This method covers the laboratory procedure for determining the minimum resistivity of soil samples. The principal use of this test method is to determine a soil’s corrosivity and thereby identify the conditions under which the corrosion of metals in soil may be sharply accentuated. Note—When less than 5 percent of a material passes the No.10 sieve, this method may not be indicative of the corrosion potential of the material. This method covers the dry preparation of soil and soil–aggregate samples, as received from the field, for soil resistivity determination.