDEN HILLS CITY COUNCIL—October 12, 2049 11 7A. Presentation on Brimknoll Neighborhood Highway Noise Study (continued) Mr. Chromy stated that each receptor covers three to five homes that would receive the benefit from noise mitigation. This would be nine to eleven homes that would receive a five decibel or more benefit from the twenty foot noise wall. The remaining homes in the area would receive a benefit of less than five decibels. Councilmember Holden asked how long the wall would be if it were shortened. Mr. Chromy stated that it would be approximately 1700 feet long. Councilmember Holden asked what the reduction in noise would be if the wall were only 10 feet high. Mr. Chromy stated that this would achieve about 75% of the noise reduction of a 20 foot wall and there would be no change in the noise at the R15 and R16 receptors. Councilmember Holden asked if all the gees would be removed if a berm were built. Mr. Chromy stated that all the trees in the grading area would be removed. They would possibly replant some of these or plant new trees in this area as part of the project. He stated that he had received three e-mail responses to the berm from residents of the neighborhood. These responses were: one in favor but wants to know the cost and effectiveness, one opposed to the use of City funds, and one in favor but wanted more done in the area between the berm and the noise wall. Councilmember Holmes stated that construction crews generally get the dirt that is - hauled away in highway projects. She asked if Bolton & Menk had talked with Ramsey County about having the dirt hauled to a site within the City to help build a berm. Mr. Chromy stated that they had talked with the County in general terms. There is no contract for this project it could be written in that "X" amount of materials are to be dumped at this site. Jim Tolaas has stated that he would be willing to have this done at no cost to the City. Councilmember Holden stated that a dirt berm at receptor R15 would benefit about 4-6 residents. She asked if the residents across the street in Colleen Circle would get a benefit from the berm.