Fig 1.
Schematic of the interplay between vapor intrusion, the built environment, and phytoforensic processes.
Fig 2.
Groundwater tetrachloroethene (PCE) concentrations in the study area in York, Nebraska, from August 2011 to September 2016.
Each set of points in concentric rings represents multiple samples in one area.
Fig 3.
Tree-core tetrachloroethene (PCE) concentrations and corresponding tree numbers in the study area in York, Nebraska, November, 2016.
Fig 4.
Location and date of indoor-air samples in the study area in York, Nebraska.
Each set of points in concentric rings represents multiple samples in one area.
Fig 5.
Tree-core tetrachloroethene (PCE) concentrations in the study area overlain on the interpolated tree-core PCE concentration surface.
Fig 6.
Measures of correlation between groundwater, shallow (<12 m) groundwater, soil, soil-gas, sub-slab, and indoor-air PCE concentrations and interpolated tree-core, soil-gas, and sub-slab PCE concentration surfaces.
Cells are colored orange and red if correlation coefficients are 0.50–0.59, and >0.59, respectively, cells are colored blue and yellow if correlation coefficients are 0.30–0.39 and 0.40–0.49, respectively.
Fig 7.
Sub-slab tetrachloroethene (PCE) concentrations in the study area overlain on the interpolated tree-core PCE surface.
Each set of points in concentric rings represents multiple samples in one area.
Fig 8.
Indoor-air tetrachloroethene (PCE) concentrations in the study area and interpolated tree-core PCE concentration surface.
Each set of points in concentric rings represents multiple samples in one area.
Fig 9.
Indoor-air tetrachloroethene (PCE) concentrations in the study area overlain on the interpolated sub-slab PCE concentration surface.
Points in each concentric ring represent multiple sampling events at one location.
Fig 10.
Measures of correlation between groundwater, shallow (<12 m) groundwater, soil, soil-gas, sub-slab, and indoor-air PCE concentrations and tree-core concentrations in tree-core samples collected within 31 m.
Cell highlighted with color with bold font are significantly correlated. Cells are colored orange and red if correlation coefficients are 0.50–0.59, and >0.59, respectively.