Malan v. Martinez Refining Company LLC

Background

Martinez Refining Company LLC operates an oil refinery that processes crude oil into gasoline and jet fuel. David Malan alleged that the refinery released particulate matter, petroleum coke, spent catalyst, wastewater odors, and other emissions into the surrounding residential area. He alleged that these emissions interfered with residents’ comfortable use and enjoyment of their property and caused property damage, including damage to gardens, lawns, soil, and other plants.

Malan asserted four California-law claims: public nuisance, private nuisance, negligence, and trespass. He sought to represent all owner-occupants and renters of residential property within one mile of the refinery from August 16, 2020, to the present. He estimated that the proposed class included approximately 3,761 households. The motion before the court sought class certification, not a final decision on whether the alleged emissions caused liability or damages.

Class-Certification Analysis

Federal Rule of Civil Procedure 23 requires a proposed class to satisfy four preliminary requirements: enough members that individual lawsuits would be impractical, common legal or factual questions, claims typical of the class, and adequate representation. For the type of class proposed here, Rule 23(b)(3) also requires that common questions predominate over individual questions and that a class action be the superior way to resolve the dispute.

The court focused first on predominance. It recognized that common questions existed, including whether MRC’s conduct in releasing particulate matter and odors fell below the applicable standard of care. But the court concluded that the central question for each claim was whether MRC’s conduct caused harm or injury to each plaintiff and proposed class member.

The court found that Malan had not proved that harm could be established with class-wide evidence. Evidence about the frequency of emissions and MRC’s failure to use what Malan considered the best available technology showed MRC’s conduct, but did not establish harm to every class member. The atmospheric-dispersion modeling submitted by Malan’s expert showed that particulate matter traveled throughout the proposed class area, but it also showed variation in concentrations. The modeling did not determine the extent, severity, or frequency of the emissions or establish the level of harm at each property. The court also found that the relevant government modeling showed variation and was designed to identify areas for soil sampling, not areas of community impact.

The court distinguished individualized calculations of the amount of damages—which alone would not defeat class treatment—from individualized proof of the underlying harm required to establish liability. Because the alleged property interference and damage appeared to vary from property to property, the court concluded that individualized issues would overwhelm the common issues. The court therefore denied the motion for class certification, Dkt. No. 83.

Motions to Seal

The court also ruled on two motions concerning material that MRC had designated as confidential during discovery, Dkt. Nos. 96 and 106. The court denied sealing for portions of Malan’s class-certification motion and Exhibit 31. MRC sought to keep Exhibits 29 and 30—confidential settlement agreements—and personally identifying information in Exhibit 26 from public view. The court found compelling reasons to protect the settlement terms, litigation-strategy information, and individuals’ names and contact information, and allowed those materials or portions to remain sealed.

The court therefore granted in part and denied in part the motions to seal. It directed Malan to file an unredacted version of the class-certification motion, Exhibit 31, and Exhibit 28 within seven days. The court also set a case-management conference for October 28, 2025, in this case and the related cases, and directed the parties in those cases to meet and confer and file a joint case-management statement by October 21, 2025.