Connecticut Department of Energy and Environmental Protection

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Engineered Control Variances 

Engineered Control Guidance Document

(Effective April 1, 2009) The February 2009 (Revised November 2010, January 2013) Engineered Control Guidance Document (ECGD) has been developed by the Connecticut Department of Energy & Environmental Protection, Bureau of Water Protection and Land Reuse, Remediation Division (DEEP), with support from the Environmental Professionals’ Organization of Connecticut (EPOC).

An Engineered Control is a permanent physical structure designed to safely isolate pollutants which would otherwise not comply with the self-implementing remedial options allowed in the Connecticut Remediation Standard Regulations (RSRs). The ECGD includes a description of what is eligible to be considered as an Engineered Control under section 22a-133k-2(f)(2) of the RSRs, a description of the information necessary for the preparation of complete and approvable applications, a step-by-step outline of the review and approval process, and supplemental resources provided in the appendices.

Engineered Control Guidance Document 

Please note: Many Engineered Controls include the maintenance of pavement.  The CT Department of Public Health (DPH) recommends against the application of coal tar-based road sealants because they can increase human exposure to carcinogenic polycyclic aromatic hydrocarbons (PAHs). As an alternative, CT DPH recommends an asphalt based sealant, which is low in PAHs.  

DPH EHS Circular Letter #2016-49 Important Reminder Regarding Coal Tar Sealants for Road Repair

Examples of Engineered Controls

Below is a link to the initial version of the Engineered Control Database that is mentioned in the Engineered Control Guidance Document. Records within the database are a work in progress and will be updated from time to time. The database requires Microsoft Access 2007 or later to open.
 
This database provides a partial list of engineered controls (under section 22a-133k-2(f)(2) of the RSRs) that have been approved by the Remediation Division in the past. It will provide stakeholders with examples of ECs previously approved, including information regarding ECs’ nature and design characteristics and the classes of contaminants being addressed under the EC.  Information in this database is provided as a convenience; more complete information is available in the DEEP public file room.  Environmental professionals should review appropriate site-specific information regarding those previous approvals and reference such information in the application to promote consistency and efficiency.  The information in this database is intended for general information only and is not to be relied upon as a guarantee of the likelihood for future approval.
 
Please direct any questions or comments regarding the engineered control database to Claire Quinn of the Remediation Division. 

Examples of Engineered Controls (zip Access) rev. 3-5-13
 

Engineered Control Variance Forms

All four forms must be submitted to have a complete Engineered Control Variance application.  Typically the Part 2 application is submitted and the public notice is performed, following DEEP concurrence that the conceptual approach presented in the Part 1 application is appropriate.
 
The Electronic Document Transmittal Form must be the cover page for Part 1 and Part 2 of the EC Application and the Public Notice Confirmation Form. 
 
There are two parts to the Engineered Control Application. Part 1 of the Application presents the conceptual EC and supporting information. Part 2 of the Application presents the detailed engineering design, implementation schedule, operation and maintenance plan, and financial assurance.
Pursuant to section 22a-133k-2(f)(2)(A)(iv) of the RSRs, confirmation of public notice of the final Engineered Control design is required prior to formal approval. 

Engineered Control Financial Assurance Tools

If you have any questions related to Engineered Controls, please call the Remediation Division at (860) 424-3705.

Connecticut Remediation Standard Regulations

Content Last Updated October 28, 2021