Areal distribution of contaminants

Table 2. Concentrations of HMX (mg/kg) by SW-846 Method 8330 at firing range 44

Figure 7. Concentrations (mg/kg) of explosives residues as a function of depth for grid A, sampling location 1-44

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1-44 (Table 3). The maximum concentration of RDX

a few meters of the target location, an area that prob-

in these surface samples was 1.7 mg/kg, and only

ably experienced an enormous number of local

one other sample had a concentration above 1

detonations. This disturbed the soil profile sub-

mg/kg. These RDX concentrations appear to be

stantially, perhaps mixing the soil in the top 60 cm.

much lower than those obtained for the 1994

study, indicating that RDX concentrations have

Areal distribution of contaminants

declined in these surface soils with time.

The distribution of HMX in the surface soils for

The maximum concentrations of HMX residues

sampling area 1-44 is shown in Figure 8a. Mean

in surface soils were two to three orders of magni-

concentrations plus or minus standard deviations

tude lower in sampling area 1-48 than in sampling

for the 0- to 15-cm layers in grids A, B, C, and D

were 295 142, 320 246, 109 133, and 1.44

area 1-44 (Table 4). RDX concentrations were also

slightly lower, but penetrated deeper than

1.92 mg/kg, respectively (Table 2). Thus, concen-

observed in 1-44 into the soil profile in three

trations of HMX in the surface soils decline

samples. For example, RDX concentrations of 0.44

beyond 10 m from the target, but not as quickly as

and 0.40 mg/kg were found at the 45- to 60-cm

we found at CFB-Valcartier (Fig. 3, Jenkins et al.

depth interval for sampling points 1-48-1 and

1997a). Concentrations of RDX (Fig. 8b), TNT (Fig.

1-48-2. These samples, you will recall, are within

8c), 4-AmDNT, and 2-AmDNT were detected in

Table 3. Concentrations of RDX, TNT, 4-AmDNT, and 2-AmDNT

(mg/kg) by SW-846 Method 8330 in surface (015 cm) soils at firing

range 44 (location 144).

Sample

RDX

TNT

4-AmDNT

2-AmDNT

Grid A

1-44-1

0.50 (1.70)*

0.10 (0.59)

1.08 (1.46)

0.90 (1.31)

1-44-2

0.55

0.05

1.24

0.99

1-44-3

0.19

0.23

0.43

0.20

1-44-4

0.09

0.06

0.69

0.58

Mean std. dev

0.29 0.20

0.17 0.14

0.91 0.42

0.72 0.41

Grid B

1-44-5

0.26

0.06

0.47

0.36

1-44-6

0.43

ND†

0.69

0.58

1-44-7

0.37

0.53

0.49

0.41

1-44-8

0.08 (0.08)

0.03 (0.03)

0.23 (0.20)

0.20 (0.16)

Mean std. dev.

0.20 0.14

0.16 0.25

0.47 0.19

0.38 0.16

Grid C

1-44-9

0.10

0.07

1-44-10

0.15

0.19

1-44-11

ND (0.29)

0.06 (0.09)

0.30 (0.36)

0.20 (0.25)

1-44-12

1.14

0.24

0.37

0.48

Mean std. dev.

0.32 0.55

0.08 0.11

0.24 0.13

0.24 0.17

912

Grid D

1-44-13

1-44-14

0.03

1-44-15

1-44-16

Mean std. dev.

912

* Duplicate subsample.

† Not detectable.

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