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Environmental Expert Witness

Expert Witness and Litigation

Ashworth Leininger Group's litigation support practice leverages our demonstrated technical expertise in environmental compliance and permitting matters. ALG’s principals have been admitted as expert witnesses and supported legal counsel in a variety of complex litigation matters over alleged violations of the federal Clean Air Act and California Clean Air Act.

Federal Cases

  • NSR and PSD: ​New and modified industrial source compliance with the U.S. Environmental Protection Agency (EPA) preconstruction approval programs:

    • New Source Review (NSR) and

    • Prevention of Significant Deterioration (PSD) programs;

  • NESHAP: Compliance with the EPA Benzene Waste NESHAPS at chemical plants and industrial sources;

  • Commercial, industrial, and retail facility compliance with applicable federal and state air quality regulations;

Our Strengths

ALG routinely supports legal counsel in resolution of EPA, state, and local agency enforcement matters. This work typically includes focused technical analyses of historic activities and emissions, engineering studies relative to control requirements (LAER, BACT, BARCT, RACT and MACT/NESHAP), ambient air quality/health risk analyses as necessary to confirm potential impacts, settlement histories and compliance analyses relative to applicable requirements. ALG staff has participated as technical experts at scores of administrative proceedings (both local variances and orders for abatement) before state and local environmental hearing boards​.

Region-Specific Cases

  • Challenging the necessity or cost effectiveness of proposed State Implementation Plan amendments identified as necessary to achieve nonattainment plan goals;

  • Fleet Regulations: Compliance with EPA and California Air Resources Board fleet regulations for both on-road and off-road fleets;

  • Compliance with California Air Resources Board Consumer Product regulations;

  • Prop 65: California Proposition 65 prior warning requirements;

  • CEQA: Project approvals under the California Environmental Quality Act (CEQA)

Our Team

ALG’s dedicated litigation support team works directly with legal counsel to address pending legal matters.  ALG's team are prepared to conduct site audits, staff interviews, and detailed document reviews as necessary to evaluate compliance pertaining to the pending legal issues. 

"Seasoned, experienced and personable with industry smarts, the whole ALG crew are THE "go to" air quality experts for all my industrial clients in California. Time and again, they have provided the technical underpinnings so necessary to "win the day" at air quality hearings, rule makings and enforcement proceedings."

- Environmental Lawyer, Los Angeles

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