Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
Corporation Rapid Optical Screen Tool (ROSTT)
The ROST is a tunable dye laser system used for the detection of petroleum, semi-volatile, and some volatile compounds in soils. The ROST consists of a modified cone penetrometer, monochromatic laser, tunable dye laser, detection system, and computer controls. The complete system consists of a 20-ton truck, hydraulic rams and associated controllers, and the ROST itself. The hydraulic ram advances segments of threaded push rod 1 meter long. The cone penetrometer, which is mounted on the end of the series of push rods, contains sensors that continuously log tip stress and sleeve friction used to map subsurface stratigraphy. Conductivity and pore pressure sensors can be driven into the ground simultaneously. The LIF (laser induced fluorescence) sensor, mounted slightly above the cone penetrometer sensor, accumulates fluorescence emission responses which are displayed with soil classification data. The field demonstration was held during September 1994.