GEI was retained by the Electric Power Research Institute (EPRI) to prepare a compendium of perimeter air quality monitoring methods for manufactured gas plant (MGP) site remediation. The compendium was designed as a tool to be used by MGP site managers to monitor air emissions associated with an MGP site remediation.
The compendium is a compilation of information obtained from multiple sources, including the United States Environmental Protection Agency (USEPA) and the National Institute for Occupational Safety and Health (NIOSH). Additional information was obtained from protocols developed by utilities as part of their MGP programs. The member utilities provided case studies that were evaluated and included in the document.
GEI evaluated air-monitoring methods for volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), particulate matter, metals, and odors. Detailed summaries of sampling methods were prepared and method advantages and disadvantages identified. The compendium included a review of real-time and time-averaged sampling methods, identification of typical real-time and time-averaged instrumentation available, and comparison of various types of sampling media. The compendium also addressed odor concerns associated with MGP site remediations and monitoring techniques applicable for the determination of odor thresholds.
GEI also included information regarding meteorological monitoring and a discussion of appropriate levels of accuracy for meteorological instrumentation. The compendium also included a detailed outline of the key elements in preparing a site-specific air-monitoring program. The discussion of the site-specific air monitoring program included guidance on determining target compounds, establishing ambient air action levels, determination of sampling station locations, and selection criteria for monitoring methods. The compendium also provides details on the development and preparation of a Quality Assurance Project Plan for ambient air monitoring projects.
GEI also evaluated several ambient air monitoring programs that had been implemented at MGP site remediations. A series of case studies for the programs was prepared and analyzed for effectiveness of quantifying ambient air quality. Comparative costs of the programs were also included. GEI also researched and summarized recent developments and emerging trends in air monitoring techniques that may be applicable in monitoring ambient air quality at MGP sites.