Geologic and Wireline Borehole Summary from the Second ILAW Borehole (299-E24-21)

The second borehole for the Immobilized Low-Activity Waste Disposal site Performance Assessment (PA) was drilled in March 2001. Continuous core samples were obtained for characterization activities in support of the PA. The borehole was drilled to a depth of 335 feet below ground surface and completed as a groundwater monitoring well. Only sediments of the Hanford formation were penetrated further defining the paleochannel that trends northwest southeast through the 200 East Area. Open-framework gravel was encountered from 335 feet drilled depth to 270 feet. From 270 feet to the surface, sands dominate the stratigraphy with minor amounts of gravel. The stratigraphic section can be divided into three layers defined by paleosols at the top. The water table is at 312.45 feet below ground surface. Aquifer testing indicates that a lower bounding value for hydraulic conductivity of the gravels comprising the paleochannel is 75 m/day.

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