During the past year, we have continued to make substantial scientific progress on our understanding of cavitation phenomena in aqueous media and applications of cavitation to remediation processes. Our efforts have focused on three separate areas: sonoluminescence as a probe of conditions created during cavitational collapse in aqueous media, the use of cavitation for remediation of contaminated water, and an addition of the use of ultrasound in the synthesis of novel heterogeneous catalysts for hydrodehalogenation of halocarbons under mild conditions. In order to gain further understanding of the conditions present during cavitation, we have continued our studies of sonoluminescence. We have made recent breakthroughs in the use of emission spectroscopy for temperature and pressure measurement of cavitation events, which we expect to publish shortly. We have been able to measure for the first time the temperature of cavitation in water during multibubble cavitation in the presence of aromatic hydrocarbons. The emission from excited states of C(2) in water gives temperatures that are consistent with adiabatic compressional heating, with maximum temperatures of 4300 K.