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ARDEN HILLS CITY COUNCIL—October 12, 2009 10 7A. Presentation on Briarknoll Neighborhood Highway Noise Study (continued) abatement consideration criteria. He also provided maps that showed where the noise receptors were located that was used in the modeling for the studies. He covered the lower cost mitigation strategy which included lowering the height of the wall, building a berm, reducing the length of the wall, and combinations of these options. He outlined the next steps that the City could take including working with Mn/DOT as part of the I-694 project, developing a cost sharing agreement, and completing a feasibility study. Councilmember Holden clarified that the Federal noise abatement consideration criteria were used to determine of Federal money could be used for the noise mitigation. Mr. Chromy stated that this was used for both State and Federal trunk highway dollars. Councilmember Holden asked how the noise levels were determined. Mr. Chromy stated that point N3 on the map is a noise receptor. At this particular receptor there were actual readings taken. These readings were used to calibrate the model. There is a set criteria on how the noise measurements are taken and how often they are taken. Mayor Pro Tem Grant clarified that N3 was an objective measurement and the rest of the measurements are computer modeled. He asked why the other measurements are not actual readings as well. Mr. Chromy stated that N3 was an actual measurement and the other points were - computer modeled. This is the process that the State uses when assessing the need for noise mitigation. Councilmember Holden stated that the landscaping at the N3 point is different than the landscaping in the other locations. She asked if this was taken into consideration in the model. Mr. Chromy stated that elevation and landscaping were taken into consideration. Councilmember Hoiden asked how many residents were included in the study that resulted in a cost of$9498 per decibel per residence.