CLEVELAND and DALLAS, July 20, 2021 – Align Capital Partners (“ACP”) is pleased to announce the sale of its environmental testing and compliance platform Alliance Technical Group (“Alliance” or the “Company”) to Morgan Stanley Capital Partners (“MSCP”). Headquartered in Decatur, AL, Alliance is a leading provider of source testing, emissions monitoring and analytical services to customers throughout the United States. Since ACP’s initial 2016 investment, the Company has achieved transformational growth. During the partnership, ATG completed 11 acquisitions, expanded into four new service lines and grew its revenue by more than 600%. This rapid growth enabled the Company to expand from four locations in 2016 to more than 20 today, while increasing headcount from less than 75 employees to over 750 today. “Five years ago, we chose ACP as our growth partner because we believed they had the expertise and shared growth vision to help us achieve our goals,” said Alliance CEO Chris LeMay . “ACP is what we thought they would be – a great partner. They continuously supported our investments in people, process improvement and technology, enabling us to scale geographically and into new services, all while becoming an even better company for our employees and clients.” The Alliance growth story is a great example of ACP’s dedication to helping lower middle market business owners and management teams create shared success. The experienced investment team at ACP understands the core growth and operating needs of small companies. In partnership with management, Alliance expanded from a regional source testing business to a national operation with a full breadth of emission testing and monitoring solutions. “ACP exists to support strong management teams in their pursuit of ambitious growth goals. It’s been a pleasure to work alongside Chris LeMay and the entire Alliance team as they consistently achieved each milestone in their journey to become one of the best testing, inspection and compliance companies in the U.S.,” said ACP Managing Partner Rob Langley. “We are extremely grateful for the hard work and dedication of the entire team at Alliance, and very proud of the growth they’ve achieved during our partnership these last five years.” This transaction marks the first exit for ACP since closing its inaugural fund in 2016. Since that time, ACP has completed 13 platform investments and 38 add-on acquisitions of growth-oriented business services, tech-enabled services and specialty manufacturing and distribution companies. In addition to Alliance, ACP owns four other testing and compliance-oriented platforms, making the firm one of the most active lower middle market investors in the category. Operating Partner Dave Perotti , Principal Jack Parks , and Associate Chris Collins worked alongside Mr. Langley on the Alliance investment. Piper Sandler & Co. acted as financial advisor to Alliance and McGuireWoods LLP served as legal counsel to the Company. Proskauer Rose LLP served as legal counsel to MSCP. About Align Capital Partners Align Capital Partners is a growth-oriented private equity firm that partners with business owners and management teams to create shared success. ACP manages $775 million in committed capital with investment teams in Cleveland and Dallas. ACP brings experience and resources to help lower-middle market companies accelerate their growth, to the benefit of management, employees and the firm’s investors. ACP makes control investments in differentiated companies within the business services, technology, specialty manufacturing and distribution sectors. For more information, visit aligncp.com .

Alliance Technical Group, LLC (“Alliance”) completed its 12th add-on acquisition with the purchase of Horizon Air Measurement Services, Inc. (“Horizon”), located in Camarillo, CA.  Horizon provides stack testing services to customers throughout California and the Western United States. Acquiring Horizon adds to Alliance’s rapidly growing West Coast presence and increases resources necessary to continue the expansion of all Alliance service lines in the region. Richard Vacherot, Technical Director of Horizon Air Measurement Services, Inc. said, “We’ve worked with Alliance to put our employees on the same team and are very excited to achieve this goal.  The ability to offer the deeper bench and additional services that Alliance brings to the table will help us continue to service and grow our customer base.” Together, Alliance and Horizon have a national footprint with coast-to-coast offices and more than 750 employees, providing a deep bench of technical expertise across a diverse range of end markets. “Adding resources to our rapidly expanding West Coast operations was imperative, and Horizon delivers on both strategic and geographic fit,” noted Alliance CEO Chris LeMay.  “As Alliance continues to expand, we look to partner with high quality, customer-focused companies across all of our services lines.”

Alliance Technical Group, LLC (“Alliance”) completed its 11th add-on acquisition with the purchase of Air Quality Services (AQS).  AQS provides air-related environmental services including stack testing, continuous emissions monitoring (CEMS), and ambient air monitoring to customers throughout the central United States. Acquiring AQS is an important step for Alliance, which is actively building a national, best-in-class air emission testing, monitoring, and laboratory analysis platform.  AQS adds resources to the rapidly growing stack testing and ambient air monitoring groups as well as adds CEMS to Alliance’s comprehensive service offerings for its customers. Dan Todd , President of Air Quality Services said, “Becoming a part of the Alliance Technical Group expands our ability to provide ambient air monitoring and CEMS services to a vibrant and growing customer base.  Along with combining our stack testing services with the Alliance team, this opportunity allows our customers access to a nationwide network of experts and our employees access to new, exciting career opportunities.” Together, Alliance and AQS have a national footprint with coast-to-coast offices and more than 725 employees, providing a deep bench of technical expertise across a diverse range of end markets. “Strategically AQS fits from both a geographic and service offerings position for Alliance.   In addition to adding experienced stack testing and ambient air monitoring professionals, we are entering the CEMS market which allows us to provide our customers with services they have been asking us to include in our portfolio,” noted Alliance CEO Chris LeMay.  “As we continue our growth, we will look for opportunities to partner with high-quality companies and people like the AQS team – making us stronger and better positioned to meet our customers’ air-related requests.”

