This is the first of two reports which describe the instrumentation and measurement techniques employed and present the data obtained during Phase I operations on the Talley Energy Systems, Inc., oil shale field project near Green River, Wyoming. Phase I operations included creation of four horizontal hydraulic fractures in the oil shale formation from a central wellbore drilled and cased through the formation and notched at each level, about seven feet apart. Asymmetry was relatively consistent, but direction of asymmetry was not as expected prior to hydrofrac operations. The methods of determining hydrofrac sizes correlated well with the degree of asymmetry, but surface resistivity measurements beyond the first fracture did not work well because the first fracture retained conductive fluid and masked the growth of the subsequent fractures. Raw, processed, and interpreted data and the Site Activities Summary Log are presented in appendices.