Chelsea Grossi


Phone 303.892.7491

Chelsea Grossi is an associate in the Natural Resources Department and Environmental Group of Davis Graham & Stubbs LLP. Her practice focuses on regulatory and litigation counseling in environmental, health and safety, and natural resources law. She works with oil and gas, mining, biofuels, industrial, aerospace, and manufacturing clients. Chelsea’s experience includes representing clients in environmental and safety administrative and civil litigation matters, negotiating settlements with enforcement agencies, and advising clients on a host of regulatory matters affecting the industry. Chelsea has experience counseling clients to compliance under the Clean Air Act (CAA), the Occupational Health & Safety Act (OSHA), the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA or Superfund), the Clean Water Act (CWA), the Emergency Planning and Community Right-to-Know Act (EPCRA), the Asbestos Hazard Emergency Response Act (AHERA), and the Pipeline and Hazardous Materials Safety Act (PHMSA). In addition, she advises clients on corresponding state statutory counterparts, such as in Colorado, Utah, North Dakota, California, Texas, Ohio, California, West Virginia, and Pennsylvania.

Chelsea also has experience counseling oil and gas clients on legal issues affecting upstream exploration and production activity, both on private and public lands. Her experience doing land work uniquely informs her ability to counsel oil and gas operators on environmental and regulatory issues. She has further represented clients in litigation matters relating to federal public lands management.

Prior to joining DGS, Chelsea was an associate at Stoel Rives LLP in Sacramento, California, where she advised the energy industry. During law school, Chelsea worked as a litigation law clerk at a boutique oil and gas firm in Denver and held a clerkship with the U.S. Attorney’s Office for the District of Colorado. She acted as a senior staff editor and contributor on the University of Denver Water Law Review and worked as a teaching assistant for first-year Civil Procedure students.

Chelsea is dedicated to serving the Colorado community. She serves as Fundraising Chair for the Rose Andom Center’s Young Professional’s Council, an organization that co-locates Denver organizations serving domestic violence survivors. She is also a part of the 2018 Colorado Oil & Gas Association Energy Generation (EnGen) Leadership Program. She volunteers as a tutor at University Prep, a tuition-free public charter school, and participates in the professional mentor program at the University of Denver Sturm College of Law. A former classical ballet dancer, Chelsea now prefers to spend time outdoors with her husband and black Labrador Retriever, reading fiction, and learning to play the piano.

Compliance & Enforcement

  • Represented oil and gas clients in responding to Clean Air Act § 114 information requests and subsequent enforcement proceedings.
  • Assisted and directed clients in performing privileged environmental audits of their facilities.
  • Represented oil and gas clients in various OSHA conferences, and counseled clients on OSHA requirements related to signage and hazard communication requirements, walking-working surfaces and personal fall protection, chemicals storage and handling, personal protective equipment, and vapor exposure issues.
  • Counseled oil and gas clients on the applicability of Spill Prevention, Control and Countermeasure requirements to their operations.
  • Drafted a Spill Response Manual for operators, spanning federal, state, county, local, and tribal reporting requirements.
  • Represented a Colorado biofuels processor in enforcement proceedings with the Colorado Department of Public Health and Environment.
  • Counseled a client on Texas Permit-by-Rule requirements under Texas Clean Air Act.
  • Counseled a client on hydrogen sulfide regulations in Texas and Colorado.
  • Represented a client in remediation efforts at multiple Superfund sites in California and Montana.
  • Advised a client on the potential for source aggregation at their airport facilities under the Clean Air Act.
  • Counseled environmental consultant client on Colorado Regulation No. 8 asbestos abatement and contractor certification requirements.
  • Prepared comments for various industry clients to rules proposed via the Administrative Procedure Act (APA), such as EPA’s recent proposed rule pursuant to 40 C.F.R. § 60, Subpart OOOOa.
  • Represented a mining client in efforts to obtain Endangered Species Act take permits.
  • Represented a retreat facility in response to CDPHE Compliance Advisory regarding wastewater treatment system.
  • Performed environmental due diligence for a transaction of uranium mining facilities; counseled on the potential for historic environmental liabilities.

Oil & Gas Regulatory Compliance & Enforcement

  • Represent clients before the Colorado Oil & Gas Conservation Commission on various environmental, health, and safety-related alleged violations.
  • Advised an oil and gas client on Colorado’s “one-call” reporting requirement prior to excavation near an existing pipeline.
  • Counseled a client on applicable Colorado technologically enhanced naturally-occurring radioactive materials (TENORM) occupational safety, licensing, handling, storage, and disposal requirements.
  • Drafted client manual spanning the full suite of BLM oil and gas production regulations impacting operations on federal lands.
  • Advised clients on recent developments in hydraulic fracturing regulations in California and those affecting federal lands.
  • Worked with a client to determine potential historic violations and successor liability related to Colorado pit construction and closure requirements.
  • Worked on the DGS team representing clients in various Colorado Oil and Gas Conservation Commission proceedings.

Environmental & Public Lands Litigation

  • Represented transporter PRP in ongoing CERCLA litigation pursuant to § 113(f).
  • Represented PRP subject to historic liability in pre-litigation negotiations with EPA and the applicable state environmental agency.
  • Worked on a team representing client in federal enforcement of the Clean Air Act in federal court.
  • Worked on a team representing mining industry groups, counties, and private parties impacted by the Bureau of Land Management’s Land Use Plan to conserve Sage Grouse habitat, which withdraws hundreds of thousands of acres of minerals from entry.
  • Represented a global mining client in various environmental and business-related litigation matters.
  • Represented an industry group client in an administrative rulemaking challenge in the D.C. Circuit.


University of Denver, J.D.

The Ohio State University, B.A., cum laude

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