The concept of calibrating analyzers seems straightforward. When applied to a full CEMS, however, enough acronyms and percentage thresholds are involved to make things complex fast. This article clarifies the calibration gas requirements for CEMS users under Part 60 and Part 75 — including system calibration, gas grades, bottle management, and common issues. System Calibration The first thing to understand is what EPA regulations actually require to be calibrated. While the focus is often on individual gas analyzers (NOx, O2, CO, etc.), EPA requires calibration of the entire CEMS. That means calibration gas must be introduced as close as possible to the sample gas entry point, so it travels the same path through the system as actual stack gas — up the umbilical, in at the probe, and all the way through to the analyzers. Two regulations cover the majority of CEMS in the U.S.: 40 CFR Part 60 and 40 CFR Part 75. While state and local rules also apply in some cases, this article focuses on these two. Daily Calibration Checks EPA regulations require daily calibration checks for CEMS. This is an automated process: a controller (PLC or datalogger) opens and closes solenoids to introduce calibration gas into the system. The DAS records the readings and compares them against the known calibration gas values to determine pass or fail. Each day, a zero and span check is performed. Zero gas must be within 0–20% of the analyzer's measurement range. Span gas concentration requirements differ by regulation: Part 60: 50–100% of range Part 75: 80–100% of range For example, a NOx analyzer with a 0–500 ppm range would typically use a span gas in the 250–500 ppm range. Part 60 requires daily calibration to land within 10% of the calibration gas value. Errors over 10% are a failed calibration. Errors between 5–10% are considered bad calibrations; four consecutive bad calibrations are treated as a failure. Part 75 requires daily calibration to be within 5% of the calibration gas value. For both programs, if dual-range analyzers are in use, both ranges must be checked. A failed calibration typically requires operator intervention to adjust the analyzer. Quarterly Calibration Audits In addition to daily checks, EPA requires quarterly calibration audits to verify system performance. These audits can be fully automated using a controller and solenoids to introduce calibration gases. Part 60 — Cylinder Gas Audit (CGA) The CEMS is challenged three times each with low- and mid-level gases: Low gas: 20–30% of analyzer range Mid gas: 50–60% of analyzer range Passing error limit: 15% Part 75 — Linearity Test The CEMS is challenged with three concentration levels: Low gas: 20–30% of range Mid gas: 50–60% of range High gas: 80–100% of range Passing error limit: 5% Calibration Gas Cylinders Blends Calibration gas is available in various configurations, blends, and concentrations. To reduce cost and simplify logistics, CEMS typically use blended cylinders — many gases can be combined in a single cylinder and remain stable. A common example: for a NOx/CO/O2 CEMS, only two cylinders are needed for daily zero and span checks across all three analyzers. A NOx/CO blend in nitrogen handles the span for NOx and CO while also serving as the O2 zero. A separate oxygen cylinder handles the O2 span and doubles as the zero for NOx and CO. Selecting a Gas Grade Cal gas manufacturers producing EPA Protocol bottles must be audited and registered with EPA. Their products must meet NIST traceability standards. To differentiate their offerings, manufacturers use various tradenames — EPA Protocol Gas, EPA Certified Gas, RATA Class Protocol Gas, Compliance Class Protocol Gas, Emission Credit Gas, and others — which can create confusion. The bottom line: CGAs and linearity tests under both Part 60 and Part 75 must use EPA Protocol gas certified to an analytical uncertainty of no more than ±2% of the tag value (95% confidence interval). Both 1% and 2% Protocol gases are acceptable. For daily calibration checks, many facilities use NIST-traceable certified gas at 1% or 2%. The price difference between grades can make this practical, particularly for daily bottles that are consumed more frequently than quarterly audit cylinders. Bottle Life Cal gas cylinders come with expiration dates on their certification certificates. Depending on the gas type, certification periods range from 1 to 8 years. Quarterly audit bottles are used infrequently and often last for many years; most are certified for 2 years. Current regulations allow for recertification of bottles to extend usability — in many cases, sending a bottle back to the manufacturer for recertification is less expensive than purchasing a new one. Bottle Placement Cal gas bottles can be placed indoors or outdoors. Positioning them close to the CEMS cabinet or shelter is preferred, and ground-floor placement simplifies routine cylinder exchanges. Indoor placement requires personnel protection measures in case of a leak — ambient gas monitors are standard when bottles are housed inside a shelter. Outdoor placement requires a hood or shelter to protect regulators from freezing in icy or snowy conditions. The cylinders themselves do not require weather protection. Cal gas bottles should be plumbed to the CEMS using Teflon or stainless steel lines. Regulator selection — brass or stainless — is based on gas type: corrosive or non-corrosive. Common Issues with Calibration Gas Cylinders When troubleshooting calibration problems, run through these questions: Do you have the correct cylinders? Concentrations must fall within the specified ranges for your regulation. Confirm you have all concentrations needed for testing and calibration. Is there enough gas available? You need enough to troubleshoot, calibrate, and complete CGAs or linearities, plus spare cylinders in case of a leak or failed bottle. What is the cylinder pressure? Monitor cylinder pressure regularly. Do not run cylinders below 150 psi — this risks contamination. Exchange cylinders at 200 psi. Are cylinders at risk of contamination? Running a cylinder too low is the most common contamination pathway. Staying above the 200 psi exchange threshold prevents this. How Alliance Technical Group Can Help Alliance Technical Group provides comprehensive CEMS support — field maintenance, regulatory and reporting services, training, and more. Whether you need help troubleshooting a calibration issue, setting up a new system, or managing ongoing QA requirements, our team covers both the CEMS side and the data side. There's a Better Way.

