Table 4. Masses of the various explosives identified in residues from 60-mm mor-
tar rounds fired at Fort Drum, New York.
a. Round 1.
Sample
M1-S6
M1-S5
M1-S4
M1-S3
M1-S2
M1-S1
Distance from crater (m)
10.713.7 7.610.7
5.57.6
4.35.5
3.14.3
1.23.0
Area sampled (m2)
1.16
3.72
2.09
2.09
1.39
1.39
Analytes detected:
RDX
Mass-aqueous (g)
0.68
22.7
1.84
0.69
0.44
0.49
Mass-soot (g)
0.02
0.08
*
<d
*
*
Mass-total (g)
0.70
22.8
1.84
0.69
0.44
0.49
Concentration (g/m2)
0.60
6.13
0.88
0.33
0.32
0.35
HMX
Mass-aqueous (g)
0.40
3.18
<d
<d
<d
<d
Mass-soot (g)
<d
<d
*
<d
*
*
Mass-total (g)
0.40
3.18
<d
<d
<d
<d
Concentration (g/m2)
0.35
0.86
<d
<d
<d
<d
NG
Mass-aqueous (g)
<d
0.04
<d
<d
<d
<d
Mass-soot (g)
<d
<d
*
<d
*
*
Mass-total (g)
<d
0.04
<d
<d
<d
<d
Concentration (g/m2)
<d
0.01
<d
<d
<d
<d
* No separate soot sample processed; the soot-containing sample was processed using salting-
out solvent extraction.
b. Round 2.
Sample
M2-S1
M2-S2
M2-S3
M2-S4
M2-S5
Distance from crater (m)
7.99.5
6.47.9
5.26.4
3.75.2
1.23.7
Area sampled (m2)
1.39
1.49
1.49
1.49
1.49
Analytes detected:
RDX
Mass-total (g)
17.0
2.53
2.63
2.87
3.14
Concentration (g/m2)
12.2
1.70
1.76
1.93
2.10
NG
Mass-total (g)
0.09
0.05
0.07
0.15
0.75
Concentration (g/m2)
0.06
0.03
0.05
0.10
0.50
Table 5. Estimates for RDX deposited from detonations of
60-mm mortar rounds at Fort Drum, New York.
Detonation
1
2
Avg. surface conc. (g/m2)
1.43
3.94
Total contaminated surface area (m2)
81
79
Total mass deposited (g)
116
311
2.58 108
2.58 108
Mass of RDX in 60-mm (g)
Total RDX recovered (%)
0.00004
0.0001
Estimate of mean soil conc. (g/kg)*
0.17
0.46
resulting from detonation
* A soil density of 1.7 g/cm3 and a 0.5-cm depth was used to compute
the estimate.
11
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