Table 23
Control Techniques for Landfill Gas (LFG)
Method
Comments
PASSIVE SYSTEMS
Gravel-filled trenches or low-permeability
Trenches and barrier
barriers installed between the landfill
effective they air a
and the area to be protected (see Figure
landfill or extend t
20).
groundwater surface.
Synthetic membrane barriers installed
Membranes control ve
beneath or within the building floor,
migration into struc
slab (see Figure 21).
System most effectiv
submembrane ventilat
(e.g., a gravel laye
vent pipes). Suffici
must be provided to
pressure buildup und
Raised floor foundation with natural
The number and size
ventilation of the subfloor area.
openings should be c
(e.g., provide a saf
A combination of the above.
ACTIVE SYSTEMS
Vacuum extraction (see Figures 22,
Systems draw LFG fro
23, and 24).
landfill or surround
a central location v
compressor where the
flared or otherwise
control odors. LFG
the subsurface envir
a well system or a g
trench.
Forced air injection (see Figures 22,
Systems are effectiv
23, and 24).
lateral LFG migratio
injected into the so
landfill via either
gravel-filled trench
"curtain" or barrier
migration. Forced a
also be used to flus
subfloor and subslab
of structures locate
landfill sites.
5.10-88
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