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HomeMy WebLinkAbout2025-03-27-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: 3-27-25 Meeting was held hybrid via Zoom Members Present: Jon Himmel, Celis Brisbin, Lisa Giersbach, Wendy Krum, Charles Favazzo, Henrietta Mei, Fred Merrill Others Present: Mark Barrett, Michael Burton, Mark Sandeen, Brian Black (SMMA), Mike Cronin, Martine Dion (SMMA), Anthony Jimenez (SMMA), Lorraine Finnegan (SMMA), Cindy Arens, Jamie Meiser (Turner), Mike Dowhan (SMMA), John Shankle, Andy Oldeman, Paul Elliot The PBC meeting was called to order at 6:05 pm. Turner's Construction's Estimating and Involvement: Jaimie Meiser provided an update on the work that was done with SMMA, the Town of Lexington, and Dore and Whittier. Turner Estimating did a full PSR estimate for the project. Logistical and schedule verification for geothermal and building duration were done. Estimates were also provided for mass timber, four different HVAC options, different geothermal options, central offices, seven options for the field house, three different plumbing options, electrical temp service planning, community submissions, and door/hardware/security options. There was also guidance provided on steel compared to concrete options. Jon Himmel commented that it was helpful to hear everything that was being done. He reported that he took a list of the task chart to figure out what was represented by it. He stated it would be helpful to have a conversation about things that should be done in April or May to help the process. It was asked if there was any guidance that came out of the update. Jaime Meiser stated that there were no big surprises and discussed that it was the process that was important. It was asked if there was an acid waste solution in the building. Lorraine Finnegan reported that there was, and it was a chip tank. Lexington High School Project—Introduce, Discuss, Confirm: Introduce/Discuss: Bicycle Parking Mike Dowhan reported that they were looking to incorporate 10-foot wide shared-use paths throughout the site to accommodate bicycle infrastructure. Bike racks would be located strategically at entrances and the fields. There were 140-150 bicycles currently on campus, and the recommendation was 155 based on 5% of the entire school population. The pedestrian and bicycle master plan included opinions on e-bicycles and e-scooters. Parking would be provided but not charging. Athletic Field Material Natural versus synthetic turf was discussed. Natural sod was what was priced and what was asked to proceed with. Bleacher Systems The PSR carried the same alumni structure with 1,000 seats. There were opportunities to accommodate different options, such as terrace seating, but the proper amount of space would be needed. Fencing Types/Heights A four-foot high vinyl-coated chain-link fence was proposed to enclose the football field. For the relocated diamond fields, there would be extensions of fencing along the left and right-field lines. Safety netting would potentially be placed along the east side of field C1, where it ran parallel to the building and egress, as well as alongside the entire length of Worthen, where the two diamond fields were relocated. There would also potentially be safety netting behind the football field posts. Lisa Giersbach asked if the bike parking would be stands or also protected. Jaimie Meiser stated that there would be both, but they had yet to identify areas where they would go. Lisa Giersbach asked if LEED required interior bike storage. Lorraine Finnegan reported that it did not. John Shankle, representing the Lexington Bicycle Advisory Committee, commented that the closer the bike parking could be made to the building, the better the incentive for individuals to ride their bikes. He agreed on the necessary count for parking for bikes, but he stated they would like to see more parking for increased biking. He suggested using inverted U-racks, which had two points of contact. John Shankle stated that he believed interior bike parking would be appropriate for staff. He commented that the shared-use path on Worthen Road would only be on the east side. He asked if the Bicycle Advisory Committee could be given a heads-up before future meetings so they could attend. Cindy Arens suggested updating it that sod requiring a minimum of two to three weeks for root establishment was a con. She also noted one con of the synthetic turn was potential exposure to toxins and microplastics. She discussed the long-term effectiveness of each field material. Chuck Favazzo recommended extending the safety net behind home plate and on the first and third-base lines for C1. Celis Brisbin asked what percentage of current students were using bikes. It was reported that it was approximately 6%. He asked why the target was only 5%. It was clarified that the target was 5% of both staff and students. Celis Brisbin raised concerns about having adequate bike parking for the future. Lorraine Finnegan reported that they would review the bike parking numbers and present them at a future meeting. Generator Load List &Size Anthony Jimenez presented the resilience levels. It was previously agreed that the gymnasium and field house would be at level two for a town shelter, and the rest of the building would be at level three. He reviewed the resilience loads and