As awareness rises about per- and polyfluoroalkyl substances ( PFAS ) entering into our ecosystem, so does the urgency for accurate, dependable detection. Associated with certain cancers, endocrine disruption, fertility issues, birth defects, and organ damage, PFAS poses significant public health risks. The EPA is taking action  with several new initiatives, including the “First-Ever National Drinking Water Standard for PFAS” issued in April 2024, plus other rules for PFAS limits for non-potable water, air, soil, and waste management sources.  PFAS Experts at Work  See how Alliance’s environmental laboratory specialists conduct accurate PFAS analyses. Comprehensive PFAS Testing Services for: Applied Technologies Our labs utilize advanced liquid chromatography triple quadrupole mass spectrometry systems (LC/MS/MS) for PFAS analysis. This preferred technology offers unparalleled selectivity and sensitivity, enabling us to handle extremely low detection rates with ease. Robust Quality Control A 3-tiered data review process ensures all testing method criteria are met, giving you confidence in your results: Top analysts carefully examine the data. Data is sent to our QC department for thorough evaluation. Dedicated project managers review the final results. Full-Service for Client-Specific Needs All PFAS analytical steps are handled for you in Alliance labs, including method development, extraction, analysis, and data upload. Highly skilled experts work with you to customize solutions based on your state’s regulatory requirements. We’re at the forefront of PFAS analysis with the most modern methods at the lowest detection limits. Reach out to discuss your PFAS testing needs or consult with one of our experts regarding your PFAS compliance requirements. 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  | (256) 351-0121

Written by John Cutaia, Field Service Technician at Alliance Technical Group Continuous Emissions Monitoring Systems (CEMS) are critical infrastructure for environmental compliance, operational decision-making, and accurate emissions reporting. While some failures are unavoidable, many outages can be prevented through proactive maintenance, routine inspections, strategic upgrades, and proper spare parts management. Why Minimizing CEMS Downtime Matters Every hour of CEMS downtime creates challenges for environmental teams, operations personnel, and compliance managers. Extended outages can result in lost emissions data, increased reliance on substitute data procedures, delayed reporting, unplanned maintenance costs, and heightened risk of permit deviations or regulatory scrutiny. The most effective approach is identifying potential issues before they impact system performance. Common Causes of CEMS Downtime Many CEMS failures originate from a small number of system components that experience continuous exposure to harsh operating conditions. Sample Extraction System Issues The sample extraction system serves as the first line of defense in obtaining a representative emissions sample. Damaged or corroded stingers, plugged sample ports or flanges, worn or leaking gaskets, and restricted sample flow are the most common failure points. Even minor leaks can introduce ambient air into the sample stream, resulting in inaccurate readings and unnecessary troubleshooting. Umbilical Problems The umbilical transports the sample from the stack to the analyzer and is critical to maintaining sample integrity. Leaks, loose fittings, heater failures, condensation buildup, and internal contamination or blockages are all common causes of failure. Routine inspections can identify developing issues before they impact analyzer performance. Sample Conditioning System Failures Sample conditioning equipment ensures analyzers receive a clean, dry sample. Worn or clogged pumps, dirty filters, moisture carryover, and faulty slip sensors are the primary failure modes. Because these components operate continuously, preventative maintenance is often far less costly than emergency repairs. Instrument Air and Cleanup System Problems Air cleanup systems support analyzer performance by providing clean, dry instrument air. Filter condition, scrubber media degradation, CO₂ scrubber effectiveness, and nitrogen generator performance all require routine attention. Failure in any of these areas can impact calibration accuracy and overall analyzer reliability. Analyzer Component Degradation Over time, analyzer components naturally wear and drift out of specification. Common maintenance items include NOx analyzer converters and scrubbers, SO₂ analyzer reaction chambers and optics, CO and CO₂ optical components, flow monitor sensors and purge systems, and opacity monitor lenses and filters. Regular inspections help identify declining performance before a failure occurs. Proactive Maintenance Strategies That Reduce Downtime The most reliable CEMS programs focus on prevention rather than reaction. Establishing a Preventative Maintenance Schedule Routine inspections and scheduled maintenance activities help identify wear before it results in failure. A preventative maintenance program should cover analyzer inspections, filter replacement, leak checks, calibration verification, flow system inspections, and instrument air system evaluations. Maintaining Critical Spare Parts Waiting for replacement components during an outage can significantly extend downtime. Facilities should maintain an inventory of commonly replaced items including pumps, filters, O-rings and gaskets, solenoid valves, sensors, and analyzer consumables. Inventory decisions should account for component lead times, system criticality, and historical failure rates. Performing Regular System Health Assessments Periodic evaluations help identify aging equipment and developing reliability concerns before failures occur. A comprehensive assessment should review analyzer performance trends, calibration stability, maintenance history, data availability, and component lifecycle status. Partnering with Experienced CEMS Field Service Providers Managing a CEMS program requires specialized technical expertise across analyzers, sample systems, data acquisition systems, and regulatory requirements. Working with experienced field service technicians helps facilities reduce unplanned downtime, improve system reliability, identify upgrade opportunities, maintain compliance readiness, and extend equipment life. Regular inspections, preventative maintenance, and strategic upgrades can significantly reduce downtime while helping facilities maintain confidence in their emissions data. How Alliance Supports CEMS Reliability Alliance Technical Group provides comprehensive CEMS field services designed to help facilities maximize uptime and maintain compliance. Our technicians support facilities with preventative maintenance programs, analyzer troubleshooting and repair, CEMS audits and assessments, system upgrades and retrofits, calibration and QA/QC support, spare parts recommendations, and emergency field service support. Whether you're addressing recurring maintenance issues or planning for long-term system reliability, our team can help you develop a strategy that minimizes downtime and keeps your CEMS operating at peak performance.

Are you ready for the new RICE Rule Electronic Reporting requirements?

