When a stack operates at very low flow rates, differential pressure often falls below the readable range of standard EPA instruments. Emissions still need to be measured, but conventional methods lose accuracy under these conditions, creating risk for both data integrity and regulatory compliance.  This scenario is increasingly common as facilities optimize processes, reduce throughput, or cycle equipment. Low-flow conditions challenge even experienced emissions professionals and demand advanced technical evaluation.  This article outlines the key issues that arise during low flow emissions testing and the alternative methods available to address them.  What Happens When the Stack or Duct Flow Falls Below EPA Thresholds   Under EPA reference methods, most flow measurements require a minimum differential pressure of 0.05 inches of water column . When the flow is too low to meet this threshold:  A standard inclined manometer becomes unstable or unreadable .  Small pressure fluctuations appear as noise rather than measurable signal.  Temperature and gas composition variations increase uncertainty.  Some flow devices lose calibration accuracy in low-velocity conditions  Compounding this, low-flow sources can present additional complications such as:  Elevated or fluctuating temperatures  Gas streams with non-air composition  Particulate loading that interferes with sensors  Restrictions that can cause unacceptable back-pressure to the process  In these environments, conventional measurement techniques are insufficient , and a more tailored engineering approach is required.  Alternative Measurement Methods for Low Flow Emissions Testing   When low flow prevents the use of standard EPA methodology, technical teams must evaluate alternative strategies. A structured solution framework typically includes:  1. Instrument Sensitivity Adjustment   Upgrading to a lower-range or digital manometer with higher resolution can resolve many borderline low-flow scenarios.  2. Technology Assessment for Alternative Flow Devices  Depending on gas characteristics and source configuration, several devices may be considered:  Vane anemometers  for moderate-temperature, clean gas streams  Hot-wire anemometers  for low-velocity, low-particulate environments  Critical orifice systems  where predictable flow control is possible  Direct plumbing to dry gas meters  when stable volumetric measurement is feasible  Tracer gas injection techniques  for complex or i naccessible stacks  3. Engineering Calculations Using Plant Data  If reliable fuel flow, fuel composition, and combustion efficiency data are available, EPA methodologies allow deriving stack flow via calculation rather than direct measurement.  4. Mechanical or System Modifications (When Necessary)  Some cases require temporary or permanent adjustments, such as:  Installation of an in-line dry gas meter  Construction of a temporary test stack  Additional sampling personnel and instrumentation for tracer-based methods  Each option must be evaluated for compatibility, safety, impact on the process, and regulatory acceptance. Quick Answer: How do you accurately measure emissions when a source operates at extremely low flow rates? Our teams address low-flow conditions through four approaches: upgrading to digital manometers with higher resolution, deploying alternative devices like vane anemometers or tracer gas systems, using engineering calculations based on fuel data, or modifying the sampling system. Method selection depends on gas temperature, particulate loading, and regulatory requirements. Proper planning avoids the $10,000-$40,000+ costs associated with failed testing and remobilization.  Before the Test: Validation and Verification Steps Implementing the selected strategy requires detailed technical planning:  Instrument compatibility checks  (temperature ranges, gas composition, particulate resistance)  Sensitivity and accuracy verification  against the required test method  Assessment of system back-pressure implications  before deploying any device that restricts flow  Calibration traceability  to ensure EPA compliance  Field validation  under actual operating conditions before beginning regulated testing  Experienced emissions professionals must balance measurement feasibility, cost, and regulatory requirements to avoid invalidating test results.       What Proper Low-Flow Measurement Delivers  A properly engineered low-flow measurement strategy yields:  Accurate and defensible flow data  suitable for EPA reference methods- avoiding the 2-4 week retesting delays and $10,000-$40,000+ remobilization costs that result from invalid data.  Reduced uncertainty  in emission rate calculations - preventing significant errors like the 20%+ velocity increase that results from misreading 0.02 delta P as 0.03, which invalidates test results and requires costly retesting.  Minimized operational impact  to the facility -   solutions beyond stack modifications or fabricating spool pieces can be evaluated with your technical team, avoiding facility shutdowns or process modifications that can cost $10,000 - $50,000+ per day in lost production.  Compliance confidence  during audits, reviews, and regulatory submissions – eliminating the risk of failed demonstrations that trigger enforcement actions, penalty assessments, or permit delays    By selecting the right combination of instrumentation and methodology, even difficult low-flow sources can be measured reliably.    Alliance TA Team: Expertise for Complex Emissions Testing  Low-flow conditions present some of the most technically challenging scenarios in emissions testing. They require specialized knowledge, careful technology selection, and a deep understanding of both equipment limitations and EPA methodology.  Alliance’s Technical Advisory (TA) Team , led by Glen Capra , has the expertise to analyze these situations, recommend the most effective measurement techniques, and guide field teams and clients through implementation. Our specialists evaluate each source on a case-by-case basis to ensure accurate, compliant, and cost-effective results.  If you are facing low-flow measurement challenges—or want to proactively plan for them—reach out to Alliance’s TA Team for expert guidance and customized technical solutions.  Glen Capra Technical Advisor Manager glen.capra@alliancetg.com