Alliance Technical Group, LLC (“Alliance”) completed its 10th add-on acquisition with the purchase of the air testing and monitoring division of O’Brien & Gere, a division of Ramboll (“Ramboll Air Testing and Monitoring”).  Ramboll Air Testing and Monitoring provides source emission testing (stack testing) and ambient air monitoring services to customers throughout the Northeastern and Midwestern United States. Acquiring Ramboll Air Testing and Monitoring is an important next step for Alliance, which is actively investing in growth to build a national, best-in-class air emission testing, monitoring, and laboratory analysis platform.  Strategically, Ramboll Air Testing and Monitoring significantly strengthens Alliance’s presence in the New York and Pennsylvania markets to promptly respond to complex, challenging source testing projects.  In addition, the partnership increases the breadth of ambient air monitoring services that Alliance can provide to its customers. Dave Ostaszewski, Division Manager of Ramboll Air Testing and Monitoring said, “Joining the Alliance team expands our resources and technical capabilities to our existing customer base and provides the ability to offer our ambient monitoring and complex source testing resources to the rapidly expanding Alliance customer base.  The Alliance approach to quality, delivery, and cross-selling customers is unmatched in the industry and will bring growth opportunities to our entire team.” Together, Alliance and Ramboll Air Testing and Monitoring have a national footprint with coast-to-coast offices and more than 700 employees, providing a deep bench of technical expertise across a diverse range of end markets. “The Ramboll Air Testing and Monitoring team brings additional talent and expertise to our complex source testing and ambient air monitoring teams,” noted Alliance CRO Scott Williams.  “The opportunity to leverage Ramboll’s experienced field technicians with our existing customer base will expand our resource pool and increase our footprint in a strategic service growth area.” About Alliance Technical Group Headquartered in Decatur, AL, Alliance is the leading provider of air emissions testing and monitoring solutions to customers throughout the United States.  With expertise in a variety of end markets, Alliance is focused on People, Process, and Technology to provide unparalleled response and service to assist customers with meeting their air compliance and risk reduction goals. For more information, please visit www.alliancetechnicalgroup.com , www.stacktest.com , www.alliance-em.com , or email info@alliancetechnicalgroup.com .

April2, 2021 –Alliance Technical Group (“Alliance”) has completed its 9thadd-on acquisition with the purchase of EMSI, one of the nation’s largest Leak Detection and Repair (LDAR) providers.EMSI will join the rapidly expanding Alliance division known as Alliance Emissions Monitoring (“AEM”).The addition of EMSI isan important growth investment for Alliance,which continues to actively build its premier emissions monitoring platform to complement its best-in-class source testing and analytical services, groups.  Strategically, EMSI bolsters Alliance’s national presenceand provides increased capabilities to effectively and efficiently respond to corporate-wide, complex emissions monitoring projects. The partnership also increases the range of monitoring and inspection services that Alliance is able to provide its customers.Paul Phillips, President of EMSI,said, “Becoming part of Alliance allows EMSI access to resources, technology, and personnel that will enhance our employee and customer growth opportunities.  Our combined team will have the largest resource base in the country and a uniquely singular focus on providing customers with unparalleled compliance, service, and support.”The combination creates a strong nationwide footprint with coast-to-coast operations, more than700employees, and a broad base of technical expertise to serve a diverse range of end markets. “This investment is a great complement to our industry-leading service offering and strengthensthe breadth of services Alliance offers to our rapidly expanding customer base.Adding EMSI to our AEM group is a perfect fit, and as we continue looking for opportunities to enter complementary markets, our primary focus is finding companies who fit nicely with our commitment to excellence, technology, and customer service – all key elements of “The Alliance Advantage,” noted Alliance CEO Chris LeMay.

