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Groundwater Monitoring

The Embankment Fill Monitoring Program (EFMP) was established by the Port of Seattle for compliance with the requirements of several permits issued for the port’s construction of a Third Runway at Seattle-Tacoma International Airport. These include the State of Washington’s Section 401 Water Quality Certification (401 WQC) issued by the Washington Department of Ecology (Ecology) and the U.S. Army Corps of Engineers Section 404 Permit. More specifically, the port is implementing the EFMP in fulfillment of Condition E-3 of the 401 WQC. 

Under the EFMP, the port has monitored groundwater and seeps along the toe of the Third Runway embankment during embankment construction, and will continue to monitor for 8 years following completion of construction. Construction of the Third Runway embankment was completed in 2007 and EFMP monitoring shifted from construction to post-construction monitoring effective January 1, 2008. EFMP monitoring is performed to detect potential water quality impacts from the Third Runway embankment at the Airport.

2012 Quarterly Reports

January Groundwater January Seeps
April Seeps​


Annual Reports

2013 Ground Water​ 2013 Seeps
2012​ Groundwater 2012 Seeps​
2011 Groundwater 2011 Seeps

2010 Groundwater


2010 Seeps​


2009 Groundwater 2009 Seeps​