Office of Environmental Services

P.O. Box 4313
Baton Rouge, LA  70821-4313
Phone: (225)219-3181

FAX: (225)219-3309 

Tegan Treadaway

Assistant Secretary
Office of Environmental Services 

Treadaway received a Bachelor of Science in Biochemistry and a Bachelor of Science in Chemical Engineering from Louisiana State University. She has worked in the Air Permits Division at DEQ for more than 10 years and was recently appointed Assistant Secretary. 

Organization and Functions

The Office of Environmental Services is divided into four divisions:  

Cheryl Nolan

Air Permits

Nolan received her Bachelor of Science in Biology from Louisiana College and a Master of Science in Biology from Northeast Louisiana University. She was appointed to serve as the Administrator for the Air Permit Division in 2005. Prior to her appointment, she worked in air enforcement and water permitting and enforcement with the department. She has been with the DEQ for more than 15 years. Prior to this appointment, Nolan served as Assistant Secretary for the Office of Environmental Services

Function: To ensure the protection of air quality by issuing permits and standards protective of human health and the environment.
  • Air Permits
  • Air Permits Procedures and Guidance
  • Emission Reduction Credits (ERC) Banking
  • Air Permit Data Upload (APDU)
  • State Implementation Plan
  • Stack Testing
  • Air Dispersion Modeling
  • Air Toxics and Criteria Pollutant Emission Inventories


 Scott Guilliams

Water Permits

Function: To ensure the protection of water quality by issuing permits and standards protective of human health and the environment.

 Guilliams has been with DEQ for 21 years and has served in many different positions. Heworked in hazardous waste surveillance and permitting, as well as UST registrations, solid waste permitting and industrial water permitting. He has a Bachelor of Science in Zoology from LSU and recently served as the manager of the Industrial Water Permits section.  Guilliams is now serving as administrator of the Water Permits Division.

  • Biosolids Permits
  • Industrial Water Permits
  • Municipal and General Water Permits
  • Water Quality Modeling
  • Water Quality Standards and Assessment 
Lewis "Dutch" Donlon
Waste Permits  

 Function: To ensure protection of the soil and groundwater resources by issuing permits and standards that are protective of human health and the environment. 

        Donlon received a B.S. in Geology from the University of Southwestern Louisiana in 1985. Afterworking four years in petroleumexploration in Lafayette, Louisiana, he began his career in environmental geology in 1989 with the LDEQ, Groundwater Protection Division.


  Solid and Hazardous Waste Permitting and Construction  

  •  Permiting of Solid and Hazardous Waste Facilities
  •   Review Landfill Construction Quality Assurance Testing Data
  •    Review of Comprehensive Performance Test (CPT) Plans for Hazardous Waste Combustors
  •  Oversight of CPT Compliance Burns and Review of CPT Test Results
  •    Review Groundwater Monitoring Plans and Reports, Groundwater Monitoring Well Installation or Plugging  and    Abandonment Plans and Reports, Alternate Source or Natural Variability Demonstration Reports, and Corrective Action Plans and Reports
  •  Evaluate Groundwater Monitoring and Statistical Data
  •   Review Closure Plans
  •   Conduct Groundwater Monitoring System Inspections
  •   Review Authorization for Used Oil Transfer Facilities and HW-1 Forms
  •   Review facility’s proposed operation
  •   Review P.E. certified SPCC plan
  •   Perform start up inspections
  •   Grant/Deny UOTF authorization 

Lourdes Iturralde


Public Participation and Permit Support Division

Iturralde received a Bachelor of Science Degree in Microbiology from Louisiana State University and received a Master of Science Degree in Microbiology from Texas A&M University.  She has been employed with DEQ since 1990.  She has more than 20 years in the Enforcement Division  of DEQ in various positions, including supervisor, manager, and administrator.  Iturralde was  promoted to Enforcement Administrator in March 2008 and in September 2010 was moved to administrator in the Public Participation and Permit Support Services Division.

Function: To facilitate public participation and provide administrative, database, certifications, accreditations and notifications support to the media-based permits division.  

  • Administrative Completeness of Applications
  • Questions about Applications
  • Change of Names
  • Permit Transfers
  • Public Hearings
  • Public Notices
  • TEMPO Masterfile Maintenance
  • Standards Requirement Library
  • TEMPO Reference Tables
  • Registering of Solid Waste Transporters and Generators
  • RCRA Info Database
  • Annual Hazardous Waste Reports
  • Asbestos and Lead Accreditations
  • Asbestos and Lead Training Providers
  • Asbestos Notifications for Demolition and Renovations
  • Asbestos Disposal Verification Forms (ADVFs)
  • Lead Project Notifications
  • Lead letters of approval for contractors
  • Louisiana Environmental Lab Accreditation Program
The mission of the environmental services program is to ensure that the citizens have a clean and healthy environment to live and work in for present and future generations. This will be accomplished by regulating pollution sources, providing permitting activities consistent with laws and regulations, providing interface between the department and businesses and customers, providing permit support services and improved public participation The permitting activity will provide single entry/contact point for permitting, including a multi-media team approach; improved permit tracking; and the ability to focus on applications with highest potential for environmental impact.


Louisiana Department of Environmental Quality 602 N. Fifth Street Baton Rouge, LA 70802
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