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WATER GREMLIN PUBLIC HEALTH ASSESSMENT: PUBLIC COMMENT DRAFT in air typically does not settle on the soil or surface water, and any that. does would evaporate back.!nto the air quickly: TCE in air would not affect garden.produce. Although TCE does not stay in the air at a location very long or build up over time, .the Water Gremlin facility regularly (typically Monday to Friday) emitted it into the air. Estimated Tons of TCE Emitted The MPCA estimated the total amount of TCE emitted to the air per year from 2002-2019 based.on records from. Water.Grem Ito (see Figure 1..below). The MPCA estimated these.annua1.totals... by calculating the difference between the amount.of liquid TCE purchased and the amount of TCE removed from the facility as waste for the year. Figure 1: Estimated tons of TCE emitted 2002-2018 Estimated tons of TCE emitted 200.2-20I 12❑ 100 so 71 71 65 62 60 4 I 37 ao 33 29 20 '02 `03 '04 '05 '06 '07 '08 '09 '16 `11 '12 120 Y The chart below.(Figure 2). provides the tons of TCE emitted as reported by Water Gremlin to the U.S.. EPA'sToxic Release Inventory (TRI) for the years 1992-2001..Water Gremlin's 1999 permit application, as discussed above, provides different values for the years.1994.(119 tons vs 100 tons 'in the TRI),1996 (87 tons vs loo tons in the TR1), and .1999 (53 tons vs 57 tons in the TRI). While the accuracy of these TRI data is uncertain, these%.annual emission estimates appear to be the best information available for estimating. TCE air emissions in the surrounding area forthis. earlier period of TCE use. 8..