Table 6. Explosives concentrations in soils at 105-mm Howitzer #1 position, Fort Lewis

Table 6. Explosives concentrations in soils at 105-mm Howitzer #1 position, Fort Lewis

(g kg1).1

Location2

From

Sample

muzzle Depth

no.

(m)

(cm)

TNT

2,4DNT

2,6DNT

4A2NT

2A4NT

NG

2,5DNT

3,4DNT

<13

1

1.5 R

8.15e3

360

631

250

299

6.7

30.1

9

3.0 R

336

1.75e5

4840

1600

666

<20

158

696

2

1.5 L

28.3

3.47e4

999

515

290

<20

23.7

123

t4

10

3.0 L

81.6

3.18e4

211

t

14.2

122

3

0.5 C

47.1

2.89e4

1000

745

300

t

23.9

151

4

1.0 C

142

4.37e4

420

677

302

<20

25.4

175

5

1.5 C

397

1.44e5

743

1230

451

<20

71.0

503

6

2.0 C

442

1.15e5

133

3000

1340

<20

44.7

380

7

2.5 C

215

1.4e5

1314

666

372

<20

73.5

456

8

5.0 C

158

9.1e4

1330

791

272

<20

60.2

327

11

5.0 C

3.0 R

167

1.62e5

3840

1500

762

254

134

637

12

5.0 C

<1

982

4.8

t

<20

<d

3.0 L

13

10 C

9.7

2.21e4

455

303

t

<20

20.8

108

10C

14

3R

5.5

5.15e4

39.5

t

<20

1.9

18.1

10C

15

3L

106

3.11e4

63.4

351

297

<20

10.3

107

2 C5

16

85.2

6.69e4

300

<d

<20

23.7

209

23

2C

0.5-5

<1

955

16.3

t

<20

<d

1.78

24

2C

5.1-9

<1

458

6.6

<d

<20

<d

17

2A

125

6.19e4

1160

687

257

<20

51.0

249

18

2B

188

9.92e4

1260

1070

398

<20

51.6

323

19

2C

63.5

1.96e4

340

480

385

<20

16.1

88.7

20

2D

13.6

6.27e3

7.1

300

t

<20

<d

16.5

21

2E

20.5

2.63e4

65.8

508

t

<20

9.7

82.7

22

2F

1.7

4.4e3

10.0

t

<20

<d

22.8

Bkg6

48

<1

33.5

0.9

<d

<20

<d

~400

1

Values are for surface soils except where noted. The following undetected analytes were excluded from the

table: HMX, RDX, 4-aminodinitrotoluene 2-aminodinitrotoluene, 1,3-dinitrobenzene, 1,3,5-trinitrobenzene,

3,5-dinitroanaline, 3,5-dinitrotoluene, 2,4,5-trinitrotoluene, 2,3,4-trinitrotoluene,

2

Locations are distances relative to the muzzle of the gun in meters; R = to the right, L = to the left, C =

directly in center front. Depth in cm is also given for samples not taken from the surface.

3

Less than detection limits.

4

Values are trace below mean detection limits (see Table 1).

5

Wheel pattern of sampling: C = center of wheel; AF clockwise around wheel circumference.

6

Background, soil across from Gun 1.

be at least two orders of magnitude lower than 2,4-DNT;

heterogeneity of analytes in the surface. The results (Fig.

concentrations of 2,5-DNT were generally three orders

14) indicate that concentrations of 2,4-DNT ranged from

4,400 to 99,200 g/kg. Thus as found elsewhere, the

of magnitude lower than 2,4-DNT. Molecular sulfur was

distribution of munitions-related analytes is spatially

also detected in these soils; it is a component of the

percussion primer assembly for 105-mm round.

very heterogeneous, even over short distances.

The distribution of 2,4-DNT in the soil samples col-

Only two subsurface soil samples were collected in

lected in front of Howitzer #1 is shown in Figure 14.

the area in front of Howitzer #1. These samples were

All but two of these samples were collected from sur-

collected on the center line, 2 m in front of the gun,

below the center samples that were collected in the

face soil. Samples were collected as far as 10 m beyond

wheel pattern. The concentrations of 2,4-DNT in the

the muzzle of the gun and the mean concentration of

the three samples collected at 10 m was still 19,500 g/

surface soil, in the soil segment from 0.5 to 5 cm, and

from 5 cm to 9 cm were 66,900, 955, and 458 g/kg,

kg.

A seven-sample set of surface soils was collected in

respectively. Thus it appears that there may be some

downward migration of 2,4-DNT, but with only one

a wheel pattern in front of Howitzer #1, 2 m from the

muzzle. This was done to assess the short-range spatial

set of samples, it is impossible to be certain.

17

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