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rise over time and would be directed to the next Settling Tank by a piping connection near the top of the tank. Water would be drawn off the bottom of the cone-shaped tanks until samples indicate increasing lubricant content. This process of progressive separation would remove approximately 80 percent of the entrained water droplets. The contaminated water would be transferred to a Wastewater Holding Tank of sufficient capacity to allow long-term settling operations. In a batching operation, the oily water would be skimmed off by a centrifugal water pump drawing from near the top of the holding tank and transferred to the Used Lubricant Storage Tanks for reprocessing. The remaining quantity of relatively uncontaminated water would be pumped to the Reten- tion Pond or the rotary dryer inlet for evaporation. The remaining entrained water, in very small droplet form, would be removed (to specification limits) by a forced-circulation flash evapora- tion process. Used lubricants would be transferred from the final Settling Tank into a vertical shell and tube heat exchanger (Feedstock Heater) to achieve the final evaporation temperature. The heat exchange vessel would always be maintained full and under pressure to avoid these changes. The lubricant would then be forced through a spray nozzle into the evaporator column and against an impingement plate. Recovered lubri- cant would drain into the lower half of the column where a constant liquid level would be maintained. Analysis for water content of the lubricants exiting the column would determine the appropriate amount ofl recirculation required. Recovered lubricant, referred to as finished oil , would then be stored in one of three Finished Oil Storage Tanks. Steam used for heating of the lubricant at various steps is gener- ated in a residential -size package boiler (Steam Generator) . Blending oil for firing on-site equipment would be contained within a single Blending Tank with hard-piped fill connections from the finished Oil Storage Tanks and from a diesel Fuel Oil Tank. The Fuel Oil Tank would be exempt from the San Joaquin Air Pollution Control District 2-17 101-46.R4 4/7/89