31 Jan 96
in-situ sparging device for sampling groundwater, and a thermal
desorption soil sampler; all for VOC sampling. Sensors under
development include one for heavy metals utilizing laser-induced
breakdown spectroscopy, and volatile organics/solvents sensor
using fiber optic Raman spectroscopy.
(1) Geotechnical: Tip resistance and sleeve friction are
recorded versus depth at 20 mm intervals. These data are
recorded in ASCII form on the system computers. The push rate is
hydraulically controlled, however dense material may slow down
the rate of advance.
(2) Laser Induced Fluorescence: Fluorescence data are
collected as the cone penetrometer is continuously pushed at a
rate of 20 mm/sec. One data point represents approximately 40 mm.
The rate of data collection is computer controlled, however the
rate can be adjusted by the operator. Returned light intensity
versus wavelength is recorded digitally as binary data for each
data point. The maximum intensity and corresponding wavelength
versus depth are also displayed in real time on a computer screen
panel plot as the push is in progress. Hard copies of the panel
plots are produced at the end of a push. Data storage and
retrieval are possible by acquiring the data on the hard drive
and transferring the data to a removable disk at the convenience
of the operator.
h. 3-D Visualization: 3-dimensional visualization of data
is currently available through WES. SCAPS districts should have
this capability in FY96 with either Silicon GraphicsTM or
i. Field Testing Options: Soil and water samples collected
with SCAPS can be analyzed in the field to enhance decision-
making capability. Immunoassay test kits and field gas
chromatographs are available to provide near-real-time
contaminant identification. This allows SCAPS to provide a
flexible, optimized site characterization program. An Ion Trap
Mass Spectrometer will be available in FY96 for field analysis of
volatile organic compounds.
(1) Geotechnical Validation: The cone penetrometer probe
does not produce samples for direct observation of soil types.
This can be overcome by comparing sensor results to existing
stratigraphic information. Most HTRW sites have been