On May 16, 2024, the EPA published its "New Source Performance Standards for the Synthetic Organic Chemical Manufacturing Industry and National Emission Standards for Hazardous Air Pollutants for the Synthetic Organic Chemical Manufacturing Industry and Group I & II Polymers and Resins Industry" rule. Facilities impacted by the rule are required to implement fenceline monitoring for pollutants like benzene, 1,3-butadiene, chloroprene, ethylene dichloride, ethylene oxide (EtO), and vinyl chloride.

Achieving and maintaining compliance with these evolving regulations can be complex and cost-intensive, requiring a strategic approach that balances business objectives with regulatory requirements. Leveraging our extensive experience from the 2018 Refinery Sector Rule, Trihydro's comprehensive fenceline monitoring services, software and programs are designed to help you navigate this challenge efficiently and effectively. From program implementation and monitoring to data management and reporting, our air compliance experts are ready to guide you through every step.

Our Fenceline Monitoring Services

  • appPilot Study Preparation
  • capture and editSample Station Siting
  • ldar tag scanningCompliance Manual Development
  • equipment verificationField Data Collection
  • workflow-autoStreamlined Laboratory Coordination
  • role based workflowsData Management Solutions
  • data-manRoot Cause Analysis and Corrective Action Implementation

Pilot Study Preparation

With fenceline monitoring required to begin by July 15, 2026, Trihydro helps facilities conduct pilot studies to assess site conditions. These studies aim to identify potential sources and implement corrective actions before data is made public through EPA's required quarterly CEDRI reporting.

Sample Station Siting

Trihydro aids in establishing fenceline monitoring networks per EPA Method 325A. Regardless of facility layout, our experienced team designs and implements networks meeting regulatory requirements. Our expertise ensures optimal data collection, even in diverse layouts with geographically complex elements.

Compliance Manual Development

We assist our clients by preparing compliance manuals that document the basis for sample station siting and provide step-by-step procedures for sample collection, handling, and reporting. This approach streamlines operations, improves data quality, simplifies compliance reporting, and reduces non-compliance risks.

Field Data Collection

Successful field data collection relies on a rigorous protocol, including consistent sampling procedures following the designated route, and one tube at a time sampling. Our experienced technicians, well-versed in meticulous and consistent collection protocols, are prepared to implement the monitoring procedures outlined in the new HON rule.

Streamlined Laboratory Coordination

Leveraging established relationships with laboratories nationwide, we ensure efficient sample handling and analysis. This minimizes delays, whether we contract directly with the lab or facilitate client-lab communication.

Data Management Solutions

Utilizing Fenceline ProTM, we seamlessly set up new programs or integrate existing data. This end-to-end compliance and data management tool helps reduce the amount of time that our clients spend managing the data and preparing reports for their fenceline monitoring program.

Root Cause Analysis and Corrective Action Implementation

Our success in identifying and mitigating emission sources extends to the new HON rule. Utilizing investigative techniques, such as additional sampling, optical imaging, and real-time monitoring equipment, we can pinpoint emission sources for targeted corrective action, reducing emissions and ensuring compliance.

Our Fenceline Monitoring Software

Leveraging decades of regulatory experience, Trihydro developed Fenceline Pro to tackle the complexities of fenceline monitoring with a comprehensive software solution. This user-friendly platform empowers facility personnel to accurately and efficiently collect, monitor, and report fenceline monitoring data, ensuring compliance with EPA Clean Air Act regulations.


Trihydro's staff is always prompt and professional in meeting our reporting and operational needs. The level of technical expertise and knowledge of the regulations is impressive. Our air compliance program is in great shape thanks to the good folks at Trihydro.

Randy Verret, Regulatory & Environmental Manager Baytex Energy, USA

Platform Features

  • equipment verification   Comprehensive Data Management
  • equipment verification Custom Searches
  • alerts Interactive Maps
  • ogi Streamlined Reporting
  • data-man Customizable Dashboards

EnFlection helps manage project workflow and regulatory expectations by enabling facility personnel to:

  • Facilitate seamless data management for single project sites or an entire CSS project portfolio.
  • Manage data related to CO2 streams, injection well operations, groundwater, site characterization, atmosphere and soil gas, permit conditions/statistical thresholds, and regulatory standards/exceedances.
  • Collect and access reporting data for CSS injection well and pipeline operations, well logging, and seismic survey summaries.
  • Save and segment data searches by any combination of filters and fields and compare them to regulatory standards or custom limits.
  • Generate automated tables, figures, and analyses tailored to specific regulatory programs.
  • Export and readily integrate data into the EPA Geologic Sequestration Data Tool (GSDT) or other relevant regulatory programs.
  • Gain valuable insights with customizable dashboards that provide real-time data visualization and analysis.
  • Tailor dashboards to your specific needs and effectively track key performance indicators (KPIs).


Refinery Tablet Data Collection

Fenceline Monitoring Compliance: Overcoming 9 Challenges in Data Collection and Management

As the EPA HON rule deadline for proposed requirements rapidly approaches, let's dive into the challenges that facilities commonly encounter in fenceline monitoring data collection and management.

EPA’s Fenceline Monitoring Requirements for Synthetic Organic Chemical Manufacturing Industry (SOCMI) and Group I and II Polymers and Resins Industries

On May 16, 2024, the United States Environmental Protection Agency (EPA) published a final rule that regulates emissions and establishes new emission control requirements

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Fenceline Pro: A Solution to Fenceline Monitoring of Fugitive Emissions

To help refineries comply with Environmental Protection Agency (EPA) fenceline monitoring rules, Trihydro developed Fenceline ProTM, a proactive and secure software solution that allows refinery personnel to accurately and efficiently collect and monitor benzene data at the fenceline.

LDAR Program Development

Trihydro assisted a large petrochemical manufacturing facility with its regulatory compliance efforts by developing a system to track organic hazardous air pollutant determinations for more than 1,500 transmission lines and 900 pieces of equipment.