Barrier Membrane Containment (BMC){trademark} is a high-density polyethylene membrane (HOPE) groundwater barrier and pass-through system, with applications ranging from plume control and containment to groundwater manipulation coupled with in-site treatment. BMC{trademark} system can function as a permeable or impermeable reaction wall, a cut-off wall, interceptor trenches, a barrier with collection and/or monitoring system and a pass-through in a funnel and gate configuration. BMC{trademark} can be inspected with a down-hole video camera, producing a permanent VHS format tape, insuring the integrity of the wall and the interlocking joints. The joints are sealed with a U-packing elastomeric gasket to prevent the flow of fluids or gases.