Abstract
A 3D Ground Penetrating Radar (GPR) survey at 50 MHz center frequency was conducted at Hill Air Force Base, Utah, to define the topography of a clay aquitard. Conventional processing augmented by multichannel domain filtering showed a strong reflection from a depth of 6.1–9.1 m despite attenuation by an artificial clay cap approximately .6 m thick. This reflection correlates closely with the top of the aquitard as seen in lithology logs at 3 wells crossed by common offset radar profiles from the 3D dataset. Lateral and vertical resolution along the boundary are approximately .6 m and .3 m, respectively. The boundary shows abrupt topographic variation of 1.5 m over horizontal distances of 6.1 m or less and is probably due to vigorous erosion by streams during lowstands of ancient Lake Bonneville. This irregular topography may provide depressions for accumulation of hydrocarbons and chlorinated organic pollutants. A ridge running the length of the survey area may channel movement of ground water and of hydr...
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