We are incredibly proud to share that Alliance Technical Group won the prestigious Best in Class award at the 37th Annual Safety Excellence Awards (SEA) held on May 17, 2024, and hosted by the Industry Business Roundtable (IBR) . Alliance’s win — our first in the Technical Support Large category — is a testament to our dedication to safety and commitment to industry-leading practices. The IBR SEA is a platform for contractors and subcontractors in the Texas Gulf Coast area to showcase their on-the-job safety performance and share best practices. This award marks a significant milestone for Alliance, as we have participated in IBR’s safety awards programs for nine years, previously earning bronze and multiple gold awards. This year, we not only secured our first Best in Class but also moved into the "large" category and set a record with nominations from 12 of our clients. Daniel Boreman, Alliance’s Director of Safety, expressed, " I want to thank all Alliance employees and especially our clients for your continued focus on safety. This achievement is only possible thanks to strong leadership combined with front-line employee and client commitment. " Furthering our commitment and contributions to achieving industry-wide safety excellence and innovation, Alliance will serve as a mentor for the 2025 IBR SEA cycle, and our safety team is also sharing best practices at an IBR Health and Safety Area Council (HASC) meeting on June 20th.

DECATUR, AL – June 25, 2024 – Alliance Technical Group , a leader in on-site testing and monitoring, laboratory testing and analysis, and environmental compliance, proudly announces the acquisition of CEM Specialties Inc. (CEMSI) , the premier Canadian provider of continuous emission monitoring systems (CEMS) and process analytics solutions. This strategic acquisition enhances Alliance’s existing CEMS integration and field services capabilities and expands its footprint in North America, allowing the company to offer a more comprehensive suite of environmental services and solutions. The integration of CEMSI's advanced emissions monitoring and process analytics technologies also strengthens Alliance’s market position across multiple industries. This move enables the company to better serve clients in the power generation, cement, mining, chemical, petrochemical, and pulp and paper sectors, offering enhanced service delivery and operational efficiency. “This acquisition marks a significant milestone for Alliance Technical Group. By combining our strengths with CEMSI, we can provide even greater value to our clients across North America,” said Chris LeMay, Chief Executive Officer of Alliance Technical Group. “Expanding our field technical experts will enhance our maintenance and emergency repairs service offerings, and adding experienced engineers will increase our design and production capabilities.” About Alliance Technical Group:  Alliance Technical Group (Alliance) , headquartered in Decatur, AL, is a premier environmental services and solutions company dedicated to helping our clients achieve their environmental goals and mitigate the risks associated with regulatory changes. With more than 1,600 employees located in 45-plus offices in the U.S. and Canada, Alliance specializes in On-Site Testing & Monitoring, Laboratory Testing & Analysis, and Environmental Compliance. Powered by innovation, focused on service, and committed to our clients’ success, Alliance delivers on the promise of reliability, results, and responsiveness. See how we offer our clients a better way to maximize their environmental opportunities at www.alliancetg.com.

Receiving this industry recognition is a true reflection of the innovation, commitment and dedication demonstrated by every individual of the Alliance family. Celebrating Alliance’s massive growth is a thrill, not just as an industry leader—because every year, 2023 MERGERS & ACQUISITIONS Award Alliance Technical Group completed thestrategic mergers and acquisitions of eight organizations in 2023. With 5 of them being labs, we significantly expanded our environmental laboratory and analytics services to new regions in the US and CA. Diverse expertise and more capabilities are establishing our growing network of top-tier services.  2023 TECHNOLOGY MERIT: Mobile Air Monitoring Initiatives Alliance Technical Groupreceived this 2023 award for the Geospatial Measurement of Air Pollutants (GMAP) unit, a mobile air-monitoring unit developed in collaboration with Ken Garing and Associates, LLC. Based on the U.S. EPA’s Office of Research and Development (ORD) GMAP program. Alliance’s GMAP unit offers real-time monitoring, comprehensive coverage of air pollutants, and advanced data analysis using geospatial mapping software.On behalf of the Alliance Technical Group leadership team, Chris LeMay, Chief Executive Officer; Premal Vora, Chief Strategy Officer; and Scott Williams, Executive Advisor, proudly attended the 2024 EBI and EBJ Business Achievement Awards Ceremony for recognition of outstanding accomplishments in the environmental and climate change industries—for the year 2023.

Decatur, AL – January 17, 2024 – Alliance Technical Group ("Alliance"), a leader in environmental testing and compliance services, is excited to announce the appointment of Kim Van Soelen as the new Chief Commercial Officer. This key addition to the executive leadership team underscores Alliance Technical Group's commitment to accelerating growth and market diversification. With an impressive career over three decades, Kim is a seasoned professional in strategic growth, revenue enhancement, business development and marketing. Her expertise in these areas has been honed through significant leadership roles, most notably as Senior Vice President, Strategy & Growth at AECOM where she played a key role in diversifying market share and driving EBITDA growth within the firm’s vertical infrastructure business. "Kim’s appointment as Chief Commercial Officer is a strategic move for Alliance. Her extensive experience and proven track record in leading teams to achieve remarkable growth make her an invaluable asset to our company," stated Chris LeMay, CEO of Alliance Technical Group. "As we continue to expand our market footprint, Kim's visionary leadership and customer-centric approach will be instrumental in guiding our commercial endeavors." In her new role at Alliance Technical Group, Kim will focus on developing and implementing comprehensive commercial strategies, fostering key partnerships, and driving business growth. Her approach will enhance Alliance’s market position and help elevate the customer experience within the company’s diverse customer base.

