Advanced fugitive emissions testing & LDAR management. Optical gas imaging, Method 21, SkyBridge software & mobile monitoring solutions from Alliance. Services / On-Site Testing & Monitoring / Fugitive Emissions Data Acquisition Systems Built for compliance. Tailored for your team. Alliance’s Data Acquisition Systems (DAS) give facilities across the U.S. the tools to collect, validate, and report emissions data continuously — and to stay ahead of federal, state, and local regulatory requirements without the administrative burden. Reduce time spent managing data. Centralize data collection, validation, review, and reporting in a single system. Automated calculations and data handling reduce manual effort, minimize errors, and keep your records consistent and ready for audits. Built for your facility. Backed by decades of expertise. Designed from decades of air emissions compliance experience, each system is configured to your equipment, processes, and reporting workflows, not a one-size-fits-all setup. Continuous updates keep your system aligned with evolving regulatory requirements. 24/7/365 Dedicated Expert Support Get direct access to a U.S.-based team of 15+ DAS specialists, available 24/7/365 to support your system, troubleshoot issues, and help maintain reliable compliance operations. Our DAS Products StackVision™ The most widely used DAS in the U.S., trusted by more than 3,100 air emission sources. StackVision is user-configurable — not a black-box programmed solution — so your team can manage configurations, calculations, and alarms without writing a single line of code. Prism A scalable DAS solution purpose-built for facilities that need flexibility without complexity. Prism grows with your operation and integrates with the same 8864 Data Controller hardware platform. SkyBridge Suite Details Ambient Air Monitoring Teaming with Alliance’s ambient air monitoring services provides a comprehensive, reliable solution for managing and improving your facility’s air quality. Alliance offers a wide range of ambient air services including: Air Quality Monitoring | Meteorological Networks | Odor Assessment Services | Noise Consulting & Acoustic Monitoring | Vapor Intrusion Programs Dedicated LDAR Compliance and Auditing Services Our team of environmental compliance consultants provide full-service LDAR compliance support spanning audits, QA/QC program oversight and reporting to ensure regulatory adherence. REQUEST INFORMATION “Combining our services is pivotal in supporting our clients' every need. The Alliance way is a true differentiator, providing solutions-based onsite testing and monitoring with top SMEs to handle immediate environmental challenges. Alliance is positioned as your partner of choice for highest-level delivery.” Martin Gibson Executive Vice President, Emissions Monitoring “Meticulous details, first-of-their-kind tools, and quality oversight of every LDAR program sets Alliance apart—always raising the bar for resource management, availability, and dedicated internal support.” Paul Phillips Senior Vice President, Emissions Monitoring Back to All Services

SkyBridge cloud-based software for LDAR, OGI & emissions monitoring. Real-time data management, mobile access & automated reporting solutions. Services / On-Site Testing / Fugitive Emissions / SkyBridge Software SkyBridge Software Suite Transform with SaaS. SkyBridge cloud-based Software as a Service (SaaS) platform is specially developed for seamless, scalable, secure, and compliant real-time data management of LDAR, OGI, Cooling Towers, Fenceline Monitoring, and Air Permitting. Solutions SkyBridge Share accurate LDAR field data as it’s being captured and already updating your records in real-time. Safer and simpler than on-premises systems, SkyBridge ensures gated access with no firewall breaches, saves labor and IT costs, cuts errors, and is user-friendly. In addition to supporting traditional Method 21 monitoring, SkyBridge has built-in support for OGI camera surveys as well allowing for mixed-mode monitoring whether you are doing AWP or just supplemental monitoring with the camera. Cloud-Based Mobility | Real-Time Field Data | Accurate & Secure | Comprehensive Reporting | Seamless Updates SkyBridge OGI For compliance database management, SkyBridge OGI tackles midstream and upstream optical gas imaging challenges for the oil and gas industry, plus fugitive emissions programs in other industries by eliminating manual tasks, fragmented data, and weak security. Reduced Risks | Auto-generated CEDRI reports | Instant image/video uploads | Secure real-time data synchronization Get a Custom Demo Request your own simulated SkyBridge OGI demo when you contact us for more information. SkyBridge Fenceline Monitoring Experience the ease and efficiency of managing your program with SkyBridge Fenceline Monitoring software. With built-in regulatory requirements and business rules, instant data transfer and in-field documentation—make smart, fast data-driven decisions. Eliminate mundane manual tasks and wasted hours of work, and reduce risks from human errors. SkyBridge Cooling Towers Manage your cooling system with our secure, user-friendly solution. Eliminate data loss, boost efficiency, and organize inventory with a web app. For better decision-making, streamline reporting with detailed inspections, emissions reports, and inventory lists. Easily check your field data anytime, anywhere—whether you’re on a PC, laptop, tablet, or phone. All you need is a web browser. Ready to transform with SkyBridge? Your people will thank you for the user-friendly interfaces and streamlined efficiency. REQUEST INFORMATION See How SkyBridge OGI Works "Seamlessly designed for environmental teams, SkyBridge prioritizes compliance, efficiency, and data quality. Our intuitive suite of solutions enables you to confidently manage complex regulations, minimize time-consuming processes, and maintain data integrity—all in one place and in real-time." James Naron Vice President, Technology Back to All Services

