Guidance

Release Characterization

• Release Characterization Guidance (December 2025)
• Multiple Lines of Evidence Guidance  (February 2026)
• Water Supply Well Receptor Guidance Document (Jan 2015)
• Considerations for Assessing Ecological Risks (EPA, RCRA, March 2015)
• RCRA Corrective Action Ecological Receptor Exposure Pathway Scoping Checklist (Nov 2013)
• Ecological Risk Assessment
• Environmental Cleanup Comprehensive Map Viewer - An online ArcGIS tool to view geospatial information related to environmental cleanups
• Connecticut ECO maps - Aquifer Protection Areas, Natural Diversity Database sites, soil type, surface and groundwater quality

Transition to New Programs

• Property Transfer Program Transition Information Sheet (January 2026)

Sampling and Analysis

• EPA Region 4 - Design and Installation of Monitoring Wells
• ASTM - Standard Practice for Design and Installation of Groundwater Monitoring Wells
• Use of Filters for Groundwater Sampling Technical Memorandum and Guidance (May 2012)
• EPA Low Stress (low flow) / Minimal Drawdown Groundwater Sample Collection
• Guidance for Collecting and Preserving Soil and Sediment Samples for Laboratory Determination of Volatile Organic Compounds (Feb 2006)
• Selection of Analytical Methods for Petroleum Releases (May 2026)
• Analytical Methods for Petroleum Releases
• Quality Assurance and Quality Control
  • Data Quality Assessment and Data Usability Guidance(June 2024)
  • Reasonable Confidence Protocols Guidance (March 2024)
  • Reasonable Confidence Protocols (May 2024)

Demonstrating compliance

• Release Remediation Closure Report Guide (June 2026)
• Guidance for Calculating the 95% Upper Confidence Level for Demonstrating Compliance with the Remediation Standard Regulations (May 2014)
• EPA Recommended Summary Checklist for a Superfund Monitored Natural Attenuation Evaluation for Groundwater (Feb 2025)
• Remediation Stewardship Permits
• Alternative Groundwater Protection Criteria Map (GIS)

Other considerations

• Trichloroethylene (TCE) Developmental Risks - joint guidance from DPH and DEEP (Feb 2015) 
• Emerging Contaminants
• PFAS Information for Environmental Professionals
• Polychlorinated Biphenyls
• Guidance Document For Evaluating Potential Hydrogeologic Impacts Associated With Blasting & Development Activities (December 2019)
• General Guidance on Development of Former Agricultural Properties (March 1999)
• Guidance for Utility Company Excavation (Jan 2001)
• Green Remediation

Underground Storage Tanks

• Underground Storage Tank Cleanup
• Residential Home Heating Oil Tanks