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ARDEN HILLS CITY COUNCIL – APRIL 26, 2021 15 Mayor Grant requested the applicant address the question that was raised during the public hearing. Jeff Hejl, Facility Engineer at Boston Scientific, explained the existing equipment on the north side of the building, which included an HVAC chilling unit would be replaced in order to reduce noise levels at Building 14. Councilmember Holden requested further clarification on which pieces of equipment would be replaced. Mr. Hejl stated the equipment on Building 14 that was included in the noise study included compressor units and vacuum pumps that have been mitigated since the 2006 study. He indicated there was also a chiller unit on top of the roof that supports the HVAC system, along with air cold units that service the controlled environment in the manufacturing area of the building. He explained the chiller unit on the far north end of the building was past end of life and causes the most noise from the study. He reported this one unit would be removed and replaced. Councilmember Holmes commented this has always been a confusing issue for her. She indicated only the chiller would be removed but it would be replaced with a new chiller. Mr. Hejl stated that was correct. Councilmember Holmes questioned when this would happen. Mr. Hejl explained this would happen during the duration of the expansion project. He stated the project was expected to be done by December of 2022. Councilmember Holden asked if both chillers would be operating at any one time. Mr. Hejl stated this would not occur. Further discussion ensued regarding the future mechanical needs for Boston Scientific. Councilmember Holden requested further information regarding the tree replacement plan. She understood the applicant was interested in planting more trees and reported the area down by the adjacent homes does not have a large number of trees currently. She questioned where the additional trees would be placed. John Larson, RSP Architects, reviewed the tree replacement plan in further detail with the Council. He noted only a portion of the trees that would be planted on the westerly side of the building were shown on the plan. He explained he had submitted an updated landscaping plan (Sheet L161) to staff, but this drawing was not included in the packet. He indicated more trees would be planted to the north along the western edge of the building. Councilmember Holden requested staff changing the drawing on the screen to show where the clusters of trees would be located.