FIGURE 4-1 Sampling points and wind rose at JBB. The length of the vanes in the wind rose corresponds to the fraction of time the wind blows from the direction of the vane. This diagram does not correspond in shape or orientation to the layout found in the aerial photos (from 2004) in Google Earth. Obtaining even approximate correspondence requires a rotation and skewing of this diagram. In particular, the location and size of the burn pit, pointed out to the committee by an Air Force contractor and visible on Google Earth imagery, does not correspond (even after rotation and skewing) to the location or size shown on this diagram. The committee is therefore unclear on the exact locations of the sampling sites relative to the burn pit.
SOURCE: Taylor et al. (2008).
2007. [NOTE: There appears to have been sporadic air sampling during 2006; the committee was furnished with some results of 2006 sampling for dioxins but does not know the specific location or exact methodology used.]
The air monitoring approach included fixed site samplers that were placed at the mortar pit (selected to be upwind of the burn pit), at the H-6 housing and CASF sites, and at the guard tower and transportation field sites (chosen to be downwind of the burn pit) (Taylor et al. 2008). No measurements were taken in close proximity to the burn pit. Sampling sites near each other were combined in the 2007 data available to the committee, so that samples were identified as being collected at the mortar pit, the guard tower/transportation field, or H-6 housing/CASF. The 2009 data available to the committee were provided for the five distinct sampling sites shown on Figure 4-1. However, there are no simultaneous samples available to the committee that allow comparison between the guard tower and transportation field sites, or between the H-6 housing and the CASF site. Therefore, the committee combined the data for the guard tower and transportation field sites, and for the H-6 housing and CASF sites, treating each combination of sites as an individual sampling location.