AREA A/B ENGINEERING REPORT - Waste Management

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selected and placed to form a protective “fluff layer” above the LCRS. This fluff layer also
serves to provide the perfect “seeding” conditions for a biofilter to develop in the bottom-most
waste. As previously described in Section 1.4.3, research has shown that this biofilter layer has
the capacity to provide very long-term treatment of leachate before it could emerge from the
landfill.
Figure 3-2: Some Typical Features of a Leachate Collection System
3.3.2 Key Environmentally Protective Features of Leachate Collection Systems
To enhance liner system performance, leachate is collected and removed through the
operation of a LCRS to prevent it accumulating above the liner. This minimizes
potential liquid head build-up on the liner, which provides an additional safeguard
for leachate containment within the landfill. Leachate management activities
typically consist of:
• Monitoring and managing liquid levels through operation of a LCRS and, in some cases,
modified with a leachate recirculation/liquids injection system;
• Leachate quality monitoring for recirculation or disposal purposes; and
• Monitoring and maintaining the overall performance of the leachate management
infrastructure.
Although progressively reduced levels of leachate generation occur after a landfill
closes, the LCRS is designed to rapidly convey the maximum quantity of leachate
expected to collection sumps for final management. The LCRS is also designed to
MD10186.doc 40 29 March 2009