This will be determined on a case by case basis. Most non-federal cost share requirements are established by statute, regulation, or policy, so any possible flexibilities depend on the specific grant program. EPA may not waive statutory cost share requirements unless the statute itself provides authorization and waivers of regulatory cost share requirements typically require a regulatory exception under 2 CFR 1500.3. There may be situations in which EPA may consider whether a recipient can meet its cost share requirements through pre-award costs to the extent authorized by 2 CFR 200.306, 2 CFR 200.458 and 2 CFR 1500.8. Note, however, that the rule at 2 CFR 200.306(b)(5) that funds from one Federal grant may not be used for cost share under another Federal grant unless there is statutory authority to do so remains in effect.