District Rule Development staff conducted a study of Safety Kleen degreasers in 1996. These enclosed degreasing units are distributed throughout the County and used by many facilities. Safety Kleen owns the equipment and provides a regular solvent disposal and recharge service to the user. The actual solvent usage for each device at each site is often unrecorded or over reported as the full capacity of the degreasing unit. Generally, these solvents are low-volatile hydrocarbon mixtures with trace quantities of benzene, toluene, and xylenes. Emissions are typically a very small percentage of the overall solvent throughput.