Scientific Investigations Report 2007–5180
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5180
Figure 1. Relation between the absolute difference (AD) and relative percent difference (RPD) of environmental-replicate samples, Yakima River Basin, Washington, 2000. Shaded area is defined by sample pairs where the AD is greater than 0.01 µg/L and the RPD is greater than 50 percent. Samples that plot in this area are discussed in text.