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SUBSURFACE LANDFILL FIRE
SUPPRESSION AND MONITORING
A Case Study at the Campbell
Mountain Landfill, Penticton, British Columbia
Recommendations
for Implementation of Phases 2 and 3.
As mentioned in Section 2 of this document, a comprehensive three-phase
fire suppression plan was developed by the advisory board. Phase
1 involved the installation of an impervious clay cap over the
landfill crest in conjunction with shotcrete seals along
the landfill edge. Phases 2 and 3 involved the contingency of
a membrane cap over the clay cover and a grout seal at the landfill
crest, if required.
Installation of the Phase 1 clay cover
was completed in May 1998. Twenty-seven months of monitoring data
have been subsequently been compiled, and the following has been
determined.
- The fire has not spread from
the North Ravine into the main landfill,
- The clay barrier and shotcrete
seal has successfully cut off the oxygen supply to the fire
zone,
- The temperatures in the area
of the fire have followed a downward trend since the installation
of the clay cover.
In light of these results, it is apparent
that the clay cover and shotcrete seal are proving to be sufficiently
effective in suppressing the fire, and it is likely that no further
extinguishment measures (i.e. Phases 2 and 3) will be necessary.
SHA does however recommend that the monitoring program be continued
to confirm to date, and to determine the validity of the most recent
oxygen concentration results.
The temperature within the monitoring
wells and the integrity of the clay layer and biosolids will continue
to be monitored on a monthly basis while the gas concentrations
will be measured on a quarterly basis. In the event that the temperatures
in the North Ravine increase above 70 degrees C. significant increases
in temperature are observed in the monitors at the landfill crest,
the oxygen concentration increase is confirmed, or that desiccation
and/or cracking of the clay layer is noted, the option to implement
Phase 2 and Phase 3 contingency measures will again be revisited.
          
end of article.
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