Figure 10. Firing point for 40-mm grenade test. Targets for other firing events
are seen in the background.
surface soil and 0.011 to 1.7 g/g in the subsurface
Concentrations of copper were elevated well above
(Table 11). The highest concentrations were near the
background in all of the samples from the berm (Table
base of the berm. HMX was also detected above the
12). The source of the copper was probably the grenade
method detection limit along the bottom half of the
ogive (Fig. 12), which is 4% copper.
berm. Low concentrations of TNT and the amino-DNTs
A composite sample from the 40-mm firing point
were also detected, probably associated with another
was formed by collecting surface soil at 2-m intervals.
firing event. A number of targets were located upstream
No explosive or propellant residues were found in the
from the berm (Fig. 9 and 10).
soil at this firing point.
10,000
40-mm Impact Berm
8,000
6,000
4,000
2,000
0
2
6
10
14
18
Time (min.)
Figure 11. Chromatogram (GC-ECD) of solvent extract of surface soil
collected 1 m up from berm base.
18
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