Stack testing isn’t just about capturing emissions; it’s about interpreting them correctly. Understanding how detection limits affect results can help your facility avoid costly surprises. When planning a stack test, one of the most common concerns from both new and existing source owners/operators is: What if the emission levels of a regulated pollutant are extremely low—possibly even below detectable limits? How will a “non-detect” (ND) result impact the emission unit’s compliance status with the permitted emission limits? These are valid questions. They underscore why understanding and evaluating non-detects (NDs), Method Detection Limits (MDLs), and In-Stack Detection Limits (ISDLs) before scheduling a stack test is critical. What is a Method Detection Limit? A Method Detection Limit (MDL) is defined as the minimum concentration of a substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero. It is determined through a specific analytical procedure using a sample matrix containing the target analyte. Per EPA guidance, if a pollutant is not detected during testing, the result should be reported as the method’s MDL. To accurately report an MDL for a given pollutant or test method, the testing team or analytical laboratory must conduct an MDL study as defined by the Environmental Protection Agency (EPA). Learn more about EPA testing procedures. MDL vs. ISDL – What’s the Difference? It’s important to distinguish between the analytical MDL and the in-stack detection limit (ISDL): The analytical MDL is determined by the laboratory analyzing the collected samples. It reflects the sensitivity of the lab’s instrumentation and methodology. The ISDL, on the other hand, is tied to the actual sampling process in the field. It can be influenced and adjusted by modifying stack sampling parameters—such as increasing the sample volume by extending the sampling duration. For wet chemistry methods that rely on laboratory analysis, both MDL and ISDL are critical to ensure a test result is meaningful and valid. The Impact on Emissions Compliance Failing to account for MDLs and ISDLs can result in: Invalid test results: Making your test data unusable for permit demonstrations. Compliance uncertainty: When non-detect results are reported above your permitted limits, regulatory agencies may assume worst-case scenarios. For example, if your permit limit is 0.001 ppm but the lab reports "< 0.003 ppm ND," you may be considered out of compliance even if actual emissions are negligible. Costly retests: A failed stack test due to incorrect detection limits can cost $10,000-$50,000+ to repeat, not including production downtime and expedited lab fees. Proper planning prevents these expensive do-overs. Regulatory scrutiny: This can result in issued violations and required corrective action plans. How Alliance Technical Group Can Help At Alliance Technical Group, our Technical Advisors are subject matter experts who carefully evaluate all critical elements before any test program is scheduled. Some of the key considerations we focus on include: Evaluating permitted emission limits Selecting the appropriate stack test method Assessing how ND, MDL, and ISDL values will affect the integrity and outcome of your test program If you’re unsure how a non-detect result might impact your compliance status or stack test results, reach out to our experts directly. Our team is here to guide you through the process and ensure you’re making informed, compliant decisions. Understanding Detection Limits in Depth Detection limits play a crucial role in environmental compliance. They help determine whether emissions are within acceptable levels. Understanding these limits can prevent regulatory issues and financial losses. The Importance of Accurate Testing Accurate testing is essential for compliance. It ensures that emissions are monitored correctly. This helps facilities avoid penalties and maintain their operational licenses. Common Misconceptions About Detection Limits Many people misunderstand detection limits. They may think that a non-detect result means no emissions. However, this is not always the case. It is vital to interpret these results correctly. Best Practices for Stack Testing To ensure accurate results, follow best practices for stack testing. This includes: Properly calibrating equipment Following standardized testing procedures Training personnel on testing methods Conclusion In conclusion, understanding detection limits is vital for compliance. It helps facilities avoid costly mistakes. By working with experts, you can ensure that your stack testing is accurate and reliable.

In the complex world of environmental regulations, staying ahead of the curve is critical. On May 8, 2024, the U.S. Environmental Protection Agency (USEPA) finalized amendments to rules that will significantly impact compliance requirements for the gasoline distribution and terminals industry. These updates, aimed at reducing emissions and enhancing environmental stewardship, present new challenges that will be multi-faceted. What to Know First About the 3 Revised Rules Effective July 8, 2024, these three finalized USEPA rule amendments apply to bulk gasoline  terminals, distribution facilities, and pipeline facilities: 40 CFR Part 60, Subpart XXa:  New Source Performance Standards (NSPS) for bulk gasoline terminals. 40 CFR Part 63, Subpart R:  National Emissions Standards for Hazardous Air Pollutants (NESHAP) for gasoline distribution facilities (major sources). 40 CFR Part 63, Subpart BBBBBB:  NESHAP for gasoline distribution bulk terminals, bulk plants, and pipeline facilities (area sources). Compliance deadlines for existing facilities extend to May 8, 2027, but proactive planning is essential. Stay Ahead of the Compliance Curve with Confidence Taking proactive steps now to evaluate, plan and execute any needed modifications to your facility or compliance programs is the best strategy to ensure you can demonstrate compliance for every affected source. Consider that over 9,000 sources across the U.S. are also affected, so waiting too long is risky. The supply-chain of equipment and resources, including expert testers, labs, and consultants cannot meet the demand at one time. Quick Glance of Significant Revisions Lower VOC emission limits for new, modified, or reconstructed bulk gasoline terminals Reduced loading rack emission limits Increased cargo tank vapor-tightness requirements Additional controls for storage tanks Enhanced leak detection and repair requirements Revised monitoring and operating requirements for control devices You may end up needing new controls, performance evaluations, new installs/upgrades, or programming changes for your CEMS, or just finding the best LDAR technicians in your area. Stay tuned, as my team and I from Alliance will be sharing specific details about each updated gasoline rule requirement, and how we can help to ensure you’re meeting your compliance obligations. Read our latest update regarding Appendix K requirements, reshaping bulk gasoline terminals' LDAR programs. → About the Author Kristine Davies, Project Director, Air Quality, Environmental Consulting With nearly 20 years of expertise in environmental consulting, complemented by a decade of experience in manufacturing and environmental engineering, Kristine excels in air quality permitting and compliance, specializing in Title V, PSD, NNSR, and minor source permitting. She is proficient in NSPS, NESHAPs, RACT regulations, emissions quantification, and emissions inventory submittals, making her a versatile leader in the field. Discover All That Is Alliance  As your strategic partner in environmental testing, monitoring, and analysis, we have a full suite of technical and compliance services for all your environmental needs.  Analytical & Environmental Lab Services | Stack Testing | Temp CEMS | CEMS | LDAR | Ambient Air | Engine Testing & Emissions Solutions | Software & Technology | Environmental Consulting Services: Air & Water Quality, Natural Resource Management Contact Alliance for end-to-end solutions that support your compliance and operational excellence. info@alliancetg.com

