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Hazardous Waste and Process Description Oil from machining operations is usually in the form of a soluble oil that is mixed with water and acts as a coolant for parts and tools in machining processes. In addition, non- soluble oils, usually called "tramp oils,' are generated from lubrication of mechanical parts in the machine, e.g., gears and sliding worktables. Hazardous Waste Management Approaches Major source reduction measures recently implemented for coolants and tramp oils at SLAC have included the acquisition of new numerically controlled machines, which internally recycle and filter the cutting fluid. Other source reduction measures that have been implemented in the past include: • Selection of long -life coolants • Coolant makeup control • Machine cleaning and scrap metal removal • Machine repair to improve performance • Eliminating machine leaks • Eliminating duplicate machines • Selecting alternative cutting technologies such as electric discharge machining and high-power water jet machining It is expected that the above mentioned source reduction measures, particularly the acquisition of new machines, will help reduce machining coolant waste in the future for comparable production level. SOURCE REDUCTION/POLLUTION PREVENTION EVALUATION September 1, 2011 SB 14 Plan 44 September 1, 2011 SB14 Plan 45 6.3 Spent Machine Coolant (Cutting Fluid) from Machining Operations Site 2010 quantity (lb)SLAC Rejected alternatives and rationale: 5,701 Replacing equipment before the end of its useful life is usually not an economically feasible measure for reducing this waste stream. Raw Materials: Cutting fluid, water, Machining Spent Coolants Off Site machine oils Operations from Machining Operations disposal Metals being machined — typically steel, stainless (CWC 223) steel, copper and aluminum parts Machined Parts FIGURE 111.6.3. WASTE MACHINE COOLANT OIL GENERATION FLOW DIAGRAM Hazardous Waste and Process Description Oil from machining operations is usually in the form of a soluble oil that is mixed with water and acts as a coolant for parts and tools in machining processes. In addition, non- soluble oils, usually called "tramp oils,' are generated from lubrication of mechanical parts in the machine, e.g., gears and sliding worktables. Hazardous Waste Management Approaches Major source reduction measures recently implemented for coolants and tramp oils at SLAC have included the acquisition of new numerically controlled machines, which internally recycle and filter the cutting fluid. Other source reduction measures that have been implemented in the past include: • Selection of long -life coolants • Coolant makeup control • Machine cleaning and scrap metal removal • Machine repair to improve performance • Eliminating machine leaks • Eliminating duplicate machines • Selecting alternative cutting technologies such as electric discharge machining and high-power water jet machining It is expected that the above mentioned source reduction measures, particularly the acquisition of new machines, will help reduce machining coolant waste in the future for comparable production level. SOURCE REDUCTION/POLLUTION PREVENTION EVALUATION September 1, 2011 SB 14 Plan 44 September 1, 2011 SB14 Plan 45