Researchers from the University of Pittsburgh's Graduate School of Public Health presented research results at an EPA workshop on the fate and transport of waste water from fracking in March 2011 and formally published their results last March in the journal Environmental Science and Technology. They found high levels of barium, benzene, chlorides, strontium, and other contaminants at the end of the outflow pipe in excess of state and federal water-quality standards.
Four months after the EPA workshop, Pennsylvania's Department of Environmental Protection collected sediment samples from inside the discharge pipe at the site and found radium-226 levels some 44 times higher than drinking-water standards allow. Several tens of yards downstream, levels were 66 times higher than standards allow. Radium-226 has a half-life of 1,600 years. Read more at the Christian Science Monitor article here.