Table 3 reveals that, averaging the two repeats of the base case,
the fraction of TCE residing below the heater-due to remobilization
during preheating period was 1.7% of the initial mass, and the
fraction of TCE volatilized was 75.5%. Less than 1% of the volatilized
TCE was generated during the pre-heating stage, 84% was generated
during the combustion phase, and almost 16% was generated during
the cooling stage. Assuming the difference between the total
mass of TCE observed (in gas and post-test sand) and the initial
TCEmass is due to destruction/conversion by combustion processes
suggests that, in the base case, approximately 21% of the TCE mass
was destroyed (i.e., primarily converted to CO and CO2) (Table 3
final row).