Vengosh WV Shale Gas Spill (IMAGE) Duke University Caption Fracking sites like this apparently have not harmed groundwater after three years of operation in northwestern West Virginia, but their spills may pose a threat to surface water, according to a new Duke-led study. Credit Avner Vengosh, Duke University Usage Restrictions None 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.