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Quantify Source S urce Reducti n Achieved For each major waste stream where one or more source reduction procedures have been implemented, estimate the amount of waste that will not be generated annually due to the implementation 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 single approach to estimating source reduction achieved that would be appropriate for all facilities. Following are examples that one might consider using to estimate source reduction achieved for each major waste stream: I. Side subtraction. Subtract the hazardous waste generated in 2002 from that gener- ated in 1998. 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 factors,such as changes in business activity. If hazardous waste generation.increased from 1998 to 2002 due to increased business activity, simple subtraction would not be the most accurate way to report source reduction achieved. f 2. NonTializ th n s btract. Normalize your hazardous waste generation for 1998 and 2002 using the most appropriate normalization .method for your business operations (e.g.,pounds of waste per 1000 units).Then subtract the normalized 2002 data from the normalized 1998 data. For example, a metal finisher may consider normalizing their 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 appro- priate calculations and assumptions to report the value in terms of pounds per year. 3. Quantify after imnlementina source reduction. Quantify hazardous waste generation before implementing a source reduction measure to establish an annual baseline num- ber. Then quantify a year's worth of hazardous waste generation data after implement- drag source reduction and subtract this number from the annual baseline number. 4. Quantify based on normalized data. Use normalization to determine source reduction quantity after implementing a source reduction measure,then use production data to estimate an annual amount. For example,a generator determines that they produced 5 less pounds of a hazardous waste stream for every I000 widgets produced. They can estimate pounds per year source reduction based on the number of widgets produced in a year. 5. Use percentage decrease: Use the same units of measure to quantify hazardous waste generation 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 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. L-5O `,