Soil Sampling Rio Grande (IMAGE) American Society of Agronomy Caption Students collect soil samples after flooding of the Rio Grande floodplain to determine triclosan levels in soils. Credit Photo credit Monica Mendez. Usage Restrictions Please use with story only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.