As the Nova Scotia (N.S.) government conducts a review of the environmental effects associated with hydraulic fracturing, a new study by scientists at Duke University found that the drilling technique, which is used to free natural gas trapped in shale rock formations, can contaminate drinking water.
The study - "Methane contamination of drinking water accompanying gas-well drilling and hydraulic fracturing" - collected data from groundwater tests conducted at 68 private drinking water wells in the Marcellus and Utica shale drilling areas from 36- to 190-m deep in northeastern Pennsylvania and southern New York State.
Of those 68 wells, 60 were tested for dissolved methane. (All wells were analyzed for, among other things, dissolved salts, water isotopes and isotopes of dissolved constituents - carbon, boron, and radium.)
The study found methane concentrations in 51 of the 60 wells.