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Occurrence of ground water in the basalt__________ 2 Suggestions as to general specifications for test wells_ Tectonic deformation of the basalt________________ 3 Test operation of the wells ______________________ _ Tilting and warping_________________________ 3

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Two seismic cross sections were run with a refraction seismograph near Spokane,, Wash,., in Hay and June l?5l» One section trended northsouth across the Spokane River valley plain just east of the Idaho-Washington boundary! the other trended east-west across the strath just north of the Hillyard section of Spokane. Each section secured data that permitted the compilation of a graphic cross section showing the position of (1) the water table, (2) the base of the glacial and glaciofluviatile deposits, and (3) the generalized base of the Latah formation and associated deposits (which is the top of the consolidated bedrock). The data confirm the inference of Pardee and Bryan that the granitic bedrock lies at an altitude of about 1,000 feet beneath the valley plain near the State boundary. The base (a heretofore unlocated feature) of the glacial outwash deposits, the main aquifer of the area, was determined as an uneven plane at an altitude of 1,600 to 1,700 feet in the State* boundary district and at 1,700 feet in the Hillyard Trough district.