Water Sampling (IMAGE) American Society of Agronomy Caption Graduate students Heather Luken and Tanner Williamson collect water samples from an automated sampler on Four Mile Creek. The autosampler collects a water sample from the stream every seven hours, and stores 24 samples in the carousel of bottles shown here. Credit Carrie Ann Sharitt 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.