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Regional Solid Waste System
Greenacres Landfill is located in Liberty Lake, WA 99019. The landfill is closed and undergoing clean-up action. The last Ecology Five-Year Review occurred in 2013.
Ownership of Greenacres Township Municipal Dump given to Spokane County.
Ecology detected groundwater contamination in well adjacent to landfill site.
Landfill site nominated for Superfund eligibility.
EPA placed landfill site on National Priorities List (NPL).
Remedial Investigation of site.
Feasibility Study completed.
Enforcement Order given to monitor groundwater at site for three years.
Consent Decree signed by Spokane County to implement a clean-up action.
Landfill cover construction completed.
Post closure monitoring commences.
Final Clean-Up Action Plan commences.
Ongoing monitoring and maintenance continues.
Indicator Substances for Groundwater Monitoring
Type of Indicator
PCE, TCE, 1, 2-DCA, VC
As, Mn, Sb, Cr, Pb
Clean-Up Action Components
Landfill Cover System
30-millimeter PCV geomembrane layer with active gas extraction system and storm water control.
Gas Extraction System
Landfill gas directed through biofilter system before discharge.
Restrictions placed on access to groundwater and land use at site.
Groundwater Compliance Monitoring
Includes a network of 15 groundwater monitoring wells.
Locations, Hours & Fees
How to Dispose Properly
Dos & Don't of Recyclables
Types & Locations
Questions & Answers
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