Utilities Solid Waste
1026 West Broadway Ave
Public Works Bldg. 4th Floor
Spokane, WA 99260
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 LOCATION: Liberty Lake, WA 99019
CURRENT STATUS: Closed and under going Clean-up Action, last Ecology Five Year Review occurred in 2013.

Historic Timeline
1967 Ownership of Greenacres Township Municipal Dump given to Spokane County
1972 Landfill closed
1978 Ecology detected groundwater contamination in well adjacent to landfill site
1983 Landfill site nominated for Superfund eligibility
1984 EPA placed landfill site on National Priorities List (NPL)
1989 Remedial Investigation of site
1991 Feasibility Study completed
1994 Enforcement Order given to monitor groundwater at site for three years
1997 Consent Decree signed by Spokane County to implement a clean-up action
1998 Landfill cover construction completed
1999 Post closure monitoring commences
2001 Final Clean-up Action Plan commences
2015 Ongoing monitoring and maintenance continues


Indicator Substances for Groundwater Monitoring
VOC's PCE, TCE, 1,2-DCA, 1,2-DCE, VC
Metals As, Mn, Sb, Cr, Pb



Clean-up Action Components
Landfill Cover System 30-mil PVC geomembrane layer with active gas extraction system and storm water control
Gas Extraction System Landfill gas directed through biofilter system before discharge
Institutional Controls  Restrictions placed on access to groundwater and land use at site.
Groundwater Compliance Monitoring  Includes a network of 15 groundwater monitoring wells.