On March 12, 2025 , U.S. Environmental Protection Agency (EPA) Administrator Lee Zeldin announced as the "greatest and most consequential day of deregulation in the history of the United States" . This initiative involves 31 actions aimed at reconsidering and potentially rolling back numerous environmental regulations. The stated goals of these actions are to unleash American energy, lower the cost of living for American families, revitalize the American auto industry, restore the rule of law, and give power back to the states . Key Areas of Regulatory Reconsideration: Administrator Zeldin highlighted several critical areas where changes are being pursued. These are likely to have significant implications for various industries: Energy Sector:  Clean Power Plan 2.0:  Reconsideration of regulations on power plants that aimed to shift the nation's electrical fuel mix. The goal is to ensure affordable and reliable electricity. Mercury and Air Toxics Standards (MATS):  Review of regulations that targeted coal-fired power plants. The administration aims to avoid shutting down affordable energy sources. OOOO b/c Regulations:  Reconsideration of rules affecting the oil and gas industry. The focus is on energy production and reducing burdens on producers. Greenhouse Gas Reporting Program (GHGRP):  Review of the mandatory program requiring emissions reporting, with the aim of reducing costs for businesses. Effluent Limitations Guidelines (ELG):  Reconsideration of water pollution limits for coal power plants and wastewater regulations for oil and gas extraction to lower energy costs and support water reuse. Risk Management Program (RMP) Rule:  Review of the rule for oil and natural gas refineries and chemical facilities, citing concerns about national security and competitiveness. Transportation Sector:  Light-Duty, Medium-Duty, and Heavy-Duty Vehicle Regulations:  Reconsideration of rules that formed the basis for the prior administration's electric vehicle standards, aiming to preserve consumer choice and affordability. 2009 Endangerment Finding:  Review of the finding that greenhouse gases are pollutants. Manufacturing and Other Industries:  Technology Transition Rule:  Reconsideration of rules forcing the use of specific technologies for refrigerant systems, impacting grocery stores and semiconductor manufacturing. Particulate Matter National Ambient Air Quality Standards (PM 2.5 NAAQS):  Review of standards that the administration believes have hindered manufacturing and small businesses. National Emission Standards for Hazardous Air Pollutants (NESHAPs):  Reconsideration of multiple air pollution standards affecting various sectors, including chemical manufacturing, sterilization facilities, rubber tire manufacturing, copper smelting, iron and steel manufacturing, lime manufacturing, coke ovens, and taconite ore processing. The administration is considering a 2-year compliance exemption  for affected facilities while the rulemaking proceeds. Water Regulations:  Waters of the United States (WOTUS) Rule:  Revision of the definition to provide clearer and simpler direction to farmers, landowners, businesses, and states, following the Supreme Court ruling in Sackett v. Environmental Protection Agency . The revised definition will focus on relatively permanent, standing or continuously flowing bodies of water and wetlands with a continuous surface connection to those waters. Air Quality Planning and Permitting:  "Good Neighbor Plan":  Reconsideration of the plan to address interstate transport of air pollution, aiming to advance cooperative federalism and work with states on their State Implementation Plans (SIPs). State and Tribal Implementation Plans (SIPs/TIPs):  Commitment to resolving the backlog of unresolved SIPs/TIPs from the previous administration. Exceptional Events Rulemaking:  Review to prioritize the allowance of prescribed fires within State and Tribal Implementation Plans for better forest management. Other Areas:  "Social Cost of Carbon":  Overhauling the measurement used to assess the economic damages of carbon emissions, which the administration views as contributing to significant regulatory costs. Enforcement Discretion:  Redirecting enforcement resources to focus on the EPA's core mission and avoid actions that discriminate based on race or socioeconomic status or shut down energy production. Termination of Environmental Justice and DEI Arms:  Ending the Environmental Justice and Diversity, Equity, and Inclusion arms of the agency. Reconstituting Science Advisory Boards:  Reestablishing the Science Advisory Board (SAB) and Clean Air Scientific Advisory Committee (CASAC) to ensure independent scientific advice. Coal Ash Program:  Prioritizing the program to expedite state permit reviews and update coal ash regulations. Hurricane Recovery:  Utilizing enforcement discretion to further North Carolina’s recovery from Hurricane Helene. Potential Timelines and Considerations: While these announcements signal a clear intention to move forward with deregulation, it is important to note that the actual implementation of these changes will likely take time. The process will involve formal rulemaking, including proposing rule changes, conducting public hearings, and addressing public comments. These processes can be lengthy and may face legal challenges. External analysis suggests that implementing many of these rollbacks could take years  and face difficult legal battles , especially in light of recent Supreme Court decisions. We will continue to monitor these developments closely and provide updates on the specific timelines and details of these regulatory changes as they become available. Please do not hesitate to reach out if you have any questions about how these potential changes may affect your business. Sources: EPA Approves State of Texas Plan to Improve Air Quality in San Antonio Area EPA Will Revise Wastewater Regulations for Oil and Gas Extraction to Help Unleash American Energy (ELGs: Oil and Gas) EPA Announces Action to Implement POTUS’s Termination of Biden-Harris Electric Vehicle Mandate Trump EPA Announces Reconsideration of Burdensome Greenhouse Gas Reporting Program Trump EPA Kicks Off Formal Reconsideration of Endangerment Finding with Agency Partners Administrator Zeldin Begins Restructuring Regional Haze Program Administrator Zeldin Takes Action to Decrease Risk of Future Catastrophic Wildfires (“Exceptional Events”) EPA Announces Action to Address Costly Obama, Biden “Climate” Measurements (Social Cost of Carbon) EPA Announces Swift Actions on Coal Ash Program (Coal Combustion Residuals) Trump EPA to Reconsider Biden-Harris MATS Regulation That Targeted Coal-Fired Power Plants to be Shut Down Trump EPA Announces OOOO b/c Reconsideration of Biden-Harris Rules Strangling American Energy Producers Trump EPA Announces Reconsideration of Air Rules Regulating American Energy, Manufacturing, Chemical Sectors (NESHAPs) Administrator Zeldin Takes Action to Prioritize Cooperative Federalism, Improve Air Quality Faster EPA Helps NJ and NY Businesses and Municipalities Meet Environmental Goals Trump EPA Announces Reconsideration of Biden-Harris Rule, “Clean Power Plan 2.0”, That Prioritized Shutting Down Power Plants While Raising Costs on American Families Administrator Zeldin Directs Enforcement Resources to Align with Executive Orders and EPA’s Core Mission EPA Announces Reconsideration of the Risk Management Plan to Boost Safety, Competitiveness of American Businesses Trump EPA Takes Action to Lower Costs for American Families at the Grocery Store by Reconsidering Burdensome Technology Transition Rule EPA to Accept Nominations for Science Boards EPA Terminates Biden’s Environmental Justice, DEI Arms of Agency Trump EPA Announces Path Forward on National Air Quality Standards for Particulate Matter (PM2.5) to Aid Manufacturing, Small Businesses Trump EPA Announces Use of Enforcement Discretion to Further North Carolina’s Recovery from Hurricane Helene Administrator Zeldin Announces EPA Will Revise Waters of the United States Rule EPA Launches Biggest Deregulatory Action in U.S. History Trump EPA Announces Plan to Work with States on SIPs to Improve Air Quality and Reconsider “Good Neighbor Plan” EPA Announces It Will Reconsider 2024 Water Pollution Limits for Coal Power Plants to Help Unleash American Energy (ELG: Steam Electric)

