vapor study informational meeting general mills/henkel corp. superfund site van cleve recreation...
TRANSCRIPT
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Vapor Study Informational Meeting
General Mills/Henkel Corp. Superfund SiteVan Cleve Recreation Center
November 12, 2013
Minnesota Department of HealthMinnesota Pollution Control Agency
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What we will cover The issue Health information The solution Your involvement
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Our MissionsMDH To protect, maintain and improve the
health of all Minnesotans
MPCA Working to protect and improve our
environment and enhance human health.
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MPCA vs. MDH Roles
Outside: MPCA or EPA Inside: MDH
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Site Information Located at 2010 East Hennepin Ave. in Minneapolis Former General Mills research facility
Used and disposed of chemicals on the site from 1947-1962 1981: discovered contamination 1985: site remediation began Groundwater extraction and treatment continued until
2010 MPCA continues to monitor groundwater and vapor data
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What we knowMain contaminant of concern: trichloroethylene (TCE) from on-site disposal (1947-62)
Current contamination status: Groundwater: Contamination is above drinking water
standards but poses no risk to drinking water supplies.
Vapors: Potential risk to residents in part of area above groundwater plume. More data needed.
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What are Volatile Organic Compounds (VOCs)? Chemical solvents used for cleaning and degreasing Common in consumer products and frequently found at
waste sites Easily evaporate from products, or soil and water if spilled
or disposed The major VOC of concern at the General Mills site is
trichloroethylene (TCE)
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Why is Vapor Intrusion a Possible Public Health Concern? Studies show people spend about 85 - 90% of their time
indoors (even children). There has been a growing interest in indoor air quality. The science of indoor air assessment has grown
tremendously in recent years. Radon gas awareness:
Effective January 1, 2014, the Minnesota Radon Awareness Act requires additional disclosure and education be provided to potential home buyers during residential real estate transactions in Minnesota. Before signing a purchase agreement to sell or transfer residential real property, the seller shall disclose in writing to the buyer any knowledge the seller has of radon concentrations in the dwelling.
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Inhalation Exposure Uncertainties
Difficult to estimate how much is absorbed
Behavior driven Large differences between
individuals Thus, exposures vary
between people
MDH health based criteria protect vulnerable people
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Inhalation health based value for Trichloroethylene: 2 mg/m3 in air U.S. EPA and MDH recently completed a TCE
toxicological review An increased risk of heart defects in newborns and immune
effects were found in recent studies We now calculate short term values based on exposures
that occur in utero, infancy, or early childhood, to ensure values protect everyone’s health
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U.S. EPA TCE Review
Non-cancer effects are driving the risk
12
72 studies
3 critical studies and
2 supporting
studies20 studies
Immunosuppression, autoimmune disease, hypersensitivity; decrease in thymus weight; heart defects in the developing fetus
Neurologic, kidney, liver, immune, reproductive, and developmental effects
kidney effects
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Groundwater → Soil Vapor → Sub-slab Vapor → Indoor Air
Exposure Pathway
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Sub-Slab Vapor Sampling
Critical first step to understand potential for vapor intrusion into indoor air
Simple, quick and easy to do Results will be generated quickly Can be used for decision-making
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What if TCE Vapor is Found? Screening values are very protective – even if exceeded
the risk is still very low. Mitigation systems are effective and easy to install. Mitigation also prevents infiltration of naturally occurring
radon gas, which is second leading cause of lung cancer in the U.S.
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What’s next? Sign an access agreement Sampling begins the week of November 18
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QuestionsMinnesota Department of Health Rita Messing, Ph.D.: [email protected] Emily Hansen, M.S.: [email protected] Site Assessment and Consultation Unit: (651) 201-4897 www.health.state.mn.us/divs/eh/hazardous/index.html
Minnesota Pollution Control Agency Hans Neve
[email protected], (651) 757-2608 Fred Campbell [email protected], (651) 757-2260 www.pca.state.mn.us
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Thank You
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Indoor Air Sampling (not needed) Typically use stainless steel (Summa) canisters that
are under a vacuum Long-term (up to 24 hour) sample time Do’s and don’ts: no smoking, don’t use fireplace or
candles, do keep windows closed Home chemicals need to be removed prior to testing
to minimize interferences: e.g. TCE in cleaners
Need very low detection limits
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