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LLNL Emergency Management Plan(EPlan) Rev 26 January 2021 The Carnegie-Corral Hollow Fault system passes through Site 300 and 3 km east of Site 200. Field investigations by LLNL Geosciences in 1991 suggested that the Carnegie-Corral Hollow Fault should be considered potentially active, in which case it makes significant contributions to the hazard at both sites. Apparently, less active and/or shorter faults that make lesser contributions to the overall hazard include the Las Positas and Verona-Williams faults, and the recently discovered Mount Diablo thrust fault under the Livermore and Sycamore valleys. Historical records indicate that about once every 20 years Site 200 is subject to an earthquake that can at least knock books off shelves, overturn furniture, cause lighting fixtures to fall, and the like. No active faults are known to underlie Site 200, and there is no historical record of surface rupturing or faulting at the site. Flooding resulting from seismic events would not occur at LLNL from a failure of the Del Valle Reservoir dam, from loss of water from the Patterson Reservoir, or from a break in the South Bay Aqueduct near LLNL. Wildland Fires Wildland fires are a concern at LLNL. Historically, wildland fires have not been a threat at Site 200. However, wildland fires are a significant concern at Site 300. Precautions are taken to reduce the potential for a wildland fire spreading at Site 300 by reducing/controlling the growth of vegetation within a buffer area inside the perimeter fence. Wildland fire control at Site 300 is also mitigated aggressively by the annual prescribed burn. The prescribed burn confines a potential fire to the property boundaries of Site 300, eliminates the fuel in high fire probability areas (high explosive test areas), and generally breaks the fuel path, thereby limiting the size of potential fires in other areas. The Fire Department has been successfully conducting prescribed burns at Site 300 for over 45 years. Three documents describe and regulate the prescribed burns, the Prescribed Burning/Smoke Management Plan,Site 300 Explosive Test Facility Prescribed Burn/Smoke Management Plan and EMD Procedure 1606, Tactical Plan - Command Procedures: Controlled Burns at Site 300.Because of the prescribed burn process, firefighters assigned to ACFD Station 21 at Site 300 are well trained and experienced with"back-fire" techniques and use that technique extensively as a fire control measure when responding to wildland fires at Site 300. Staffing at ACFD Station 21 allows a standard two-flank attack. LLNL firefighters have a history of aggressive wildland fire attack at Site 300. Wildland fires beyond the capabilities of this initial fire attack are usually held in check by the prescribed burn boundaries; however, due to the topography and remote nature of Site 300, additional ACFD equipment and personnel are automatically dispatched by Alameda County Regional Emergency Communications Center (ACRECC) as part of LLNL's planned initial response to a wildland fire at Site 300. Through LLNL's Mutual Threat Zone Memorandum of Understanding (MOU)with California Division of Forestry and Fire Protection(CAL FIRE), this may include specialized resources such as firefighting helicopters and fixed-wing aircraft tankers. 20