Sentences with phrase «active drilling sites»

Further evidence for the difference between methane from water wells near active drilling sites and neighboring nonactive sites is the relationship of methane concentration to δ13C - CH4 values (Fig. 4A) and the ratios of methane to higher - chain hydrocarbons versus δ13C - CH4 (Fig. 4B).

• Ambient and occupational air quality should be measured at active drilling sites and be compared with baseline measurements in adjacent areas without drilling operations.

Not exact matches

They found that wells located within 1 kilometre of an active shale - gas drilling site contained 17 times as much methane on average as those further away.