ETL 1110-1-171
31 Jan 96
(2) The truck is divided into two compartments separated by
a wall with a viewing window. All walls are stainless steel for
ease of decontamination (if necessary). Push rods can be
automatically decontaminated below the truck as they are
withdrawn from the push hole. This arrangement minimizes crew
exposure to potential contamination and crew down time for
decontamination.
(3) The current SCAPS has three in-situ sensing
capabilities: defining soil stratigraphy, detecting polynuclear
aromatic hydrocarbon (PAH) contamination with laser induced
fluorescence (LIF), and profiling resistivity. The LIF sensor is
mounted on a cone penetrometer probe so that soil classification
data and fluorescence data are collected simultaneously. The
resistivity sensor is mounted on a separate cone penetrometer
probe so that resistivity and soil classification data are
collected simultaneously. Sensors are connected to electronic
signal processors through wiring bundled together into an
umbilical cord. The umbilical cord also contains a grout tube so
push holes can be sealed as the penetrometer is withdrawn. Two
optical fibers are contained in the LIF sensor umbilical. An
umbilical and sensor probe are supplied as one unit. Data are
handled by an on-board computer system and electronic signal
processing equipment. Sensor data are collected every 20 mm and
displayed in the form of panel plots as they are acquired. The
LIF and resistivity sensors are mounted on separate cone
penetrometer probes; therefore separate pushes are required for
each sensor.
(4) The SCAPS can also be used to collect ground water,
small volume soil samples, and to install small diameter wells.
Each physical sample obtained or well installed also requires a
separate push.
(5) Subsurface conditions and rod diameter affect push
depth. Equipment includes two sets of push rods; one set has an
O.D. of 44.4 mm and the other set has an O.D. of 36.6 mm.
Pushes can be made in geologically suitable materials to
approximately 24 meters using 44.4 mm outer diameter (O.D.) rods
and 46 meters using the smaller diameter rods.
(6) The truck is 4.1 meters tall, 2.6 meters wide and 10.7
meters long. The SCAPS truck also has a 4.3 meter long, 2.4
meter wide support trailer containing a 1135 liter water tank, a
grout pump, and a high pressure hot water cleaner.
3
Previous Page
