[en] LLL, in order to support the formulation by CER of a Project Rio Blanco definition document, undertook technical studies in several pertinent areas. Those studies, dependent on rock properties at the Rio Blanco site, should be considered to be very preliminary in nature since the only rock samples available to LLL were obtained several miles from the projected location of the Rio Blanco Event. The technical studies included rock properties, prediction of close-in explosion effects, gas production, radioactivity production and gas quality, and explosive canister assembly characteristics