proposed backup power sources. Level 2 included providing power to critical life safety systems, building freeze protection, fridges and freezers, the field house, the gymnasium, two classrooms adjacent to the fieldhouse and gym, and the locker rooms. Level 3 would include power provided for essential operations with reduced lights, flush valves and sinks in the restrooms, building and admin support, and instructional and specialized rooms. The kitchen, fieldhouse gym, and auditorium plug load and tech would be fully powered down at Level 3. A roll-up generator would be available for hot water and the kitchen if needed. Jon Himmel asked about the space in the fieldhouse. The fieldhouse in the round would have openings to other spaces. Lorraine Finnegan reported that it was 48,000 square feet. Anthony Jimenez clarified that the 2000 kW/8000 kWH battery and the 3500 kWH solar system were provided for the building to meet energy goals, but it also provided an opportunity to use it for the resilient option. The battery's main priority was energy savings. The generator would come into play if the battery was depleted. Jon Himmel asked to see what a January outage would look like at a future meeting. Mike Burton asked if two 4,500 kWH generators could be looked at. Anthony Jimenez stated that they could look more into it, but it could create issues with space. Mark Sandeen commented that they could think about the battery independent from the solar. He asked how many outages at the high school there had been. Mike Cronin reported that there were three outages at the high school over the past two years, and they lasted a short period of time. Mark Sandeen discussed that they likely would not need to cover the school for a long period of time. He explained that the battery would be full from being charged from the grid. Mark Sandeen clarified that they would not need to send students home during outages. Anthony Jimenez reported that the new connected load for the building was at 7,000. Even with aggressive diversity, it was likely that Eversource would need to make a capital investment. Their estimate was $18 million, and it would be entered into a share-modeled cost. The school would only pay for what it needed. The impact on the costs was not yet fully understood. Mark Sandeen commented that Eversource said the cost was $18 million, plus or minus 25%. He raised a concern about the schedule risk of the project. The maximum available was 2,500 kW without pulling $18 million of lines. Mark Sandeen stated that he believed they should work to show that the load was below 2,500 kW. Lorraine Finnegan stated that they needed to submit a load letter and start the conversations with Eversource. Cindy Arens asked when the total connected load calculation could be shared. Anthony Jimenez reported that he could share it after the HVAC was decided. Cindy Arens asked what electrical systems drove the total connected load system so high. Anthony Jimenez stated that the biggest driver included the HVAC. Classroom Lighting There would be two simple light switches by the door. Three different options for lighting code solutions were available, and option one was recommended. The goals for the lights were to support flexible and evolving classrooms, leveraging cutting-edge and maintainable technology, enhance the visual environment for learning, circadian-supportive lighting, and meet and exceed energy code standards. There were three lighting options, all of which were recessed lighting. Bldg &Site Lighting The goals for lighting were to have efficient LED technology, full cutoff optics and glare control, Dark Sky and LEED compliance, and 20 to 25-foot poles. Discuss: Lighting Control Preferences Discuss/Confirm: HVAC basis of Design Martine Dion presented the four HVAC system options. All four systems had incremental savings. The cost of the system, as well as associated costs, were included in the estimations. The air-source heat pump was less efficient and was an associated cost that was accounted for. There were higher incentives for ground-source heat pumps compared to air-source. The IRA incentives were separated due to the potential risk that they would not be available. The estimated 75-year LCCA costs were factored into the life cycle cost analysis. The replacement cost of the VRF was still being examined, and the cost currently included the replacement of it every 15 years. Once the building was occupied, there would be additional financial benefits and revenues, which would apply to all options. When examining the estimated incremental costs, they all were associated with zero- year payback. The ground-source HP provided more savings than the air-source because it was more efficient. It has been commented that the life cycle cost analysis should be done in an integrative way. The assumption was that electricity was being bought for the grid, but there would also be energy generated by the school. It was noted that the VRF system would also increase the price of solar. Martine Dion noted the use of the grid post-construction was evaluated so they could look into that in terms of what it meant in reducing the payback. It was acknowledged that the VRF systems were often more expensive. Andy Oldeman discussed that they had more issues upfront and a slightly shorter lifespan. Mark Barrett noted that