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Quantify Source Reduction Achieved For each major waste stream where one or more source reduction procedures have been imple- mented,estimate the amount of waste that will not be generated annually due to the implemen- tation of source reduction. The generator must determine the most appropriate method for estimating source reduction achieved,which is to be quantified in pounds per year. The method of determining this value may depend on the type of waste stream, operational factors, business activity,economic factors,and other business-or operation specific influences. There is no sin- gle approach for estimating source reduction achieved that would be appropriate for all facilities. Methods that one might consider using to estimate source reduction achieved for each major waste stream include: 1. Simple Subtraction. Subtract the hazardous waste generated in 2010 from that generated in 2006. This simple subtraction would be best applied to waste streams whose change in quantity was mostly due to the source reduction measures implemented,and not because of other fac- tors,such as changes in business activity. However, if hazardous waste generation increased from 2006 to 2010 due to increased business activity,simple subtraction would not be the most accu- rate way to report source reduction achieved. 2. Normalize Then Subtract. Normalize your hazardous waste generation for 2006 and 2010 using the most appropriate normalization method for your business operations (e.g., pounds of waste per 1000 units). Then subtract the normalized 2010 data from the normalized 2006 data. For example,a metal finisher may consider normalizing generation of waste plating bath solution based on pounds of spent bath per 100-square-feet of surface area plated. After determining the difference, make the appropriate calculations and assumptions to report the value in terms of pounds per year. 3. Quantify After Implementing Source Reduction. Quantify hazardous waste generation before implementing a source reduction measure to establish a baseline number. Then quantify a year's worth of hazardous waste generation data after implementing source reduction and sub- tract this number from the annual baseline number. G� U 4. Quantify Based On Normalized Data. Use normalization to determine source reduction C quantity after implementing a source reduction measure,then use per data to estimate Ei an annual amount. For example,a generator determines that they produced 5 less pounds of a i, O hazardous waste stream for every 1000 widgets produced. They can estimate pounds per year O 006 source reduction based on the number of widgets produced in a year. C.. 5. Use Percentage Decrease. Use the same units of measure to quantify hazardous waste gener- ation before and after implementing a source reduction procedure. Then calculate a percentage that represents the decrease in hazardous waste generation. A pounds per year source reduction L. amount can be estimated using the percent decrease and an annual hazardous waste total that represents hazardous waste generation prior to implementing the source reduction procedure. cZ s V 52