Table 13. Characteristics of first set of Fort Leonard Wood soils.
Moisture @ Moisture @
Organic
CEC
Iron-ferrous, Total Kjeldahl
1/3 bar
15 bar
carbon
total exchangeable
Site
pH
(%)*
(%)
(%)
(meq/100 g) (ppm)
(mg/kg)
1
6.1
34.9
16.2
0.61
8.4
124
29.7
2
6.0
31.7
16.2
0.78
12.0
145
31.4
3
5.8
29.8
12.1
0.61
10.2
156
27.8
4
6.0
30.7
16.9
0.84
12.6
173
30.9
5
5.7
28.4
12.7
0.58
13.1
141
30.8
6
6.0
28.9
12.4
0.74
12.0
159
34.7
7
5.9
31.1
16.1
0.79
10.8
161
32.7
8
6.4
34.5
18.2
0.81
13.5
137
29.8
9
6.1
31.9
17.1
0.64
12.2
163
32.7
*Field capacity: water that the soil will hold after being saturated and allowed to drain under the
tension of the dry soil below.
Soil samples collected in August 1998 for
and 1.2 to 6.4 for 2,4-DNT (Table 15). For lower con-
characterization of land-mine-related
centrations of 2,4,6-TNT and 2,4-DNT, Kd values would
chemical signatures
probably be a little higher* (Leggett 1985). These
results indicate that ERCs should migrate relatively
In August 1998, the first soil samples were collected
unimpeded through soils in the solution phase, assum-
after the land mines were buried. The climatic condi-
ing that they are not chemically or microbiologically
tions at the time of collection were very hot and dry;
transformed.
conditions had remained very dry over the approxi-
mately 2-month period since the mines were buried.
In August, 143 soil samples were collected near 16
different mines: six PMA-1A mines, two PMA-2 mines,
*Personal communication with J.M. Phelan, Sandia National
six TMA-5 mines, and two TMM-1 mines (see App. A
Laboratories, 1999.
Table 14. Particle size distribution in first set of Fort Leonard Wood soils.
Hydrometer*
Sieve analysis†
% Clay
0.002
% Sand % Fines
0.75
% Gravel
Classification
<0.002
0.050
>0.050 <0.075
4.975
>4.975
Site
(mm)
(mm)
(mm)
(mm)
(mm)
(mm)
USCS**
USDA††
1
32.5
52.5
15
86.3
13.2
0.5
CL (sandy clay)
Silty clay loam
2
17.5
55.0
27.5
89.0
11.0
0.0
CL (clay)
Silt loam
3
7.5
25.0
67.5
42.2
42.7
15.0
SC (gravelly
Sandy loam
clayey sand)
4
22.5
47.5
30.0
85.5
13.5
1.0
CL (sandy clay)
Loam
5
37.5
47.5
15.0
86.2
10.5
3.3
CL (clay)
Silty clay loam
6
12.5
30.0
57.5
71.1
18.7
10.1
CL (sandy clay)
Sandy loam
7
15.0
22.5
62.5
84.9
13.2
1.8
CL (sandy clay)
Sandy loam
8
15.0
30.0
55.0
85.9
12.3
1.8
CL (sandy clay)
Sandy loam
9
15.0
32.5
52.5
81.8
15.7
2.5
CL (sandy clay)
Sandy loam
*Day (1956) as modified by Patrick (1958).
†Standard sieve method.
**Unified Soil Classification System (U.S. Army Corps of Engineers 1960).
††U.S. Department of Agriculture classification system (Gee and Bauder 1986).
13
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