they also found that they leaked more frequently. Cindy Arens noted potentially getting low, medium, and high scenarios and integrating all systems to determine what would be paid for electricity. She asked about geothermal providing domestic hot water and how that would integrate. She asked if there was a spreadsheet that could be shared. Martine Dion stated that she could share the spreadsheet and include the energy model information. Cindy Arens asked what the process of narrowing the options down was. It was explained that the PBC would discuss on the 10th, and the SBC would discuss on the 14th. It was decided to vote during the PBC meeting and provide a recommendation to the SBC. Jon Himmel asked when Mass Savings versus IRA savings would be solidified. Martine Dion stated that she would add that information to the table. Elec Water Htrs vs Heat Pumps Paul Elliot presented the hot water options. The domestic hot water options included an air source heat pump, water source heat pump, solar thermal, electric storage, and an LCCA for each system. Martine Dion presented the life cycle cost analysis that compared the domestic hot water systems and the incremental costs and paybacks for the options. Martine Dion noted that she would like to understand the annual maintenance costs of the existing solar hot water systems so that they could compare feedback. Mark Barrett stated that they had a three-month pool system that they could look at. He stated he was not excited about a solar hot water system. Cindy Arens asked why the air source heat pump was bolded. Martine Dion reported that it was within the PSR cost. Cindy Arens asked if the air source heat pump was a split system. Andy Oldeman reported that it was an outdoor rooftop system that would have connections inside. Cindy Arens asked about any rebates for heat pump hot water systems. Martine Dion stated that they had not expanded the rebates from residential to commercial. Andy Oldeman noted that the heat pump options for domestic hot water were relatively new to the market. Cindy Arens asked what load the systems were designed for. Martine Dion stated that she could provide the memo with the information. Confirm: Floor to Floor&Ceiling Heights Brian Black presented an update on floor-to-floor and ceiling heights. The recommendation was to proceed with the current assumption of 16 feet floor-to-floor and look for reductions in the future. Brian Black discussed that they did not want to overpromise and believed 16 feet was the best way to go for the current time. Charles Favazzo suggested starting at 14 feet. Brian Black stated that some ceilings would need to be 10 feet or nine feet in some cases, which was one of the factors. Lorraine Finnegan noted that a foot would also be lost due to the roof slope. Jon Himmel asked what the liability of waiting to select one of the HVAC options was. Lorraine Finnegan stated that they could wait two weeks until the HVAC option was selected. Jon Himmel noted that they had a meeting in the following week to discuss any items that were not included in the decision matrix. Brian Black discussed that there was always some uncertainty, but they would continue to look at the floor-to- floor and ceiling heights. Jon Himmel asked if it was possible to decouple the underside of the ceiling and the underside of the structure for the purpose of the design. Lorraine Finnegan stated that they would look further at the heights. She noted that they wanted to ensure there were safeguards in place so they did not have to increase ceiling heights in the future. Lightning Protection System vs Prevention Anthony Jimenez reported that there were two options for lightning protection and prevention systems, both of which were compliant with the NFPA 780 Standard. The prevention system was recommended due to being less cost and PV-friendly. It was confirmed that there were no insurance requirements. Celis Brisbin asked if just the PV system could be used. It was confirmed that both systems were needed. Everyone agreed to move forward with the prevention system. Public Comment There was no public comment. Summary of any action items The slide on natural turn versus synthetic turf will be updated to adjust the pros and cons. SMMA will review the bike parking numbers and present them at a future meeting. SMMA will provide an outlook on what a January outage would look like in terms of generator load size. SMMA will look into having two 4,500 kWH generators instead of one 9,000 kWH generator. The tiered standby/resilience loads table will be modified so that Level 2, 3, and 4 rows are merged to show that the backup power sources are the same. The list of chemicals held at the school will be examined. The draft calculation for the total connected load will be sent to Cindy Arens. SMMA will look into doing the life cycle cost analysis in an integrative way. Martine Dion will share the spreadsheet regarding the HVAC options with Cindy Arens. SMMA will add information about the timing of Mass Savings versus IRA savings to the table about the HVAC options. SMMA will send the memo about the loads the hot water systems were designed for to Cindy Arens. SMMA will send the PowerPoint ahead of time for the PBC to review prior to the next meeting. Urgent Business There was no further business. Motion to adjourn PBC, all approved.