The purpose of this report is to provide information to operators of gasoline bulk plants and to air pollution control authorities regarding sources of emissions of hydrocarbon vapors from bulk plants and the effectiveness and costs of available technology for control of these emissions. The study was limited to bulk plants distributing less than 76,000 liters (20,000 gallons) of gasoline daily. Pacific Environmental Services, Inc., under an EPA contract, conducted an independent evaluation of the impact of hydrocarbon emission controls on bulk plants. PES developed a data base from a survey of bulk plants in three Air Quality Control Regions. Data base was used to define a typical bulk plant operation and estimate the uncontrolled hydrocarbon emissions. Results indicated that the typical bulk plant is small (15,000 liters or 4,000 gallons per day) and that breathing and fugitive emissions are significant factors in additiion to transfer emissions which EPA regulations control. PES surveyed available hydrocarbon emission control techniques, investigating the most promising techniques for cost, efficiency, development status and bulk plant applicability.