Page 366 - Materials Chemistry, Second Edition

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The Sanitary Landfill 337

36"-48"

Concrete Gravel LCR
base
Sand

Geomembrane FIGURE 10.25 A low-volume
Steel plate sump (U.S. EPA, 1989).

FIGURE 10.26 Photograph of a sump being installed (Reproduced with kind permission of Environmental
Research and Education Foundation, 2002).

10.4.28 GROUNDWATER MONITORING AND CORRECTIVE ACTION

The U.S. EPA landfill criteria establish requirements for groundwater monitoring and corrective
action for all landfills. The criteria include a systematic process that requires routine groundwater
monitoring (“detection monitoring”). In detection monitoring, a minimum number of indicator
parameters must be tested at least annually. Figure 10.27 depicts a typical groundwater monitoring
well. If statistically significant increases above background concentrations of any of the indicator
parameters are detected, a more comprehensive monitoring program must be instituted. If evaluated
concentrations of pollutant parameters continue or increase, the facility is then required to develop
and implement a corrective action program (U.S. EPA, 1994).