All Bulk Gasoline Terminals currently fall under one of two regulations:   40 CFR 63 Subpart R (MACT R) for Major Sources of HAP  40 CFR 63 Subpart BBBBBB (NESHAP 6B) for Area Sources of HAP What Changed: Appendix K Requirements   for Bulk Gasoline Terminals The modifications to these regulations require instrument monitoring in place of AVO requirements. Facilities must choose between Method 21 or OGI monitoring, as outlined in Appendix K, to comply with bulk gasoline terminal requirements. Compliance Deadline: NESHAP 6B and MACT R with Appendix K   Existing sources: May 8, 2027  New sources: Upon startup  NSPS XXa: Earlier Compliance Dates May Already Apply   If you construct, modify, or reconstruct your affected facility after   June 10, 2022 , you are subject to NSPS XXa . This requires a quarterly Method 21 or OGI LDAR program, as outlined in Appendix K upon startup following construction, modification, or reconstruction.   Choosing Your Monitoring Method: Method 21 vs OGI   Method 21 uses a portable hydrocarbon detector to measure concentration at individual components. Surveyors physically access each valve, flange, pump seal, and connector with the instrument.  Optical Gas Imaging (OGI) monitoring , as outlined in Appendix K, utilizes infrared camera technology to visually detect hydrocarbon emissions across broad areas without requiring component-by-component contact.  When OGI Makes Sense   OGI cameras survey significantly more equipment per day than Method 21,  operating   6x to 22x faster . They eliminate the need for manlifts or scaffolding—depending on your site’s configurations—which  reduces both safety risks and costs. OGI also removes the requirement to maintain a detailed component inventory. Instead, facilities only need to identify equipment subject to LDAR requirements and provide a route map,  allowing for less burdensome compliance documentation. Overall, OGI reduces technician headcount, minimizes risk exposure, and simplifies data management. Please note that Method 21 may be a better fit for sites with an existing component inventory or state- or local-level Method 21 requirements already in place.   End-to-End LDAR Solutions for Bulk Gasoline Terminal Compliance   If your facility is subject to these regulations or you expect to become subject, now is the time to prepare.   We can help you determine applicability, prepare a plan, conduct inspections, manage the program, and prepare your reports.   Alliance provides nationwide Method 21 and OGI expertise backed by certified camera operators, licensed drone pilots, and experienced LDAR professionals. Our team helps facilities meet evolving survey requirements and strengthen their compliance programs with complete, reliable coverage.   Let's talk.

The EPA is using elevated fenceline readings as an entry point to take a deeper dive into other compliance programs, such as tanks, wastewater systems, and your facility's root cause analysis and corrective action response.   In September 2025, the EPA published an enforcement alert  that signals a new era of scrutiny for benzene fenceline monitoring compliance under MACT Subpart CC. With the first enforcement case concluded in Spring 2025 and more actions expected, this appears to be an expansion of the agency's broader Benzene Waste Operations NESHAP (BWON) and storage tank enforcement initiatives. Fenceline monitoring has evolved from a compliance requirement into an investigative tool that can trigger comprehensive inspections of related air quality programs.    What's Driving EPA Enforcement to Use Benzene Fenceline Monitoring Results?  The EPA has identified recurring compliance issues during facility inspections:  Common Problem Areas:  Storage tanks containing high benzene content materials (benzene, reformate, light naphtha, pyrolysis gasoline)  Marine vessel loading operations with vapor control failures  Wastewater treatment systems including uncontrolled DAF systems, junction boxes, and oil/water separators  Beyond identifying emission sources, many facilities are failing to conduct adequate root cause analyses and implement timely corrective actions when benzene action levels are exceeded—violations that can trigger significant enforcement actions.  The Stakes Are High  The Spring 2025  enforcement case   demonstrates what's at risk. The EPA took action against a facility with fenceline concentrations exceeding 900 µg/m³ and annual averages reaching 290 µg/m³—more than 30 times the 9 µg/m³ action level. EPA alleged violations related to untimely root cause analysis and ineffective corrective actions, along with violations related to BWON, LDAR, storage tanks, and flares. The facility was required to install real-time monitoring systems and implement comprehensive emission control measures as part of the settlement agreement, in addition to a civil penalty of $35 million.  Advanced Monitoring Solutions for Fenceline Programs   While this alert focuses on petroleum refineries under MACT Subpart CC, chemical manufacturing facilities subject to the HON will face similar fenceline monitoring programs in the near future—and the same root cause analysis and corrective action implementation expectations will apply.  The EPA's alert emphasizes using "best practices for finding root causes" of action level exceedances. These best practices require advanced monitoring technologies, all of which Alliance Technical Group  offers:  Optical Gas Imaging (OGI)  – Infrared cameras provide rapid screening across large refinery areas to identify fugitive emissions and leaks  Benzene-Specific PIDs  – Handheld photoionization detectors with parts-per-billion sensitivity pinpoint benzene emissions at specific equipment interfaces  Real-Time Monitoring Systems  – Gas chromatographs and continuous monitors provide near real-time measurements that correlate with wind direction and operational conditions  GMAP Technology  – Mobile geospatial monitoring solutions deliver real-time, actionable data to identify unknown emission sources and conduct rapid root cause investigations  Each of these technologies addresses specific gaps the EPA has identified in current compliance programs, providing facilities with the tools needed to meet regulatory expectations and demonstrate environmental stewardship.  Partner with Alliance for Proactive Compliance  The regulatory and enforcement environment surrounding benzene is intensifying, and the path forward requires more than just awareness—it demands action and expertise.  For over 25 years, Alliance Technical Group has been helping refineries and chemical manufacturing facilities navigate complex air quality compliance challenges with proven monitoring technologies and experienced technical support. From site specific monitoring plans to initiating root cause analysis or providing expertise in corrective actions plans, Alliance provides a better way to handle compliance.   Don't wait for an enforcement action to strengthen your compliance program. Let Alliance be your partner in protecting your facility and staying up to date with regulatory best practices.    Contact Alliance Technical Group today to discuss how we can help your facility meet EPA's fenceline monitoring requirements and build a robust, defensible compliance program.

