Solar
PVC pipe
Panel
for mounting
Datalogger
3 meters
Thermocouple cables
Conduit for thermocouple cables
(String A)
Total
depth
Subbase soil or
Thermocouple rod
(910 mm
sand material
below
surface)
Thermocouple sensors
set at 230 mm intervals
Figure 9. Thermocouple configuration.
just below grade, to allow temperature readings at
base material identified as J.J. Brennan fill, and site
the surface of the soil layer. Hand augers were
40 was placed in the sand material, which was
used to bore the holes into which the thermocou-
used for the gas collection layer above the waste
ple rods were inserted. Thermocouple sensors were
material. Each location for thermocouple place-
located in 230-mm intervals from the surface to a to-
ment was selected based on a minimum of
tal depth of 910 mm. The dataloggers recorded
910-mm coverage of the geosynthetic materials
hourly temperature changes at each depth. The
and waste material. Thermocouple strings were
thermocouple unit operated from battery power,
not installed in the stabilized waste material. The
assumption was that temperatures recorded at the
four thermocouple sites would be also representa-
tive of the waste material.
At each site, two thermocouple strings were in-
stalled (string A and string B). String B was in-
stalled as a backup in the event of failure of string
A. Figure 9 provides a sketch of the thermocouple
equipment setup.
A PVC pipe was implanted into the subbase
material and used to mount both the datalogger
box and solar panel. From the base of the datalog-
ger housing box, thermocouple wires ran down
the PVC pipe, through a 3-m-long conduit to the
rod with the thermocouple sensors attached,
which was inserted into the soil layer to a depth of
910 mm. One conduit was used for each thermo-
couple string to protect the wires from foot or
vehicle damage. The thermocouple string started
Figure 10. Datalogger installation.
Table 1. Summary of temperature data recorded at all ther-
mocouple sites.
Site
Material
Date started
Data collected up to
Total days
10
Tilcon
19 December 1996
19 February 1997
83
20
Tilcon
19 December 1996
19 February 1997
83
30
J.J. Brennan 19 December 1996
19 February 1997
74*
40
Sand
8 January 1997
19 February 1997
62
*Note: data were not collected at location 30 from 20 December
through 27 December.
6
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