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amounts of clay AMPERES appended bibliography broken rock Bureau of Public CHAIRMAN DAVIS0N clay inclusions clay stratum clean sand constant depth traverse CRATER LAKE deposit of sandy depth of overburden DISTANCE drill earth resistivity test ELECTR0DE SPACING-FEET FIGURE electrode spacing empirical method existing working face feet per second figure 16 Figure 20 geophysical methods Gish-Rooney curve granular materials graph high resistivity zone highway departments J. L. SHIELY locating adequate supplies M0ORE method of analysis methods of test oscillograph Public Roads R0CK rapid surveys relatively resistivity contour map RESISTIVITY CURVE resistivity data Resistivity depth curves RESISTIVITY DEPTH TEST resistivity map resistivity survey resistivity traverse right-hand portion road construction rock surface sand and gravel sandy gravel seismic data seismic tests Shallow Subsurface Explorations shown in figure Solid rock usually Station 7+30 STRUBLE surveys for sand test pit traverse data obtained trend Typical seismic Records WASHINGTON COUNTY water table WEST 0F EXISTING