EXECUTIVE SUMMARY This report contains the results of a study to determine the range of compositions for a number of compounds in typical refinery process streams. Data representing 31 refineries, over 20 processes, and over 50 process streams was contributed by the project participants: Amoco, Arco, BP, Chevron, Exxon, Mobil, Shell and Texaco. The results of this project will be of use in estimating the emissions of specific compounds, in preparing permit applications and in other environmental control activities. Neither the Petroleum Environmental Research Forum (PERF) or the project participants make any claims as to the suitability or acceptability of the stream composition data reported herein for specific reporting or regulatory purposes. The material contained in this report will be of use in estimating the emissions of specific compounds, in preparing permit applications and in other environmental control activities. Neither PERF or the project participants make any claims as to the suitability or acceptability of the stream composition data reported herein for specific report ing or regulatory purposes.