Table 1. Particle Size Distribution of Three Surface Soil Samples From Area 13 (Results Expressed in Percentage by Weight) Sample No. Size Range (um) 6A 6B 6C > 2000 2000-840 840-250 250-125 125-53 53-20 20-5 5-2 < 2 10.3 7.1 18.4 17.4 21.0 9.9 9.1 3.9 2.3 10.1 7.3 18.8 17.1 16.6 8.9 10.9 6.3 4.1 12.6 9.8 27.2 18.1 14.0 5.8 6.4 3.0 3.0 Total 99.4 100.1 99.9 -