Landfill gas is collected at the wells and risers and directed through a manifold to passive flares for combustion. Another piping system was installed under the cover to collect and direct leachate to one of the four leachate storage ponds on site. Spokane County is currently in the third year of a five-year Interim Action Monitoring Program. The program includes monitoring landfill gas, surface water, leachate, and groundwater. Landfill gas is monitored at various points on the gas collection system as well as 11 gas probes outside the boundaries of the cover.
Surface water is sampled annually at three sites.
Leachate is samples twice a year. The overall effectiveness of the cover will be reviewed at the end of the five-year monitoring program.