Detonation Crater
Visible Plume = 81 m 2
Visible Plume Sampled = 6.0 m2
East
m
6
3
S4
0
S3
S2
S1
3
6
3
0
3
6
9
12
15
18
21
24
27
30 m
West
b. Second detonation.
Detonation Crater
Visible Plume = 74 m 2
Visible Plume Sampled = 4.6 m2
m
East
6
3
S4
S3
S2
S1
0
3
6
30 m
3
0
3
6
9
12
15
18
21
24
27
West
c. Third detonation.
Figure 4 (cont'd). Residue deposition and surface snow samples collected for 81-mm mortar round detona-
tions at Camp Ethan Allen.
night, which melted the snow. Small quantities of ice
the condition of the snow in the various locations, but
remained in the bag in the morning, indicating that the
averaged about 0.5 cm. The order of collection of sam-
samples had remained at 0C during this period. The
ples was from the farthest distance from the crater to
snowmelt was black because of the presence of sus-
the closest to avoid walking on areas that were to be
pended soot particles. Once the last of the snow melted,
sampled. For collection, snow was shoveled into plas-
all of the water in the bags was filtered (Whatman glass
tic bags that were sealed with twist ties. The bags were
microfiber, 47 mm, grade GF/A) to remove the soot.
polyethylene that had been specially cleaned by the
As many as 15 individual filters were required for a
manufacturer for snow sampling. Snow samples were
given sample, depending on the amount of soot present.
returned to CRREL the same day that they were col-
Filters were retained and were extracted separately, as
lected and were processed the following morning.
described below. A bag blank with reagent grade water
was processed in an identical manner to ensure that no
Processing of snow samples from
interferences were generated by the plastic bags used
Camp Ethan Allen
for collection.
The plastic bags were left in the laboratory over-
4
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