The petitioning state is entitled to relief if EPA finds that the sources are significantly contributing to the petitioning state's nonattainment problem.
If the EPA discovers that there is a lot of contribution to the petitioning state's non-attainment problem, then they are entitled to relief. 
If the EPA discovers that there is a lot of contribution to the petitioning state's non-attainment problem, then they aren't entitled to relief.