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Tribal, and local levels in making sound management decisions. To a significant extent, these responsibilities are being carried out in the National Water-Quality Assessment (NA WQA) Program, whose goals include providing a sound understanding of the natural and human factors that affect water quality. The NA WQA Program will include investigations in 60 study areas throughout the Nation that represent a variety of geologic, hydrologic, climatic, and cultural conditions. These studies are building blocks for understanding regional differences in physical, chemical, and biological characteristics of the Nation' s ground water and surface water. An important goal of the program is to ensure that key findings are available to the public so that they can be aware of the quality of the Nation' s water resources. This report is part of a series of nontechnical publications based on results from the NA WQA Program. The purpose of these publications is to describe key findings from the individual investigations and to relate those findings to water-quality issues of regional and national concern. By disseminating this information, the U.S. Geological Survey seeks to increase awareness of water-quality concerns when considering the Nation's environmental issues. Director A sa former governor of an arid state, I have a special appreciation for the value of water resources. Unless we have sufficient supplies of good quality water when and where we need it-and understand how natural and human conditions affect water quality-we cannot wisely manage this vital resource.

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29. Concentrations of semi-volatile organic compounds (polycyclic-aromatic hydrocarbons) in aquatic biota, Yakima River basin, Washington, 1989-90 ------Quality Assurance Data Water Column 30A-H. Concentrations of carbamate compounds in replicate and (or) spiked whole-water samples from the following locations, Washington: 30A.