Abstract: A portable core sampler includes a portable electric drill having an output rotary shaft connected detachably to a coupler shaft that supports a water swivel which connects a source of water to an axial water delivery passageway in the coupler shaft. The passageway in the coupler shaft communicates with the water delivery passageway in an elongated core sampler tube connected detachably to the coupler shaft, either directly or through one or more spacer tubes, for simultaneous rotation with the coupler shaft. The end of the core sampler tube opposite the coupler shaft includes core cutting elements for cutting core material for collection in the core sampler tube. Water injected into the system assists the cutting elements in cleanly cutting sub-surface materials by removing heat and cuttings. An inner shoulder in the sampler tube supports a core sample in the core sample tube during retraction of the tube assembly from the sub-surface.

Abstract: Biodegradation of gasoline by microorganisms in soil and groundwater is achieved by improving the growing conditions for petroleum degrading microorganisms in the subsurface by introducing oxygen containing gas and soluble nitrogen into a system of closely spaced aeration columns extending vertically in the soil to below the groundwater surface. As the gas rises through the groundwater in the columns it oxygenates surrounding soil and groundwater and raises the water level in the columns above the groundwater table. This water level differential induces groundwater migration in the columns and in soil surrounding the columns, providing limited vertical circulation of groundwater in the soil.