Correct use of cone penetrometer sensors to predict subsurface conditions Page: 3 of 8
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-LT :- * *LT 06
LT 02 LT B -
L 17L02 L 10 "0 * c
LT03 *LT 01
LT 09 Saddles
DOE Storage Tank Area
PTrI LOG 1995
5 tO 15
Figure 1. Locations of CPT sampling and sensor data
collection and of soil core holes at the DOE site.
stressed, in the cover letter accompanying the final
report (Fugro 1995), that because the soil behavior
chart was empirical, the soil identification should be
verified locally. Nevertheless, the only additional
work performed was the collection of 23 soil samples
for laboratory analysis for total petroleum
hydrocarbon (TPHs) (Burbage et al. 1996). Soil
sample locations were selected on the basis of peak
signal responses by the ROSTTM sensor. Figure 2
shows 4 of the 14 data logs produced for the CPT-
ROSTTM sensors and the results of chemical analysis
of the soil samples collected at those three locations.
In June 1996, Argonne National Laboratory,
under contract with DOE, used the same area for an
evaluation of LIF sensor technology (Argonne
1996). The site was selected for Argonne's work
because it was believed to be fully characterized for
fuel contamination and to contain the contaminant
concentrations needed for the evaluation. However,
Argonne's review of the previous CPT, ROSTTM,
and soil sampling data revealed that the results of the
soil sample collection did not support the ROSTru
sensor data, which had produced both false-negative
and false-positive readings (Figure 2). Therefore,
during Argonne's evaluation, two core holes were
drilled and logged in detail by a geologist, then
sampled continuously for petroleum hydrocarbon
analyses (PAHs [polynuclear aromatic hydrocarbons]
and BTEX [benzene-toluene-ethylbenzene-xylene])
to establish site control. After samples were collected
for chemical analysis, the remaining core was sent to
a geotechnical laboratory for grain analysis with a
microscope. Each core hole was placed immediately
adjacent to a CPT-ROSTTM data collection location
from the 1995 study in order to confirm earlier
results (with core hole LO1 adjacent to LT5B and
core hole L02 adjacent to LTO2).
Argonne began by logging the core. Figure 3
compares the original CPT log as interpreted by the
S 3 ft 250 ppm;
1 1 *
12 -12ft 7 ppm
4 21 f 940 ppm
26 '11 i ... r 26 ft 5.1 ppm
I) 5 10 IS 20 23 30 35
% Relative Floureacence Intensity
Is I 14 ft 43 ppm
25- -25 ft 0 ppm I
11 0 13 '0 25 30 35
Figure 2. Results from the ROSTTM sensor
investigation with soil sample results for the
DOE site (as modified from Fugro 1995).
soil classification software program on the truck with
the core hole log described by the geologist and the
laboratory after microscopic examination. Some
major discrepancies are apparent. At location L02,
the soil boring log was described by the geologist as
being dominated by silt and clay in the upper 4.9 m
(15 ft) and by sand at 4.9-9.5 m (15-29 ft). The
CPT computer-generated soil classification log at this
location identified the material at 9.8 m (30 ft) as
clay, with sand and silt layers at 6.9-8.2 m
Soil Sample Depth and
* % Relative Fluorescence '
Intensity as read by the
* II I
4 ft u
5 u 5 U
33 = 1 1
5 10 IS 20 25 30 35
~~ 9ft 3600 ppm
i u I
40 .___.._4.........i -
02 5 V01 22 ft60 35m
% Xelativ Ft u es e Intt
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Walker, J.L.; Rose, C.M.; Armstrong, S.C. & Burton, J.C. Correct use of cone penetrometer sensors to predict subsurface conditions, report, September 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc694613/m1/3/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.