A Strategic Partnership That's Paying Off What began as a collaborative innovation between ESC Spectrum and EPRI has evolved into a defining capability within Alliance’s Continuous Emissions Monitoring Systems (CEMS) business unit, which acquired ESC Spectrum in July 2025.  We didn't just expand our market leading CEMS capabilities; we strengthened our position as the industry's end-to-end provider for air emissions monitoring and reporting solutions. EPA Part 75:Successful Application of IP CEMS at LG&E’s Cane Run Generating Station Alliance and LG&E successfully installed and certified an Integrated Path (IP) CEMS on a gas turbine unit that is subject to 40 CFR Part 75, with relative accuracy certification completed in August 2025. This set the stage for a groundbreaking achievement: LG&E Cane Run became the first facility to successfully submit quarterly emission reports to the EPA via ECMPS using IP CEMS data while their conventional CEMS was out of service — a historic first under Part 75.   This milestone demonstrates that IP CEMS isn't just a backup technology; it's a viable, EPA-recognized solution for emissions monitoring and reporting.   Our hardworking team is pictured here after the IP CEMS passed its certification RATA in August 2025. (L to R) - Walt Mummert (RATA Lead, LGE), Daniel Champagne (Design Engineer, Alliance), Cindy Whitaker (Manager, Air Monitoring and Testing, LGE), and Joe Ward (Client Success Manager, Alliance). Adding to this momentum, the Clean Air Power Division (CAPD) of the EPA recently made changes to their Part 75 technical manual that sanctions the methodology used by our IP CEMS and removes the requirement for obtaining P75 Administrator approval for use of this methodology.  This regulatory endorsement opens doors for utilities and industrial facilities nationwide to adopt this innovative technology with confidence. The IP CEMS Advantage Traditional CEM systems have served the industry for decades, but they come with inherent limitations, including sample system biases, potential failure points, and significant O&M costs. Using Unisearch Associates , Inc. optical analyzers to measure gas concentrations along an optical path across a stack or duct downstream of an emissions source, our IP CEMS delivers: Faster, more representative measurements  that provide real-time insights into your emissions profile Elimination of sample system biases  that can compromise data quality and regulatory compliance Reduced failure mechanisms  that translate to better uptime and reliability Lower O&M costs and reduced operational burden , freeing up your team to focus on what matters most   For facilities struggling with aging CEMS infrastructure, facing budget constraints, or simply seeking to enhance their emissions monitoring capabilities, IP CEMS offers a path forward that doesn't require compromise.   Have questions about IP CEMS or how it might fit your facility's needs? Let's start a conversation ⮕   Want to learn more? Watch our in-depth interview with the IP CEMS experts below, featuring the same innovative team that developed this technology at ESC Spectrum and now continues to advance it as part of Alliance Technical Group. Alliance Technical Group is committed to advancing air quality monitoring through innovative technologies and strategic partnerships. Our IP CEMS solution represents the next generation of emissions monitoring—delivering accuracy, reliability, and cost-effectiveness in a single integrated platform.

Alliance Technical Group's GMAP service is a breakthrough in how we monitor and manage air quality. GMAP, which stands for Geospatial Measurement of Air Pollution, is like a high-tech detective for air pollution. It's a mobile service, meaning our team can travel around, gathering information on various air pollutants. It uses sophisticated technology to analyze this data and create detailed maps showing where these pollutants are most concentrated, helping to pinpoint the sources of pollution. Understanding Air Quality Challenges Air pollution is a complex issue. It's not just about the amount of pollutants in the air, but also about understanding how they move and change over time. Traditional stationary monitoring methods only give us a snapshot of the situation, often missing the bigger picture. Pollution doesn't stay put; it spreads and changes with the wind, weather, and other factors. GMAP's ability to move and track pollution in real time gives us a much clearer view of what's happening with our air quality. How GMAP Makes a Difference GMAP is essentially a mobile laboratory. Our team is equipped with advanced instruments to measure different types of air pollutants at numerous points across the facility, including along the fenceline and surrounding roadways. These instruments include multiple gas analyzers and highly accurate GPS systems for mapping. This technology allows for real-time, on-site air quality assessments, which are crucial for quick and effective environmental management. Alliance also collects weather data, bringing together gas analyzers, wind data, and GPS to generate maps. Wind direction is essential to this process as it allows our team to backtrack from the observed pollutant concentration to the potential emission source(s). Picture a petroleum refinery that needs to ensure it's not exceeding pollution limits. GMAP can be brought in to monitor the air both within and around the facility boundary at any location accessible by vehicles (including the facility fenceline, neighboring communities, etc.), giving instant feedback and helping to pinpoint potential areas of concern relevant to environmental regulatory compliance. Tech Trends and Advancements The technology behind GMAP is part of a larger trend towards smarter, more connected environmental monitoring systems. We're seeing a rise in the use of real-time data analysis, Internet of Things (IoT) devices, and advanced mapping software in environmental science. These tools are making it possible to understand and respond to environmental challenges more quickly and accurately than ever before. Benefits of GMAP Real-time Data and Analysis : The ability to gather and analyze data in real time is a significant advantage. It enables quicker responses to potential environmental hazards and helps in making informed decisions to mitigate risks. Advanced Mapping and Analysis : GMAP's geospatial mapping program enhances the understanding of air pollutant dispersion and source identification, which is crucial for effective air quality management. Mobility and Flexibility : Alliance's GMAP can move across a facility and monitor in real time, a significant advantage compared to stationary monitoring devices. This allows for a full picture of pollutant concentrations across the entire site and is less dependent on wind direction. Contribution to Public Health and Environment : By ensuring better compliance with air quality standards and providing accurate data on pollutant levels, GMAP plays a crucial role in protecting public health and the environment. Potential Results and Impact By providing real-time, accurate information about air pollution, GMAP can have a significant impact on: Improved Public Health : By identifying and addressing pollution sources more quickly, we can reduce exposure to harmful pollutants, leading to healthier communities. Increased Corporate Responsibility : Businesses can use GMAP to monitor their own emissions, helping them to operate more sustainably and responsibly. With its real-time data capabilities, mobile flexibility, and advanced analytical tools, GMAP provides a whole new performance standard for today's air quality challenges. The Alliance team continues to take significant strides forward in our ability to help our clients safeguard their environments and public health. As industry professionals continue to seek effective and actionable insights, Alliance's GMAP demonstrates how technology and environmental stewardship can work hand in hand for a healthier, more sustainable future.

