Get solutions for your most important and complex compliance challenges. From on-site assessments and monitoring to laboratory analyses for air, water, soil, and waste—Alliance can help you do it better. We are different. While others expect you to adapt to them, we adapt our approach and service delivery to you. We are built from the ground up with a single focus—to provide our clients with compelling responses to their environmental and compliance challenges. We take an innovative, technology-first approach to helping you solve your business problems while minimizing your impact on the environment. Commitment to getting it right. When “good enough” just isn’t enough, turn to us. We build accuracy, precision, and quality into everything we do. Fast and adaptive approach. We design our project teams around your precise goals, quickly deploying the right experts and equipment to meet your needs. Dedicated and experienced experts. Our engineers, scientists, and compliance professionals are creative problem solvers with a total focus on your goals. Technology-powered insight. We help you unify and integrate your initiatives by connecting many sites and data streams into a single easy-to-manage, technology-enabled portfolio. Markets we serve. We support leading companies and brands across a wide range of markets. We understand the special challenges of each sector and have the experience, approach, and capabilities to make a difference. Building & Construction Chemical & Processing Data Centers Energy & Power Environmental & Waste Management Food & Consumer Goods Government & Institutions Manufacturing & Production Oil & Gas Pulp & Paper Renewable Natural Gas (RNG) Semiconductors MARKETS & INDUSTRIES We are problem solvers. Get solutions for your most important and complex compliance challenges. From on-site assessments and monitoring to laboratory analyses for air, water, soil, and waste—Alliance can help you do it better. Environmental Compliance Build your winning regulatory strategy with help from our consultants and compliance experts—who bring the knowledge, insight, and proven industry experience to ensure your success. On-site Testing & Monitoring Expect reliable, on-time results without slowing down operations. For all your testing needs, we have the experienced teams and industry-leading technology to take it on. Laboratory Testing & Analysis Access a world-class lab network that combines broad reach with unmatched responsiveness. From sample collection to analysis, our technicians deliver precision and insight. OUR SERVICES Environmental compliance shouldn’t be an endless costly challenge. We help clients take back control. It starts with a fresh approach. Alliance is a new kind of environmental services company—powered by innovation, focused on service, and committed to client success. ABOUT US

Founded in 2000, Alliance Technical Group has grown from a small Alabama stack testing company to North America's leading environmental services provider with 1,805 employees. Learn more about Alliance Technical Group. Creating new possibilities and outcomes for our clients. Since 2000, we have been solving the problems of environmental management and compliance for some of the foremost companies and brands in North America. From on-site testing and monitoring, to laboratory testing and regulatory strategy, we are pushing out the limits of what is possible. We help our clients achieve their business objectives while also supporting their sustainability goals. OUR SERVICES 2200+ Dedicated Employees 60+ Locations in the US and Canada 110+ Mobile Laboratories Our Journey Founded in 2000 in Alabama as a small stack testing company, Alliance has since expanded into a full-service environmental compliance provider and a recognized leader in the North American market. A lot has changed for us since then, but one thing never will—we still put our clients first. EMPLOYEES 2000–2012 BUILDING THE BUSINESS 2012–2016 GROWTH THROUGH INVESTMENT 2016–2021 RAPID GROWTH & SERVICE LINE EXPANSION 2021–TODAY SCALING A NATIONAL/GLOBAL PLATFORM 2000 2 2005 10 2010 20 2015 50 2018 125 2020 675 2021 820 2022 945 2023 1,430 2024 1,720 2025 2,205 Stack Testing Lab Testing LDAR Ambient Air Consulting CEMS Software Acquisitions Since 2017, we have worked to increase our reach and improve our services through investments in our people, technology, and with acquisitions of these core businesses. Expand to see acquired companies 2025 Global Analyzer Systems ESC Spectrum Environmental 360 Slipstream Environmental Services 2023-2024 DeNovo Global Technologies Ranger Analytics (Merger) GOLD, LLC CEMServices Rogers & Callcott Advanced Industrial Resources CEMSI Integrity Air Monitoring RSB Environmental Ortech Consulting Chemtech Consulting Group CEC Stack Test Group Summit Env. Tech Orange Coast Analytical Fremont Analytical Chester LabNet 2021-2022 GBMc & Associates EcoTest GuideWare CK Environmental InspectionLogic Pace Environmental CEM Solutions Interpoll Ace Consultants AAS Horizon Air Measurement Services Air Quality Services O’Brien & Gere EMSI Aeros Environmental 2017-2020 Almega Environmental and Technical Blue Mountain Summit Inspection Services METCO Environmental Air Pollution Testing Golden Specialty Our Commitment to Sustainability Our commitment goes beyond compliance—we create practical, scalable solutions that reflect our responsibility to protect our world. From reducing emissions and waste to supporting our people and communities, we’re focused on delivering meaningful progress today while building a more sustainable tomorrow. GET INVOLVED We are a new kind of environmental services company—powered by innovation, focused on service, and committed to your success. Our Reach With over 50 testing and laboratory locations across the United States and Canada, we are where you need us. Leadership Our team stands behind everything we do and commits to helping you succeed. From our frontline engineers and technical experts to our senior leaders, we are here for you. FROM LEFT: Chris LeMay, Jim Herr, Kim Van Soelen, Premal Vora, Tyler Rudman Chris LeMay Chief Executive Officer Tyler Rudman Chief Financial Officer Kim Van Soelen Chief Commercial Officer Jim Herr Chief Administrative Officer Premal Vora Chief Strategy Officer

Critical 2025 air quality reporting deadlines & compliance guidance. Stay compliant with EPA requirements. Expert assistance from Alliance consultants. 2025 Air Reporting Deadlines The Better Way to Navigate Compliance Reporting deadlines are approaching fast—be proactive with expert help. Environmental compliance is more than just remembering a date—we know the process can be complicated. That’s why Alliance takes a proactive approach. Staying ahead gives us the flexibility to handle unexpected adjustments and ensure you meet your goals—on time. From deadline reminders to consulting expertise and even reporting, our experienced environmental consultants and compliance professionals help you every step of the way. Take the complexity, uncertainty, and hassle out of regulatory standards. Contact us to help you navigate compliance with confidence. Content h3 Click a State From the Map Below to View Air Reporting Deadlines Disclaimer: Alliance Technical Group shall not be held liable for any reliance on this content. It is the responsibility of the user to confirm compliance with all applicable regulations.

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