For those stationary combustion turbines (SCT) where the stay was removed on March 9, 2022 (New Lean Premix and Diffusion Flame Gas-Fired Turbines), the initial performance test is required to be completed by September 5 , 2022 (180 days after the compliance date).  Due to the restricted compliance testing window and the industry-wide resource limitations for these highly complex projects, some facilities will not be able to meet the deadline for the initial performance test. Therefore, Alliance recommends consulting with your Administrator (state or local permitting authority who has delegation) to request an extension of the initial performance test leveraging either 40 CFR 63.6(i), extension of compliance with emissions standards, or 40 CFR 63.7(a)(4), performance testing extensions claiming force majeure. Additionally, Alliance recommends getting your MACT YYYY test scheduled as quickly as possible beyond the current deadline of September 5, 2022 and include this information in your extension request. Schedules after September 5 are rapidly filling and will continue to do so due to the limited industry resources. Finally, if you need support in requesting an extension, please contact Jonathan Brockhaus at the following email Jonathan.brockhaus@alliancetechnicalgroup.com

In today’s world, operating in compliance with established requirements is critical to the success of an enterprise. The cost of failure can be very high – potentially involving curtailment of operations, loss of business, hefty fines and penalties, as well as damage to the reputation of the company. Selecting the highest quality provider of testing services is the best way to mitigate this risk. The technical expertise, equipment, and methodology needed to properly measure the tightening limits for air compliance requires a deep bench of scientists, recurring capital investment, and highly skilled, trained and experienced personnel who know their jobs inside and out and know how to work safely on a customer’s site. Establishing and maintaining this capability comes with a cost, particularly in today’s inflationary environment. Often, the risk of non-compliance increases when the lowest cost provider is chosen to provide technical services.  Procurement teams using “e-auctions” or other tools that focus solely on proposal cost to select suppliers can, unintentionally, create higher risk, and, in the long term, significantly higher costs for the company.  “Lowest cost” often means undertrained, undermanned and inexperienced teams, lack of redundant equipment or even the wrong equipment being used due to a lack of industry or process-specific expertise. A quality test team measuring several target analytes from several sources often consists of multiple sample trains, two or more mobile labs, and highly qualified and experienced project managers, project scientists and technicians.  Each method being performed requires specific equipment, documented SOPs and knowledgeable technical team members who not only cross every “t” and dot every “i”, but also have the depth of real experience and judgment needed to provide the most useful feedback to the customer when processes or control equipment aren’t performing as expected. As industry continues to work towards meeting the ever-tightening limits being set by regulatory agencies, the ability to measure and report actual emissions accurately (and consistently) becomes more challenging, and therefore, requires even more emphasis on choosing your testing partner carefully. The best way to accomplish this is by selecting the highest quality provider - who may not appear be the cheapest - but is actually the one who will provide the most economical result thanks to their investments in the technology, training, equipment, and personnel needed to deliver highly accurate reports, timely proposals, and comprehensive test plans. The Alliance Advantage was created to ensure this result.  Find out more at www.stacktest.com .

Emission monitoring is a critical function for industries aiming to minimize their environmental footprint while adhering to regulatory standards. The task, however, is laden with challenges — from ensuring accurate data collection to maintaining compliance with ever-evolving environmental laws. The advent of specialized: software and modern technology has emerged as a beacon of resolution to these challenges. By harmonizing the capabilities of both, industries can now navigate the intricacies of emission monitoring with improved accuracy, efficiency, and compliance. Let's unravel the essential roles of software and technology in enhancing emission monitoring systems, revealing how they can collectively contribute to better environmental management. Accuracy and Real-Time Analysis Accurate emission data is a top priority. Incorporating software solutions can help enhance the precision of data capture and analysis. For instance, real-time monitoring systems are capable of instant data processing, enabling immediate insights into emission levels. This immediacy not only fulfills regulatory mandates but also empowers industries to take prompt corrective actions. Real-time data processing for immediate insights. Reduced manual errors through automated data collection and analysis. Automation and Efficiency Automation stands as a cornerstone in elevating the efficiency of emission monitoring systems. By automating data collection and analysis, industries can reallocate resources to other critical areas. For example, an automated system can schedule regular equipment checks, ensuring optimal functionality and accurate data capture without human intervention. Streamlined operations through automated data collection and analysis. Regular, automated equipment checks for maintained accuracy. Compliance and Reporting Navigating through the maze of environmental compliance is less daunting with the aid of specialized software. These software solutions ease the generation of comprehensive compliance reports, a task that traditionally demanded substantial manual effort. Moreover, electronic reporting has become a standard in many regions, further underscoring the importance of software in emission monitoring. Simplified compliance reporting for adherence to environmental regulations. Effortless generation and sharing of comprehensive reports with regulatory bodies. Data Management and Decision Making Effective data management is fundamental for a robust emission monitoring strategy. Software platforms offer organized storage, easy retrieval, and insightful analysis of historical emission data. This reservoir of data becomes a powerful tool in strategizing for lower emissions, demonstrating a clear trajectory of improvement to stakeholders, and making informed decisions. Organized storage and easy retrieval of historical data. Informed decision-making derived from insightful data analysis. The integration of software and technology in emission monitoring is a significant stride toward sustainable industrial operations. It encapsulates a forward-thinking approach, where automated, accurate, and efficient emission monitoring lays the foundation for environmental stewardship. As this area continues to advance, it requires closer examination and engagement from industry leaders who want to harness its full potential for a cleaner and more compliant industrial landscape.

