6
1992
5
1994
1995
1997
4
3
2
1
0
1
0.01
99
99.9 99.99
0.1
1
90 95
20 30
50
70 80
5 10
Percentile
Figure 16. Percentile plot of WP contamination of an intermittent pond site (Site 883).
1996
1998
m
m
20
20
18
18
16
16
14
14
12
12
White Phosphorus Concentration (g/g):
Not Detected
10
10
< 0.001
0.001 to 0.0099
0.01 to 0.099
8
8
0.1 to 0.99
>1
6
6
> 1 and Particles Found
4
4
Notes:
2
2
Grid size is 1.82 m by 1.82 m.
No particles were found in 1998.
0
0
0
2
4
6m
0
2
4
6m
Figure 17. Plot of WP concentrations in DWRC pen 5, Pond 183, Area C.
and 12 rows long (Fig. 17). In 1996, all 48 samples
was found, the concentrations were lower in 1998
contained detectable white phosphorus concen-
than in 1996, and no white phosphorus particles
trations ranging from 0.0024 to 421 g/g (Table
were found.
6). Over 300 white phosphorus particles were
found, one of which weighed 150 mg (Walsh et al.
CONCLUSIONS
1997). In the fall of 1998, white phosphorus was
undetectable in 20 of the 48 samples. The concen-
Remediation of white phosphorus through
tration range in the positive samples was 0.00062
enhanced natural attenuation using controlled
to 0.84 g/g. In all cases where white phosphorus
pumping is both feasible and effective. Wide areas
21
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