Open Emissions Monitoring: The Importance of Fenceline Surveillance

Fenceline monitoring, a work practice standard published by the United States Environmental Protection Agency, measures ambient air concentrations at manufacturing site perimeters for specific chemicals. This transparent evaluation method provides an open and effective assessment of emissions monitoring and control.

What is fenceline monitoring?

Fenceline monitoring is the use of monitoring technology to measure the ambient air concentration at the property line or perimeter of a manufacturing site for a specific chemical, providing an accurate and transparent evaluation of a site's emissions.

What types of sensors are used for fenceline surveillance?

Fenceline surveillance typically employs ultrasonic anemometers and sonic anemometers to measure wind speed and direction at the boundary between a site and its surroundings. These sensors provide accurate and reliable data on air movement, which is crucial in monitoring and controlling emissions near sensitive receptors. Additionally, infrared cameras and gas sensors are also commonly used to detect and quantify emissions from sources such as stack gases or fugitive emissions along the fenceline.

How often is data collected from emissions monitoring systems?

Data collection frequency from emissions monitoring systems is typically performed on an ongoing basis, with some systems capable of transmitting real-time data to monitoring centers or control rooms for prompt analysis and response.

Can open emissions monitoring systems detect specific pollutants?

Open emissions monitoring systems can effectively detect specific pollutants through the use of advanced sensing technologies and sophisticated data analysis techniques. By leveraging cutting-edge equipment and software, these systems can accurately identify and quantify a wide range of pollutants, including particulate matter, volatile organic compounds, and hazardous air pollutants.

What kind of training is required to operate an emissions monitoring system?

To operate an emissions monitoring system effectively, personnel require comprehensive training on the principles of emissions monitoring, the specific technology used in the system, and the procedures for collecting and analyzing data. This training should include hands-on experience with the equipment, as well as instruction on how to identify and troubleshoot common issues that may arise during operation.

How do open emissions monitoring systems compare to traditional methods in terms of cost and effectiveness?

Open emissions monitoring systems have been shown to be more effective than traditional methods at detecting and controlling emissions, particularly for sites with complex emission profiles. In terms of cost, while initial investments may be higher for open emissions monitoring systems, they often provide long-term cost savings through reduced maintenance needs, increased accuracy, and improved compliance with regulations, making them a more cost-effective option in the long run.

Can open emissions monitoring systems be integrated with existing data collection tools?

Yes, open emissions monitoring systems can be seamlessly integrated with existing data collection tools, enabling real-time tracking of site emissions and facilitating effective control methods.

How do air samples get collected?

Air samples are collected by placing tubes filled with sorbent material around the fenceline of the facility at a height of 5 to 10 feet above grade and leaving them uncapped to expose them to air.

How long do the tubes remain exposed to air before being recapped?

The tubes remain exposed to air for two weeks before being recapped.

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