In a secure groundwater source, surface waters slowly infiltrate through overburden materials such as soil, silt, or sand over a period of months to decades.

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This is correct. In a secure groundwater source, surface waters do slowly infiltrate through overburden materials such as soil, silt, or sand over a period of months to decades, removing contaminants along the way. This process is known as natural attenuation.

In a Secure Groundwater Source, Surface Waters Slowly Infiltrate Through