Figure 11. Estimated frost depth

Figure 9. Thermocouple configuration

Figure 12. Variability of unconfined compressive strength for December and March Clegg data

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7

and solar panels were used to recharge the batteries.

that the soil present at the Raymark Superfund site

freezes at 0C. This is a workable assumption since

Figure 10 shows the datalogger and the solar panel

mounted on the PVC pipe.

fill materials are fairly open materials. After re-

A summary of all the temperature data for each

viewing the data, we selected the daily tempera-

string has been plotted and is provided in Appendix

ture at 1000 hours for locating the frost depth.

A. Table 1 summarizes the total number of days that

There was not a significant difference in the tem-

temperature data were recorded at each site.

perature changes when other times of the day were

As shown by Table 1, sites 10 and 20 collected 83

days worth of hourly temperatures. The datalogger

The contour plots (Fig. 11) show that frost pene-

at site 30 did not work properly between December

tration did occur in all of the materials during a

2027 and no data were recorded. A field trip was

portion of the month of January and February. The

made to replace a faulty multiplexer board, and

contour plots show that the frost depth reached a

temperature data were recorded for the remainder

maximum of approximately 500 mm. Table 2 pro-

of the testing period. This disruption occurred prior

vides a summary of the maximum frost penetra-

to the frost depth penetrating into the soil and did

tion recorded at the thermocouple sites.

not affect the data.

A maximum depth of frost penetration of

Using temperature, time, and depth, we then

230 mm was recorded at site 10. This site was located

mapped the data on a contour plot and the 0C iso-

on a south-facing slope in a relatively sheltered

material storage area that inhibited frost penetration.

therm was located. This is based on the assumption

b. Thermocouple site 20

a. Thermocouple site 10.

c. Thermocouple site 30.

d. Thermocouple site 40.

Figure 11. Estimated frost depth.

Western Governors University

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