Co-axial well construction technique for hazardous waste assessment and remediation

摘要

A device for use in remediation of a multiplicity of adjacent subsurface geologic strata is described. The device comprises co-axially or concentrically positioned conduits installed in a borehole with an inner conduit extending below an outer conduit through a seal attached to the distal end of the outer conduit. The distal ends of both the outer, upper and the inner, lower conduits are perforated to allow the flow of liquids or gases through the conduits between ground surface and the geologic stratum adjacent to the perforated sections of both conduits. The annular spaces between the borehole wall and the unperforated portions of both the inner and outer conduits are sealed with impermeable barrier plugs to prevent flow parallel to the borehole axis between the borehole wall and the outer surface of the conduits. The annular spaces between the perforated sections of both conduits and the borehole wall is filled with a permeable granular filtration material.