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! LOF Glass S Woodward-Clyde Consultants <br /> May 6, 1985 <br /> Page 2 <br /> were detected in water samples. The approximate locations of the leak, <br /> the trenches and the process water well are shown in Figure 1. The oil <br /> itself is not expected to be a major threat to groundwater as it is a <br /> relatively heavy process oil and does not contain a large percentage of <br /> the more toxic and soluble components as would be true with a lighter <br /> fuel oil or gasoline. <br /> Remedial actions to date have included repair of the leak, excavation of <br /> the contaminated soil in the immediate vicinity of the leak, and the <br /> installation of a recovery system in the bottom of the excavation. The <br /> system consists of a slotted 55-gallon drum with a suction hose placed at <br /> the bottom. Suction was provided by a intermittantly operated <br /> submersible electric pump which has been replaced with a constantly <br /> operating air driven double diaphragm pump. The drum is positioned at <br /> the bottom of the sump which has been excavated to a depth of <br /> approximately 1 foot below the water table. The system removes both <br /> water and oil as it flows into the sump thereby creating a small cone of <br /> depression in the local water table which, in turn, increases the flow of <br /> oil into the sump. The water and oil is pumped to a tank where it is <br /> allowed to separate and the water periodically drained off the bottom and <br /> into the existing waste water treatment facility. This system has <br /> recovered approximately 3,250 gallons of oil to date, but has recently <br /> been shut down due to the water table receding below the bottom of the <br /> sump. An additional 1000 gallons of oil is estimated to have been <br /> contained in the soil that was excavated from around the leak site. <br /> Investigative Activities <br /> on March 4, 1985 Woodward-Clyde Consultants submitted a proposal to LOF <br /> Glass to investigate the spill incident and determine the appropriate <br /> remedial actions. On March 11, 1985 Woodward-Clyde began the <br /> investigation by conducting a geophysical survey of the site using a <br /> Geonics EM-31 terrain conductivity meter to attempt to elineate�he <br /> extent of subsurface contamination. The presence of metal objects, both <br />