This Practice will describe the OIP probe and system used to conduct subsurface logging for light nonaqueous phase liquids (LNAPL) that fluoresce under ultraviolet (UV) or green wavelength light. The steel OIP probe is advanced by direct push methods into soils and unconsolidated formations while a downhole camera captures images of LNAPL fluorescence through a sapphire window on the side of the probe. An ultraviolet light emitting diode (UV LED) illuminates the formation outside of the window to induce fluorescence of many hydrocarbon fuels. Alternately, an OIP probe equipped with a green wavelength LED may be used to induce fluorescence of coal tars or creosote. The amount of fluorescence observed is plotted on a graphical log versus depth as logging proceeds. Additionally the probe includes either a visible light LED or infrared LED to obtain images of formation texture at selected depths. Fluorescence, visible light or infrared images are presented onscreen and saved to file for later review. The OIP probe includes both an electrical conductivity array and a hydraulic profiling tool (HPT) sensor to assist in definition of formation lithology as the probe is advanced.
KeywordsUV fluorescence; Direct Push Logging; LNAPL; Petroleum Fuels; Coal Tar; Creosote; Light Emitting Diode (LED); Sapphire Window; CMOS camera
The OIP system provides a new and innovative tool and method for the detection of LNAPLs in the subsurface. Geo-environmental professionals and regulators will use the OIP system to detect and define the extent of LNAPL contamination which is critical for defining hazards, human and environmental risks at many contaminated facilities. OIP logs can be used to develop accurate conceptual site models and remediation actions for site cleanup.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Wesley Mc Call
Draft Under Development