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SUBSURFACE LANDFILL FIRE
SUPPRESSION AND MONITORING
A Case Study at the Campbell
Mountain Landfill, Penticton, British Columbia
Gas
Concentration Measurements.
(continued from previous page)
| Table
4 Gas Concentration
Measurements |
| Well |
Oxygen
02 in % |
Hydrogen
Sulfide H2S ppm |
Carbon
Monoxide CO in ppm |
| GMW98-1B
|
0.0
to 0.1 |
0
to 5 |
140
to 303 |
| GMW98-2B
|
0.0 |
14
to 77 |
465
to >999 |
| GMW98-3B
|
0.0
to 0.1 |
62
to 183 |
>999 |
| GMW98-4B
|
0.0
to 0.2 |
2
to 123 |
25
to 150 |
| GMW98-5B
|
0.0
to 0.2 |
0
to 6 |
233
to 320 |
| GMW98-6B
|
0.0 |
2
to 141 |
119
to 178 |
| GMW98-7B
|
0.0 |
9
to 19 |
474
to 750 |
| GMW98-8 |
0.0 |
0
to 34 |
54
to 152 |
The methane, carbon dioxide and hydrogen sulfide concentration results
throughout the monitoring program have fallen within the typical
composition ranges expected for landfills undergoing anaerobic decomposition
(i.e. no oxygen present).
The oxygen concentration results
have consistently been at 0.0% by volume, with the exception of
the last round of sampling (August 28th, 2000) where concentrations
up to 0.3% by volume were encountered. It is unclear at this point
if the recent increase in oxygen concentrations is due to leaks
in the clay liner or as a result of sampling error. Additional
sampling will be required to confirm any trends.
The carbon monoxide concentration
results at all of the wells indicate the presence of a landfill
fire, with the highest concentrations occurring near the suspected
location of the fire (between GMW98-2 and GMW98-3). When compared
to the carbon monoxide levels measured in March and April 1998,
there was a substantial increase in CO concentrations. The most
probable reasons for this are a combination of the following.
- The clay cover is preventing
the gases from escaping, and the CO gases are traveling outward
from the area of the fire through dispersive processes.
- The CO concentrations at the
fire are increasing as the oxygen is being used up and incomplete
combustion occurs more frequently.
This is another positive indication
that the clay cover is working properly.
          
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recommendations for implementation of phases
2 and 3
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