D3G Helps

In our original founding as an Environmental due diligence firm,  D3G has perfected the Environmental Site Assessment process over our 30-year history. Staying current on industry standards, procedures, regulatory requirements, and guidance changes gives our environmental team an advantage in the technical knowledge needed to measure risk, identify potential hazards, and make recommendations specific to your project.

Our team is ready to help you navigate the multifaceted process of environmental assessments, guiding you through any unexpected issues or liabilities, connecting you to remediation experts, and ensuring you move forward with support and confidence. We pride ourselves on being responsive and delivering high-quality reports at a fair and competitive price.

Environmental Services

  • Phase I ESA

  • Phase II ESA

  • Asbestos, Lead Based Paint, & Radon Testing

  • National Environmental Policy Act (NEPA) Compliance

  • HUD Environmental Review Online System (HEROS)


Full service

With specialized subject matter experts and experienced inspection teams, D3G provides a full-spectrum of services ranging from Environmental Review and UST Removal to Radon testing and National Environmental Protection Agency (NEPA) consulting. We work with you from concept to closing.

Contamination Experts

We tackle the most challenging projects across the country. We have successfully guided many property owners and lenders through the process of evaluating and mitigating risk. Our staff has experience in nearly 50 states obtaining No Further Action letters from local environmental authorities to ensure that your property is within full compliance.


D3G is often selected to pilot new or difficult environmental reporting platforms as the “industry experts.”  Most recently, HUD selected our firm to test the HUD Environmental Review Online System (HEROS).

we offer include…

Phase I ESA

Investigations identify recognized environmental conditions (RECs) as defined by ASTM E 1527-13. 

Components of an ESA include:
  • Identification of current and historical land usage
  • Comprehensive reconnaissance
  • Review of local, state, and federal regulatory records
  • Interviews with personnel familiar with site history
  • Preliminary field screening for hazardous substances and petroleum products.

Phase II ESA

Investigations confirm the presence or absence of hazardous materials, the extent of contamination, the liability associated with contamination, and provide a basis for remediation design. 

Common Phase II activites include:
  • Soil and Groundwater Investigations
  • Vapor Intrusion/Vapor Encroachment Assessments 
  • Petroleum Storage Tank Testing
  • Lead-Based Paint Studies
  • Asbestos-Containing Material Inspections
  • Moisture and Mold Evaluations
  • Environmental Remediation
  • Geophysical Services including Ground Penetrating Radar (GPR) and Ferromagnetic Technology surveys and analysis

Asbestos, Lead Based Paint and Radon Testing.

D3G Provides various levels of materials testing from preliminary screenings to extensive rehabilitation testing.  We are experts in identifying, managing or mitigating the presence of asbestos, lead based paint or radon.

Asbestos, Lead Based Paint, and Radon testing include:
  • Lead-Based Paint (LBP) Inspections and risk assessments
  • Radon gas sampling/analysis
  • Lead-In-Water testing/analysis
  • Operations and Maintenance Plans (O&M Plans)

National Environmental Policy Act (NEPA) Compliance

D3G's experience with 24 CFR Part 50-58 and the National Environmental Policy Act (NEPA) on thousands of federally supported projects guarantees solutions to even the most complex problems. Our knowledge of Tax Credit Assistance Program (TCAP) NEPA compliance reports and HUD Form 4128 Environmental Assessment and Compliance Findings reports make our staff experts.

NEPA Compliance Includes:
  • Historical Preservation - SHPO Correspondence
  • Floodplain Management - Executive Order 11988
  • Wetlands Protection - Executive Order 11990
  • US Fish and Wildlife Service Correspondence 
  • Noise Assessments in accordance with HUD Noise Guidebook
  • Acceptable Separation Distance Evaluations
  • Coastal Zone Management Correspondence
  • Additional Nuisances and Hazards (fall zones, pipelines, etc).

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