DEP inspections show more shale well cement problems

DEP inspections show more shale well cement problems by Laura Legere, September 18, 2011, The Times Tribune
But in the three dozen instances when methane has migrated into water supplies from gas wells in Northeast Pennsylvania, cement flaws have been identified by state regulators as a primary pathway for the gas. …”One case of methane migration or well contamination is one case too many,”