Operations: Evaluation of photographic data to predict base-surge fects from surface detonations. Ff- Photography from other projects waBb used. Shots: All. Radiation Exposure Potential: Slight (data for the project were frpm other units). Staffing: Two civilians from NOL, attached to this project, received total exposures of 0.120 R and 3.165 R. The individual receiving 3.165 R also participated in Projects l.la, 1.1b, and 1.1d, and prdb- ably did not receive significant exposure as part of this project. Project Report: Reference 42. Project 1.2a ~- Ground Level Pressures from Surface Bursts Agency: Sandia Corporation (SC) Operations: Instrumentation was installed on various islands of bdth atolls for this project and Projects 1.3 and 1.7. Measurements fo# this project were obtained on blast pressure versus time at ground levels with Wiancko gauges. Shots: All. Radiation Exposure Potential: Placement of instruments in areas TT taminated by prior shots and recovery of data would have posed a p tential moderate exposure. Staffing: Two civilians from SC were associated with this project they had total readings of 1.315 R and 1.195 R, but also participafed in Project 1.3. Project Report: Reference 43. Project 1.2b -- Ground Surface Air Pressure versus Distance from High-Yield Detonations Agencies: Ballistic Research Laboratories (BRL) 930lst Test Support Unit, Aberdeen Proving Ground 172