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SUBSURFACE LANDFILL FIRE
SUPPRESSION AND MONITORING
A Case Study at the Campbell
Mountain Landfill, Penticton, British Columbia
Gas
Concentration Measurements.
In order to determine if the clay seal was effectively cutting
off the oxygen supply to the landfill, and see if the carbon monoxide
concentrates were dropping, landfill gas composition measurements
were taken quarterly since the installation of the clay cap. A
Landtec GA-90 gas analyzer and the PhD Analyzer were used to take
the measurements. The GA-90 is specifically designed for landfill
gas applications and provides methane, carbon dioxide and oxygen
concentrations in percent by volume. The PhD Analyzer was used
to obtain the hydrogen sulfide and carbon monoxide concentrations
in ppm.
Assuming that the
only route through which atmospheric air could enter the refuse
was through the cover (i.e. the sides and base were impermeable)
the best indication of whether or not the oxygen was being effectively
cut off was to take gas concentrations in the upper probe. The
results of the measurements, and the depth from surface to the
top of the upper screen, are included in
table 4.
| Table
4 Gas Concentration
Measurements |
| Well |
Depth
to Screen (m) |
Methane
CH4 in % |
Carbon
Dioxide C02 in % |
| GMW98-1B |
15.2 |
48.0
to 75.2 |
37.5
to 49.9 |
| GMW98-2B
|
7.0 |
25.7
to 48.8 |
26.8
to 40.1 |
| GMW98-3B
|
5.2 |
34.0
to 63.1 |
31.1
to 41.0 |
| GMW98-4B
|
3.0 |
50.9
to 65.1 |
37.7
to 47.5 |
| GMW98-5B
|
6.1 |
58.0
to 65.7 |
42.0
to 48.6 |
| GMW98-6B
|
8.5 |
49.1
to 65.4 |
36.1
to 49.1 |
| GMW98-7B
|
8.25 |
35.0
to 54.5 |
30.7
to 43.3 |
| GMW98-8 |
7.0 |
40.0
to 70.7 |
33.5
to 49.8 |
          
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