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WATER GREMLIN PUBLIC HEALTH ASSESSMENT: PUBLIC COMM-ENT DRAFT <br />Were TCE air concentrations greater over shorter time periods? <br />The map underestimates TCE air concentrations for shorter periods of time (e.g., monthly, daily). <br />Because the TCE a.ir estimates are annual ay.e.rages, it is expected that there were times <br />throughout the year when concentrations at a particular location were higher or lower than the <br />annual..average. For example., dailyvariations are.expected: due:largely to variability in T.CE use <br />and weather conditions like wind speed. and direction. For periods:of time, TCE air <br />concentrations above the HBV extended beyond the outlined area shown in the maps. <br />Minnesota Department of Health i Site Assessment and Consultation Unit <br />Phone:.651-201-4897 1 Email- health.hanrd@state.mn.us <br />www.health;state,mn.us To Obtain this information in a:different <br />format, call: 651-201-4897 <br />01/07/2020 <br />59 <br />