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Air Toxics Assessment Refinement in RAPCA'S Jurisdiction

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RAPCA has been involved in three separate, but related and roughly concurrent, projects that make up the Air Toxics Assessment Refinement.

First, RAPCA developed a master document summarizing all past ambient air toxics monitoring (VOCs, metals, dioxin) in RAPCA's jurisdiction. Concurrently with the development of this document, RAPCA updated and expanded the local point source air toxics inventory in Montgomery County to include all point sources of Urban Air Toxics with an emphasis on MACT sources in RAPCA's jurisdiction (major and area). Dry cleaners, chrome platers, halogenated cleaning solvent facilities, and gasoline distribution facilites were moved out of the area (non-point) inventory to point source inventory. This is a considerable expansion of the scope of the current point source air toxics inventory in RAPCA's jurisdiction. The end result of this process was the submittal of a comprehensive point source air toxics inventory as part of the 2002 NEI.

RAPCA also modeled urban air toxics concentrations attributable to all point sources in the expanded RAPCA air toxics inventory. This modeling effort had a much finer focus than the county-level NATA and modeled residual risk of point sources. This facilitated identification of potential hotspots, which were selected for VOC/HAP measurements for model to monitor comparisons, which was the focus of a second grant. This grant also funded the development of a public outreach video.

Further, additional VOC monitoring was performed under a third grant in order to more fully characterize community-scale VOC concentrations in the Dayton area. This was an expansion of the current monitoring data, as most monitoring data in the area focused on metals and dioxin. This project consists of a 12-month sampling program utilizing passive sorbent tubes at 10 locations.

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