Group of 4 Adjacent Samples l ' 4 3 —= 5 in. + t —_—- The samples are to be taken along the sampling lines indicated above unless two or more of the groups of four samples in the line happens to fall on a man-made disturbance (such as down a road) or a disturbance caused by grazing cattle (e.g., down a path leading to a watering trough). In such cases the following lines are to be substituted for the original lines given above. Original Substitute Line Line N935900 N936025 N939700 N939800 If only one or two groups of four along the line are in these disturbed areas then follow the procedure in item 15 below. Before inserting the 4 sampling rings take FIDLER readings 1 ft above each of the 4 sampling points and at the center of the 4 sampling points a total of 5 FIDLER readings per station. Insert 4 sampling rings and take 4 FIDLER readings at the surface of the sampling point - a total of 4 additional FIDLER readings per station. be taken at all 30 stations. FIDLER readings are to The FIDLER used in number 7 above should be equipped with an integrater rather than a rate meter. 10. If soil sample locations are under or adjacent to shrubs that will influence FIDLER readings and/or interfere with the subsequent collection of soil, these shrubs or vegetation are to be cut away at ground level and removed from the immediate area before FIDLER readings are taken. The soil to be sampled must not be disturbed in the process of removing vegetation. ll. The 5-in.-diameter soil-sampling ring should be pushed flush into the soil to a uniform depth of 5 cm on all sides of the ring. Hence, if a sample falls on the sloping surface of a blow-sand mound the ring should follow the slope of the mound (not be placed horizontal to level ground). a 447