APPENDIX A PROTOCOL FOR A SPECIAL STUDY AT NUCLEAR SITE 201 TO ESTIMATE THE RELATIONSHIP BETWEEN 241an CONCENTRATIONS AND THE SIZE OF SOIL ALIQUOT Prepared by R. O. Gilbert and E. H. Essington April 14, 1977 1. At a distance of 150 ft along the established transect? from ground zero (GZ) at Nuclear Site 201 collect 24 surface soil samples, 6 samples along each of 4 east-west lines. The 4 lines and the 6 samples in each line should be as close together as possible (see diagram below). However, samples should be taken with care to avoid disturbances of sampling locations. One approach would be to lay a board over lines 2, 3, and 4 while collecting the 6 samples on Line 1. Then move the board to expose Line 2, etc. The samples are to consist of the standard NAEG surface ring sample (12.7 cm diameter to a depth of 5 cm). rocks (>1 in. Large in diameter) may be removed and discarded from the sample after placing any soil attached to the rock in with the soil sample. Discarded rocks should be returned to the hole left by the samples. If 150 ft from GZ is a very rocky area, move along transect until a less rocky area is found. Do not go beyond 200 ft. Samples may be taken as close as 100 ft from GZ if necessary. Record location where samples were collected as well as general terrain features of the sampled area. Sample 4 5 6 FW Line 3 hw 12 A line 1000 ft from ground zero at an azimuth of 326° and thence for an additional 500 ft at azimuth of 331°. 439