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WATER GREMLIN PUB.LI.0 HEALTH ASSESSMENT: PUBLIC COMMENT DRAFT Water Gremlin t-OCE Air Emissions and Health The.outdoor a.ir surrounding the.Water Gremlin buildings and property is affected by use of t-DCE within the facility, Air concentrations measured at the five monitors on the Water Gremlin property are highly variable; based largely on weather and facility use. The t-DCE from Water Gremlin is expected. to. spread out in air surrounding.the facility similarly to the dispersion estimated for historical TCE eittiissions, although current use. of t-DCE is significantly lower than past. use.of TCE. In 2020, MDH developed:safe. inhalation values fort�DCE for two different exposure durations —chronic; for up to a lifetime of exposdre;.and subchronrc, :defined as repeated :exposure for greater than 30 days,. up to 10% of an..average lifetime ('"S years). The subchronic value was developed in response to community members' requests .for help understanding the potential risks .f..rom shorter duration exposu res. While recent exposure to t-DCE'from Water Grem [in is of a.subchronic.du.ration, the more .apppropriate and protective objective of controlling ongoing facility emissions; is to remain at or below the chton 1c.air guidance value of:20 µg/m'. This 1s particularly true in a.community where past emissions of TC£ were excessive. MDH does not expect health effects in the corn munity from Water Grem Iin's past or current emissions. of t-DCE. Given the available air monitoring:data on the Water Gremlin property, and what cars be estimated from modeling; there were times when a.ir concentratio ns.were .over the current chronic.RAA value (.20 µg/m3) beyond Water Grem lin's p roperty bou n da ry, and very limited times when air concentrations were over.the subchronic.KAA value (200 µe.m3) for a.short duration. However, neither the. chronic.nor subchronrc RAA were.exceeded for a length of time that. poses a potential health concern. The air monitoring results an the Water Grem[in property are also higher than actual exposures to. t-DCE (how much t=DCE enters the. body through breathing) experienced by people in the community. Are Some People at Greater Risk? MD.H generally considers women who are pregnant or may become pregnant, infants and. children, the elderly; and people living with chronic disease or a compromised immune system to be: more sensitive to exposure to chemicals. There is no information available regarding t-DCE exposure and effects to a developing human fetus .or smaIl:children. Based on the results of only one animal study, t-DCE is not currently expected to cause developmental effects. in people, but the information is too limited to draw this conclusion (U.S. EPA, 2010). MDH air guidance values are developed to. be protective of people who may be more susceptible. C. Lead and Particulate Air Emissions Water Gremlin manufactures.custom.lead batteryterrninaI posts, sinkers, a.nd ammunition components through a series. of operations including die casting, hot melt. molding, hot:melt extrusion, cold forming, coining, gravity casting, and coating (Wenck, 2019a). No primary lead production or smelting is done. Water Grem [in. melts lead bars.purehased from local recycling facilities: Pollution control equipment called electrostatic precipitators (brand name "Smog Hog) are used to remove airborne lean and particulate matter before air is exhausted buts ide the building. Emissions testing for lea d.and particulate matter was conducted 1n 1994:and total facility emissions Were .deterrh1ned to be 0.5 pound per year, an amount considered an. insignificant activity for permitting purposes. As a result, no regulatory controls for lead emissions were needed/:requ1red.. 99