Brookhaven Site Office CX Determinations Determination Date Name of Action: Description Categorical Exclusion Number 1/19/2023 Demolition of Building 129- BHSO- BNL-555 B1.16, B1.17, B1.23, B1.24 4/22/2022 demolish and dispose Building 197 at Brookhaven National Laboratory in Upton New York B1.23 1/25/2022 routine maintenance and minor upgrades to existing Brookhaven National Laboratory facilities. B1.3, B1.4, B1.5, B1.7, B1.11, B1.13, B1.15, B1.16, B1.17, B1.18, B2.1, B2.2, B2.5 6/9/2021 Critical Utilities Rehabilitation Project (CURP) B1.3. B1.5, B1.15, B2.5 6/11/2020 SLAC Trailer Removal Program, T-27, T-294, and T-451 B1.23 4/12/2019 Core Facility Revitalization project B1. 15 4/12/2019 Free Space Quantum Channel device B3.6 9/5/2018 Upton Square Determination B1.15, B1.23, B1.24 10/18/2017 Construct a Cyro-Electron Microscope center adjacent to the National Synchrotron Light Source II facility at Brookhaven National Laboratory in Upton New York | U.S. DOE Office of Science (SC) B3.6 11/2/2016 NEPA Categorical Exclusion: Construction of a Science and User Support Center at BNL B 1.15; B1.23 1 2 3