RSB Environmental is the nation's leader in Phase 1 Environmental Site Assessments and Due Diligence services by volume. Phase One Environmental Site Assessments Alliance Technical Group is the nation's leader in Phase 1 Environmental Site Assessments and Due Diligence services by volume. Fast and Affordable 10 day bank approved Phase 1 (ESA) reports by a licensed engineer with project offices nationwide. Alliance Technical Group provides fast and affordable Phase I Environmental Site Assessments that adhere to industry standards like ASTM E1527-21. Quality Phase One Environmental Site Assessments completed by environmental professionals with a minimum 10-year's experience. Comprehensive Environmental Services – All Under One Roof We provide deep technical expertise and full-scope capabilities to help you solve complex environmental challenges. We provide deep technical expertise and full-scope capabilities to help you solve complex environmental challenges. 1-877-759-1924 Request a Free Quote First name* Last name* Phone* Email* Company name* Address* Type of Service* Reason For Assessment* Submit Laboratory Services NELAP-accredited testing for air, water, soil, PFAS, and waste—fast, accurate, and defensible. On-Site Testing Monitoring Reliable source testing, emissions data, regulatory reporting, and more. Environmental Compliance Site assessments, remediation strategies, compliance audits, and permitting support across industries. We are a new kind of environmental services company—powered by innovation, focused on service, and committed to your success. Our Reach With over 60 testing and laboratory locations across the United States and Canada, we are where you need us.

Decatur, AL and Wellington, OH — 4/27/26 Alliance Technical Group, a leading provider of environmental testing, monitoring, and compliance services, announced today the acquisition of Grace Consulting, Inc. (GCI), a nationally recognized air sampling and stack testing firm specializing in air emissions testing and environmental compliance services. Founded in 2000 and operating out of offices in Ohio, Indiana, North Carolina, and Texas, GCI has established itself as one of the largest privately held stack testing companies in the nation. Over the past two decades, GCI has served clients across a broad range of industries, providing comprehensive air sampling services backed by the latest sampling techniques and technical advancements. "Grace Consulting has built a remarkable reputation as a premier stack testing firm in the country, with deep technical expertise and a strong commitment to client service," said Chris LeMay, CEO of Alliance Technical Group. "Their capabilities in air emissions testing, combined with their extensive equipment inventory and highly credentialed field teams, make them an outstanding addition to the Alliance family and significantly strengthen our national footprint." With the addition of GCI, Alliance further deepens its technical capabilities in source emissions testing while broadening its geographic reach across the continental United States. GCI's experienced field teams will integrate with Alliance's expansive environmental services network, providing clients with greater resources, enhanced technical depth, and expanded coverage. "Becoming part of Alliance Technical Group marks an exciting new chapter for GCI and the team we've built since 2000," said Scott Teague, President of Grace Consulting, Inc. "We share a commitment to delivering high-quality, reliable environmental testing services, and joining Alliance gives us the platform to offer our clients even greater resources and capabilities as we continue to grow together." This acquisition reflects Alliance's ongoing strategy to strengthen its environmental testing and compliance services and extend its reach across North America. The Exit Group supported Alliance Technical Group in sourcing and executing the transaction.

Facilities preparing for Appendix K optical gas imaging (OGI) monitoring requirements often face a common challenge: managing documentation, inspection data, videos and reporting across multiple systems. This often creates challenges during audits when records must be compiled or verified. Appendix K programs require structured documentation of OGI inspections, including daily verification checks, weather conditions, and video documentation.  What Data Must Be Collected for Appendix K OGI Inspections Inspection records must capture operational parameters such as: Temperature Wind speed Sky conditions Gas type Flow rate  Camera distance  This information is stored directly within the inspection record within SkyBridge, ensuring that verification documentation remains linked to the survey data. How SkyBridge Supports Appendix K OGI Monitoring and Documentation SkyBridge Software includes integrated functionality designed to support Appendix K workflows, helping environmental teams capture and manage the required documentation directly within a single platform. SkyBridge is part of Alliance Technical Group’s suite of environmental compliance software tools designed to streamline monitoring programs and reduce manual data management. SkyBridge operates as a cloud-based compliance management system, allowing organizations to manage LDAR, OGI, and Cooling Tower and Fenceline Monitoring programs in one centralized database. Core capabilities include: LDAR scheduling and repair tracking Method 21 monitoring support Visual leak documentation Visible vapor and OGI camera integration Leak management tracking Recordkeeping and LDAR reporting GPS tracking for field technicians Because SkyBridge integrates web and mobile applications, technicians can collect inspection data in the field while syncing information directly to the system. OGI Monitoring and Appendix K Verification and Documentation SkyBridge includes specific functionality designed to support Appendix K OGI monitoring documentation requirements. Field technicians can document and upload verification data directly from the inspection location, including: Daily verification check documentation and video uploads - Creating a traceable record that verification checks were completed prior to surveys, helping facilities demonstrate that OGI cameras were operating properly and that monitoring procedures were followed.  Daily field check documentation and video uploads - Ensures required checks are consistently recorded in real time, reducing reliance on manual logs and minimizing gaps in documentation. Weather and environmental conditions documentation - Captures required conditions at the time of monitoring, supporting data validity and helping avoid challenges to inspection results. Leak Image and video file documentation - Provides visual evidence of findings, improving transparency, supporting repair prioritization, and strengthening compliance records. QA Verification video - Documents quality assurance activities, reinforcing program credibility and helping facilities demonstrate adherence to Appendix K requirements. Supporting Scalable OGI and Appendix K Compliance Programs As OGI monitoring programs continue to expand, environmental teams need tools that help simplify field documentation and maintain consistent records. By combining inspection documentation, leak management, video uploads, and reporting into one system, SkyBridge provides a structured approach to managing Appendix K monitoring programs.

