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ARDEN HILLS SPECIAL CITY COUNCIL WORK SESSION — JUNE 23, 2025 4 Mayor Pro Tem Monson clarified if the wall will be the same height all along. Baxter said the height of the wall does start to fall away, but not as rapidly as the ground does. Councilmember Weber asked about the top of the wall at the northern most section. He asked how that compares to the roof line. If it's 8 feet tall and the building height is way higher than that, this may not be impactful. He stated that they are already meeting the noise standards, he is just curious if this wall will impact the noise coming from the rooftop equipment. Baxter believes the wall is taller than the roof, but not by a lot. The topography falls off as it goes toward the homes. So the wall will essentially sit up on a hill. Councilmember Weber said when they come back with this, he would like to know how the entire profile of the wall aligns visually to the neighboring properties. Larson said the line of sight to the neighbors is the wall. It may not be as tall as the building but the wall interrupts the line of sight. Councilmember Holden said the noise complaints haven't been regarding the rooftop equipment. She asked what the difference is between the shades of green on the graphic he showed. Baxter said there is about 5 decibels difference between the light and dark green. Discussion regarding the different colors and shading on the graphic and he showed how that is effected by the height of the wall at different spots. Mayor Pro Tem Monson asked if there are different vibrations between the low sounds and the high sounds. She asked if the wall will block those vibrational frequencies. Baxter said these walls are more effective at higher frequencies. There will be a significant reduction of the higher frequency noises. Councilmember Weber said the beeping that generates most of the noise complaints should be the most impacted by this wall. Baxter outlined on the graphic how that beeping was reduced with the installation of this wall. They believe there will be at least a 15 decibels reduction. He explained a 5-8 decibel reduction is significantly quieter. A 10 decibel reduction is about half of what it was. The presenters stood for questions. Mayor Pro Tem Monson said that by eliminating the high frequency noises, it may draw attention to the low frequency sounds. She suggested that they be thinking of that as they move forward. Larson understands her point. He said people are more tolerant of low frequency sounds. You can't hear them as well.