documents that describe purpose and need, evaluate alternatives, characterize the affected environment, and identify the environmental impacts associated with a proposed action. We provide high-quality services including the preparation of several NEPA environmental documents including:

  1. NEPA Environmental Assessments (EA)
  2. NEPA Environmental Impact Statements (EIS)
  3. Categorical Exclusion (CX) Determinations
  4. Environmental Baseline Surveys
  5. Biological Assessments (BA)
  6. Findings of No Significant Impact (FONSI)
  7. Records of Decision (ROD)


Thunderbird’s core natural resource and ecological services range from wildlife habitat evaluations to threatened and endangered species investigations and environmental permitting. Our comprehensive natural resource and ecological services include:

  1. Avian Surveys and Monitoring
  2. Threatened, and Endangered Species Surveys
  3. Wildlife Habitat Evaluations
  4. Wetland Delineation and Functional Assessments
  5. Aquatic Habitat Restoration
  6. Macroinvertebrate Sampling and Analysis
  7. Fish Surveys
  8. Clean Water Act Section 316(b) Compliance
  9. Vegetation Surveys and Mapping
  10. Natural Resource Damage Assessments

Remedial Investigation, Planning and Oversight Services

Thunderbird staff members have extensive experience with assessment and characterization of contaminated sites ranging from site assessments for property transactions to urban redevelopments, PCB sites, energy facilities, waterfront improvements, and federally regulated cleanup projects.Thunderbird’s remedial investigation, planning and oversight services include:

  • Sampling and Analysis Plans
  • Evaluation of Cleanup Criteria
  • Environmental Liability Assessments and Management Strategies
  • Groundwater and Subsurface Investigations
  • Surface Water and Sediment Sampling
  • Database Management and Development
  • Data Analysis and Reporting
  • Hydrologic and Hydraulic Modeling 
  • Groundwater Modeling
  • Contaminant Fate and Transport Modeling
  • Risk Assessment
  • Soil Gas Surveys
  • Landfill Leachate Evaluation
  • NAPL and DNAPL Delineation
  • Indoor Air Monitoring
  • Construction Inspection and Environmental Monitoring

Environmental Assessments

Thunderbird Environmental LLC staff have completed hundreds of environmental site assessments for our federal and private sector clients throughout North America. Our team of site assessment professionals are well versed in the Phase I Environmental Site Assessment (ESA) process and have extensive experience assisting clients with the property ownership transfer and due diligence process. Thunderbird provides the following environmental assessment services:

  • ASTM Phase I Environmental Assessments
  • Phase II Soil and Groundwater Investigations
  • Phase III Environmental Investigations
  • Soil Vapor Sampling and Vapor Intrusion Assessments
  • Data Base Searches for Natural Resource Conservation Service (NRCS) Easements
  • Due Diligence Assessments prior to Purchase, Sale, and Leasing of Real Property
  • Groundwater Monitoring Services
  • Licensed Environmental Professional Services
  • Drinking Water Supply Well Receptor Surveys
  • Ecological Risk Assessments 

our services

NEPA Support and Ecological Studies​​​

Thunderbird provides a full range of NEPA assessment and documentation support including completion of Environmental Assessments (EA), Environmental Impact Statements (EIS), and ecological studies. Thunderbird has a vast network of trusted teaming partners and subject matter experts that enable us to assist our federal and private sector clients with the NEPA process in a rapid, efficient, and defensible manner. We prepare comprehensive environmental

Underground Storage Tank Removal Oversight and Closure Services

Thunderbird provides underground storage tank removal oversight and closure services, including tank excavation inspection, post-excavation confirmatory soil sampling, soil remediation oversight, and post-closure reporting. Our services include communication and correspondence with property owners, legal counsel, regulatory officials and third parties.

Industrial Health and Safety Support

Thunderbird provides federal and private sector clients with safety program development, compliance assistance and auditing, and training programs. We practice what we preach by maintaining a strong culture and commitment to ensuring our own employees’ health and safety. We take pride in our safety programs and strive to develop tailor-made solutions that meet your organization’s specific compliance needs. Our range of written safety programs can be based upon key targets for OSHA inspections, such as: Emergency Action Plans, Hazard Communication Plans, Permit Required Confined Space Entry Programs, and Personal Protective Equipment/Job Hazard Analysis. We also help clients develop their process safety management programs from the ground up. Our trusted network of specialized subcontractors enables us to provide even greater EHS support to our clients, including Certified Industrial Hygienist (CIH) services.

Stormwater Management and Water Resource Protection

Thunderbird offers a wide range of stormwater and water resource protection services from stormwater management plans and design development to permitting and compliance monitoring. Our experience includes addressing our client’s stormwater issues during both construction and operations of their developments and facilities. Our stormwater and water resource management and stormwater services include:

  • Stormwater Pollution Prevention Plans (SWPPP)
  • National Pollutant Discharge Elimination System (NPDES) Permitting and Compliance
  • Stormwater Sampling and Reporting
  • Federal, State, and Local Permitting
  • Watershed and Water Quality Assessments
  • Water Supply Well Receptor Surveys and Drinking Water Assessments
  • Stream Flow Monitoring
  • National Pollutant Discharge Elimination System (NPDES) Permitting and Compliance
  • Pollutant Loading and TMDL Assessments