af wai
crater.
e
At the crater's immediate edge (crater filled with water) readings
ranged from 40 to 100 uR/hour.
Scrap Metal (contact readings)
Large quantities of activated scrap metal were observed near the CACTUS
and LACROSSE Event sites.
Trenches excavated for the purpose of collect-
ing soil and ground water samples exposed considerable metal debris.
The
maximum reading observed on scrap metal was 32 mR/hour closed shield,
35 mR/hour open shield.
This piece of scrap metal, a partially buried
I-beam, was observed on the island road near bunker Hartack Station 182-01
(Greenhouse Station 57).
General scrap metal contact readings ranged from
100 wR/hour to about 8 mR/hour.
Alpha Contamination
Alpha contamination was detected along a 65 foot length of the berm on the
ocean side of the beach near the FIG Event.
The contamination was confined
to a vein of relatively dark sand, from 3 to 8 inches thick, found exposed
on the berm near Redwing Station 1311.05 (bunker).
The wet soil yielded
up to 3000 cpm (measured with a PAC-1S) on the vertical face of the vein,
Some black plastic sheeting and cables were observed in this layer.
To
determine the extent of the alpha contamination, a trench was dug between
the FIG SGZ and the beach,
of 8 inches.
Alpha contamination was detected at a depth
Two additional trenches, one 300 feet north and another 200
feet south of the FIG SGZ, just off the ocean side of the road, yielded
no detectable alpha activity to a depth of two feet.
However, alpha activ-
ity was detected on bunch grass located adjacent to the north trench,
Rojoa (URSULA), Biijiri (TILDA) and Aranit (SALLY)
~
.
General Description
Rojoa, Biijiri, and Aranit islands are three larger islands on the northeast portion of the atoll.
They are connected by a bridge (Rojoa and
Biijiri) and a causeway (Biijiri and Aranit).
All of the islands are
generally densely vegetated with the exception of the northeast end of