ERDC/CRREL TR-11-3 Project no. ER-0630 DEMONSTRATION/VALIDATION OF THE SNAP SAMPLER PASSIVE GROUNDWATER SAMPLING DEVICE AT THE FORMER McCLELLAN AIR FORCE BASE Cold Regions Research and Engineering Laboratory Louise Parker, Nathan Mulherin, Tommie Hall, Constance Scott, Kelsey Gagnon, Jay Clausen, William Major, Richard Willey, Jacob Gibs, Thomas Imbrigiotta, and Donald Gronstal February 2011 Approved for public release; distribution is unlimited.