Malan v. Martinez Refining Company LLC

Case No. 23-cv-04184-HSG (N.D. Cal. Sept. 30, 2025) · United States District Court for the Northern District of California · September 30, 2025 · No. 23-cv-04184-HSG

Summary

The United States District Court for the Northern District of California denied Plaintiff David Malan’s motion for class certification in a suit concerning particulate emissions, odors, and alleged property damage from an oil refinery. The court held that individualized issues concerning harm, causation, and injury would predominate over common issues under Federal Rule of Civil Procedure 23(b)(3). The order also begins addressing motions to seal, applying the compelling-reasons standard.

Holdings

  1. Class certification was improper because Plaintiff did not prove by a preponderance of the evidence that common issues predominated over individualized issues concerning whether the refinery's emissions caused harm to individual class members and properties.
  2. For purposes of predominance, Plaintiff had to demonstrate a method of proving class-wide harm caused by Defendant's emissions; individualized damages calculations alone would not defeat certification, but individualized proof of whether any class member suffered harm could do so.
  3. The motions to seal were granted in part and denied in part: confidential settlement agreements and personally identifying information in a resident-communications spreadsheet could remain sealed or redacted, while other requested sealing was denied.

Questions Presented

  1. Whether Plaintiff satisfied Federal Rule of Civil Procedure 23(b)(3)'s predominance requirement for a proposed class asserting nuisance, negligence, and trespass claims based on refinery emissions.
  2. Whether the evidence showed that harm or injury could be established with common, class-wide proof rather than individualized evidence for each property or class member.
  3. Whether specified class-certification materials should remain under seal under the compelling-reasons standard.

Disposition

other

Cases Cited (22)

  • Mazza v. Am. Honda Motor Co., Inc., 666 F.3d 581, 588 (9th Cir. 2012)(cited; noted as overruled on other grounds)
  • Olean Wholesale Grocery Coop., Inc. v. Bumble Bee Foods LLC, 31 F.4th 651, 665 (9th Cir. 2022)(followed)
  • Comcast Corp. v. Behrend, 569 U.S. 27, 33-34 (2013)(followed)
  • White v. Symetra Assigned Benefits Serv. Co., 104 F.4th 1182, 1192 (9th Cir. 2024)(followed)
  • Tyson Foods, Inc. v. Bouaphakeo, 577 U.S. 442, 453 (2016)(followed)
  • Amchem Prods., Inc. v. Windsor, 521 U.S. 591, 623-24 (1997)(followed)
  • Abdullah v. U.S. Sec. Assocs., Inc., 731 F.3d 952, 957 (9th Cir. 2013)(followed)
  • Wolin v. Jaguar Land Rover N. Am., LLC, 617 F.3d 1168, 1172 (9th Cir. 2010)(cited)
  • Birke v. Oakwood Worldwide, 169 Cal. App. 4th 1540, 1548 (2009)(followed)
  • Mendez v. Rancho Valencia Resort Partners, LLC, 3 Cal. App. 5th 248, 262-63 (2016)(followed)

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