Stack testing — also called performance testing or source testing — is used to measure a facility's air emissions and verify compliance with emission limits established under the Clean Air Act (CAA). A stack test tends to go one of two ways: planned and predictable, or compressed and reactive. The difference comes down to coordination. Delays in scheduling or execution can quickly lead to retesting costs, missed compliance deadlines, production disruptions, and increased regulatory risk. What starts as a timing issue can escalate into a much larger operational and financial impact. This guide breaks down what stack testing is, when it is required, and how to execute it in a way that supports compliance and operations. What Is Stack Testing? Stack testing quantifies regulated air emissions at the source and is required to demonstrate compliance under federal programs, including NSPS, MACT, and NESHAP. It is used to demonstrate both initial and ongoing compliance under major federal programs, including New Source Performance Standards (NSPS) under 40 CFR Part 60, Acid Rain Program (Part 75, CEMS), National Emission Standards for Hazardous Air Pollutants (NESHAP) under 40 CFR Part 61, and Maximum Achievable Control Technology (MACT) standards under 40 CFR Part 63. When Is Stack Testing Required? Initial Compliance New or modified sources typically face specific regulatory deadlines for completing an initial stack test: NSPS (40 CFR Part 60): Within 180 days after initial startup, or 60 days after reaching maximum production rate MACT (40 CFR Part 63): Notice of Compliance Status is typically due within 150 days for certain subparts Ongoing Permit Requirements Facilities with an Air Pollution Control Permit are commonly required to conduct periodic testing to demonstrate continuous compliance. Regulatory agencies can also require a test at their discretion, particularly when no continuous monitoring system exists or when previous results showed a narrow compliance margin. Specific Operational Triggers Stack testing is also required in these situations: CEMS evaluations – Relative Accuracy Test Audits (RATA) and linearity checks to verify Continuous Emission Monitoring Systems Rule changes – Updates to federal standards (Residual Risk and Technology Reviews, revised PM thresholds) can trigger new testing mandates Information Collection Requests (ICRs) – EPA may require testing under CAA Section 114 to support new rulemaking Engineering and Investigative Testing Not all stack testing is regulation driven. Facilities routinely test for internal purposes — process optimization, control device evaluation, and emissions profiling for future planning. Core Requirements for a Valid Stack Test To produce defensible data, stack tests must meet strict regulatory criteria: Representative Conditions: testing must reflect normal or worst-case operations  Run Structure: compliance is based on the average of three consecutive valid runs   Advance Regulatory Notification: These windows exist to give the regulatory agency the opportunity to observe. 30 days (Part 60, Part 61)  60 days (Part 63)  Data Integrity: invalid runs must be reported and may require replacement  Failure to meet these requirements can result in rejected data or required retesting. How a Stack Test Works Most compliance tests follow the same general structure: Pre-test planning and method selection Site-specific test plan development and agency notification Equipment setup and calibration Three test runs per emission point, with QA/QC checks Final report preparation and submission A straightforward test typically takes one to two days per emission point. Complex programs — multiple pollutants, restricted access points, or extended run times — take longer. What Does a Stack Test Report Include? The final report is the primary compliance document. A well-structured report should include: Executive summary – What was tested, why, and how results compare to limits Test program summary – Facility details, regulatory drivers, emission sources, control systems, and site-specific plans Summary of results – Emissions data alongside operating conditions, compared directly to permit limits Methodology – EPA reference methods used and any method-specific considerations Appendices – Field data sheets, calibration records, process data, and example calculations Stack testing is as much about scheduling coordination as it is about testing execution. Facilities that align planning, operations, and testing early gain flexibility and reduce risk. Those that delay often face limited options and higher costs. Alliance is the largest stack testing provider in the U.S. Alliance Technical Group provides stack testing services nationwide, with accredited laboratories (NELAC, LELAP, TCEQ), on-site FTIR capabilities, and integrated field and analytical teams. Whether you're planning an initial compliance test or managing an ongoing permit requirement, we help you get through it with reliable data and fewer surprises. If you are approaching a compliance deadline, the most important step is simple: Secure your test window early. Frequently Asked Questions