What is a potential disadvantage of using the Driven Method?

The Driven Method, often used in groundwater sampling and monitoring, has specific operational limitations. One of the primary disadvantages of this method is that it is most effective in loose, unconsolidated formations such as sands and silts. In these types of materials, the driven points can be easily infiltrated and yield reliable data. In contrast, in solid rock formations, the installation can be challenging and often ineffective, which is why this method is not typically deployed there.

The configuration of driven points in unconsolidated materials allows for better hydraulic conductivity, facilitating water movement into the sampling device. When dealing with rock formations, alternate techniques such as drilling may be required. Thus, if the site's geological characteristics are predominately unconsolidated, the Driven Method can have limitations, making it less suitable for use in other geological contexts.