Connecticut Department of Energy & Environmental Protection

DEEP headquarters at 79 Elm Street in Hartford is currently closed due to recent water damage impacting multiple areas of the building. We are working to remediate the situation and get the building back open to staff and the public as soon as possible. While the building is closed, Staff continue to work either remotely or in alternate locations. We continue to be able to receive documents via U.S. Mail or courier service, and our electronic file submittal protocols remain unchanged. For updates, please click here

Site Characterization Essentials

The following resources help to define the standard of care expected when characterizing a site under various clean-up programs in Connecticut.  For instance, the Connecticut Property Transfer Act requires an investigation in accordance with prevailing standards and guidelines.  DEEP's expectations are set forth in the Site Characterization Guidance Document
 

Assessing Sensitive Receptors

Sampling and Analysis

Other Considerations

Underground Storage Tanks and Petroleum Releases

Vapor Intrusion

EPA's Vapor Intrusion website contains basic information about vapor intrusion, technical and policy documents, tools and other resources to support vapor intrusion investigations. It also provides access to technical reports focused on topics such as conceptual model scenarios for the vapor intrusion pathway and mitigation approaches for vapor intrusion.

Completion of Investigation

Demonstrating Compliance

Further guidance for using variances to demonstrate compliance with the RSRs can be found on the Remediation Standards Regulations page.
Content last updated July 31, 2025