Landfill Case History
Delta Shake and Shingle Case History
landfill Case History
Throughout the 1990's, the Campbell
Mountain Landfill was plagued by reoccurring subsurface landfill
fires in the area referred to as the North Ravine. Previous attempts
to extinguish the fire consisted of excavating the material and
flooding it with water. Although the cost per attempt was minimal,
the success was limited.
In 1998, Sperling Hansen Associates
were retained to supervise efforts to permanently extinguish the
fire, and to prevent ant reoccurrence through other means. Through
co-operative efforts with representatives from the regulatory
body, the local government and the Fire Commissioner's office,
a progressive three phase fire suppression plan was developed.
The first Phase of the suppression
plan, which consisted of installing an impervious clay cap over
the landfill crest in conjunction with shotcrete seals along the
bedrock interface edges, was constructed in the summer of 1998.
All staff involved in the construction program were required to
follow the protocols laid out in a detailed Health and Safety
Plan created specifically for this project.
To access the effectiveness of
the cover system, a series of eight boreholes were installed in
and around the north ravine. Thermistor strings, which consist
of a series of temperature sensors connected at approximately
5 metre intervals to a cable, were installed in each of the boreholes
to measure the subsurface temperature gradients. Screened wells
were also installed in each borehole so that gas concentration
measurements, in particular carbon monoxide concentrations, could
Monthly temperatures and quarterly
gas composition measurements continue to be taken as part of an
ongoing environmental monitoring program. The results to date
indicate that the clay barrier and shotcrete seal have successfully
cut off the oxygen supply to the fire zone, and that in turn the
fire is subsiding. In particular, the temperature results directly
around the original fire have followed a downward trend since
the installation of the cover. As a result, Phases 2 and 3 of
the fire suppression program have been put on indefinite hold.
Copyright 2008 LandfillFire
Installation of the Monitoring Wells.
fractured bedrock using shotcrete.