We are proud to share that Alliance has once again been recognized as a Candidate Experience (CandE) Award winner for 2025.   The CandE Awards recognize employers worldwide that demonstrate a strong commitment to delivering a high-quality candidate experience throughout the entire hiring journey.   About The CandEs The Candidate Experience (CandE) Benchmark Research and Awards Program is the first program of its kind, focusing on elevating and promoting quality candidate experiences through a fair, transparent, and positive recruitment process. Now part of Survale, the CandE Benchmark Research Program evaluates companies through a combination of employer self-assessments and detailed feedback from job candidates. What This Means for Alliance This recognition reflects the care and effort Alliance delivers to provide transparency, fairness, and consistent communication to all job candidates . It’s proof that even in a challenging hiring market, our dedication to people and relationships sets us apart.   As Ron Machamer, Client Strategy Manager at Survale, shared, “In a slower hiring market, every candidate interaction is a chance to strengthen your employer brand, or weaken it. This year’s CandE Awards winners have again demonstrated their commitment to making impactful process improvements and we are delighted to recognize their work in raising the bar in recruitment and candidate experience.”   Winning this award again shows that Alliance is not only keeping pace, but we’re also leading the way. We want to take a moment to celebrate this achievement and the collective effort that made it possible, thanks to our people here at Alliance.   Our Commitment to Future Talent   We are excited to build on this momentum and continue improving our processes. We remain committed to excellence in recruitment and candidate engagement. Find your next job at Alliance ->

When Everything Stops   First comes a pressure drop. Then product escapes—onto the ground or into the air. Left unchecked, these issues can cause equipment damage, safety risks, and environmental harm.   Whether you’re dealing with a suspected leak in an exchanger or trying to bring a vacuum system back online, the urgency is the same: find the issue fast, fix it even faster.  Your team needs answers — not theories. That’s where Alliance’s helium tracer gas testing comes in.  When You Need Us Most — Planned or Not   Many of our clients find us in two key situations:  Unplanned emergencies  — A system crash, suspected exchanger leak, or unexplained pressure drop sends your team scrambling for answers fast.  Planned turnarounds or shutdowns  — You're proactively validating equipment such as exchangers, vessels, piping, instrumentation before bringing them back online.  The need is the same in both cases: leak testing that’s fast, reliable, and sensitive enough to catch what others miss .  When you call, we respond. For emergency situations, we can have a crew on-site within 12 hours. For planned outages, we’re ready to quote, schedule, and support testing as part of your overall outage plan — from weeks to months out.    The Real Cost of Undetected Leaks   Missed leaks can lead to:  Product loss and reduced profit  Unplanned shutdowns or extended outages  Environmental or safety violations  Rework during commissioning        What Is Helium Tracer Gas Testing?      Helium tracer gas testing is a non-destructive method used to locate and measure even the smallest cracks or holes in equipment. By introducing helium — a stable, inert gas — into the system and using a helium mass spectrometer, we identify leak paths with unmatched accuracy. Our instruments can detect leaks as small as 5 x 10⁻⁸ atm-cc/sec.     To put that into perspective, that’s like:  Detecting a leak smaller than a pinhole  Finding a crack thinner than a strand of hair  Spotting a flaw smaller than a grain of salt — divided a thousand times    This level of sensitivity is ideal for critical systems in petrochemical, energy, and industrial settings.      Why Helium Compared to Other NDT Methods?   Helium offers key advantages over traditional Non-Destructive Tests (NDT) methods like X-ray, PT (penetrant testing), UT (ultrasonic), MFE (magnetic flux leakage), and MT (magnetic particle testing):  Inert and non-toxic – Won’t react with hydrocarbons or pose personnel hazards  Non-condensable – Ideal for systems that can’t tolerate moisture or contamination  Ultra-small molecule size – Flows through micro-cracks that water or dye can’t reach  Minimal atmospheric background – Easy to detect even trace amounts  Safe and non-flammable – Unlike hydrogen blends or pressurized gases  Cost-effective – Compared to shutdowns, lost product, or premature tear-downs  Helium allows us to find problems without risking additional damage or downtime.    How to Find a Leak   There are two primary test methods, based on whether the system is in or out of service:  Detector Probe Method   (most common)   The detector-probe helium leak test is conducted by pressurizing a component with helium gas and then scanning the component by “sniffing” for the presence of helium with the detector probe. The mass spectrometer is monitored to verify the presence of helium leakage.  Tracer Probe Method   The tracer-probe test is conducted by placing the component under a vacuum and connecting it to the mass spectrometer. The tracer probe is then used to “spray” helium around the component under test. If a leak is present, the helium will be drawn into the part due to the differential pressure. The mass spectrometer is monitored to verify the presence of helium leakage.    Note: While some systems can be tested during operation, exchangers and pressure vessels typically require shutdown to ensure accurate results.    Why Test Proactively?   Leaks that go undetected aren’t just annoying — they’re expensive. Product loss, safety hazards, environmental liability, and unplanned downtime all add up. And in critical systems, even a small leak can snowball into a full-blown operational risk.  Proactive helium testing helps you:  Validate repairs before re-commissioning  Avoid repeat outages from missed defects  Protect against emissions or safety violations  Reduce risk of unplanned shutdowns or catastrophic failures  In short, it’s a small step that prevents big problems.    Why Choose Alliance for Locating a Leak   Alliance’s process is grounded in ASME Section V, Article 10 , ensuring we follow best practices for helium mass spectrometer leak testing.  Unlike vendors who offer helium testing as a secondary service, we have a dedicated team solely focused on tracer gas testing. That means:  Faster response times — Mobilization typically begins within 2–4 hours, with on-site arrival within 12 hours for emergency jobs  Deeper technical expertise & comprehensive planning  Purpose-built equipment maintained to the highest standards  Smoother coordination on jobsites during outages and emergency repairs  You’re not getting generalists. You’re getting a specialized helium testing team that knows your environment, your schedule constraints, and your goals.        Frequently Asked Questions Can you support our scheduled turnaround window?  Yes. We can align with your planning window or mobilize quickly in unplanned situations. Mobilization typically begins within 2–4 hours, and we aim to arrive on-site within 12 hours when needed.  How fast do we receive results?  A field report is provided immediately after testing. Final, formal documentation is emailed shortly after the job is complete.  Can we receive a copy of your testing procedure?  Yes. We follow ASME Section V, Article 10 and can send our procedures ahead of time or while on-site.  How long will the test take?  Test times vary based on system size and complexity. We also accommodate your facility's access and safety protocols.  Do you repair leaks if found?  We don’t perform repairs, but we do remain on-site at your request to retest any areas after repair work is completed.  What do you need us to provide?  Just plant air, nitrogen, and 110V power. Our crews are otherwise fully self-sufficient.

