What characterizes a disturbed soil sample?

• A. It is collected using thin-walled tubes
• B. It typically shows minimal alteration
• C. It is taken using auger or hand-operated rigs
• D. It represents undisturbed natural conditions

Answer: (C)

A disturbed soil sample is characterized by the method of collection, which often involves using tools such as augers or hand-operated rigs. These methods can alter the soil structure and characteristics during retrieval. When soil is disturbed, it may not accurately reflect the original physical or chemical properties of the soil in its natural environment due to factors such as compaction or mixing.

In contrast, options that propose characteristics of disturbed samples, such as being collected with thin-walled tubes or representing undisturbed conditions, do not apply. Thin-walled tubes are typically associated with undisturbed sampling techniques that minimize soil alteration. Similarly, a disturbed sample would not show minimal alteration, as the very process of its collection tends to change its structure and composition. Therefore, the correct understanding of disturbed soil hinges on the collection method, which clearly aligns with the use of augers or hand-operated rigs.