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HomeMy WebLinkAbout2025-03-13-PBC-min 0°57S �77s TOWN OF LEXINGTON oma` �� D Permanent Building Committee aim oW � a^ Permanent Members <FAPRIL 9' Jon Himmel Co-Chairman Charles Favazzo Co-Chairman XINGSO Peter Johnson, Cells Brisbin, Elizabeth Giersbach, Frederick Merrill,Ian Adamson Associate Members: Wendy Krum, Henrietta Mei PBC Minutes for the meeting held on: 3-13-25 Meeting was held hybrid via Zoom Members Present: Jon Himmel, Celis Brisbin, Elizabeth Giersbach, Wendy Krum, Henrietta Mei, Charles Favazzo, Peter Johnson, Fred Merrill, Ian Adamson Others Present: Mark Sandeen, Dan Voss, Lin Jensen, Andy Joynt, Kavitha Venkatesan, Kathleen Lenihan, Cindy Arens, Todd Rhodes, Maggie Peard, Mike Cronin, Mark Barrett SMMA: Brian Black, Sarah Sopelak, Martine Dion, Anthony Jimenez, Anoush Krafian D&V11: Michael Burton Jacob Greco, Christina Dell Angelo, John Albright Turner: Phil Coleman, Jamie Meiser The PBC and SLC Meetings were called to order at 6:00 p.m. Lexington High School Project—Introduce, Discuss, Confirm Exterior Design (Introduce) Brian Black presented aerial and eye-level views of the design. Finish Materials (Introduce) Brian Black stated that the schedule had the topic confirmed on April 10, which would confirm the scope of the enclosure. A summary of the materials was presented, which included opaque masonry walls, rainscreen elements, and windows and curtain walls. There was a 25%window-to-wall ratio in the existing format. There was a large increase in cost and availability from brick to any other materials. The embodied carbon factor was being evaluated in the materials. The next step of the design process would be to evaluate where the materials would be sourced from, how they were transported, the energy used to install them, and their end-of-life sequence. Terra cotta had a high embodied carbon factor. The amount of brick may be increased due to cost, but embodied carbon needed to be examined as well. The pre-finished metal panel was used a lot in accent areas and could be used metallics to present a more elevated finish. There were a series of other rainscreen possibilities, and they would continue to be examined. There were three elevation "types" discussed, including the sides of the classroom wings, the short ends of the wings, and the entrances. The fenestration approach is important to ensure reliable daylight. Several exterior design drawings were presented. Feature Space Design (Introduce) Renderings of the spaces and the exterior were presented. In the plan, there were a few feature spaces, including the dining commons on level one. On the upper levels, the quad had a double-story area. Classes were being built off the bridges as well. There would likely be elements of wood and a tuning of the space for great acoustics in the auditorium. In the gym, there was clear glazing up high and windows to allow light in. The Fieldhouse renovation would include new flooring and a new track. The second floor had a library/media center with a reading room with a double-high space. On level three, there would be a large group instruction space. Level four contained more classrooms and the central office. Sarah Sopelak discussed the interior design. She noted the priority for healthy materials, which included durability and performance, aesthetics, red list free, and cost-effectiveness of the material. A large database of the materials has been created. The flooring, walls, and ceiling finishes were being examined. For the floors, concrete and linoleum were compared based on red list chemicals, durability, material cost, acoustic impact, and glare. Sarah Sopelak reviewed the options that were being examined for classroom and ceiling finishes and floor finishes. Jon Himmel discussed the integrated design policy and stated that there was some intent to have more active discussions about it. He discussed engaging someone to come up with comparative quantifications, to include systems such as structure and foundations, public spaces and VE targets. Wendy Krum agreed that it was important to receive feedback simultaneously during the design process. She discussed that there was not much opportunity to discuss design issues which may not have come up during presentations and recommended having a meeting to focus on more discussion. It was suggested to come up with a list to discuss and hold a meeting with the design team. It was asked if Turner was giving continuous feedback, and it confirmed that they were. Life Cycle Cost Analysis for HVAC Options (Introduce Martine Dion reported that there would be early results of the 75-year LCCA in a couple of weeks. The LCCA included installation costs, replacement costs, and maintenance costs. The construction and occupancy incentives continue to be tracked. The LCCA was being conducted on the four HVAC systems presented a few weeks prior. The design of the systems was moving along, and the HVAC system had additional impacts on the solar and roof designs. The four HVAC systems' impact on the roofscape and