Trace element concentration data
Selenium, Arsenic, Cadmium data daily concentration for USGS stream sites. 

This dataset is associated with the following publication:
Beyene, M., S. Leibowitz, C. Dunn, and K. Bladon. To Burn or Not to Burn: An Empirical Assessment of the Impacts of Wildfires and Prescribed Fires on Trace Element Concentrations in …