The Commonwealth of Pennsylvania v. Exxon Mobil Corporation

Background

This case is part of the multidistrict litigation concerning methyl tertiary butyl ether, or MTBE, products. The Commonwealth moved on May 14, 2025, for reconsideration of the court’s April 30 Opinion. That earlier opinion granted defendants partial summary judgment on the Commonwealth’s request for future costs of investigating MTBE contamination at certain “Focus Sites.” Summary judgment is a decision that resolves a claim when the evidence shows there is no genuine dispute requiring a trial on that issue.

In the alternative, the Commonwealth asked the court to certify the April 30 Opinion for an interlocutory appeal under 28 U.S.C. § 1292(b). An interlocutory appeal is an appeal before the district court has entered a final judgment in the case.

Motion for Reconsideration

The court described reconsideration as an extraordinary remedy. It said reconsideration generally requires an intervening change in controlling law, newly available evidence, or a need to correct clear error or prevent manifest injustice. The court found that the Commonwealth had not identified clear error.

The Commonwealth argued that the April 30 Opinion ignored or undervalued the value of “plume delineation,” meaning investigation of the location or extent of underground contamination. The court responded that the usefulness of investigation did not establish that defendants were legally required to pay for it. To avoid summary judgment, the Commonwealth had to show that a jury could find, more likely than not, that it had suffered or would suffer nonspeculative damages caused by defendants’ conduct.

The court acknowledged that MTBE had been found at every Focus Site, but said that did not establish the Commonwealth’s entitlement to every cost it considered useful. The Commonwealth sought investigation costs to determine whether additional restoration or remediation might be needed. For the Focus Sites at issue, however, the court found that the Commonwealth could not show it was more likely than not that investigation would reveal contamination requiring additional work. The court also stated that the Commonwealth’s own expert could not say that further restoration was needed at any of those sites.

The court rejected the Commonwealth’s reliance on other decisions. It explained that a Pennsylvania Superior Court decision concerning the Hazardous Sites Cleanup Act did not apply because that statute did not govern this cause of action and excluded petroleum products and natural gas from the relevant definition. The court also found that Pennsylvania medical-monitoring cases did not support the requested investigative costs because those cases concerned testing for a future health risk, whereas the Commonwealth identified no future harm and sought investigation of long-past releases. The court likewise rejected the Commonwealth’s attempt to distinguish an earlier decision in the MTBE multidistrict litigation concerning future investigative costs where there was no evidence that restorative measures were necessary or would be implemented.

Motion for Interlocutory Appeal

The court also denied certification for an interlocutory appeal. It explained that certification under Section 1292(b) is limited to exceptional circumstances and requires the moving party to show, among other things, that an immediate appeal could materially advance the litigation’s ultimate termination.

The court found that the Commonwealth had not made that showing. The dispute concerned one category of costs among many sought in the eleven-year-old case, and the April 30 Opinion addressed one of ten motions for partial summary judgment filed by the parties. The Commonwealth did not explain why an immediate appeal, rather than an appeal after final judgment, would meaningfully advance resolution of the case.

Disposition

The court denied the Commonwealth’s May 14, 2025 motion for reconsideration and, in the alternative, for certification of an interlocutory appeal.