The Rio Blanco Oil Shale Project (Gulf Oil Corporation and Standard Oil Company of Indiana) is presenting its second summary progress report for Tract C-a to the U.S.G.S. Area Oil Shale Supervisor (AOSS). This report covers the work accomplished from the period of October 1, 1974 through February 28, 1975. As requested by the Area Oil Shale Supervisor, the data collected from the Geotechnical Data Gathering Project and the Environmental Baseline are on file in the AOSS office in Grand Junction, Colorado. These data comprise Progress Report #2. This summary report presents an overview and highlights of these data. As requested, it has been correlated to and is organized consistent with Progress Report #2.