Whether you’re a pipeline owner, an RNG landfill facility or a wastewater treatment plant with a digester, sampling your product gas is a must for quality. With over 3,000 companies owning and operating natural gas pipelines alone, and dozens of varying tariff requirements for that gas quality, you want to make the right decisions when it comes to a company that can support those sampling and analytical needs. Alliance Technical Group brings something different: 25+ years of field experience, certified labs nationwide, and a proven track record of getting RNG to market. We don't just test, we partner with you to navigate and simplify the entire compliance journey. Here's how we guide you at every stage: 1.  Permitting Strategy - Avoid Costly Delays We map out your compliance strategy, build your testing calendar, and provide consulting that sets you up for long-term success. 2.  Precision Sampling – Get It Right the First Time ATG uses specialized sampling equipment and experienced scientists which gives us the edge when efficiency and precision matter. Each project is unique, from tariff requirements to sampling locations, so ATG offers customized solutions ranging from selecting the right sampling methods to developing initial and ongoing verification phase testing plans. 3. Source Testing – Meet Every Standard Whether it’s flare compliance, landfill gas, or digester output, ATG provides source testing that ensures emissions meet varying industry standards. 4. Lab Analysis – Fast, Defensible Results With certified labs nationwide, ATG delivers rapid, high-precision analysis for siloxanes, H₂S, VOCs, mercury, ammonia, pesticides/PCBs, carbon-14, moisture, and more. 5. Reporting & Compliance – Audit-Ready Documentation ATG turns complex data into actionable reports, complete with regulatory-ready documentation built for audits. Our results speak for themselves: Alliance has successfully guided over 30 sites to pipeline interconnection and is currently supporting   75+ LFG (Landfill Gas) sites in preparation for future RNG plants. As we strive to be at the forefront of this new venture here in the US, we’re doing our part for a cleaner environment through RNG sampling. Ready to simplify RNG testing and compliance? Connect with our experts today —or meet us at the RNG Works Conference, Sept. 23–25 in Nashville.

An inside look at how Alliance supports clients through every stage of compliance At Alliance, environmental compliance isn’t just checking boxes—it’s about building trust by building customized solutions for every client. Tanvi Desai, Director of Compliance Services , has spent the past decade doing just that. In this Q&A, she shares changes she’s seen in her career and the secret to building long-lasting positive relationships across the industry. What exactly is environmental compliance, and what do you and your team do for clients? For background, federal governments and state governments, and cities and counties, come up with rules and regulations to control pollutants across industries. Our role is to help all industrial clients across the country facilitate their needs for permits and their needs for recordkeeping. But our job doesn’t end with “OK, you have a permit, you're good to go.’ It starts there. We go out on site checks regularly—monthly or quarterly—to help our clients stay in compliance. And it cannot be one solution that fits every client. Each client is different, each client’s requirements are different, and their permits are different. So, our role is to customize our program for each client to make sure we do the right job. Do you find that some companies still take a reactive approach to compliance rather than a proactive one? Yes, definitely. A lot of companies don’t want to spend money on environmental compliance unless they get a violation from a state or federal agency. Some people don’t take it seriously until there’s an issue. But in the last ten years, and especially the last five, I’ve seen more and more clients understanding that one audit isn’t enough. An audit just tells you what’s wrong. It doesn’t solve the problems. That’s where we come in. We’re the real problem-solvers. When we work with clients regularly, they don’t have to worry about compliance on a daily basis. We allocate the right experts to find solutions for whatever comes up. What’s the key to building long-term relationships with your clients? You don’t want sales to be only about selling. Everyone needs to be heard, to be understood, to have their problem understood. If their problem is with safety and OSHA [Occupational Safety & Health Administration], I get the subject matter expert for that and find a solution. If they have a budget problem, I suggest a budget-friendly option. I love the relationships we build with our clients. My role is to find a solution for what they  need, not what I want to sell. That’s where we win the clients’ heart. And they say, “I want to give you all my environmental work because I trust you and I trust you’re not just here to sell.” That’s what I try to pass on to my team as well: wherever you go, with whichever client you meet, your first goal is to be helpful. If you understand their problem, solve it, they’ll be your forever-client. And it’s really like that. Can you share a project that reminded you why you do this work? One in particular stands out. One client had an EPA inspection and was given a list of 70 findings—missing documentation, incomplete records, permit issues. They had two or three months to resolve everything. It was a lot. We had to work together as a team and come up with a solution and a plan to save them from getting a big violation and a big fine. And we did it. They met all the requirements. That was challenging but a fun project. And they’re still our client many years later. They know they can rely on us to do the right thing. What do you want people outside the industry to know about the work you do at Alliance? We really try our best to be the best company in terms of work culture, by mentoring our team members and growing their career path. And doing the right thing for a healthy environment too. We also involved ourselves in a lot of volunteer work. Recently we did a clean-up in Galveston Beach. Alliance at a local volunteer beach cleanup program dedicated to keeping Texas beaches clean What do you want people in the industry to know about your work at Alliance? Things can get complicated for clients working in this industry. So we offer it all–permitting, compliance, stack testing, LDAR [Leak Detection & Repair], industrial hygiene, OSHA studies, groundwater remediation, wastewater design—and much more. There are so many regulations we have to keep up with. There’s constant change. Sometimes it’s federal, sometimes it’s state or county regulations that are changing. We are all putting in an effort to provide a solution for all industries, not just one. You’re a woman in a leadership role at a major environmental firm. What has that journey been like for you? Honestly, I never thought I would be where I am right now. When I started my career, I just needed a job. But once I got into this field, I realized I really liked the work. And I found I have a leadership quality. I wouldn’t say it was easy. It can be like a rollercoaster ride. When I come to the office in the morning, there is a new challenge on my door. I always rely on what I’ve learned: the problem-solving skills, the time-management skills, just knowing you’re doing the right thing. You just have to keep showing up for yourself, for your team, for your clients–and do the job right. And you’ll get there. That’s my motto. Do the job right, every single day. When you have that, it’s like you’re unstoppable. With Alliance, there's a better way. Navigating compliance doesn’t have to be complicated. At Alliance Technical Group, we simplify the process with tailored programs, ongoing support, and deep regulatory expertise. From environmental compliance and LDAR audits to health & safety consulting and industrial hygiene assessments, our team partners with you to reduce risk, improve efficiency, and achieve confident compliance. Ready to streamline your compliance?

