Cooper Environmental Services LLC ( CES ) specializes in the measurement and interpretation of elements in source emissions and ambient air. CES provides multi-metal management capabilities which are unequalled within the environmental monitoring field. 1 ) CES prides itself in accepting client's unique technical challenges and providing them with results through our innovated technical solutions. Today 50% of our recent method development projects do employ X-ray Fluorescence for trace metals analysis. However, we continue to be active in the method develop of aerosol generation, fugitive emissions sampling and plume simulation. Our method development capabilities have been recognized by the U.S. EPA with a Small Business Innovative Research ( SBIR ) award to study performance of the Xact 640 CEMS at a coal-fired power plant. Some of our other clients who have utilized our method development qualifications are the Electric Power Research Institute, U. S. Army, U. S. Army Corp of Engineers, Eli Lilly Company, Doe Run Company, Midwest Research Institute, Idaho Department of Environmental Quality, and the American Petroleum Institute. CES has commercialized the most promising methods that we have developed to date, which has given rise to our current product list. 2 ) CES was the first and is the only commercial manufacture of XRF based multi-metals CEMS in the world. The development of this technology earned CES the U.S. EPA's Clean Air Excellence Award in 2007 as we offered our third generation of this ground breaking instrument the Xact 640. After achieving success in the emissions monitoring field CES applied its CEMS knowledge toward the ambient market. Currently, our ambient and emissions monitors are used by clients in both private industry and government agencies around the world. The following are a few of our instrument owners: Canada Ministry of Environment, U. S. Army, Missouri Department of Natural Resources, Queensland Australia Environmental Protection Agency, Electric Power Research Institute, U. S. Army Corp of Engineers, Evonik Industries AG, South Korea National Institute of Environmental Research, Eli Lilly Company and U. S. Navy 3 ) In an effort to validate the extraordinary accuracy and precision of the Xact 640, we developed and received EPA approval for a Quantitative Aerosol Generator ( QAG 820 ). The QAG 820 average relative accuracy and precision of its multi-metal aerosol emissions is better than 95%. The QAG 820 has been used for five years to perform annual relative accuracy test audit ( RATA ) of the Xact 640's. The capability to produce an accurate and stable aerosol concentration has allowed CES to expand the use of the technology to calibrating and validating any metals or particulate matter monitors.