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What is an Active Exposure Pathway Mitigation Measure (AEPMM)?

As we discussed in a previous blog post, recent changes to the Massachusetts Contingency Plan (MCP) have enabled sites with an active exposure pathway mitigation measure (AEPMM) to achieve a Permanent Solution with Conditions (PSC). They can also be used with Immediate Response Actions (IRAs), Release Abatement Measures (RAMs), Temporary Solutions, and in conjunction with a Remedy Operation Status (ROS). But what exactly is an AEPMM anyway?

The term AEPMM covers any mechanical system that is used to prevent human exposure to “released” chemicals that are present at a Massachusetts Contingency Plan (MCP) site above established health risk thresholds. Most AEPMMs are sub-slab depressurization systems (SSDSs) used to address indoor air issues, but they can also be point-of-entry water treatment systems used for the treatment of private water supplies, or systems used to manage water quality in long-term discharge operations. Telemetry systems are required by the Massachusetts Department of Environmental Protection (DEP) for all AEPMMs which are installed as part of a permanent or temporary solution, or Remedy Operation Status (ROS).

Cooperstown’s expertise lies in optimizing sub-slab depressurization systems (SSDSs) to mitigate vapor intrusion, along with the use of remote telemetry. Here’s how a SSDS works to mitigate health risks related to indoor air:

Source: New Jersey Department of Environmental Protection.

Source: New Jersey Department of Environmental Protection.

Members of our staff have been intimately involved with installing both SSDSs and telemetry systems, as well as developing regulatory guidance related to this emerging technology. Through our experience, we’ve learned that there are many complicated considerations that need to be taken into account when considering one as a solution at a site, from the perspectives of both the property owner and the LSP. We will talk about what LSPs and property owners need to know about AEPMMs in future articles.

As AEPMMs and regulations surrounding the technology continue to evolve, Cooperstown will remain on the forefront of this exciting topic.

Cooperstown Environmental LLC is a leading expert in the analysis of site contamination and design, implementation, and operation of SSD systems. Our employees have significant, real-world experience; serve in leadership positions in the professional industry groups, and consult with the MassDEP and other industry colleagues on the latest practices. Cooperstown’s subject matter expert is Isaac Anderson, an acknowledged authority in the field who has provided numerous presentations to explain various aspects of AEPMMs and Telemetry.


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