Perform Research of Groundwater Drainage and Flooding Issues at Covington Complex Through the Installation of Four Groundwater Monitoring WellsCX(s) Applied: B3.6Date: 10/18/2010Location(s): King County, WashingtonOffice(s): Bonneville Power Administra...
Office of NEPA Policy and Compliance
October 18, 2010
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CX(s) Applied: B3.6
Date: 10/18/2010
Location(s): King County, Washington
Office(s): Bonneville Power Administration
Bonneville Power Administration (BPA) is encountering seasonal groundwater seepage problems at the Covington Substation that cause flooding in both the control house and the untanking tower. In order to investigate the root cause of this problem, BPA proposes to perform a drainage evaluation consisting of video inspection of the drain lines and groundwater level monitoring through the installation of 4 monitoring wells. Two wells will be installed around the control house and two near the untanking tower, each dug to a depth of 20 feet. Wells will be used to evaluate the hydrogeologic conditions through the installation of automatic pressure transducers and additional automatic water level recording instruments. All work will be conducted on BPA property and within the fenced complex.