Decatur, AL – July 9, 2024  – Alliance Technical Group , a leader in on-site testing and monitoring, laboratory testing and analysis, and environmental compliance, is pleased to announce several strategic appointments to bolster client services, accelerate ongoing growth initiatives, and continue the company’s commitment to delivering exceptional value to its clients.   “These new hires mark a significant milestone in our company’s growth, allowing us to not only support every business unit but also expand our service offerings and market presence,” said Chris LeMay, Alliance CEO. “Together, they bring a wealth of expertise to Alliance and enable us to provide best-in-class capabilities to our existing and future clients. We’re excited to welcome each of these professionals to our team.”   These individuals, contributing to the company’s Strategy, Commercial, and Environmental Consulting units, exemplify Alliance’s dedication to expanding its capabilities and positioning its clients to reach their environmental goals by minimizing risk and maximizing results. Strategy Erick Mirabella, Senior Vice President of Strategic Growth  An accomplished operations and business development professional, Erick brings more than two decades of experience in driving strategic growth, including serving as VP of Operations for SGS North America and SVP of Operations at Montrose. With experience across all of Alliance’s key offerings, from stack testing to emissions monitoring to labs, he has proven expertise in growing emerging service offerings into top achievers and spearheading major acquisitions. At Alliance, Erick is responsible for leading the company’s efforts to grow ascending areas of the business, such as OGI, emerging technologies, and ambient air monitoring. Hafsa Munshi, Director of Strategic Initiatives  Hafsa recently joined Alliance as the leader of its post-merger integration program, where she works with the company’s integration teams to identify and resolve integration challenges and support newly onboarded colleagues joining from acquisitions. To guide her in this role, Hafsa leans on her experience working for several well-known management consulting firms, including Alvarez and Marsal and McKinsey & Company, where she spent 10+ years leading successful integrations of public and private equity-backed companies. In addition to integrations, Hafsa contributes to the execution of value creation and other strategic initiatives. Ivan Roslak, Director of Operational Excellence  Ivan recently returned to Alliance to lead operational process improvements in the company’s on-site testing and monitoring businesses. Drawing from a robust background in manufacturing and operations, Ivan excels in leading large teams and driving process improvements. He began his career with Alliance as an engineering co-op student in 2009. Having served in engineering and operations leadership roles in the secondary aluminum, automotive, and biotech industries, Ivan specializes in optimizing internal business processes and building reliable, efficient operational practices, aligning with Alliance’s near- and long-term growth strategies.  Commercial Vickie McCormick, Vice President of Marketing  Joining Alliance as a seasoned marketing leader with a demonstrated track record in communications and brand development, Vickie thrives at developing winning strategies for marketing campaigns. She is dedicated to fostering collaboration among content teams and driving successful go-to-market approaches and messaging for global companies. Vickie’s career includes 21+ years with infrastructure firm AECOM, where she most recently served as an AVP for Strategic Communications. Carly Johnson, Strategic Account Manager, Environmental Labs & Analytical Services  An accomplished strategic account executive with 10 years of business development experience in the environmental laboratory testing industry, Carly flourishes in sales leadership roles, leaning on her in-depth understanding of the sales process and its impact on client experiences. Carly excels at fostering and maintaining meaningful client relationships, enhancing and improving processes, and analyzing and interpreting data. In her role as Alliance’s strategic account manager for labs, Carly is instrumental in driving new business growth and fostering strong relationships with key engineering consultants.  Environmental Consulting Kristine Davies, Project Director, Air Quality Kristine is a seasoned project director with nearly 20 years of expertise in environmental consulting, complemented by a decade of experience in manufacturing and environmental engineering. She excels in air quality permitting and compliance, specializing in Title V, PSD, NNSR, and minor source permitting. Kristine’s proficiencies include NSPS, NESHAPs, RACT regulations, emissions quantification, and emissions inventory submittals, making her a versatile leader in the field and an invaluable asset to Alliance’s environmental consulting services team. Tim Sperfslage, Project Director, Air Quality Tim brings 15 years of expertise in the environmental field. Specializing in air pollution control equipment design and environmental consulting, he is skilled at collaborating with clients across the renewable fuels, petroleum refining, oil and gas, and manufacturing industries. Tim’s role at Alliance is to ensure successful air quality projects for the company’s clients, which includes providing air quality permitting, regulatory applicability, modeling, monitoring, and reporting services at both the state and federal level for new and existing facilities. About Alliance Technical Group:     Alliance Technical Group (Alliance) , headquartered in Decatur, AL, is a premier environmental services and solutions company dedicated to helping our clients achieve their environmental goals and mitigate the risks associated with regulatory changes. With more than 1,600 employees located in 45-plus offices in the U.S. and Canada, Alliance specializes in On-Site Testing & Monitoring, Laboratory Testing & Analysis, and Environmental Compliance. Powered by innovation, focused on service, and committed to our clients’ success, Alliance delivers on the promise of reliability, results, and responsiveness. See how we offer our clients a better way to maximize their environmental opportunities at www.alliancetg.com .

