12-03-25 PC Packet - Laserfiche WebLink

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Boston Scientffic Public – Public Release Authorized cottonwood trees as it damages mechanical equipment for residents and spread seeds into nearby yards. caliper size trees surveyed, 28 are cottonwood which is an invasive species. ✓ October 2025: BSC is in planning phase to remove all buckthorn and cottonwood trees within the proposed project area. BSC is aware of the code requirements related to tree preservatfon and will work with the City to meet all requirements. Smoke Shack Concerns regarding proximity of the smoke shack to residentfal yards. BSC is reviewing concerns regarding the proximity of the smoke shack on the North side of Building 14. At this tfme all local ordinances related to the smoke shack have been met; however, the noise barrier project will mitfgate this issue if moved forward. Letter from Residents in 2021 A resident was concerned that BSC either did not respond or that responses are not accurate. ✓ Jeff Hejl, BSC Facilitfes Engineer, responded to this letter in March of 2021 via a letter back to the City. Savannah Doerr reviewed the letter and confirmed all responses are accurate. Second Level of Housing A resident brought up the second level of their home being more sensitfve to noise than ground level. ✓ The current design of the noise barrier wall is taking into consideratfon higher elevatfons in the residentfal community. Extend Wall to East for Extended Dock Noise Coverage A resident brought forth that trucks with backup alarms utflize more of the parking lot to the North-East to back into the Building 14 dock. ✓ A sound study has been conducted to extend the design of the wall east by ~30’-50’ to capture comprehensive dock operatfons noise. Visual & Functfon of Height of Wall SW Leg Questfons about the height of the wall and its aesthetfcs and functfon were brought forth. ✓ The height of the wall has been engineered for maximum functfon at ~21’ tall on the SW leg by the wetland. BSC conducted another study where the tallest portfon of the wall located in a more aesthetfcally pleasing way to allow for more vegetatfon to be kept between the wall and the residents. The best results for sound mitfgatfon will be to keep the SW leg following the trail as originally designed at ~21’. Additfonal Measures – Roof Equipment Upgrades Residents asked about upgrades to equipment on the roof as it has been mentfoned by BSC that infrastructure upgrades are imminent which will help with noise pollutfon. ✓ End-August 2025 – x1 vacuum pump replaced with new in North Mechanical Room where west louver discharges. New vacuum pump is liquid-cooled and thus does not discharge out of west louver. ✓ Labor Day 2025 – x2 21-year-old exhaust fans were replaced with new. The new fans are direct drive instead of belt driven and thus new technology is available to lower noise. ✓ November 2025 – x2 HVAC units will be replaced with new. The new units are fed via hot and chilled water from central systems and thus no loud condenser used on the roof. ✓ November 2025 – Consolidatfng multfple HVAC units into one and thus turning off x3 additfonal 20+ year -old loud units. ✓ November 2025 – x1 23-year-old exhaust fan will be replaced with new. The new fan will be direct drive instead of belt driven and thus new technology is available to lower noise. ✓ December 2025 – Silencers will be placed on the discharge of x3 pieces of rooftop equipment that were identffied as top noise contributors based on current noise profile. ✓ FUTURE – x1 redundant chiller to be placed on roof. Extending screening around new chiller to mitfgate noise pollutfon. ✓ FUTURE – Plans for additfonal, old rooftop equipment replacements underway and built into capital budget planning.