DISCLAIMERThis report was prepared as an account of work sponsored by an agency of the United States Government. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or Battelle Memorial Institute. This report is a summary of major or significant activities occurring at the Hanford Site only, and is not a full disclosure of all details associated with Hanfordrelated activities, nor a substitute for legally required information subject to reporting requirements regarding releases, violations, etc. PACIFIC NORTHWEST NATIONAL LABORATORY operated by iii U.S. Department of Energy (DOE) Order 5400.1, "General Environmental Protection Program," establishes the requirement for environmental protection programs at DOE sites and facilities. These programs ensure that DOE operations comply with applicable federal, state, and local environmental laws and regulations, executive orders, and department policies. This Hanford Site environmental report is prepared annually pursuant to DOE Orders 5400.1 and 231.1, "Environment, Safety, and Health Reporting," and DOE M 231.1-1, Environment, Safety and Health Reporting Manual, to summarize environmental data that characterize Hanford Site environmental management performance and demonstrate compliance status. The report also highlights significant environmental programs and efforts. More detailed environmental compliance, monitoring, surveillance, and study reports may be of value; therefore, to the extent practical, these additional reports have been referenced in Summary vii Regulation What it Covers 2000 Status Safe Drinking Water Act Drinking water supplies operated All Hanford drinking water systems by DOE were in compliance with guidelines according to the Washington State Department of Health. There was one exception on February 3, 2000, when sampling results showed the maximum contaminant level of coliform bacteria was exceeded at the 200-East Area, but no E.coli were found. 2000 Annual Environmental Report viii What was Monitored? The Bottom Line Air Air sampling equipment collected All measurements of radioactive and nonparticles and gases, which were radioactive materials in air were below analyzed for radioactive and non-recommended guidelines. radioactive materials. Air was sampled at 110 locations on Hanford, 11 perimeter locations, 8 nearby communities, and 2 distant communities. Columbia River Water Columbia River water was collected As in past years, small amounts of radiofrom 15 locations throughout the year. active materials were detected downriver Water samples were analyzed for from Hanford. However, the amounts were radioactive and chemical materials. all far below federal and state limits. Dur-Water in the Columbia River continues ing 2000, there was no indication of any to be designated Class A (Excellent) by deterioration of Columbia River water th...

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Because most changes for Rev. 1 were relatively minor, all individuals identified in the original distribution list who did not receive a copy of Rev. 1 were sent a cover letter describing the changes, a web address (http://sesp.gov/reports/reports.html) to view or print a PDF file of Rev. 1, and a copy of the Rev. 1 Preface. A limited distribution of Rev. 1 was made; however, hardcopies of PNNL-13692, Rev.1 are available upon request to Greg W. Patton at (509) 376-2027

The toxicity of U to Daphnia magna was determined in acute and chronic tests. The 48-hr LCso of U (VI) in Columbia River water was 6 mg L -~. Acute toxicity diminished by a factor of 7.5 as mean water hardness and alkalinity values increased from 70 mg L -~ and 57 mg L l to 195 mg L -~ and 130 mg L ~, respectively. This effect was most likely the result of complexation of uranyl ion with carbonate ions. D. magna reproduction was suppressed in Columbia River water at U concentrations between 0.5 and 3.5 mg L ~. Potential hazards of U to aquatic life are discussed as they relate to mining practices.