area was a strip approximately 1.5 m wide and 65 m long parallel to the east beach line while the
other was approximately a 15 x 8-m rectangle located on the northwest beach line of Kickapoo.
These boundaries were deterrnined using portable instruments. A beach rock sample was collected

and analyzed which verified that the ratio had not changed.

Some data in these areas still indicate high TRU concentrations even after a diligent effort was
made to remove the TRU activity, including hand sweeping and washing with high pressure water.
After an attempt to serape the activity from a piece of coral from one of these areas failed, it was
determined the contamination left was fixed and the surface soil criteria no longer applied. In

addition to this "Kickapoo hot strip" problem, small pieces of contaminated metal fragments still

remain along the beach and are continually washed ashore. Periodic efforts were made to pick up
these pieces of metal but more are likely to continue to wash ashore.

The total TRU activity removed from the Kickapoo area was estimated to be 0.85 curies based on
final data with 4207 eubie meters (5503 cubie yards) of soil removed. The method for calculating

activity removed is shown in Tech Note 10.0.

The second area where soil removal occurred was Yuma.

IMP measurements were taken on a fine

grid of 25 m, along with some at 12.5-m, in March 1978. Additional surface soil samples were
eollected to check the ratio of 3.37 which was not verified. After analysis of the data, the new ratio
computed was 5.31 + 0.20 with this ratio being consistent throughout the cleanup of Yuma. Like the

cleanup of Kickapoo, a debris/brush removal occurred before any soil lifts were taken and the area

was measured by the IMP on a 12.5 m grid with the detector at half-mast.

Two distinet lifts were made following this debris/brush removal, apparently based on the boundaries
first drawn on the 50 m grid data, with the second lift overlapping the first in some places. These
lifts did not encompass the whole area that was initially estimated to be over 40 pCi/g.

IMP

measurements were taken after each of these two lifts in April and May 1978 along with subsurface

soil samples collected in these areas.

Cleanup boundaries had been based on 40 pCi/g average TRU activity up to this point but it was
decided to clean up only the areas with TRU activity greater than 80 pCi/g. Using this criterion,
new boundaries were drawn on the IMP data and subsurface data were collected after the first two
lifts to indicate surface and subsurface TRU contamination greater than 80 pCi/g.
After the third lift was complete, the area was measured by the IMP in June 1978 with the data
showing a fourth lift was necessary to get below 80 pCi/g. After the completion of this lift, IMP
measurements were taken in July 1978. These results indicated all 0.25 hectare average TRU to be
less than 80 pCi/g, though not less than 40 pCi/g. To achieve the 40 pCi/g level, only one small area
would have to be removed. Following the excavation of this area, more data were taken around the
area whichstill showed TRU concentrations greater than 40 pCi/g, thus another lift was done. IMP
measurements collected following this lift showed no 0.25 heetare average TRU activity greater
than 40 pCi/g.
The final estimate of TRU activity removed from the Yuma site is 0.28 curies and the estimated
cubic meters removed is 2523 (3330 cubie yards). This area is not in the same radiological condition
as it was immediately following the soil removal. A PACE restoration effort that was undertaken

later in the project changed the appearance and the radiological condition of this area.

The third area on Sally requiring soil removal was Hustead. Some fine grid IMP measurements were

taken in February 1978 with additional IMP data collected in May 1978. No soil samples had been
collected in this area for characterization but in March and May of 1978, surface and subsurface soil
samples were collected. A ratio of 5.16 + 0.22 was computed for this area and boundaries were
drawn showing the surface and subsurface areas with TRU activity greater than 80 pCi/g.
Following the first lift, the area was measured by the IMP and the results indicated another lift was
necessary to get the TRU activity below 80 pCi/g. After the completion of this second lift, the area
was measured by the IMP with the original results indicating no 0.25 hectare average TRU greater

than 40 pCi/g.

Based on the final data though, the highest 0.25 hectare average TRU was
330

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