LLNL) is a premier, US Department of Energy, applied-science, national security laboratory, whose primary mission is to ensure that the nation's nuclear weapons remain safe, secure, and reliable and to prevent the spread and use of nuclear weapons worldwide. This mission enables our programs in advanced defense technologies, energy, environment, biosciences, and basic science to apply LLNL's unique capabilities, and to enhance the competencies needed for our national security mission. The Laboratory serves as a resource to the US government and as a partner with industry, academia, and international communities.With local, state, and federal interests, LLNL is committed to providing responsible stewardship of the environmental resources in our care. LLNL has developed a rigorous radiological monitoring program that will be summarized in this paper. LLNL SettingLLNL operates two sites: the Livermore main site (or Site 200) and a nearby experimental test site (Site 300) (Figure 1). The Livermore main site is approximately 260 ha located near the San Francisco Bay in Northern California, and is situated in the town of Livermore, which has a population of 74,000. There are residential neighborhoods within 100 m of the main site, and more than 45% of LLNL employees live in the Livermore Valley. Site 300 is a remote testing facility in the hills 24 kilometers east of the main site. Radiological monitoring activities are conducted at each site.

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NESHAPs limits the emission of radionuclides to the ambient air from DOE facilities to levels resulting in an annual effective dose equivalent (EDE) of 10 mrem (100 µSv) to any member of the public. The EDEs for the Lawrence Livermore National Laboratory (LLNL) site-wide maximally exposed members of the public from operations in 2003 are summarized here.

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