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Fenceline/Perimeter Air Quality Monitoring

Analytical + Environmental / Air / Fenceline Monitoring
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Fenceline/Perimeter Air Quality Monitoring

Fenceline, also called perimeter or boundary monitoring, is the use of monitoring technology to measure air emissions for specific pollutants along the perimeter of a facility. This type of monitoring is used to control fugitive emissions in areas where volatile chemicals, particulates, or aerosols may travel off-site into a neighborhood. Today, a wide range of entities, including oil refineries, mining, petrochemical plants, agriculture, construction, landfills, Manufactured Gas Plants (MGP), ports, and superfund cleanup sites, are looking more closely at the air quality on and around the perimeters of their operational sites. Through its fenceline/perimeter air quality monitoring services, Pace® helps customers:

  • Protect human health, particularly if close to population bases
  • Enhance worker health and safety
  • Show compliance with a permit or consent order
  • Establish a baseline
  • Understand and manage potential pollution sources
  • Respond rapidly in critical situations
  • Promote Environmental, Social and Governance (ESG) goals

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Fenceline Monitoring For Oil Refineries And Petrochemical Plants

Oil refineries and petrochemical plants that fall under the Petroleum Refinery Sector are required to monitor air emissions at their property fenceline. The fenceline emission monitoring requirement is based on U.S. Environmental Protection Agency (EPA) rules that became effective in 2016.

The EPA and state regulatory agencies specify two test methods for fenceline monitoring. EPA Method 325A details field protocols for the deployment of passive tube samplers. EPA Method 325B describes the laboratory analysis of the sample tubes using thermal desorption GC/MS. Benzene is the representative compound used to measure overall emissions from refineries in the United States. Oil refineries and petrochemical plants are required to monitor for benzene continuously over a 14-day period at fenceline locations.

Pace® has analyzed thousands of samples for oil refineries, petrochemical plants, and manufacturing companies to support their fenceline monitoring requirements.

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Perimeter Monitoring

Perimeter and meteorological monitoring programs are often implemented at hazardous waste, landfill, dredging, ports, and MGP remediation sites. At its core, a monitoring program protects human health and the environment and enhances worker health and safety.
Perimeter air monitoring can be used to detect and mitigate nuisance dust and toxic contaminants emitted during remedial works. Pollutants measured at the perimeter may include:

Designing A Perimeter Monitoring Program

When designing a perimeter monitoring program, it is important to define the overall program objectives and identify any specific requirements. This helps ensure the program is technically defensible and cost-effective. In collaboration with our customers, Pace® can examine the options to determine the most appropriate methods and develop a comprehensive perimeter monitoring strategy. A formal monitoring plan should include:

  • Monitoring objectives
  • Monitoring site locations
  • Monitoring protocols and frequency of sampling
  • Instrumentation
  • Action limits for the various parameters
  • Routine operational procedures
  • Data retrieval options
  • Data reporting formats and frequency
  • Monitoring system calibration
  • Quality control/assurance protocols
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Industry Perimeter Air Monitoring Applications

When designing a perimeter monitoring program, it is important to define the overall program objectives and identify any specific requirements. This helps ensure the program is technically defensible and cost-effective. In collaboration with our customers, Pace® can examine the options to determine the most appropriate methods and develop a comprehensive perimeter monitoring strategy. A formal monitoring plan should include:

Construction Site Perimeter Air Monitoring

Construction sites vary significantly, from the demolition of condemned buildings to the remediation of Superfund and Brownfield sites. To comply with the regulations and standards issued by local (state) and federal agencies, airborne contaminants produced by the site and/or process may need to be monitored.

Mining Site Perimeter Air Monitoring

Both surface and underground mining produce many different types of particulate matter—some of which can be harmful to human health and the environment. Particulate size is the most important characteristic for health risk classification, as size determines where the particle may be deposited in the lungs. The smaller the particle, the deeper into the lungs it can travel. Monitoring dust concentration from mining operations can help ensure the protection of mine employees and the surrounding communities.

Remediation Perimeter Air Monitoring

Remediation activities can disturb contaminants that are normally immobile in soil and transfer them to air. The resulting increase in airborne concentrations of contaminants, even if temporary, may be a health concern for individuals in neighboring residences or businesses. A regulatory agency may require perimeter air monitoring to determine if unhealthy conditions are created and if work practices need to be limited or modified.

Additional Resources

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