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)

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Ready to Discuss Your Project?

Whether you need an ESA or due diligence regarding Part 50 or Part 58, our team of experts are here to help!


Team & Timing

Our experienced Property Needs Inspectors and Environmental Project Managers work closely to create a smooth client experience. A quick response to additional testing, such as NEPA, HAZMAT, PHASE II, and Radon and Asbestos services, is essential to satisfy deadlines that keep your deal moving forward.


Our subject matter experts (SMEs) comprise our environmental management team. The team often finds new opportunities to create efficiencies to coincide with HUD’s platforms and other environmental programs, such as HUD HEROS. With experience in all US regions, D3G is often selected to pilot new and challenging environmental platforms.

Data & Research

As environmental initiatives become more prevalent in multifamily and affordable housing, our team remains on the cutting edge of trends and upcoming regulatory changes. Paying attention to these developments allows us to better serve our clients with records, site reconnaissance, interviews, and written reports services. With access to data from over 20,000 site assessments, we can use technical blueprints to navigate any environmental concern.

We Offer Include…

Phase I ESA

Investigations identify recognized environmental conditions (RECs) as defined by ASTM E 1527-21. 

Read our blog on ESA's:

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. 

Read our latest Q&A with Phase II expert Ron James:

Common Phase II activites include:
  • Soil and Groundwater Investigations
  • Vapor Intrusion/Vapor Encroachment Assessments 
  • Petroleum Storage Tank Testing
  • 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

We provide various levels of materials testing, from preliminary screenings to extensive rehabilitation testing.  We are experts in identifying, managing, and 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

Our experience with 24 CFR Part 50-58 and the National Environmental Policy Act (NEPA) on thousands of federally supported projects guarantee solutions to even the most complex problems. Our team is well-versed in the Tax Credit Assistance Program (TCAP) NEPA compliance reports and HUD HEROS Environmental Assessment and Compliance Findings reports.

NEPA Compliance Includes:
  • Historical Preservation - Section 106 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.)

Environmental Services Team:


Keith Bayer
Vice President of Environmental Services, Environmental Professional

Ron J

Ron James
Director of Technical Environmental Services, Professional Geologist

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Stephen Evanko has been named a Home Innovation NGBS Green Partner of Excellence for 2023. NGBS Green, which is based on the ICC-700 National Green Building Standard® (NGBS), has certified more homes than any other national green home certification program. Having now surpassed 500,000 NGBS Green Certified homes, the program is grateful for the momentum that our dedicated verifier partners have seeded and continue to nurture through their expert guidance to their clients.