The Release Report #7: Oversight Tiers

This is the seventh in a series of blog posts discussing key features of Connecticut’s new release-based cleanup regulations (the “RBCRs”), R.C.S.A. § 22a-134tt-1 et seq. 

Under the Transfer Act, the majority of site remediation efforts are led by licensed environmental professionals (LEPs).  For a minority of sites with especially serious contamination, remediation efforts are subject to direct oversight by the Department of Energy and Environmental Protection (DEEP).  This same basic framework continues under the RBCRs, with the majority of release remediation efforts led by LEPs. This post discusses how different releases are assigned to different “tiers” of oversight, and the impact of such tier assignment.

Some releases discovered and addressed under the RBCRs will be resolved in less than one year. For certain new releases and especially serious existing releases (called “significant existing releases” in the RBCRs) immediate actions are required as discussed in a prior post, and these immediate actions may be enough to completely resolve the release. Other releases will be closed within a year, even if not required, thanks to a straightforward remedial approach. 

If a release has not been closed within one year after occurrence or discovery, the RBCRs provide that it must be assigned to an oversight “tier” based on the risks posed by the release. This applies to both existing releases and new releases. As discussed below, the tier to which a release is assigned controls the oversight, deadlines, and fees associated with a release.

Tiers

In order to assign a release to a tier, an LEP must complete the Tier Checklist Form provided in the appendix to the RBCRs. This Tier Checklist Form must be completed within one year after the occurrence or discovery of the release. Tiers are assigned as follows:

• Tier 1A: Releases that pose the highest risk and/or are poorly understood. If tier characterization (discussed in the last post) has not been completed, or if required immediate actions have not been completed, then the release is assigned to Tier 1A. Releases are also assigned to Tier 1A if receptors are not known and documented through completion of a scoping level ecological risk assessment, a drinking water receptor survey, and a vapor intrusion survey.
• Tier 1B: Releases that are better understood than Tier 1A but still higher risk than other releases. These include releases that involve a groundwater plume migrating off the source parcel, releases for which a vapor intrusion pathway is present, and releases for which a drinking water receptor pathway is present. Even if none of the above conditions is true, a release is categorized as Tier 1B until a remedial action plan has been prepared.
• Tier 2: Releases that pose a lower degree of risk than Tiers 1A and 1B but for which additional remediation is required. For example, Tier 2 releases are those that do not fall within Tiers 1A and 1B but still require soil remediation or the elimination of exposure pathways.
• Tier 3: Releases for which groundwater is being addressed through monitored natural attenuation and no additional active work is required.

Impact of Tier Assignment

Releases assigned to Tiers 1B through 3 will be managed by an LEP much the way the majority of Transfer Act remediation projects are managed now. Tier 1A releases will be subject to direct oversight by DEEP, like a relatively small proportion of Transfer Act sites today require DEEP to approve the remediation.

Different tiers of releases are subject to differing fees.

As set forth in the RBCRs, the annual fee increases by 10% of the base fee amount for every year that has passed since initial tier assignment (i.e., when the Tier Checklist Form is submitted for the first time). In other words, a Tier 3 release would be subject to an annual fee of $70 four years after tier assignment.

Different tiers are also subject to different deadlines:

• Tier 1A: Within one year after initial tier assignment, Tier 1A releases must either be closed or assigned to a lower-risk tier (i.e., Tiers 1B, 2 or 3).
• Tier 1B: Within two years after initial tier assignment, Tier 1B releases must either be closed or assigned to a lower-risk tier.
• Tier 2: Within four years after initial tier assignment, Tier 2 releases must either be closed or assigned to Tier 3.
• Tier 3: Must be closed within five years after initial tier assignment.

The RBCRs provide that single one-year extensions may be requested for releases in Tiers 1A, 1B and 2. For Tier 3 releases, five-year extensions may be requested and approved as long as the groundwater plume remains in a diminishing state that is naturally attenuating consistent with the conceptual site model.

In our next posts, we will discuss remediation standards and closure documentation.