Comprehensive source testing services including stack testing, CEMS, engine testing & specialty emissions testing. Industry-leading accuracy & compliance. Services / On-Site Testing & Monitoring / Source Testing Source Testing Quantify emissions at the source. Accurate, defensible source testing data that’s measured, analyzed, and reported reliably every time. Our skilled professionals consistently and rapidly deliver that first-class quality service which translates directly into our high client retention and satisfaction rates. Resource-ready. A wide North American footprint and consistent investment in state-of-the-art equipment positions our dedicated teams of skilled specialists to respond efficiently to each client’s source testing needs. Trustworthy expertise. The multi-disciplinary expertise of our staff ensures our clients receive full-service guidance on regulatory compliance, industrial processes, source emissions testing, monitoring, and analysis. Actionable insights. Accurate, quality-controlled emissions data enables clients to make real time data-driven decisions—and our dedicated Technical Services team ensures test results are accurately reported to regulatory authorities. Services & Solutions Source Testing Stack | CEMS/Temp CEMS | Engine Testing | RNG Stack Testing Committed to your specific stack testing needs—Alliance’s combination of innovation, technology, and reliability is anchored by a seasoned team of scientists, QSTI-certified professionals, and tenured stack testing managers driving your projects to successful completion. Compliance Demonstration | Engineering/Investigative Test Programs | On-Site FTIR Spectroscopy | Specialty Testing | Low Level PM Sampling | Performance Specification Testing (RATA) Stack Service Details CEMS (Continuous Emissions Monitoring System Services) Reduce your downtime risk with CEMS tailored to your local needs and count on our extensive spare parts stock for fast service on your specific brand of equipment. Let our North American CEMS and dedicated Temp CEMS services be the cornerstone of your environmental compliance and operational success. Turnkey CEMS Integration | Temp CEMS | Installations | Commissioning | Training Equipment Upgrades | Maintenance | QA/QC Audits | RATA CEMS Service Details Engine Testing Boost efficiency and safety for your combustion source program with our expert advice and mobile solutions.  Our engine testing platform is designed to gauge performance in real-time, which helps you manage your operations and compliance status more efficiently. Flexible Scheduling & Mobility | Fast Response | Reduces Risks It’s a smart move to protect your operations from risks, extend the life of your engines, and get an edge in the market. Engine Testing Details RNG (Renewable Natural Gas Services) As the demand for renewable natural gas grows, so do the challenges associated with meeting the rigorous pipeline quality standards. These low-level requirements provide no room for sampling or analytical error. We have the expertise and advanced equipment to ensure accuracy, every time. Sampling | Analysis | Reporting | Compliance | Batch Pathway Testing | Product Transfer Documents | Third Party Audits | Investigative Consulting/Engineering Let Alliance’s experienced technicians simplify the sampling, analysis, and reporting procedures for you. Using advanced equipment and analytical capabilities, we manage every step of the RNG testing process. RNG DETAILS Talk to an Expert “It’s our daily priority to put in the work to build a culture where Quality, Integrity and Consistency are the standard. Our clients benefit from that culture in the form of accurate, defensible test data provided by skilled professionals.” Ryan O’Dea Senior Vice President, Stack Testing Learn more about Source Testing. Back to All Services

Comprehensive environmental services including consulting, compliance, testing, monitoring & laboratory analysis. Minimize risk & maximize results with Alliance experts. Delivering every environmental compliance service and solution your company needs. Let's get started. Discover our integrated line of services designed to meet all the environmental compliance needs and challenges your company faces. How can we make your compliance journey better? ENVIRONMENTAL COMPLIANCE Expert guidance to extend your people and possibilities. Minimize risk and maximize results with the clarity, insight, and deep domain knowledge needed to make informed decisions. Alliance consultants and compliance professionals are committed, responsive experts at uncovering innovative solutions to your challenges. Environmental Consulting Air, Water, and Natural Resources Compliance Services Audits, Reporting, and Health/Safety Assessment & Remediation Due Diligence, Engineering, and Remediation On-site Testing & Monitoring Testing and monitoring tailored to your needs. Your testing and monitoring results are critical. Our dedicated teams, advanced methods, and full-service collaboration ensures your success. We perform with precision, causing minimal operational downtime, if any. Source Testing Stack Testing, CEMS, Engine Testing, and RNG Fugitive Emissions LDAR, Ambient Air, OGI, and SkyBridge Software Laboratory Testing & Analysis A national lab network that puts the focus on you. Receive fast results and client focus of a local lab, with the capabilities and reach of an advanced national lab network. If your current lab provider doesn’t meet all your testing needs and timelines, or fails to offer actionable and effective results, turn to Alliance labs. Environmental Lab Services Water, Waste, and PFAS Oil & Gas Lab Services Upstream, Midstream, and Downstream

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

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.

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.

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.