Replacing CEMS analyzers at a Part 75 facility involves more than swapping hardware. It triggers a recertification sequence, requires monitoring plan and QA/QC plan updates, and demands careful scheduling to avoid unnecessary data substitution. This guide covers when replacement is warranted, how recertification works, and what to plan for along the way. When Analyzer Replacement Is Warranted Common drivers include: Obsolescence — manufacturer has discontinued the model or no longer provides technical support Poor performance history — repeated failures, out-of-control periods, or chronic drift Parts unavailability — critical components can no longer be sourced in a reasonable timeframe Technology upgrades — newer analyzers offer better accuracy, lower detection limits, or improved DAS integration Regardless of the reason, replacement should be treated as a project: define scope, budget, and schedule before procurement. Recertification testing, engineering work, and documentation all need to be accounted for upfront. Compliance Testing Procedures for Replacing Analyzers Replacing an analyzer triggers a full recertification sequence under Part 75. The required tests, in order: 1. Probationary CAL (Conditional Data Validation) The first passing online calibration after installation establishes a conditional data validation, marking the start of the recertification clock. Pass/fail criteria apply to SO2, NOx, CO2, O2, and flow depending on your monitoring configuration. Alternative performance specifications may be available under certain conditions. 2. Seven-Day Calibration Drift Test Conducted within 21 consecutive unit operating days of the first CAL. Requires seven consecutive passing calibrations using the same pass/fail criteria as the probationary CAL. Evaluates analyzer stability across normal operating cycles. 3. Cycle Time Test (Step Response) Measures the time for the analyzer to reach 95% of the final reading when transitioning between stack gas and calibration gas. Performed by injecting zero and high-span bottled gases; the step change must be achieved within 15 minutes. Under Part 75, this is a single test — it does not need to be repeated. 4. Linearity Check Conducted after 168 consecutive unit operating hours following the first CAL. Verifies analyzer accuracy across low, mid, and high reference gas concentrations. Pass/fail criteria are based on the absolute difference between reference gas values and actual analyzer readings. 5. RATA (Relative Accuracy Test Audit) Compares CEMS measurements against reference method data collected simultaneously by an independent testing firm. Requires a minimum of nine test runs at each tested load level. Bias testing is performed concurrently. Passing at a stronger relative accuracy level may qualify the facility for annual rather than semi-annual RATA frequency. 6. Certification Test Records Records must be created for each compliance test and submitted quarterly. Required documentation includes start and end dates, conditional data validation details, QA event and test codes, and DAS-generated QA files. Reference Gases and Installation Considerations Reference gases must be NIST-traceable and confirmed available before testing begins. Blended multi-component cylinders reduce the number of cylinders required and simplify technician logistics. Where possible, standardize reference gas concentrations across your analyzer fleet. Installation planning should address engineering and regulatory requirements in parallel. Changes to probe location should be reviewed against your monitoring plan before work begins, as modifications may trigger additional compliance requirements under Part 75 Appendix A. Monitoring Plan and QA/QC Plan Updates Replacing an analyzer requires monitoring plan updates — component IDs, analyzer make and model, span values, and applicable performance specifications all need to reflect the new equipment. These updates must be submitted to EPA prior to or concurrent with recertification testing. Your QA/QC plan should also be reviewed to ensure procedures reflect the new analyzer's operating requirements. An outdated QA/QC plan is a common audit finding that can be avoided with a review before the new unit goes online. Alliance Technical Group can review your monitoring and QA/QC plans before installation to identify gaps and ensure documentation is in order before testing begins. Analyzer Selection Considerations Analyzers from different manufacturers using the same measurement principle perform comparably for Part 75 purposes — the compliance tests don't favor one brand over another. Practical selection criteria: Fleet standardization — running the same model across monitoring locations simplifies spare parts inventory and technician training DAS integration — confirm the new analyzer communicates cleanly with your DAS before finalizing procurement Service support — evaluate parts availability and manufacturer technical support, not just upfront cost Alliance Technical Group works with multiple analyzer manufacturers and can provide guidance on selection based on your specific regulatory requirements, site conditions, and existing equipment. Get Support for Your Analyzer Replacement Project Analyzer replacement under Part 75 involves regulatory documentation, compliance testing, monitoring plan updates, and scheduling — all at once. Alliance Technical Group provides end-to-end support: pre-installation regulatory review, recertification testing coordination, and monitoring plan and QA/QC plan updates.

