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ESPR 2022 SCOPE The Hanscom Field Advisory Commission,including representatives from the towns of Bedford, Concord, Lexington, Lincoln, the South Lexington Residents Association and the Aircraft Owners and Pilots Association met on November 16,2022 and unanimously voted to request for the items described below to be included in the scope of the 2022 Hanscom Field FSPR. We appreciate the opportunity to participate in the ESPR development process and hope to see action on these requested items. Sincerely, Christopher Eliot,Ph.D. Hanscom Field Advisory Commission, Chair Thursday November 17, 2022 1. To our knowledge, there has never been a study of airport soil samples for lead contamination. After 60 years flying piston aircraft over the airfield on leaded AvGas there is presumably a significant level of lead contamination on or in the vicinity of the airfield. The 2022 ESPR should include a study of airfield soil and possibly air and water samples collected and analyzed for lead. Communities adjacent to Hanscom Field are particularly concerned about high levels of lead contamination in the soil because construction projects periodically haul soil from the airport through our communities and we need to determine our appropriate level of concern about lead contamination resulting from this activity. 2. The FAA has recently approved an unleaded replacement for 100 LL for aviation use but it will take some years before this is available at Hanscom Field. We would like to see a detailed sequence of verifiable milestones culminating in the rollout of unleaded AvGas at Hanscom Field.We would like to be able to use this sequence as a checklist so we can measure progress along the implementation plan, and have awareness of where in the process there is an obstacle. 3. There has been a lot of discussion of alternate fuels for aircraft including electric,hydrogen, SAF all of which promise to reduce local emissions and may reduce noise levels. As citizens we are trying to make sense of various conflicting and confusing commercial claims and promotional statements. It would be very useful to have a properly researched discussion of these potential environmentally friendly future technologies including best estimates of expected deployments and likely beneficial impacts. According to published claims, some of these technologies could be deployed in the five year period covered by the 2022 ESPR so this discussion is timely. 4. Massport has been a leader in environmentally friendly construction and several recent projects have included solar power production. What is the projected future of solar power production at Hanscom Field? In future years,what percentage of airport electrical usage is expected to be produced on-site without carbon emissions? Can a table or chart show likely projections? 5. Does Massport have a plan to make Hanscom Field a net-zero carbon emitter by a specific date? Can the ESPR 2022 include a table showing milestones along the path to achieving net zero carbon emissions from Hanscom Field. For practical reasons,it is probably best to separate aircraft emissions,which are less under Massport control, from buildings and operations,which are more under Massport control. (See https:// www.massport.com/massport/media/newsroom/massport-announces-goal-to-be-net-zero-by-203 I/) 6. Determination of Hanscom Field air quality impact is almost entirely based on modeling. There have been many requests for actual measurement to be done. 7. The Shawsheen river flows through Hanscom field and has potential use for drinking water. Municipal water supplies for Bedford, Concord, Lexington and Lincoln are located between 0.9 and 6.8 miles from Hanscom Field(2017 ESPR P.9-30) and could be affected by salt, de-icing compounds or other chemicals used on the airport.We request ongoing and active testing of water flowing from the airport to increase confidence in the safety of our water supplies.