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I-2.2 EWSF DESCRIPTION I-2.2.1 General Description The EWSF is used to store explosives wastes and small quantities of primary explosives, such as waste detonators, squibs, blasting caps, and other initiators. The location of the EWSF (shown in Figure 144) is in the Process Area on a ridge in the southeast portion of Site 300 in San Joaquin County. Ground surface elevations range from approximately 930 to 960 ft, and the terrain slopes steeply toward the west and east. I-2.2.2 Physical Description The EWSF consists of two earth -covered, concrete magazines; two earth -covered, corrugated- metal magazines; and one prefabricated metal building (Magazine 816 [M816]). The magazines are built in asemi-circle in a knoll with their doors facing out from the knoll. The materials and methods of construction are designed to minimize sympathetic fires and explosions by maintaining a fairly consistent temperature and humidity within each structure. Compliance with explosive weight and distance limits also help to ensure the safe operation of the EWSF. The magazines and M816 are designed to manage storm water run-on by preventing precipitation from entering the structures. Magazines 3 and 4 have canopies over the doorways and concrete ramps sloping down from the entrances to drain run-off away from the unit. Magazines 2 and 5 have canopies of corrugated metal over their entrances to keep precipitation away from the entry. M816 is equipped with galvanized steel gutters and downspouts to facilitate drainage away from the building. Access to the EWSF area is secured by an 8 -ft -high security/safety fence and the Process Area Control Post. The layout of the EWSF is shown in Figure I-2-2. Additional details for the EWSF design, construction, and operations are provided in Sections IV and VI of the EWSF Operations Plan. I-2.2.3 Description of the Waste Handled Lawrence Livermore National Laboratory (LLNL) operations include the research and development of explosives materials. Explosives wastes are generated only from LLNL weapons programs research and support operations located at the Livermore Site and Site 300. The waste generator identifies and characterizes the wastes at the point of generation. Explosives wastes are well characterized but vary over time. Table I-2-1 lists the explosive waste forms that may be stored in the EWSF. LLNL Site 300 Contingency Plan 1-2-4 January 2019 Appendix 1-2, EWSF