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ANSWER: If no data indicate that the solvents go anywhere other than to the air, then <br />output category 5, emitted to air, is the best assumption. <br />However, if the company is aware that measurable quantities of the mold release are <br />cleaned off the molds and shipped away as waste, or that measurable quantities become <br />part of the product, then these output categories would also be appropriate. <br />52. QUESTION: Acetylene, a characteristic ignitable substance, is used to operate an atomic <br />absorption machine which is used to analyze process waters and wastewaters. The <br />acetylene is burned as an open flame in the machine. How do I report the output? <br />ANSWER: The acetylene is chemically altered (output category 1) during operation in <br />that it chemically changes to something that is no longer an ignitable material. <br />53. QUESTION: Isopropyl alcohol (IPA) is used in a facility as a cleaning solution. It is <br />listed as a reportable substance. Typically the application is by use of a spray bottle, <br />followed by wiping with a rag or paper towel. How should I report the output? <br />ANSWER: Emitted to air (output category 5) may be the best assumption in this case, <br />unless the company's best engineering judgment is that all or some percentage of the IPA <br />remains on the rags or paper towels when they are disposed of, in which case transferred <br />away as waste (output category 3) would be used. <br />-70- <br />