A 40 CFR Part 75 Overview The Part 75 rule found in Volume 40 of the Code of Federal Regulations (CFR) was created by the U.S. Environmental Protection Agency (EPA) to establish requirements for monitoring and recordkeeping of air pollutants emitted from electric generating units (EGUs) in support of EPA's Acid Rain Program (ARP). The Part 75 regulations consist of eight subparts based on the regulation's purpose and applicability, requirements relevant to each pollutant, missing data procedures, certification and recertification requirements, and recordkeeping and reporting policies. Part 75 also includes ten appendices that highlight CEMS requirements and data calculation guidelines based on pollutant and fuel type. An in-depth overview of 40 CFR Part 75 can be found in the EPA's Plain English Guide to the Part 75 Rule. What Does 40 CFR Part 75 Do? Part 75 was originally published in 1993 to provide support for the ARP, which was instituted in 1990 under Congress' Title IV of the Clean Air Act. The program regulates EGUs that burn fossil fuels—such as coal, oil, or natural gas—and serve a generator greater than 25 megawatts. Part 75 requires these units to provide continuous emissions monitoring (CEM) and reporting of three pollutants: Sulfur dioxide (SO₂) Carbon dioxide (CO₂) Nitrous oxides (NOₓ) The Acid Rain Program and Part 75 One of the main purposes of Part 75 is to support the ARP in requiring emission reductions of SO₂ and NOₓ, the main precursors of acid rain. Acid rain is created when SO₂ and NO₂ react with water, oxygen, and other chemicals to form sulfuric and nitric acids. These acids combine with water and deposit in the form of acid rain, which is harmful to ecosystems and the environment. Part 75 is referenced in several other core Acid Rain rules and also interfaces with parts of the New Source Performance Standards (NSPS) in 40 CFR Part 60. There are currently three active programs that require Part 75 monitoring: Acid Rain Program (Federal) Clean Air Interstate Rule (CAIR) (Federal) Regional Greenhouse Gas Initiative (State) The regulations within Part 75 also include requirements for continuous emissions monitoring or opacity monitoring systems to ensure they are working properly. Specifications for these requirements are included in the appendices. What are the 40 CFR Part 75 Subparts and Appendices? The subparts of Part 75 are based on the regulation's purpose and applicability, requirements relevant to each pollutant, missing data procedures, certification and recertification requirements, and recordkeeping and reporting policies. The EPA added Subpart H to Part 75 in 1998. This subpart was adopted due to growing concerns over hazards associated with NOₓ emissions, as NOₓ is a precursor to ozone and fine particulate matter formation. The appendices of Part 75 break down specific requirements for CEMS and guidelines for calculating and estimating emissions data. Appendix D and E specify the methodology and protocol of emissions monitoring depending on the fuel type fired by an EGU (coal, gas, or oil). Why is Continuous Monitoring Necessary? SO₂, NOₓ, and CO₂ are monitored under a cap and trade program in which EPA—or a state regulatory agency in the case of CO₂—limits the total annual/seasonal mass emissions of the pollutant and divides it into emission allowances that are allocated to sources over a period of time. Sources may buy and sell allowances from each other. To measure the total mass of emissions over time, the emissions must be monitored continuously. Part 75 provides a necessary measurement method by: Ensuring that emissions from all sources are consistently and accurately measured and reported Requiring a complete record of emission data to be produced for each unit in the program (i.e., data are obtained for every hour of unit operation) Verifying that emission caps are not exceeded, thereby ensuring that emissions are not underestimated and that emission reduction goals are being met How Alliance Technical Group Supports Part 75 Facilities Alliance partners with power clients to deliver dependable emissions testing, continuous monitoring expertise, and strategic compliance guidance that strengthens reliability, simplifies reporting, and helps facilities meet the highest regulatory standards. Whether you need stack testing to satisfy initial certification requirements, CEMS installation and maintenance to keep continuous monitoring systems performing at spec, compliance software that automates data acquisition and reporting, or expert guidance on missing data procedures and recertification—Alliance has the in-house capability to handle it all. Our teams work across every phase of Part 75 compliance so power facilities can focus on operations while we manage the complexity behind the numbers.

