2022 05-17 CC PACKET - Laserfiche WebLink

Home

WATER GREMLIN PUBLIC .HEALTH A.55E5SMENT; PUBLIC COMMENT DRAFT Lead. in Drinking Water Community concerns were raised about the possibility of lead contamination in drinking water from Water Gremlin. Low levels of lead (u.p to 15 ppb) have been found in shallow groundwater ben eath.the Water Gremlin building, but this does not reach the. deeper aquifers used for drinking water. The highest concentration found is below: the federal action.leveI of 15 ppb. Lead has: not been detected in deeper water samples, including the samples to from:the buried:sarid aquifer, which is the aquifer used by most of the private wells in the area (Wenck, 2020). Lead is: not usually found in well water, although it may enter drinking water as it travels from the well through plumbing systems.. For .example, private weIIs. buiIt before 1995 may have submersible pumps that contain leaded -brass components. Lead can also enter drinking water as it passes through the house's plumbing and fixtures, particularly in homes built before 1986 when lead solder was still in use. Brass components. such as faucets, coolers, and valves may contain.small amounts of lead. Private well owners are responsible.for regularly testing their well's water if it is used -for cooking and drinking to make. sure it is safe. MDH recommends testing. a. home's water for lead at least once. For moreinformation about private well testing, please see.(WaterQua lity/WelI Testing/Well Disinfection (www. hea lth,stat.e. m n: us/communities/environment/water/we I Is/ovate rqua lity/index. htrri 1 ). All public watersystems follow standards set bythe .U.S. EPA for lead testing. This information about lead testing.ca.n be found in. the yearly Consumer Confidence Re.. port. In June 2019, the City of White Bear Lake began providing public service announcements about lead in.dr'inking water after 4.of 30. residences that were tested were found to exceed the .federaI action level for lead in drinking water. Theseresults are not related to the Water Gremlin site, General tips to avoid lead in drinking water are to let. the. water run.30-60 seconds before..using it for drinking and cooking, use cold water, and test your water for lead. for more. info, visit. Lead in Well Water.Svstems www.health.state.mn.us communities enviironment water wells vate rq ualit lead.html . VI. Worker and Worker Family Exposures A. Indoor Air — Workplace Chemical Use and Vapor Intrusion Workplaces in Minnesota that use chemicals are regulated by the Minnesota Occupational Safety and Health Administration (MN OSHA) under the Minnesota Department of Labor and Industry (DOLI). Workers protected under MN OSHA must be provided.right-to-know training on hazardous products and chemicals and methods to help control hazards in their workplace. MN OSHA. has regulatory air values that workplaces cannot exceed, which are called Permissible Exposure Limits (PE Ls). The MN..OSHA PELs for 8-hour exposures of TCE and t-DCE are. 270,000 µg/rn3 and 790,000 µg/m3, respectively: MDH believes that :these occupational values may not be adequately -,protective of worker health,. because they are outdated, are not intended to protect .the. most.sensitive workers and do not incorporate the most recent toxicological data. t-DCE con centrations.1n the facility's indoor.air are generally high and fluctuate significantly because of its current use in. prod uction. As described above (Section B. 2019-2020 Air Emiss ions —trans-1,2= dichloroethylene) toxicity data fort-DCE is 11mited; however, MDH has provided Risk Assessment Advice for ambient air based on the amount. of t-DCE.(approximately 50,000 µg/m3) .where an irnmune system W