Consumers Energy has resumed some directional drilling projects in the aftermath of a house explosion in Royal Oak earlier this month.  By Monday Consumers expects to have all crews fully operational.  Consumers had suspended all directional drilling projects after an explosion on Cooper killed the homeowner.  At the time of the explosion a Consumers Energy spokesperson said it appeared that work on the replacement of a three-inch gas line in the neighborhood caused the rupture.  Since the suspension the company has reviewed its operating procedures with workers.    Federal regulations require ongoing training for crews that install gas lines.