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Haynes and Boone, LLP

Mary Simmons Mendoza

Mary Simmons Mendoza


Haynes and Boone, LLP
Texas, U.S.A.

tel: +1 512 867 8418
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Mary Mendoza concentrates her practice in the areas of environmental and administrative law. She represents clients in regulatory compliance matters, hazardous and solid waste cleanups, contested case hearings, enforcement matters, appeals of agency decisions, and toxic tort litigation. Mary counsels clients on general issues of regulatory compliance as well as on environmental issues associated with real estate, corporate and other transactions.


  • J.D., University of Texas at Austin School of Law, 1994 with honors, Order of the Coif
  • B.S., Civil Engineering The University of Texas, 1991with highest honors; Tau Beta Pi
Areas of Practice
Professional Career

Significant Accomplishments

Oil and gas exploration and production company in UIC permitting hearings.
National oil company in a multimedia environmental audit of refinery/chemical production facility.
Energy auditing firm in regulatory matters before Texas Real Estate Commission.
A major manufacturer in defending a CERCLA cost recovery action.
Major retailer in the environmental issues associated with the acquisition and development of store locations.
A private equity fund in the acquisition of environmentally impaired assets out of bankruptcy.
A major manufacturer in responding to a CERCLA information request.
Purchaser of contaminated property in negotiating a bona fide prospective purchaser agreement with EPA.
A manufacturer of water treatment equipment in a four week jury trial regarding alleged design defects.
A major corporation in a multi-million dollar remediation of a contaminated site under the state voluntary cleanup program.
Regulated industries in permit proceeding before the Texas Commission on Environmental Quality.
Defendants in enforcement hearings before the Texas Commission on Environmental Quality and the Environmental Protection Agency.
Defendant in enforcement action relating to alleged Clean Air Act violations arising out of release from commercial refrigeration system.
Defendants in negotiations of RCRA and CERCLA cleanup orders with the Environmental Protection Agency.
Multiple companies in the settlement of CERCLA liabilities with the Environmental Protection Agency.
A multi state corporation in multimedia compliance audits of plant operations.
Major property management companies in the defense of mold lawsuits and in the development of mold policies.
An alternative fuels plant in connection with permitting before the TCEQ.
A seller in a divestiture involving multi state property transfer notifications.
A corporation regarding compliance counseling and divestiture of a water and wastewater supply corporation.
Entities in appeals of agency orders.
Multiple defendants in toxic tort litigation regarding a commercial waste disposal facility.
Manufacturers in negotiations with the Consumer Product Safety Commission relating to product recalls.
Entities in a contested case hearing related to horse race track licensing before the Texas Racing Commission.

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