ongoing site design were being examined. Martine Dion stated that the numbers with and without IRA would be presented. It was suggested to model without the IRA's requirements as well because it would save money if only 33% of wells were drilled compared to 51%. Martine Dion noticed that the hybrid system was not as efficient as the ground-source heat pump, and they were examining the impacts. It was discussed that electrical backup should be minimized due to the cost. PV Size & Battery Storage Size (Introduce/Discuss Anthony Jimenez reported that they were proposing to increase the battery from 2000 kW to an 8000-kWh battery due to the three-hour discharge requirement and the increasing understanding of the building's resiliency. It was not anticipated to increase any further. The 3500 kW-dc PV system was still believed to be the appropriate size. The canopy parking arrays would be used to return to the net-zero building target. It was asked when the analysis of the rooftop array and canopy would be available. It was reported that the goal was to have it completed and circulated during the week of March 17. It was asked when the solar PV system size would be updated due to the changes to the fieldhouse plan and how it would be incorporated. It was stated that the fieldhouse would increase the energy usage, but there was a contingency plan in place. Although the energy need was higher, 3500 kW would still meet the goals. It would be reexamined after the model was finalized. Schools in the past used more energy, so the energy usage needed to be examined while keeping in mind the changes. Lin Jensen asked if involving part of the existing school would be discussed. Martine Dion stated that they would look at it and discuss it at a future meeting. Lin Jensen stated that she hoped they were doing all they could to maximize the solar coverage. If there was excess space through the walkway, she encouraged adding as many solar panels as possible. She discussed trying to have a net positive. Martine Dion stated that the current directive was a net zero building, and there would be a discussion about contingency in the net zero. Lin Jensen asked if they could examine the cost of adding additional solar panels. It was decided to circle back and return with an answer. Floor to Floor & Ceiling Heights (Discuss) The impact of floor-to-floor heights on total building height was discussed. A rendering of the eye-level view was presented. The mechanical system had not yet been selected, which had many impacts. The Level 1 survey elevation had not been finalized, which also had an impact on the overall building height. Based on the directive received, they were moving forward with 16 feet but looking for opportunities to change as needed. It was asked if round skylights were examined as an option and if there was a shading system for the skylights. Brian Black stated that they had not spent a lot of time on skylights yet due to being in the early stages of schematic design. It was commented that all exteriors were in neutral colors, and it was asked if other colors were being examined. Brian Black stated that a wide array of colors was available and that there would be a discussion. Henrietta Mei stated that a circular skylight would be nice as a centralized skylight. It was asked if the windows in the curved section were straight. Brian Black confirmed that they were all straight. Low Carbon Gypsum Wall Board &Tectum Panels (Introduce/Discuss Sarah Sopelak reported that they recommended proceeding with the low-carbon gypsum. Martine Dion noted that there would likely be no major incremental costs. It could be discussed with Turner. Sarah Sopelak stated that tectum wall panels were made of wood fiber and commonly used in gymnasiums for acoustics. It was asked how impact-resistant the tectum was. Sarah Sopelak stated that it was resistant and would also be placed higher. Brain Black noted that there was a high-impact version if it was placed lower. Outdoor Classroom/Roof Terrace (Confirm) Brian Black presented different renderings of outdoor classroom options. He stated that they were hoping to identify locations with the educators, but there had not been a meeting yet. There were opportunities to send boardwalks to different locations. Brian Black stated that they would like to first clarify the scope and locations with the educators prior to confirming any decisions. They will return to the topic at a later date. CO2 Design Level (PPM) (Confirm) The recommended target was 800 ppm. It was asked how the CO2 would be monitored. It was reported that CO2 sensors would be in every area. Commissioning for Demand Response (Confirm): Martine Dion reported that she reached out to two commissioning agents, and the estimate was $10,000 to $15,000. The savings would be beyond $25,000 per year. The PBC confirmed the commissioning for Demand Response. Public Comment There was no public comment. Urgent Business There was no further business. Motion to adjourn both PBC and SLC, all approved. Next meeting will be determined based on availability.