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I I I Council Meeting Minutes March 8, 1988 In response to Gunderman's concern about an echo, Hanson explained MN/DOT monitored two sites east of 1-694 and both were well below the criteria and, although one could hear a different type of noise, the decibel level would not increase; and Brown indicated the effectiveness of the installation of the wall would be mini- mal. In response to Gunderman's questions, Hanson indicated, although noise would change with wind and temperature, readings are not taken when the wind is over 15 mph nor when the temperature is below 300 or higher than 900; and stated he has studied the rebound effect of noise off the south wall and found the decibel level less. Color of Noise Wall Brandt indicated one of the current colors is very unnatural and the problem is exacerbated by the mixture of colors and suggested one color be selected for the entire length of the wall. Brown stated that Federal monies could be used for 90% of the sandblasting and repainting if the project is city-wide; he would prefer it be done in conjunction with the lane addition project to be completed in 1990; and suggested a few maintainable colors be presented to council for selection of one; estimated the project to cost about $40,000 and suggested the paint's lifetime is 15-20 years. Landscaping Paul Votney, MN/DOT Staff Forester, and Liz Walton, MN/DOT Land- scape Architect, reviewed their plans and slides for landscaping 1-694 through New Brighton. Williams asked about placing a cap on the wall to make the tops level and to make it more attractive. In response to Gunderman's questions, Hanson have been removed in the State and, because of indicated noise over the lakes would be more over grassy areas. indicated no walls absorption factors, intense than noise Votney indicated the proposed Boston Ivy is hearty and would not be affected by the sun on the concrete walls. Rick Wriskey, City Forester, advised council that his two concerns had been rectified by MN/DOT and asked Brown when the landscaping of the non-walled areas would begin; Brown indicated MN/DOT would start in April with transplanting but that a lot of the work in New Brighton would have to fit into the three lane project. In response to Wriskey1s inquiry about vines on the walls, Votney stated the Boston vine will cling, but he will look at adding wir- ing for the other types of vines. Page 17