Alliance Technical Group is proud to be Certified™ by Great Place To Work®. This prestigious award is based entirely on what current employees say about their experiences, and the Alliance team had some great insights.  Great Place To Work® is the global authority on workplace culture, employee experience, and the leadership culture proven to deliver market-leading revenue, employee retention, and increased innovation.  “We are excited about the continued positive momentum evidenced by receiving this award. Our employees work hard for our clients and for each other,” says Chris LeMay, CEO of Alliance Technical Group. “Creating a great workplace is a top priority for leadership. We celebrate this achievement and will keep working to make Alliance an exceptional place for both employees and clients.”  "Great Place To Work Certification is a highly coveted achievement that requires consistent and intentional dedication to the overall employee experience," says Sarah Lewis-Kulin, the Vice President of Global Recognition at Great Place To Work. She emphasizes that Certification is the sole official recognition earned by the real-time feedback of employees regarding their company culture. “By successfully earning this recognition, it is evident that Alliance stands out as one of the top companies to work for, providing a great workplace environment for its employees."  Great Place To Work Certification is recognized worldwide by employees and employers alike and is the global benchmark for identifying and recognizing outstanding employee experience.  According to Great Place To Work research , job seekers are 4.5 times more likely to find a great boss at a Certified great workplace. Additionally, employees at Certified workplaces are 93% more likely to look forward to coming to work, and are twice as likely to be paid fairly, earn a fair share of the company’s profits and have a fair chance at promotion.  Alliance Technical Group is a leading environmental services company, offering our clients testing and monitoring services, analytical services, consulting, and technology solutions across the U.S. and Canada. We are experiencing a period of rapid growth, and that means plenty of exciting opportunities for you. Here, you'll use your creativity and talent to identify new solutions, support our clients' requirements, and offer the industry's most effective methods to protect the environment. By joining the team, you can help improve our world today and for future generations – while creating an exciting career of your own. View current opportunities here.     About Great Place To Work ® As the global authority on workplace culture, Great Place To Work® brings 30 years of groundbreaking research and data to help every place become a great place to work for all. Their proprietary platform and For All™ Model helps companies evaluate the experience of every employee, with exemplary workplaces becoming Great Place To Work Certified™ or receiving recognition on a coveted Best Workplaces™ List. Learn more at greatplacetowork.com  and follow Great Place To Work on LinkedIn , Twitter , Facebook and Instagram .

Regulations are evolving fast. Federal, state, and local agencies are constantly refining compliance requirements, making it harder for businesses to keep up. In this shifting landscape, waiting to react isn’t an option – proactive compliance is key. Why Staying Ahead Matters Regulations Keep Changing – Are You Keeping Up? Environmental compliance isn’t just about following the law; it’s a moving target. While federal updates make headlines, state-level rules often bring even stricter mandates. Staying ahead means keeping a pulse on both legislative trends and enforcement priorities. Non-Compliance Costs More Than Fines Financial penalties are just the start. Regulatory missteps can damage your reputation, disrupt operations, and attract unwanted scrutiny from regulators, stakeholders, and the public. Environmental Data Can Drive Business Decisions Beyond compliance, environmental testing provides insights that help optimize operations, improve efficiency, and support sustainability—all while keeping you on the right side of regulations. Compliance and Sustainability Go Hand in Hand For companies focused on sustainability, compliance isn’t just a box to check—it’s a key part of corporate responsibility. A strong compliance strategy supports sustainability goals, builds community trust, and strengthens long-term resilience. The Need for a Strategic Approach Compliance isn’t just about avoiding penalties – it’s about integrating environmental performance into your business strategy. That takes expertise, accurate data, and a proactive mindset.   With a tailored, all-inclusive approach unique to each client, Alliance works collaboratively to solve every environmental challenge with a full suite of services for: Regulatory Insight & Compliance Strategy Comprehensive Environmental Testing & Monitoring Continuous Emissions Monitoring Laboratory Testing Smart Technology & Sustainability Support   As a trusted environmental industry advisor with a staff of over 1,800 dedicated professionals, we’re bringing the expertise, technology, and support clients need to stay ahead in a rapidly changing regulatory landscape.   How’s your company adapting?

Decatur, AL – February 10, 2025  – Alliance Technical Group (Alliance) has received two EBJ Business Achievement Awards in honor of outstanding environmental industry successes in Mergers & Acquisitions and Project Merit . The EBJ Business Achievement Awards is hosted annually by the Environmental Business Journal® (EBJ), an independent business research publication that provides strategic market intelligence to the environmental industry.   Mergers & Acquisitions Alliance made 11 strategic acquisitions in 2024, including ORTECH Consulting, RSB Environmental, Airtech Environmental Laboratories, Advanced Industrial Resources, CEMSI, Integrity Air Monitoring, Rogers & Callcott, CEMServices, Ranger Analytics, Gas Ops Leak Detectives, and DeNovo Global Technologies.  These transactions reinforced Alliance’s position as a market leader in environmental compliance, on-site testing and monitoring, and laboratory testing services. Each acquisition aligned with Alliance’s strategic goals of expanding its geographic reach, enhancing service offerings, and fostering operational growth.   Project Merit  Alliance’s strong partnership with Renewable Natural Gas (RNG) clients was instrumental in the successful commissioning of more than 14 new RNG facilities in 2024. Working with clients to ensure gas quality specifications were met during plant startup, Alliance provided timely testing, customized reporting, and unwavering support throughout the process.  Understanding the time-sensitive need for accurate and expedited results to support commissioning teams, Alliance remained responsive to the challenges inherent in these processes. The company’s equipment and nationwide internal laboratory network improves turnaround times and provides overflow resources, prioritizing high-impact, time-critical projects, helping clients achieve and maintain pipeline readiness.  “We are honored to have been recognized for our team’s hard work, growth, and deep commitment to excellence,” said Chris LeMay, CEO of Alliance. “As we continue to grow geographically and enhance our service offerings, we look forward to continually serving clients with the highest quality service.”

