Field Work

Field work should be conducted in accordance with government regulations.  The regulations were set in place to preserve the quality of sample collected.  The methods and materials used are important because the behavior of contamination varies depending on the chemical makeup and the environment where it is located.  For example, the concentration of volatile organic compounds (VOCs) will decrease when exposed to air.  As a result, when VOC soil samples are collected they are immediately placed in a jar with a known volume.  The laboratory can then calculate the amount volatilized in the air of the jar.  Groundwater samples with potential VOCs are typically collected by using low-flow sampling techniques.  By using low-flow sampling techniques  there is minimal disturbance to groundwater and exposure to air.  The samples are carefully placed in jars with no headspace and sent to the laboratory for analysis.