US Government As Represented by the Secretary of the Army

Richard W Peterson

Philip Garcin Malone

Stafford S Cooper

Landris T Lee

Daniel A Leavell

John F Peters

An improved module and assembly for sampling liquids and gases within the ground is characterized by module housings containing sampling cavities having lateral openings to the exterior of the housings. Within each lateral opening a removable insert and piston assembly is provided. The piston is displaceable between open and closed positions within the insert in response to changes in pressure from pressure and vacuum sources. When in the closed position, the piston and insert are flush with the exterior of the housing to prevent contaminants from accumulating at the opening. When the module is inserted to a desired depth in the ground, the piston is displaced to the open position and samples from the soil at the desired depth enter the sampling cavity.

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Vicksburg, MS, United States of America

Richard W Peterson