DECATUR, Alabama, Jan. 13, 2025 – Alliance Technical Group LLC, a leader in environmental compliance, on-site testing and monitoring, and laboratory testing and analysis, continues its strategic expansion as it announces the acquisitions of DeNovo Global Technologies, Inc 's air testing division, Gas Ops Leak Detectives, LLC (GOLD) and a merger with Ranger Analytics Inc. DeNovo is a Texas-based company that specializes in advanced environmental monitoring solutions and offers state-of-the-art technologies for accurate data collection and analysis. GOLD is renowned for its expertise in leak detection and repair (LDAR) services, including extensive optical gas imaging (OGI) capabilities, and for providing quality and affordable compliance solutions to clients in the oil and gas industry. GOLD is a Colorado-based company that currently services nine states spanning from the Rocky Mountains to the Southern Plains, adding to the geographical depth of Alliance's services. Ranger Analytics is a full-service, Texas-based analyzer and gas detection systems company, serving industrial, air-quality, and maritime markets with mobile emissions, continuous emissions monitoring systems (CEMS), and gas detection services. "Adding these companies to the Alliance family builds on our 25 years of environmental leadership," said Chris LeMay, CEO of Alliance Technical Group. "Each brings unique expertise that complements our current service offerings and expands our reach to new markets. These additions continue Alliance's rapid growth trajectory while maintaining the best-in-class response and quality standards we've established over the past quarter century.”

