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We have extensive experience in all the aspects necessary to address the issues of source (stack) emissions testing, emissions monitoring equipment, emissions inventory development, control equipment evaluation, EPA Compliance and the like.

GCI is prepared to assist in complying with regulations resulting from the Clean Air Act.  Our service package for emissions sampling services provides the information essential in devising plans, certifying monitor systems, and determining compliance status and operational efficiency.

Testing Services

Compliance Emissions TestingDiagnostic Emissions TestingSCR TestingSNCR TestingAir HeatersScrubbersPrecipitatorsBaghousesContinuous Emissions Monitoring Systems (CEMS)Relative Accuracy Test Audits (RATA’s)Bias TestingCombustion Turbine TuningCEMS Maintenance and QA/QCReference Method Emissions TestingAir Toxins Emissions TestingBoiler Efficiency TestingAcid Dew PointMist Eliminator EfficiencyFly Ash Resistivity

GCI’s quality derives from continuously re-visiting the processes and procedures used in our stack testing project experiences so we can continue to provide excellent emissions sampling services.  Our association with private industry, utilities, A&E firms, and government sectors provide the management credentials for this process. GCI’s involvement with both regulations and regulatory agencies may provide a cost-effective alternative in interaction with local, state, and federal environmental agencies.  Our goal is to provide our clients the input necessary to address emissions sampling services in a manner that is economical to the practical extent and consistent with responsible care practices. Specific test method capabilities include, but are not limited to:


  • USEPA: 1-4, 5, 5A-H, 6, 6A-C, 7, 7A-E, 8, 9, 10, 11, 12, 13A-B, 17, 18, 19, 20, 23, 24, 24A, 25, 25A-B, 26, 26A, 29, 30B, 101, 101A, 104, 201A, 202, 316, 318, 320, 323 
  • CTM
  • CARB
  • VOST
  • ASTM Methods including Ontario Hydro for HG, 2F, 2G, 2H for stack and rectangular ducts and Cascade Impactor.

 (GCI is not limited to the above Methods but are a representation of those commonly requested or performed.)


  • O2, CO2, SO2, NOx, CO
  • VOC
  • FTIR
  • Particle Size Distribution, Ash Resistivity,Controlled Condensate SO3, Pressure Drop, Electronic Flow.


  • Particulate
  • SO2
  • SO3
  • PM10
  • Mercury
  • HCL

Mercury Testing Services

Read more about our Mercury testing services, including RATAs, speciated testing and onsite capabilities!

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Precision Flow©

Precision Flow is a multi-probe electronic flow measurement system designed for speed, accuracy and affordability and has been the method of choice for the nations largest utilities.

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Mobile Labs

GCI currently operates a fleet of thirteen (13) complete source emissions sampling mobile monitor laboratory trailers equipped with the required apparatus to perform emissions sampling on a continuous basis. These trailers can also be equipped with analytical equipment to enable us to perform a variety of analyses on site and provide immediate results. These trailers are mobilized on-site allowing us to be responsive to the most demanding sampling requirements.

Analytical Services

GCI maintains a professional laboratory in each of its three offices and qualified staff to perform in-house analytical services. The laboratory staff strives to provide highly accurate and timely results to our clients. During the process of evaluation of compliance status, it may be necessary to perform more exhaustive analytical testing. It is GCI’s policy that it can best utilize its resources by employing a small select group of outside laboratories. In this manner, we can effectively control both the quality and cost of services provided. We assure that these facilities employ state-of-the-art technology and have an experienced staff to provide competent results on time within competitive pricing guidelines.

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