Accurate Source Testing, Seamless Logistics, and Proven Compliance Support

Loyalty isn’t just a word; it’s a practice. Marking his 20-year anniversary at Alliance, Snapper Armstrong , Vice President of Sales for our Stack Testing division, shares what that means to Alliance teams and to our clients. Snapper, what was your first role at Alliance all those years ago? I first came on as a sales rep in 2004, and I noticed the Stack Testing group had tons of growth potential, and that was exciting. I spent most of my time learning everything I know today about stack from Chris LeMay (CEO), Jeremy Hutchens (VP of Stack Testing), and Ryan O’Dea (SVP of Stack Testing), all of whom are still with Alliance today. Do you think it matters to our clients that many Alliance employees stay for the long haul? Definitely. Employee loyalty goes hand in hand with client loyalty. If clients were constantly talking to a different Alliance contact, it would be difficult to build relationships that generate loyalty and trust. On the flip side, we’re continuing to hire new talent and develop their skills. The key is that we have a lot of tenured experts—either with Alliance or with one of the companies we’ve acquired—supporting newcomers, so clients know they’re always getting advice and guidance from an experienced professional. Why should clients trust Alliance for their Stack Testing needs? A few of our clients have been with us for 20 years or more and many of our field staff are on a first-name basis with their clients. Alliance also has a deep bench of technical professionals and subject matter experts, so there’s always a skilled specialist available to help in any situation. That assurance goes a long way. What do you do in your current role at Alliance? I provide environmental compliance solutions for clients, with an emphasis on Stack Testing. But it’s so much more than that. Really, it depends on our clients’ needs. If they’re looking for Stack Testing, Water Sampling, Permits, or Environmental, Health and Safety Consulting Services—I’ve got a solution. I also work closely with our sales teams to gain insights into the types of services our clients are requesting and to make sure newer team members fully understand our clients’ needs and how we can help. What has kept you working at Alliance for so long? It’s really the people I’ve worked with over the years that’s compelled me to stay and build a career here. Working with people you can count on, and trust builds loyalty. That’s the simple answer—trust and loyalty with good people who watch out for each other and our clients, together .Every team member at Alliance is not just trained and released to the field—we have each other’s backs. We have a large foundation of experts here to teach, advise, troubleshoot, and mentor on every job, for every situation, every step of the way. That develops more loyalty, more trust. What do you think it takes to be a good stack tester? Stack Testing is a physically and mentally demanding job. There’s a lot of time spent on the road, traveling back and forth to job sites. There is also a significant amount of loading, unloading, reloading, and prepping equipment for each project. In general, good Stack Testers can come from any background, if they can learn quickly and react swiftly in any type of situation. They also have to be confident working with their hands, assembling, disassembling, and reassembling equipment. Sometimes what works perfectly in the shop may not work perfectly in the field, so there’s a lot of troubleshooting and thinking on their feet to figure out a solution. And you can’t be afraid of heights! It’s a great match for climbers and adventurers. Stay ahead of compliance deadlines—schedule your Stack Testing project today. Don’t scramble at the last minute—reach out now while it’s top of mind. You can even discuss any future testing needs and get them scheduled early. With Alliance, there’s a better way. We’re a new kind of environmental services company — powered by innovation, focused on service,and committed to our clients’ success. Dedicated to helping you achieve your environmental goals and mitigate the risks associated with regulatory changes, we deliver on the promise of reliability, results, and responsiveness.

