Random sampling is not a common soil sampling method because it does not provide a representative sample of the soil contamination.

Soil sampling is conducted to determine the extent of contamination, identify the contaminants present, and assess the risk to human health and the environment.

Gas chromatography-mass spectrometry (GC-MS) is a commonly used analytical method for identifying organic contaminants in soil due to its high sensitivity and selectivity.

The primary objective of soil remediation is to remove or reduce the concentration of contaminants in soil, prevent the migration of contaminants to groundwater or surface water, and restore the soil to its original condition.

Excavation and disposal is not a common soil remediation technology because it is expensive and can be disruptive to the environment.

Bioremediation is the process of naturally reducing the concentration of contaminants in soil through the action of microorganisms.

Land use is not a factor that affects the rate of soil contamination.

Phytoremediation is the process of using plants to remove contaminants from soil.

Reduced soil porosity is not a common soil contamination indicator.

In situ chemical oxidation is the process of using chemicals to oxidize and destroy contaminants in soil.

Landfilling is not a common soil remediation strategy because it can be expensive and can pose a risk to human health and the environment.

Soil washing is the process of removing contaminants from soil by washing it with water or a chemical solution.

Natural processes are not a common soil contamination source.

Risk assessment is the process of assessing the risk of soil contamination to human health and the environment.

Air monitoring is not a common soil contamination monitoring method.