A Factory Acceptance Test (FAT) confirms that your CEMS or DAS equipment and software work correctly before it ever leaves the shop. FATs aren't required by regulation, but skipping one is one of the easiest ways to turn a straightforward installation into a costly field repair. What Is a Factory Acceptance Test (FAT)? A FAT is a structured test of a system's hardware and software, run in a controlled environment before the equipment ships to your site. The goal is simple: catch problems on the shop floor, where they're cheap and fast to fix, instead of in the field, where they're neither. No regulation mandates a FAT. But for CEMS and DAS projects, that testing window is often the last chance to verify configuration, logic, and calculations before installation crews start pulling cable and analyzers go into racks. Skip it, and issues that would have taken an hour to correct in the shop can turn into days of field troubleshooting, change orders, and schedule slips. Why a FAT Is Worth the Time The cost math is straightforward. A configuration error found during a FAT gets fixed by an integrator sitting at a bench with the full system in front of them. The same error found after installation means a technician on-site, a system that may need to come back down, and a customer waiting on a system that isn't fully operational yet. A FAT also gives you a real look at the system before you're depending on it for compliance reporting. You see the dashboards, run through alarms, and confirm the reports before go-live, not after. Types of CEMS and DAS Factory Acceptance Tests The scope of a FAT depends on what's being delivered. Two types come up most often on CEMS and DAS projects: a DAS FAT and a Hardware/Full FAT. DAS FAT (Software and Data Acquisition System) A DAS FAT covers the DAS software (the server) and DAS hardware (the data controller or PLC) — nothing else. It's the right scope when the DAS is being installed against existing or third-party analyzers and sample systems. Typical items covered: • I/O details (analog ranges, digital trigger states, base digital logic) • Calculations (unit conversions, base calculations) • Complex digital logic • Validation methodology • Calibration logic • Alarm methodology • Compliance calculations • Reports • Dashboards Hardware / Full FAT A Hardware or Full FAT covers the complete package: analyzers, DCS connection points, sample systems, CEMS rack equipment, and the DAS and data controller/PLC that tie it all together. This is the right scope for projects where ATG is supplying the full CEMS system alongside the DAS. Typical items covered: • Analyzer readings checked against known reference values • Analyzer faults triggering the correct alarms at the analyzer • Analyzer-to-PLC/data-controller readings matching (no scaling or unit-of-measure mismatches), with alarms matching as well • Sample system valving following the correct logic, sample pump de-energizing on specified faults, and calibrations passing What to Expect During a FAT FATs typically run at the integrator's facility, with the customer's project team, engineers, and often the site operators who'll run the system day to day invited to attend. Plan for a few things going in: A written test plan. You should see the FAT checklist ahead of time, not during the test. It gives you a chance to flag anything specific to your site or permit conditions before the clock starts. Time for questions, not just checkmarks. A good FAT is also a working session. Use it to ask about alarm thresholds, report formats, or anything about the system you're not sure you understand yet. Documented results. Every item tested should be logged, along with any deficiencies found and how they were resolved. That record becomes part of your project file and your reference point if a question comes up after startup. A punch list, if needed. It's normal for a FAT to surface a few items that need correction. What matters is that they're tracked to closure before the system ships, not carried into the field. How Alliance Approaches Every FAT Alliance Technical Group treats the FAT as a checkpoint, not a formality, on every CEMS and DAS project. We show up prepared. Before the client arrives, our integrators run their own internal FAT to verify the system and correct anything they find, so the time you spend with us is spent on your questions, not on catching our mistakes. We test for satisfaction, not just specs. Meeting the functional spec is the baseline. We also use the FAT to walk you through the system so you leave confident in how it operates, not just confident that it passed. We document everything. Our FAT checklist covers every component of the system, and we track results against it so there's a clear record of what was tested and confirmed. A FAT is one of the best opportunities you'll get to review the system with your engineer before it's running your compliance data. Don't skip it. Alliance Technical Group provides CEMS shelters, data acquisition systems, and the full range of stack testing, LDAR, and ambient air services that keep facilities compliant. FAQ Is a Factory Acceptance Test required for a CEMS or DAS project? No. A FAT isn't required by regulation. It's a best practice that catches configuration and equipment issues before installation, when they're far less expensive to fix. What's the difference between a DAS FAT and a Full FAT? A DAS FAT tests only the DAS software and data controller/PLC. A Full FAT (also called a Hardware FAT) tests the entire CEMS package, including analyzers, sample systems, and DCS connection points, in addition to the DAS. Who should attend a factory acceptance test? Your project engineer, and ideally the operators who'll run the system day to day. Attending the FAT gives your team a working knowledge of the system before it's installed, not after. What happens if an issue is found during a FAT? It gets added to a punch list and corrected before the system ships. That's the whole point of testing at the shop instead of the field: problems get fixed while they're still cheap and easy to fix.