A Relative Accuracy Test Audit (RATA) is a field audit that validates the accuracy of your Continuous Emissions Monitoring System (CEMS) by comparing its data against reference method measurements taken simultaneously by certified stack testers. It answers one fundamental question: is your CEMS producing data that accurately represents actual emissions? Unlike a cylinder gas audit (CGA), which tests your analyzers with known-concentration gases, a RATA tests the entire CEMS — from probe to data output — against independent measurements at the stack. The results determine whether your system is in control and whether your compliance data can be used. A failed RATA means your CEMS is out-of-control, your data becomes invalid, and you’re looking at out-of-control periods, substitution data, and significant reporting headaches. A missed RATA — one that wasn’t scheduled, notified, or conducted at the right load level — can be just as costly. Getting a RATA right is not complicated, but it requires systematic preparation. This guide covers what a RATA is, which regulations govern it, and exactly what to do before, during, and after your test. When Is a RATA Required? Part 60 vs. Part 75 RATA requirements differ depending on which regulation governs your facility. Many facilities are subject to both, which creates additional complexity. Use the table below to identify what applies to you. 40 CFR Part 75 40 CFR Part 60 (Appendix F, Procedure 1) Dual Compliance Note Applies To Electric generating units (EGUs) under Acid Rain Program, CSAPR, and related NOx programs Broader range of stationary sources: industrial boilers, cement kilns, glass furnaces, chemical plants, and others subject to NSPS Many facilities use the same CEMS to satisfy both. Title V permits often specify that a Part 75-compliant RATA satisfies Part 60 requirements — verify this in your permit. Pollutants SO₂, NOₓ, CO₂, O₂, volumetric flow Varies by subpart: SO₂, NOₓ, CO₂, O₂, CO, PM, VOCs, HAPs Confirm pollutant-specific requirements in your applicable subpart and permit. RATA Frequency At least once every four QA operating quarters (each with ≥168 operating hours); annually for flow monitors At least once every four calendar quarters; successive audits no closer than 2 months apart QA operating quarters (Part 75) vs. calendar quarters (Part 60) can create different scheduling obligations. Load Requirements Gas RATAs: at the normal or next-normal load level. Flow RATAs: at each of three load levels every 5 years, separated by ≥25% of operating range At normal operating conditions as defined by the applicable subpart Load level errors are among the most common RATA mistakes — and are usually discovered after the test. Minimum Runs 9 runs minimum; 10 recommended Per applicable Performance Specification in Appendix B More runs give you more data to bring RA down if early results are trending high. Advance Notice At least 21 days to EPA and state agency, unless exempt under §75.61(a) Per permit or state requirements — varies by jurisdiction Check your permit and local agency requirements. Missing notification deadlines can invalidate a RATA. Key Regulatory References Appendix A, §§3.3 and 6.5 Appendix B, §2.3.1 Part 75 Policy Manual, Section 8 Appendix F – Procedure 1, §5.1 Appendix B Performance Specifications: PS-2 (SO₂ & NOₓ), PS-3 (O₂ & CO₂), PS-4 (CO) If your facility is subject to both Part 75 and Part 60, review your Title V Operating Permit carefully. It will typically specify whether satisfying Part 75 RATA standards also satisfies Part 60 — but this must be explicitly stated. If it is not, confirm with your state or local regulatory authority before conducting a combined test. Before the RATA: Pre-Test Planning Checklist Most RATA problems originate before the test even begins. Poor scheduling, wrong load levels, inadequate notification, or equipment that hasn’t been serviced are all avoidable with a structured pre-RATA checklist. 1. Determine When Your RATA Is Due Review your facility’s in-house RATA procedures and your Title V permit for applicable frequency requirements Generate a QA Test Status Report from your DAS to confirm where you stand in your current QA cycle Cross-check Part 75 QA operating quarters vs. Part 60 calendar quarters if both apply 2. Verify Operating Quarters Each of the last four QA operating quarters must have at least 168 operating hours for Part 75 Confirm the unit will be operating during the planned test window at appropriate load levels 3. Identify the Correct Load Level Load level errors are one of the most common — and most costly — RATA mistakes. They are typically discovered after the test has been conducted, resulting in invalid data and the need to retest. Gas RATAs must be performed at the normal load level (highest percentage of operating hours in the last four quarters), or the next-normal load if the unit cannot operate at normal load for economic reasons Flow RATAs must be conducted at each of three load ranges every five years, with each range separated by at least 25% of the operating range Perform a load analysis before scheduling to confirm the correct operating level — do not rely on assumptions from the previous RATA cycle 4. Schedule Testing and Submit Notifications Schedule your stack testing contractor well in advance — weeks to months, depending on your testing window and contractor availability Submit written notification to EPA and applicable state agencies at least 21 days before the test date under Part 75, unless your facility qualifies for an exemption under §75.61(a) Verify state or local notification requirements, which may differ from or exceed federal requirements Confirm the notification includes the correct unit, stack, pollutant(s), and intended test date 5. Verify Stack Tester Qualifications This step is frequently overlooked but carries real compliance implications. EPA requires that a “Qualified Individual” be present during RATA testing. For many source categories, this means your stack testing contractor must hold current Air Emissions Testing Body (AETB) certification. Confirm AETB certification when issuing your RFP and before the contractor arrives on site Verify that the individual who will be on site holds the certification, not just the firm Include certification requirements explicitly in your testing contracts 6. Service All CEMS Equipment Before the Test Complete any scheduled maintenance, calibration, or repairs before the test window — do not leave these for the week of the test Verify all analyzers are operating within calibration drift limits Check probe, filter, and umbilical condition; replace or clean as needed Confirm your DAS is configured correctly and that all CEMS parameters are being logged as expected Day of the RATA: What to Do During Testing By the time test day arrives, most of the variables should already be controlled. Day-of execution is about maintaining stable operating conditions, staying engaged with the testing team, and catching problems early enough to act on them. 1. Establish and Maintain Stable Operating Conditions Operate at the correct load level as determined in your pre-RATA planning — stable and consistent, at 90% or more of maximum load if that is your normal range Ensure all pollution control equipment is running in its normal operational state Avoid process changes, cleanings, or adjustments during the test window 2. Confirm Sampling Points Before Testing Begins A stratification test is required under Part 75 Appendix A §§6.5.5–6.5.6.1 to determine appropriate sampling points Flow RATAs require traverse points selected per Part 75 Appendix A and Method 1 under Part 60 Confirm sampling locations with the stack testing team before runs begin — disputes about sampling points mid-test create delays and can compromise results 3. Communicate Actively with the Stack Testing Team Be on site and accessible throughout testing — do not leave the stack testing team to operate without facility personnel present Review and compare results with the stack testers every 2–3 runs After 6–7 completed runs, evaluate whether your relative accuracy is trending toward passing or whether additional runs are advisable Part 75 requires a minimum of 9 runs; running 10 provides additional data that can help bring RA below the 7.5% threshold if early runs are running high 4. Monitor CEMS Performance Throughout Watch for calibration drift, analyzer alarms, or data gaps in real time during the test Document any anomalies, equipment events, or operational changes that occur during the test window — your DAS should be capturing all of this automatically, but manual notes provide additional context If a significant equipment issue arises mid-test, consult with your regulatory contact before deciding whether to continue or reschedule After the RATA: Post-Test Requirements The test is not complete when the stack testers leave the site. Post-RATA steps are where documentation, data entry, and DAS updates take place — and where errors can still compromise an otherwise successful test. 1. Review Test Results and Documentation Review the stack tester’s results and compare them against your CEMS data before the testers leave the site if at all possible Identify and resolve any discrepancies with the testing contractor while they are still on site Confirm that all required runs are documented, that sampling points are correct, and that the test was conducted at the appropriate load level 2. Enter RATA Results in Your DAS Enter all RATA results into your DAS accurately and promptly Confirm that the DAS is correctly recording the RATA as a QA certification event Verify that the applicable out-of-control flags are cleared once the RATA passes 3. Submit Updated Monitoring Plan (If Required) If the RATA requires changes to your monitoring plan — new load level ranges, updated sampling point definitions, or modified calculation methods — update and resubmit the monitoring plan before your next quarterly submission For Part 75 facilities, monitoring plan changes must be submitted via ECMPS before the quarter in which the change takes effect 4. Include RATA Results in Your Quarterly Submission RATA results must be included in your QA file for the quarter in which the test was conducted Do not wait until the submission deadline to verify that your RATA data is correctly captured in your electronic data report (EDR) — generate and review your QA file as soon as results are entered If the RATA resulted in an out-of-control period, confirm that substitution data is correctly applied for the relevant period in your quarterly submission 5. What to Do If Your RATA Fails A failed RATA means your CEMS is out-of-control from the time of the most recent prior passing test. Out-of-control data cannot be used for compliance and must be replaced with substitute data per your applicable regulation. Take corrective action on your CEMS — diagnose the root cause of the accuracy failure before retesting Following corrective action, a RATA must be used to return the system to in-control status — a CGA or RAA is not sufficient to close an out-of-control period triggered by a failed RATA Document the out-of-control period, the corrective actions taken, and the results of the retest Apply substitute data for the full out-of-control period in your quarterly submission per Part 60 or Part 75 substitution methodology Need Support for Your Next RATA? Alliance Technical Group's field service and regulatory teams work with facilities across industries to prepare for, conduct, and document RATAs under Part 60, Part 75, and applicable state programs. Our technicians support CEMS-side RATA execution — ensuring your analyzers are operating correctly, calibrations are current, and the system is ready before reference method testing begins. From pre-RATA load analysis and notification support through post-test DAS entry and quarterly submission review, we help facilities navigate the full RATA process without compliance exposure. Our StackVision DAS and 8864 Data Controller collect, monitor, QA, and report on RATA data in real time — so you have full visibility into results as testing progresses and a clean, audit-ready record when it's done. There's a better way to manage your RATA.

