Michael Kiparsky quoted in The Bay Nature Institute, September 17, 2013
“When a hole is drilled, it creates a conduit through which oil, gas, and fracking fluids could move upwards,” Kiparsky says. “If there was a casing failure, that movement into the bottom of the aquifer could happen within hours or days, but wouldn’t necessarily be expressed at the surface, or be visible, for decades or centuries.”… Kiparsky warns of the risks of irreversible contamination of surface and groundwater near wells, unless the method is carefully monitored and controlled.