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Pacific Northwest National Laboratory (PNNL), one of the U.S. Department of Energy (DOE) Office of Science's 10 national laboratories, provides innovative science and technology development in the areas of energy and the environment, fundamental and computational science, and national security. DOE's Pacific Northwest Site Office (PNSO) is responsible for oversight of PNNL at its Campus in Richland, Washington, as well as its facilities in Sequim, Seattle, and North Bonneville, Washington, and Corvallis and Portland, Oregon.This site environmental report provides a synopsis of ongoing environmental management performance and compliance activities conducted during 2012. The report addresses the operations occurring on the PNNL Campus in Richland, Washington, which includes PNNL Site facilities, Battelle Land-Richland (Battelle privately owned land in Richland), Battelle-owned and -leased facilities, and DOE Office of Science-owned land and exclusive-use facilities. Environmental activities at other locations are also included if they are under PNNL's responsibility (e.g., a permitted waste storage and treatment unit on the Hanford Site). The report also includes environmental information regarding the PNNL Marine Sciences Laboratory (MSL) and Battelle Land-Sequim (Battelle privately owned land located near Sequim, Washington). It includes a description of the location and background for each facility; addresses compliance with all applicable DOE, federal, state, and local regulations and sitespecific permits; documents environmental monitoring efforts and status; presents potential radiation doses to staff and the public in the surrounding areas; and describes DOE-required data quality assurance methods used for data verification.

is proposing to close the Nonradioactive Dangerous Waste Landfill (NRDWL) and Solid Waste Landfill (SWL) located in the 600 Area of the Hanford Site. The closure of the NRDWL/SWL entails the construction of an evapotranspiration cover over the landfill. This cover would consist of a 3-foot (1-meter) engineered layer of fine-grained soil, modified with 15 percent by weight pea gravel to form an erosion-resistant topsoil that will sustain native vegetation. The area targeted for silt-loam borrow soil sits in Area C, located in the northern central portion of the Fitzner/Eberhardt Arid Lands Ecology (ALE) Reserve Unit. The pea gravel used for the mixture will be obtained from both off-site commercial sources and an active gravel pit (Pit #6) located just west of the 300 Area of the Hanford Site. Materials for the cover will be transported along Army Loop Road, which runs from Beloit Avenue (near the Rattlesnake Barricade) east-northeast to the NRDWL/SWL, ending at State Route 4. Upgrades to Army Loop Road are necessary to facilitate safe bidirectional hauling traffic. This report documents a cultural resources review of the proposed activity, conducted according to Section 106 of the National Historic Preservation Act of 1966.

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