This article was written by ProPublica's Abrahm Lustgarten. Pat Farnelli, top left, Ronald Carter, bottom left, Richard Seymour, top right, and Norma Fiorentino, bottom right, live in Dimock, Pa. A year after Cabot Oil & Gas landmen knocked on their doors to sign drilling leases, they are finding that their drinking water now contains methane, the largest component of natural gas. Abrahm Lustgarten / ProPublicaNorma Fiorentino's drinking water well was a time bomb. For weeks, workers in her small northeastern Pennsylvania town had been plumbing natural gas deposits from a drilling rig a few hundred yards away. They cracked the …