1) Did the District Court err when it determined that costs incurred by FAWS in sampling, testing and analyzing well water samples of its members' private drinking water wells are not reimbursable as response costs under CERCLA? 

2) Did the District Court err when it upheld EPA's determination that the ERA constitutes an ARAR, and, accordingly finding that EPA's reopening the Consent Decree based on that ARAR and ordering further remedial action in the UAO was proper? 

3) Did the District Court err when it vacated as arbitrary, capricious, or contrary to law EPA's determination that BELCO is not required to install filtration systems in Fartown despite the existence of the ERA? 

4) Did the District Court err in retaining jurisdiction over FAWS' remaining state law tort claims after resolving the federal claims?