Several individuals were instrumental in completing this study. For their contributions
we thank Laboratory Technicians Vanessa Davila, Jessica Jancaric, Whitney Klein, Sandhya
Sivaskndan, and Tze Yi The for sample preparation and analysis and Field Technicians Walter
Dedoncker, Jeremy Esin, Caleb Hogan, Jeff MacDonald, and John Mills for sample collection
in the field. The project was executed with funding from the Iowa Department of Natural
Resources (Contract No. 2014ESDGSBMBalm0004).