12 176
Height= 31 mm
144 mm
58
714
33
W
N
DNT
PMA-1A (EX-025)
April 1999
Surface Soil
TNT
Am-DNT
S
E
b. EX-025.
Figure 6 (cont'd).
Soil samples collected in July 1999
days versus 368 for the TMA-5 and PMA-1A mines
In July 1999, 188 soil samples were collected from
when these samples were collected, and the Type 72
the research minefield; 40 near PMA-1A mines, 69 near
mines were buried much deeper (burial depth was 15
TMA-5s, 72 near Type 72 mines, 1 from underneath a
cm to the top of the mine for Type 72, 8.5 cm for TMA-
PMA-2 mine, and 8 from control areas where no mine
5, and 2 cm for PMA-1A mines).
was buried (App. D).
The frequency of detection of ERCs in surface soils
The frequency of detection of ERCs was 46% for
was similar for the TMA-5 and PMA-1A mines (29%
soils near the TMA-5s and 50% for those near PMA-
for TMA-5s and 30% for PMA-1As). In both cases the
1As, but only 23% for the Type 72s (Table 19). How-
most frequently detected analytes were 2-ADNT, 4-
ever, the Type 72 mines had only been buried for 90
ADNT, and 2,4-DNT (Table 19). The patterns of de-
Table 19. Frequency of detection of ERCs in soil samples collected near buried
mines in July 1999.
Number of detections
Soil
Total soil samples (surface samples**)
Mine
samples
type
collected*
2,4-DNT
2,4,6-TNT
1,3-DNB
2-ADNT
4-ADNT
PMA-1A
40 (20)
20 (6)
18 (5)
19 (5)
17 (6)
20 (6)
PMA-2
1 (0)
1 (0)
1 (0)
0 (0)
0 (0)
0 (0)
TMA-5
70 (34)
28 (6)
25 (4)
21 (4)
31 (10)
32 (10)
Type 72
70 (33)
5 (1)
16 (2)
0 (0)
8 (0)
9 (0)
*Numbers inside parenthesis in the Soil samples collected column refer to the number of
surface soil samples that were collected for a given mine type.
**Numbers inside parenthesis in the Number of detections columns refer to the number of
surface soil samples in which ERCs were detected for a given mine type.
21
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