Air quality measurements were made within existing buildings, but no air quality data was collected in surrounding neighborhoods or onsite at contaminated locations.

Evergreen must investigate air quality arising from subsurface contamination only, not from refinery operations above ground. As documented in the remedial investigation reports (RIRs), air samples were collected from inside site buildings, and from outdoor air locations, both as background and above areas of known LNAPL plumes. Based on the data collected in the RIRs there are no known residential areas where the contaminated groundwater has migrated from the facility to beneath those areas, therefore no off-site air sampling is planned.  The future fate and transport RIR will present the results of fate and transport modeling of groundwater plumes which will show the projected extent of groundwater contaminants over time.