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In May 2013, the EPA released a proposed update to the current national emission standards for hazardous air pollutants (HAPs) for petroleum refineries. It requires all refineries to monitor the fenceline of their facilities for concentrations of benzene and other volatile organic compounds (VOCs).

The new rule is designed to trigger a mandatory corrective action in the event of a concentrated benzene exceedance around a fenceline of a refinery. Although benzene is the primary target compound, the sampling and analysis methodology can also be used to determine other VOCs, including 1,3-butadiene, toluene, ethylbenzene, xylenes, and other hazardous air pollutants. Implementation of this rule will result in an estimated reduction of over 1,700 tons per year of hazardous air pollutants resulting in lowered cancer risks and chronic health effects.

EPA Method 325

As part of the annual Risk and Technology Review (RTR), a combined effort to evaluate both risk and technology as required by the Clean Air Act (CAA) after the application of maximum achievable control technology (MACT) standards, the EPA is required to implement analytical methods that would be used to evaluate the risks remaining after the application of MACT standards. This RTR was officially signed by EPA Administrator Gina McCarthy and submitted for publication to the Federal Registrar on September 29th, 2015.

EPA Method 325, Volatile Organic Compounds from Fugitive and Area Sources, was created for monitoring the fencelines of refineries for benzene and includes two sub-part methods:

• EPA Method 325A: Sampler Deployment and VOC Sample Collection• EPA Method 325B: Sampler Preparation and Analysis

These complementary methods outline the design, deployment, preparation, and analysis of a series of passive sampling devices suspended around the refinery property line.

Why Choose ALS?

With more than 15,000 samples analyzed since the inception of the method, the ALS air quality laboratory in Simi Valley, California has the experience and knowledge to assist with passive sampler preparation and analysis according to the methodology outlined in EPA Method 325B. With an average of 18 years industry experience amongst our leadership, ALS is a leader in providing analytical data and support for fenceline monitoring applications.

2655 Park Center Drive, Suite A • Simi Valley, CA 93065 +1 805 526 7161

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Fenceline Monitoring