Decatur, AL – November 8, 2024 – Alliance Technical Group, the premier leader in environmental compliance, on-site testing and monitoring, and laboratory testing and analysis, announces the acquisition of CEMServices, Inc. Since 1992, CEMServices, Inc., located in Norton, Massachusetts, has provided consistent, reliable stack testing and continuous emissions monitoring systems (CEMS) services across New England and the Mid-Atlantic. With a strong client base across nine states and over 30 years of delivering exceptional value, CEMServices is known for its experienced team and deep regional expertise. “We are very excited to join Alliance Technical Group,” said Chris Cutting, Founder and President of CEMServices. “The resources and technical expertise at Alliance will allow us to support our clients with improved responsiveness, new technologies, and an expanded service offering. Our clients can now benefit from Alliance's advanced solutions and commitment to excellence.” The acquisition of CEMServices not only strengthens Alliance’s geographical footprint in the Northeast and Mid-Atlantic regions but also adds 20 experienced professionals to Alliance’s team. This addition enhances our temporary CEMS offerings and strengthens multiple service lines, including stack testing, CEMS maintenance, and CEMS auditing. This acquisition marks Alliance’s sixth in 2024 and underscores our commitment to providing unparalleled service and technical expertise across the United States. “The acquisition of CEMServices deepens our client base and grows our on-site testing and monitoring team in two strategic growth regions,” said Chris LeMay, CEO of Alliance Technical Group. “We are excited to integrate technical professionals with extensive knowledge into our industry-leading teams, further enabling us to meet the evolving needs of our clients.” About Alliance Technical Group: Alliance Technical Group, LLC (Alliance), headquartered in Decatur, AL, is the premier environmental services and solutions company dedicated to helping clients achieve their environmental goals and navigate regulatory changes. With more than 1,700 employees located in 50-plus offices across the U.S. and Canada, Alliance specializes in Environmental Compliance, On-site Testing and Monitoring, and Laboratory Testing and Analysis. Driven by innovation, committed to service, and focused on client success, Alliance delivers on the promise of reliability, results, and responsiveness. Learn more about how we help clients maximize their environmental opportunities at www.alliancetg.com.

Optical Gas Imaging Game-Changer Real-Time Field Data Transforms OGI Operations  Alliance’s SkyBridge OGI Software is a cloud-based SaaS solution that makes the job of collecting, managing, and reporting real-time OGI field data lightspeed faster, effortlessly automated, and accessible anywhere with an internet signal. 10 Benefits of SkyBridge OGI Software Automate Reporting Generate accurate compliance reports including CEDRI effortlessly. Reduce Work Hours Collect and manage field-data instantly, freeing up countless hours. Minimize Overhead Handle site inspections, leaks, repairs, and re-inspections centrally. Manage Efficiently Empower operators to better oversee their teams and field performance. Improve Media Document everything clearly with improved in-app imaging and uploading. Increase Safety Safeguard technicians in the field with real-time location tracking. Synchronize Data Automatically create accuracy and availability on web and mobile. Reduce Costs Eliminate the need for paper logs, internal servers, data backups, and upgrades. Stay Informed Receive instant leak notifications, survey reminders, and more via email. Secure Data Store and protect all your data on Microsoft’s Azure network. SkyBridge OGI Software gives you better OGI control while removing your day-to-day system management challenges and skyrocketing productivity and time savings. OGI Testing and Monitoring Field Services Our Optical Gas Imaging (OGI) services are designed to detect and visualize gas leaks quickly and accurately with our state-of-the-art FLIR cameras. Paired with our SkyBridge OGI Software, we help you streamline the detection process, enhance efficiency, and ensure regulatory compliance. See Your Own Simulated Demo Get a confidential, customized demo of how SkyBridge OGI will transform your CEDRI reporting process and make every field data collection and management task lighting fast, secure, and accurate.

During Earth Month, Alliance Technical Group honors our industry partners dedicated to environmentally responsible practices that generate jobs, career paths, and wealth while safeguarding our planet's well-being. America's aluminum recycling is a true success story, with over 75% of our aluminum now coming from recycled sources. With 400+ secondary aluminum plants nationwide, this thriving industry contributes over $70 billion yearly, supports over 630,000 jobs, and reduces pollution by 95% compared to traditional methods. It’s an achievement we can all be proud of! Alliance Technical Group has a proud history of providing emissions testing, monitoring, laboratory, and engineering services to the secondary aluminum industry. These facilities invest heavily in advanced pollution control systems to comply with stringent environmental standards. We are pleased to play a role in ensuring their systems function effectively, safeguarding human health and the environment. Strong, lightweight, and used in hundreds of specialty alloys, aluminum is a key raw material crucial to the automotive, aerospace, appliance, and beverage industries, to name but a few. Alliance is excited to continue our partnership in the aluminum industry. Washington Monument's tip is made of aluminum, chosen for its rarity and exotic status in 1884. This symbolized American prestige, honoring George Washington with a then-luxurious metal. The advent of the Hall-Héroult process in 1886 revolutionized aluminum production, rapidly shifting it from one of the most expensive to one of the cheapest metals.

