Greene County Chancellor Douglas Jenkins has thrown out the remaining claims in a suit brought by local residents opposed to the US Nitrogen project on Pottertown Road.
Jenkins, who already had dismissed many of the claims in the original suit, announced the decision in a Friday court session.
The suit against the county and various boards and agencies challenged the legality of favorable actions for the project by county commissioners.
Jenkins, however, dismissed the claims, including charges that the state open meeting law was violated in the approval process.
Jenkin's order of summary judgment can be challenged in an appeal, but plaintiffs could not be reached for comment on that possibility.
A second suit challenging the project and approvals given by the Tennessee Department of Transportation is still pending in Davidson Chancery Court.
A motion for dismissal in that case is pending.
The court action comes as US Nitrogen announced plans this week to begin testing of the $220 million ammonium nitrate manufacturing facility, including a double barreled 12 mile pipeline from the plant to the Nolichucky River.