Perimeter air quality monitoring is generally performed at MGP sites during remedial activities in which sub-surface soil affected by MGP residuals is disturbed. Most MGP site investigations indicate the presence of elevated levels of compounds typically associated with MGP sites, including semi-volatile organic compounds, particularly Polycyclic Aromatic Hydrocarbons (PAHs) and Volatile Organic Compounds (VOCs). Based on the assumed prevalence of PAHs and VOCs on MGP sites, and the general toxicity of these classes of compounds, PAHs and VOCs are generally selected as the target analytes to be included in any perimeter ambient air quality monitoring program. The choice of instrumentation or methods will depend on the level of sophistication dictated by the site-specific risk assessment. This paper discusses a number of sampling and monitoring equipment that can be used for MGP site fence-line monitoring. The benefits and disadvantages of the various instrumentation options are discussed.
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