30,000
RTX-5
Sample #44
25,000
20,000
15,000
10,000
5,000
0
5
7
9
11
13
15
3
17
Time (min.)
Figure 17. GC-ECD chromatogram of soil extract from surface soil sample collected at artillery firing point
spread over a relatively large surface area during firing activity, but the amount
of residue deposited from a single round fired is probably quite small and
perhaps not detectable even using the low-level GC-ECD method. One surface
sample was also collected about 400 m to the east of the firing position, across
the road from the firing point and away from the direction of fire. Analysis of
this sample indicated that 2,4DNT was present at 33.5 :g kg-1. The source of this
2,4DNT was apparently residues that were carried downwind from the firing
activity.
Artillery range impact areas
Soil samples collected within the artillery range impact area were not col-
lected randomly across the area, but were associated with specific detonation
events as determined by visual observation and discussions with EOD techni-
cians (Table 7). The first area was a crater apparently caused by the impact of a
105-mm artillery round within a week of the time sampled (Figure 18). The type
of munition was determined on the basis of the metal debris found within the
crater. Age was estimated by the visual presence of ash. Nine surface soil
samples were collected at this location. Analyses indicated that no residues of
36
Chapter 2 Characterization of Explosives Contamination at Military Firing Ranges
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