Encana on defensive over groundwater fouled by fracking by Nathan Vanderklippe, December 8, 2011, The Globe and Mail
Other types of synthetic organic compounds, like tert-butyl alcohol – which is not expected to be found naturally in groundwater – were also discovered. Sampling showed the elevated presence of gasoline, diesel, benzene, toluene, ethylbenzene and xylene. Some of those substances matched with materials used in oil and gas work…. [Emphasis added]