Specifie grid designations for the three potential experimental areasare:
PLOW X-1
PLOW X-2
NW
Sampling
Date
SW
PLOW X-3
NW
1-13 2-13
0-11 1-113-3
3-4
1-142-14
0-12 1-12 4-3
4-4
1-15 2-15
0-13 1-13 5-3
574
1-16 2-16
0-141-146-3
6-4
18 May 78
25 May 78
26 May 78
The Plow X-] plot was chosen because it showed the highest surface concentrations of TRU on the
island; was in an area relatively clear of vegetation and debris had not been a heavily vegetated
area when the cleanup project began (see EG&G aerial survey photos of 1972); was in the original
IMP 25 meter "test grid" area and in one of the final 25 meter grid areas for which lots of data have
been recorded; and lastly, soil samples were collected and analyzed previously in the surface to 20
em depth at stake location NW 2-14 (allowing comparison of the data over time and by two
different sampling techniques).
Following collection of the soil samples in the Plow X-1 area, the ERSP Manager suggested samples
be collected in areas where the surface concentration of TRU was less than 50 pCi/g. He and the
DRIStatistician reviewed the IMP data and recommended three additional areas based solely on the
IMP data, namely: (1) in the SE quadrant 100 meters or so south of the three story structure
(already a pile of rubble by this time) and to the east of the road leading to that structure; (2) in
the NW quadrant between the beach and the runway north of the LLL farm; and (3) in the SW
quadrantdirectly east of the LLL farm.
The ERSP Tech Advisor and the EIC Soil Sampling Supervisor visually checked the areas suggested
above for appropriateness to sample (i.e., level, clear of vegetation and debris, etc.). It was also
considered desirable to select areas in which the IMP had made measurements on a 25 meter grid,
although this latter consideration was not essential.
Based on the above criteria, we selected the other two plots, Plow X-2 and X-3. Both of these
plots were chosen in areas which were windrowed as part of the brush removal program prior to
surveying or IMP measurements. Now, only ground cover type vegetation (grasses and morning
glory vines) is present in those two areas. The Plow X-2 plot is north of the old LLL trailer site and
in an area about 100 to 150 meters south of the line of concrete pads and bunkers which extended
west from the large 3-story structure. Consequently, there may be some shrapnel or other debris in
the X-2 area from the blasting which has occurred to effect removal of those structures. No
obvious debris was noted during the soil sampling effort.
The Plow X-3 plot is located in an area 200 to 300 meters north of the debris removal effort noted
above. It is located within one of the areas where IMP measurements were made on a 25 meter
grid, between two of the original windrows. The area between those two windrows contains some
surface asphalt and concrete, especially just to the southwest of the 8-stake plot chosen.
All three potential plowing experiment plots are delineated in the field with 1.5-to 2-m long red
posts of wood or aluminum pipe to stake out the corners of each area. Because there is a lot of
debris removal activity on the island, including blasting, the military supervisors on island were
instructed to request their personnel keep all vehicles out of those designated areas.
All soil sampling for the three experimental plots was done by the Navy soil samplers under EIC
supervision and at the request of the DOE Tech Advisor. Soil samples were collected at each of the
24 grid locations (8 per plot) using the techniques given in DOE/ERSP Procedure No. 4, "Soil
B-9-5