"Systems, Science and Software (S-Cubed) recorded ground motion, air pressure and detonation diagnostics during the blasting of Retorts 8X, 7 and 8. Retort 8X was blasted on January 24, 1981; Retort 7 on February 21, 1981; and Retort 8 on April 4, 1981. Gauges were located in drillholes and along the drifts near the retort and out to distances of 1100 feet. The goals were to determine if the blasting proceeded as planned and to gather basic data needed for safety and efficiency in the design of commercial retorts. Commercial use of the oil shale resource will require that retorts be developed as close to each other as safety and efficient processing permit. Predicting and controlling ground motion and air blast from blasting operations will be important aspects of the underground retorting process. The instrumentation used in this work and the measurement locations are discussed in Section 2. Particle velocity gauges were installed in drillholes located between 50 and 100 feet from the , accessible sides of the retorts. Other particle velocity gauges were installed in the drifts at greater distances. Air pressure gauges were mounted in the drifts leading to the three retort levels. Measurement results are presented and discussed in Section 3. Conclusions are given in Section 4. In general, the blasting appears to have occurred as planned. No significant anomalies were noted. Air pressure was low, probably because of the restricted entryways. Section 5 gives our recommendations for future instrumentation."