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Pesticide Safety Education Program (PSEP)
Part of the Pesticide Management Education Program

Permeability of the geologic layers between the soil and groundwater is also important. Highly permeable materials, such as gravel deposits, depicted on the left, and highly fractured rocks, depicted on the right, allow water and dissolved pesticides to move freely downward to groundwater. Layers of clay, on the other hand, are much less permeable and thus inhibit water movement.

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Protecting Groundwater: A Guide for the Pesticide User

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Slide 22 of 63