Repeat the above procedure at a distance of 1050 ft from GZ along the transect. 2 If rocky or graded area is encountered, samples can be collected elsewhere along transect between 1000 and 1100 ft. Be careful not to locate sampling point on a graded road or berm. Dry the 48 samples according to established NAEG procedures. Ball mill each of the 48 samples for 5 hr. Screen each ball~milled sample collected at 150 ft through a 10-mesh screen. Weigh each fraction, then combine the <10-mesh fractions of each of the 24 samples in a plastic bag; mix by kneading until the mate- rial is thoroughly mixed (at least 10 minutes). Place the >10-mesh soil collected at 150 ft in a separate plastic bag and mix by kneading for 10 minutes. Set aside until Step 12 below. Spread out the <10-mesh soil in the shape of a circle on a clean plastic sheet. Divide the soil into 4 approximately equal quarters using a clean straight edge. For each quarter do the following: a) Transfer the soil to a clean plastic sheet and spread out uniformly b) Divide soil into 5 approximately equal pie-shaped parts using a straight edge. c) Transfer each part into a separate plastic bottle. d) Record dry weight of soil in each bottle. e) Assign library numbers to each bottle. into the shape of a circle. Number the 20 bottles from 1 to 20; numbers 1 - 5 for quarter l, 6 - 10 for quarter 2, 11 - 15 for quarter 3, and 16 - 20 for quarter 4. 10. Five aliquots, one each of 1-g, 10-g, 25-g, 50-g, and 100-g size, are to be taken from each of the 20 plastic bottles. Look up the order in which the different size aliquots are to be taken from the bottles by referring to the attached "Schedule for Taking Aliquots." (about 5 g) for all aliquot sizes. Use the same size scoop For example, the 100-g aliquot will require about 20 scoops using a scoop holding 5 g. Rotate the bottle of soil (corner to corner) about 5 seconds before each sample (aliquot) is taken. The soil must not be poured out to obtain aliquots. Assign aliquot numbers to the 100 aliquots. Record the dry weight of each aliquot. Store soil remaining in bottles in the soils library. 2 These samples were stored but have not been analyzed as of October 1978. 440