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ARDEN HILLS CITY COUNCIL – APRIL 26, 2021 17 Tony Baxter, Acoustical Engineer with ESI, explained he has discussed what else can be done if this building exceeds the L50 requirement for noise. He reported these changes would not be to the penthouse, but rather would be to the screening around the chiller units. He stated he did not anticipate this building would have a problem. Mr. Hejl commented he has also made mention that post project Boston Scientific would do additional noise readings to ensure the building has met the MPCA limits. He proposed following up with this six months later to ensure the building was meeting the limits. Councilmember Holden questioned what the screen would be made of around the new chiller unit. Mr. Larson reported the screening would be made from a heavy gauge corrugated ribbed metal panel. He stated this material was akin to a sound wall. Councilmember Holden asked if better fencing could be placed around the chiller now. Mr. Larson explained Boston Scientific has been working with Mr. Baxter to find the right material in order to get the desired effect and to reduce sound coming from the building. Mr. Baxter indicated the barrier wall material had sufficient mass that to attenuate the noise. He stated if the material were thicker or stiffer, there would be no improvement. He commented the proposed material was already sufficient. Councilmember Holmes requested Condition 11 be amended to require the applicant to complete a noise study six months after the building was completed to ensure the building was still compliant with MPCA requirements. AMENDMENT: Councilmember Holmes moved and Mayor Grant seconded a motion to amend Condition 11 requiring the applicant to conduct a noise study six months after the building was completed. Councilmember Holden stated these noise studies would be completed when the equipment was most new and efficient. She anticipated the equipment would increase in noise over time and she would like to see Boston Scientific required to conduct more studies over time. Councilmember Holmes discussed Condition 12 noting this would require the applicant to complete an annual noise study. Councilmember Holden indicated this addresses her concern. She called the question. A roll call vote was taken. The amendment carried 3-1 (Councilmember Scott opposed). Councilmember Holmes stated she would like to add Condition 13 requiring the applicant to replace the original chiller by December of 2022.