Mountain Landfill Case History
Shake and Shingle Case History
Smoke was observed at the Vancouver
Landfill on Wednesday, October
18th, 2000. It was quickly established that an 8m (24ft) thick
layer of construction demolition waste was on fire in
an 80 by 700m cell. Within hours Porschner Construction,
the landfill earthmoving contractor mobilized three off-road
Mac dump trucks to deliver water to the site. Each
truck delivered a fire fighting payload of 20,000 litres (5,000
U.S. gallons). The trucks were operated around the clock.
With smoke and steam continuing
to emanate from several vents on the landfill surface, the fire
investigation team from LandfillFire
Control Inc. was
contacted on Friday morning. Within the hour an emergency assessment
team was on the way to the fire site. A bar hole punch grid was
quickly established to monitor temperature and landfill gas composition
including carbon monoxide, oxygen, methane and hydrogen sulphide.
All steam and smoke vents on the landfill surface were also flagged
and surveyed to establish exact locations. As elevated CO levels
and high O2 levels were detected, a water line capable of delivering
up to 1,000 gpm was established to the fire site and a high capacity
fire monitor was mobilized.
To cut off the
oxygen supply to the fire, additional clay intermediate cover
was placed on the side slopes of the burning cell over the weekend.
Water application continued around the clock. Within a week the
monitoring results conclusively demonstrated that carbon monoxide,
temperature and oxygen levels were dropping. The fire was declared
extinguished on Friday, October 27th. Total extinguishments costs
were approximately $80,000 Cdn.
A forensic review
established that the fire was triggered by spontaneous combustion
of the demolition, land clearing and construction (DLC) materials.
Gaps in the intermediate cover soil allowed entry of oxygen into
the waste, promoting high temperature aerobic decomposition, exothermic
pyrolysis, and eventually a full scale fire.
by the City of Vancouver, Porschner Construction and the LandfillFire
Control Inc. team resulted in quick control of the fire and full
extinguishment in less than two weeks.
Copyright 2008 LandfillFire
delivering 5,000 gallons of water.
mounted monitor delivers 200 gpm.
LandfillFire Control Inc.
technician installing gas probe.