To satisfy the requirements of the United States Department of Energy Order 231.1, "Environment, Safety and Health Reporting", the Environment, Safety, and Health Division of the SLAC National Accelerator Laboratory prepares an annual report describing its environmental programs and activities. This Annual Site Environmental Report: 2009 summarizes the SLAC National Accelerator Laboratory compliance with standards and requirements, describes the management and monitoring systems in place, and highlights significant accomplishments for the year. Organization The report is published in a single volume, organized into the following chapters:  Chapter 1, "Site Overview", describes the environmental setting of the SLAC National Accelerator Laboratory and the activities conducted at the site  Chapter 2, "Environmental Compliance", gives an account of the regulatory framework and results concerning the site's environmental programs  Chapter 3, "Management Systems", outlines the organizational structure, methods, and responsibilities relevant to environmental programs  Chapters 4, 5, and 6, respectively "Environmental Non-radiological Programs", "Environmental Radiological Programs", and "Groundwater Protection and Environmental Restoration", give more detailed accounts of the programs and their results for the year An executive summary provides an overview of the report.