Sandia National Laboratories, California (SNL/CA) is a government-owned/ contractor-operated laboratory. Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, manages and operates the laboratory for the Department of Energys National Nuclear Security Administration (NNSA). The NNSA Sandia Field Office administersthe contract and oversees contractor operations at the site. This Site Environmental Report for 2013 was prepared in accordance with DOE Order 231.1B, Environment, Safety and Health Reporting (DOE 2011d). The reportprovides a summary of environmental monitoring information and compliance activities that occurred at SNL/CA during calendar year 2013.General site and environmental program information is also included.