Benzene and VOC Monitoring with EPA Methods 325A abd 325B
EPA Method 325 is required for petroleum refineries to monitor benzene and other volatile organic compounds using passive sampling every 14 days.
Fenceline monitoring services for EPA compliance and risk mitigation
Are you prepared to meet EPA fenceline monitoring requirements?
Eurofins Environment Testing offers comprehensive fenceline monitoring solutions designed to help refineries and chemical manufacturing facilities stay compliant with the latest NESHAP rules, including the Refinery Sector Rule and the 2024 updates to the HON Rule.
Our expert team supports your compliance goals with accurate data, fast turnaround, and regulatory insight. Whether you're launching a new program or scaling an existing one, we provide everything you need to monitor, report, and respond with confidence.
Comply with key EPA regulations
Our services are aligned with critical air compliance standards, including:
- EPA Method 325A/325B for passive benzene and VOC monitoring
- EPA Method 327 for ethylene oxide and vinyl chloride monitoring
- Reporting requirements under 40 CFR Part 63
We deliver scalable, reliable solutions to help you meet both regulatory deadlines and internal performance objectives.
What you need to know
- Passive sorbent tubes are deployed along the facility perimeter
- Samples are collected biweekly and analyzed by TD-GC/MS
- A Delta C (ΔC) value must be calculated for each period
- Exceeding the action limit requires root cause analysis and corrective action
Common VOCs monitored
- Benzene
- Toluene
- Ethylbenzene
- Xylenes
- 1,3-Butadiene
- Styrene
- Hexane
- Ethylene dichloride
How Eurofins Environment Testing supports your compliance
- 5-business day standard turnaround time
- High-volume laboratory capacity
- Method-compliant field kits prepared in advance
- Compatible data formats including EQuIS, TubeTrack, and Fenceline Pro
- Expert consulting for tube selection and data interpretation
Ethylene Oxide and Vinyl Chloride Monitoring with EPA Method 327
EPA Method 327 is now required under the 2024 updates to the HON NESHAP rule. This method mandates canister-based fenceline monitoring for ethylene oxide and vinyl chloride, both highly toxic and heavily scrutinized by regulators and communities.
Method 327 requirements
- 6-liter canister samples collected over 24 hours
- Sampling occurs every 5 days at eight perimeter locations
- Laboratory analysis includes cryogenic preconcentration and GC-MS
- Detection limits as low as 20 pptv
- Data must be submitted for ongoing compliance under 40 CFR Part 63
Our Method 327 capabilities
- Ready-to-deploy certified canisters and flow controllers
- Validated TO-15 SIM analysis for ultra-trace detection
- Standard and expedited turnaround options
- Robust QA/QC program with field spikes, duplicates, and blanks
Why facilities nationwide choose Eurofins Environment Testing
Nationwide coverage with consistent service delivery.
Fast, accurate, and defensible data.
Scalable solutions to support single-site or multi-site programs.
Expert support for setup, deployment, troubleshooting, and reporting.
Customizable EDDs that integrate seamlessly with your data systems.
Start your testing now
Contact us to discuss your project goals and learn how our testing solutions can support your data and regulatory needs.