Quality of Nutrient Data from Streams and Ground Water Sampled during Water Years 1992-2001
Dates
Year
2005
Citation
Mueller, D. K., and Titus, C. J., 2005, Quality of Nutrient Data from Streams and Ground Water Sampled during Water Years 1992-2001: United States Geological Survey, v. Scientific Investigations Report 2005–5106, p. 27-27.
Summary
This report describes the quality of nutrient data in stream and ground-water samples collected in 52 NAWQA study units during water years 1992-2001 based on an analysis of contamination bias and sampling variability. The results of this QC analysis are compared to characteristics of the environmental data and to national water-quality standards and criteria to assess the potential effects of bias and variability on interpretation of the environmental data. The NAWQA study units that provided the QC data represent a broad array of hydrologic conditions in the 48 contiguous States and Alaska and Hawaii. The data were aggregated into a national data set during the spring of 2002 and were extensively reviewed.
Summary
This report describes the quality of nutrient data in stream and ground-water samples collected in 52 NAWQA study units during water years 1992-2001 based on an analysis of contamination bias and sampling variability. The results of this QC analysis are compared to characteristics of the environmental data and to national water-quality standards and criteria to assess the potential effects of bias and variability on interpretation of the environmental data. The NAWQA study units that provided the QC data represent a broad array of hydrologic conditions in the 48 contiguous States and Alaska and Hawaii. The data were aggregated into a national data set during the spring of 2002 and were extensively reviewed.
