Collecting Sediments (IMAGE) DOE/Pacific Northwest National Laboratory Caption PNNL researcher Dave Kennedy collects sediments from the hyporheic zone along the Columbia River in Richland, WA. Credit Photo courtesy of PNNL Usage Restrictions Please give credit: Photo courtesy of PNNL 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.