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of the U.S. Geological Survey (USGS). Brent Aulenbach of the USGS provided technical review and support for the implementation of a modified regression load estimation approach to incorporate stormwater composite samples. Leslie Desimone of the USGS provided a thorough technical review and recommendations for handling trend analyses.

U.S. Geological Survey personnel contributed to the study in several ways. Natasha Drotar provided support for field sample collection, processing, and sample analysis. Kimberly Campo provided support for calibration and maintenance of continuous water-quality monitoring in the field. Jason Sorenson helped install flow-gaging and other equipment at field locations. Kirk Smith developed the software programs that were used to control composite sample collection, data retrieval, data review, and data archiving and provided valuable insights into data interpretation. Laura Blake and Leslie DeSimone provided expertise in design of the water-quality sampling and processing protocols and data review and validation. Nick Stasulis, Greg Stewart, and Gardner Bent provided information on methods of discharge measurement.