The Environmental Sciences Division effort is directed toward furthering the understanding of the health, environmental, and societal consequences of energy-related activities. The scope includes aquatic and terrestrial ecology, studies of physical, chemical and biological processes, identification and characterization of pollutants, evaluations of control and mitigation measures, development of instrumentation, and assessments of energy-related impacts. Related to nuclear energy, the studies concentrate on the transport and long-term environmental behavior of plutonium and other selected radionuclides. Included are studies of the coastal and oceanic behavior of radionuclides, of their uptake and transfer through food pathways, of their biogeochemical cycling, and of the several radiological exposure pathways to man. The investigations, along with related monitoring activities, are being carried out in the Pacific and Atlantic Oceans, the. Marshall Islands, the Nevada Test Site, and the environment of nuclear installations. In support of these efforts, measurement and monitoring instrumentation is being developed. Information derived from these activities and the available literature is used in preparing evaluations of potential radiological doses and recommendations for mitigation ~ measures. In nonnuclear energy areas, similarly integrated approaches toward source terms, pathways, dosimetry, and assessment are being applied to 'a wide spectrum of problems. These activities include identification and characterization of effluents from direct combustion of coal and in situ conversion of coal and oil shale, studies of the transfer of contaminants through food pathways, identification of mechanisms and diagnostics for pollutant impacts on plants and plant ecosystems, investigation of the ecological effects of off-shore petroleum exploitation, monitoring and studies of the atmosphere, water quality, and ecosystems at geothermal and fossil-fuel development sites, and various problems in assessment and evaluation of the consequences of energy-related activities. Of major importance are the integrated environmental assessments of radiological dose commitments attendant to rehabitation of the Marshall Islands. Other comprehensive integrated assessments are being extended to in situ fossil fuel and other nuclear and geothermal sites. Significant accomplishments planned for Fiscal Years 1980 through 1982 include: Fiscal Year 1980 ® Completion of preliminary assessment activites for high priority a Known Geothermal Resource Areas.