2-in.-diam PVC pipe was rorced into
layer at each location is at least
the hole.
equivalent
a
The pipe was capped at the
bottom to prevent
the water depths
The slots
Before
the water in the wells was
above the waterline were taped over
sampled,
to prevent surltace debris from enter-
for one to two days.
“ing the casing from above.
in
Table 1.
soil from filling
the interior or the pipe.
to
The hole
it wag allowed to stabilize
The entire
pumping system was purged with at
was backfilled with the excavated
least 100 litres of water from any
soil,
respective well, and all collection
with the removed bottom soil
being returned to the pit first.
Table 1 gives
the depth
containers were thoroughly
rinsed
to
ninimize cross-contaminaltion of
to which
the slotted casing extends below the
samples.
surface of the water table and the
a battery-operated pump (Fig.
depth of the water table below ground
through a section of flexible plastic
surface.
tubing lowered into
the pipe below
were measured during periods of low-
the water surface.
The pumping rate
est tide.
could be regulated by a variable-
Most of
these water depths
We detected no differences
in conductivity
throughout
Samples were withdrawn by
2)
speed control over the range from a
the acces-—
sible length of each water column.
few millilitres per minute to &
The
litres per minute.
thickness of
the freshest water
Table 1.
Tsland
Bikini
HEH
HEU
HEH
HFH
HFH
1.21
O.73
0.87
0.82
QO. 73
2.48
2.72
2.33
2.80
2.07
FWR 1
0.54
2.43
FWR 3¢
9.0
4.0
--©
-¢
FWR 2
FWR 4@
a
Old well.
Depth of water table
below ground surface (mn)
L
2
3
4
5
FH 72
Enec
Depths of wells at Bikini and Eneu Islands.
Depth of well. casing
below water table (im)
Well
Conductivity was
b
0.6>
QO. 81
.
Open well under block casing.
dy
1.92
c
Not measured.