Alliance Technical Group (ATG) believes our greatest strength lies in our people. While process and technology are key pillars of our business, it is our people who lead the way. That’s why we are committed to training, developing, and promoting team members from within.   As part of that commitment, ATG partnered with   Development Dimensions International (DDI) , a global leader in leadership development and assessment. Investing in and developing internal talent, 5 team members completed the DDI Certified Facilitator program, building internal leadership knowledge and expertise to facilitate current and future development programs.   In May 2025, we launched the   Ascend Leadership Program , a development initiative designed for front-line leaders. This program helps participants explore the core principles of leadership, understanding themselves, leading others through change and uncertainty, motivating and empowering teams, and ultimately, driving meaningful results, not just as managers, but as people first, business-driven leaders.   Leadership Program This first cohort included 16 ATG leaders who dedicated themselves to approximately 20 hours of leadership development over an 8-week period. Key components of the program included:  Behavioral Assessment:  Provides insight into natural behavior and leader styles  Live, Virtual Sessions:  Interactive sessions covering communication, trust-building, team leadership, and change management  Self-Paced Learning:  Flexible modules focused on performance coaching, conflict resolution, and counseling strategies  Peer learning  that fostered empathy, accountability, and shared growth  Following the successful completion of the pilot program, we are excited to announce the launch of our second and third cohorts, bringing together 39  additional leaders from across various business units.  We look forward to continuing this journey and becoming a world-class leader of people development.  "In 2023, Alliance began investing heavily in the Learning and Development team and expanding employee training and development to align with our focus on career progression. The initial focus was centered around technical training to ensure our employees were equipped with knowledge to continue our industry-leading technical expertise. The Ascend Leadership Program, with a focus on developing leadership skills for our front-line leaders, has proven its value, and I am proud of Alliance’s commitment to investing in our most valuable asset-our people!" -  Chris LeMay , CEO

Alliance Technical Group , a leading provider of environmental testing, monitoring, and compliance services, announced today the acquisition of Global Analyzer Systems Ltd. , a Calgary-based emissions monitoring company that has been serving industrial clients since 1996. Global Analyzer Systems is known for its deep expertise in continuous emissions monitoring systems (CEMS), delivering specialized and customized solutions to meet evolving regulatory demands. With over 25 years of experience, the company has built a strong reputation for client-focused service, regulatory compliance support, and technical innovation. Global Analyzer is not just a provider of products, it is a solutions-driven team of experts passionate about solving complex environmental challenges through ingenuity, collaboration, and education. "Global Analyzer Systems brings a culture of innovation and technical excellence that fits perfectly with Alliance’s long-term vision," said Chris LeMay, CEO of Alliance Technical Group. "Their collaborative, client-centric approach strengthens our ability to offer emissions compliance solutions across North America." The acquisition enhances Alliance’s capabilities in emissions measurement, CEMS integration and support, and regulatory compliance services. With Global Analyzer’s deep experience in designing and delivering custom emissions monitoring solutions, Alliance is better positioned to help industrial clients across North America maintain compliance and operational confidence in an evolving regulatory landscape. Justin Raffin, President, Global Analyzer Systems Ltd. "Joining Alliance provides us with the opportunity to expand our impact and serve our clients in new ways," said Justin Raffin, President of Global Analyzer Systems Ltd. "Our mission has always been to bring certainty to emissions measurement. With Alliance, we now have the resources and reach to scale our innovative approach and deliver even greater value to our partners." Through this acquisition, Alliance is continuing its growth strategy of expanding its capabilities and geographic footprint to better serve regulated industries throughout North America. Sampford Advisors acted as exclusive financial advisor to Global Analyzer Systems.

Decatur, AL and Pensacola, FL – July 7, 2025 Alliance Technical Group (“Alliance”), a premier provider of environmental compliance, on-site testing and monitoring, and laboratory testing services, today announced the acquisition of ESC Spectrum, the premier provider of Continuous Emissions Monitoring Systems (CEMS) and Data Acquisition Systems (DAS) services with more than 50 years of innovation and client success. For decades, ESC Spectrum has helped industrial facilities meet stringent air-emissions regulations through its vertically integrated portfolio of software, hardware, and field services. By bringing ESC Spectrum’s talent and technology into Alliance, the combined organization gains extensive experience in CEMS and DAS engineering, data analytics, integration, and lifecycle support, extending Alliance’s ability to serve clients across every regulated industry and geography. “This transaction is a watershed moment for our company and the emissions monitoring marketplace,” said Chris LeMay, Chief Executive Officer of Alliance. “ESC Spectrum’s proven, end-to-end solutions and scale instantly elevate Alliance to the leading provider of CEMS and DAS services across the globe. Together we will deliver unparalleled value – pairing world-class monitoring technology with the industry’s largest field-service, parts, and technology footprint.” The acquisition enables Alliance to: Deliver the first truly end-to-end CEMS platform – from integration and installation to real-time data management, regulatory reporting, and long-term maintenance Bundle CEMS, Stack Testing, Environmental Compliance, and Laboratory Testing to lower the total cost of compliance and streamline vendor management for clients Scale ESC Spectrum’s commercial model across Alliance’s nationwide service network, accelerating time-to-value for thousands of facilities already under Alliance care Invest in next-generation emissions data analytics, unlocking predictive insights that help clients optimize operations, minimize downtime, and stay ahead of evolving regulations “Joining forces with Alliance amplifies everything we do best,” added Jeff Rabensteine, President of ESC Spectrum. “We now have the resources and reach to accelerate product innovation, expand field support, and ultimately help more clients achieve comprehensive compliance in a rapidly changing regulatory landscape.” The transaction represents a significant milestone in Alliance’s strategic growth plan to assemble the industry’s most specialized technical capabilities under one roof – empowering regulated industries across North America to meet their environmental obligations with confidence. Alliance is backed by Morgan Stanley Capital Partners (MSCP), a leading private equity firm with deep experience supporting growth-oriented businesses in the industrial and environmental services sectors. MSCP has played a critical role in supporting Alliance’s acquisition strategy and operational expansion as the company scales to meet growing regulatory and sustainability demands across the market. Jones Day served as legal advisor to Alliance. Download a copy of this press release