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SUBSURFACE LANDFILL FIRE
SUPPRESSION AND MONITORING
A Case Study at the Campbell
Mountain Landfill, Penticton, British Columbia
The
Monitoring Plan.
In order to determine the effectiveness of the Phase 1 clay cover
and shotcrete seal oxygen barrier, and to provide monitoring locations
for subsurface temperature and combustion gases, SHA proposed
the installation of a series of boreholes in the North Ravine
area.
The borehole layout, which is shown
on Figure1, was developed with the
intent of providing the following:
- An accurate measure of the depth
of refuse along the length of the north ravine
- Determination, if possible,
of the extent of the landfill fire.
- Permanent gas and temperature
monitoring locations that could be used to monitor conditions
of the fire.
Boreholes GMW98-1 through GMW98-4
were installed along a section line through the length of the north
ravine in order to provide an accurate cross section of the area.
GMW98-1 and GMW98-4 were placed at the crest and near the base of
the slope respectively, while GMW98-2 and GMW98-3 were placed above
and below the sinkhole, which was the suspected location of the
main fire.
GMW98-5 was placed 30 metres from the crest of the north ravine,
and serves as the background well (with respect to natural temperatures
encountered in a landfill due to anaerobic decomposition).
GMW98-7 was installed in line with
GMW98-2 to monitor any movement of the fire towards the main body
of the landfill. GMW98-6 and GMW98-8 were installed in line with
GMW98-1 to provide a second line of detection behind the crest
of the North Ravine.
It is important to note that, although
installation of the wells after the clay cover was put into place
would have made the installation of the Phase 1 cover system easier,
existing temperature readings within the North Ravine were required
before the clay final cover was placed to provide a basis for
comparison through which the effectiveness of the cover system
could be assessed.
Figure1
Click on picture to enlarge.
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