Safety isn’t just a protocol—it’s a promise. Amid the complexities of modern industries, the health and safety of workers remain paramount. It's not merely about compliance; it's a profound understanding of the integral role that Industrial Hygiene Services (IHS) play in ensuring a risk-free environment. Prioritizing Proactivity Historically, many industries waited for incidents to occur before implementing safety measures. That reactionary approach is no longer tenable. IHS exemplifies the new ethos of preventing rather than just responding. This proactivity is manifested in two essential ways: Continuous Monitoring : Through rigorous assessments, including air quality tests and ergonomic evaluations, IHS consistently identifies potential hazards, offering a full understanding of both apparent and latent challenges. Data-Driven Insights : Today’s IHS harnesses data analytics. Instead of just recording, data is used to predict and strategize, transforming raw figures into actionable safety plans. Human-Centric Safety Behind each safety protocol lies a human narrative. Every safety guideline and regulation shields an individual with hopes, dreams, and responsibilities. Beyond Mere Compliance : While regulations are non-negotiable, IHS goes a step further, focusing on the holistic well-being of every worker. This means not just fulfilling what's legally required, but also prioritizing what’s morally right, ensuring each worker feels protected and valued. Building Trust : A trusted environment is the cornerstone of any productive workspace. By showing genuine concern for employees' well-being, industries don't just enhance safety; they foster a sense of loyalty, boosting morale and productivity. Innovative Approaches to Technology Innovation is at the heart of modern IHS. With advancements in technology, we are now privy to cutting-edge equipment and methodologies that offer deeper insights into workplace safety. State-of-the-Art Monitoring : Equipment providing real-time feedback, like air quality sensors, ensures risks are identified and mitigated promptly. Wearable Tech : Devices tracking physiological indicators offer insights into workers’ well-being, from stress levels to potential health threats. Implementing Actionable Safety Measures For industries aiming to integrate safety holistically: Continuous Learning : Stay ahead by ensuring safety protocols evolve with the times. Training sessions and workshops will reinforce a safety-first mindset. Harness Technology : Embrace the latest in safety tech, from advanced monitoring equipment to data analytics tools. Collaboration with Experts : Partnering with professional IHS providers can bring invaluable expertise and perspective to the table. Feedback is Crucial : Employees, being on the front lines, offer valuable insights. Fostering a culture where they can freely express safety concerns and suggestions is paramount. At the crux of Industrial Hygiene Services lies its commitment to every worker's well-being. By integrating professional insights, advanced technology, and a touch of humanity, industries can pave the way for a brighter, safer future.

Environmental consciousness isn't just a trend; it's a core principle shaping industrial strategies and policies. Environmental Risk Assessment (ERA) has evolved from being a mere regulatory checkpoint to a crucial instrument driving industries forward. As environmental consciousness takes center stage, ERA has emerged as a transformational tool for industries. Let's delve into how it refines operations, yields better outcomes, and enables sustainable growth. Recognizing the Imperative: More Than Just Compliance Understanding the vast landscape of industrial environmental risks is essential. A comprehensive risk assessment provides a holistic insight that spans the entire lifecycle of a product or service, revealing hidden vulnerabilities. This approach is not just about meeting standards; it involves integrating ERA into daily procedures to enhance responsiveness. It creates operational seamlessness and ensures alignment with local and international environmental standards. The process doesn't stop at merely identifying these risks; it's about creating adaptive strategies, building plans that can adjust to emerging threats and opportunities, and ensuring that solutions are both measurable and sustainable. Stepping Up the Game: The Strategic Advantage of ERA A robust ERA process is about much more than ticking off regulatory checkboxes. It's about tapping into diverse expertise, benefitting from various perspectives to enrich the understanding of risks. The application of modern tools and methodologies bolsters ERA's precision, creating a tech-driven efficiency that transforms the approach from reactive to proactive. Continual learning is vital, with industries needing to stay updated to address ever-evolving environmental challenges. This multifaceted approach helps transform ERA from a necessary evil to a strategic advantage, placing it at the core of industry innovation. Beyond Theoretical Constructs: Making ERA Matter ERA's effectiveness multiplies when applied practically and across the entire industry. Building bridges with regulators ensures alignment with the evolving landscape of environmental laws. Collaboration extends further to sourcing responsibly, working with suppliers to create a sustainable supply chain that enhances the entire product life cycle. It also involves educating partners, clients, and the wider community, keeping them informed and involved in environmental stewardship. But ERA isn’t just about building bridges and collaborating; it’s about translating risk assessment from paper to practice. This involves setting up consistent monitoring, empowering the workforce with environmental consciousness, and using feedback to continually refine risk strategies and protocols. Wrapping Up: A Vision for the Future Environmental risk assessment is not a static or one-off task; it's a dynamic process that forms the bridge between today's challenges and tomorrow's sustainable successes. By embedding ERA within industrial processes, there's a potential to unlock unprecedented avenues of growth, innovation, and resilience. It's not just about mitigating risks; it's about leveraging them to pave the way towards a future where both business and nature thrive. With ERA as a cornerstone, industries can chart a course that balances operational excellence with environmental stewardship, offering a vision of a world where industrial success and environmental responsibility are not conflicting goals but complementary achievements.

Alliance, in association with Teledyne FLIR, is thrilled to invite you to the Optical Gas Imaging and Leak Detection and Repair (LDAR) User Group Event, slated for: Wednesday, October 18 8:30am - 3:30pm MDT Loveland, Colorado Whether you are a seasoned OGI camera user or someone keen on exploring the burgeoning technology, this event promises a rich learning experience tailored just for you. Here’s a glimpse of what’s on the agenda: Understanding Regulatory Implications : Dive deep into the discussions on the regulations concerning OGI and how they are poised to impact users moving ahead. Review of Technological Upgrades : Get acquainted with the latest advancements in OGI camera technology that are making inspections more streamlined and conducive to meeting regulatory stipulations. Software Capabilities Unveiled : Discover new software enhancements aimed at helping operators fulfill LDAR reporting requirements. Fostering Open Dialogue : Engage in an open forum on the current and prospective state of OGI cameras and their position within the regulatory framework. A complimentary lunch will be served to all attendees. Stay tuned for more details on the agenda and the panel of speakers. While this event is complimentary, the seats are limited. Registration is necessary to secure your spot in this enlightening expedition into the realm of OGI and LDAR. Register Now (link inactive) Join Alliance and Teledyne FLIR to delve into the intricacies of OGI technology and network with industry trailblazers. Register now and mark your calendar for a day of insightful discussions, learning, and networking. The Alliance team, alongside Teledyne FLIR, are looking forward to hosting engaging discussions and forging meaningful connections. See you in Loveland on October 18th!