SLIDE 1
Cleanup Criteria Rules
Proposed Rules for the Volatilization to the Indoor Air Pathway (VIAP)
Matthew Williams, Vapor Intrusion Specialist Remediation and Redevelopment Division
1
2017
A new Paradigm!
2 www.flickr.com
*MPCA, 2016
Cleanup Criteria Rules 2017 Proposed Rules for the Volatilization - - PowerPoint PPT Presentation
Cleanup Criteria Rules 2017 Proposed Rules for the Volatilization - - PowerPoint PPT Presentation
Cleanup Criteria Rules 2017 Proposed Rules for the Volatilization to the Indoor Air Pathway (VIAP) Matthew Williams, Vapor Intrusion Specialist Remediation and Redevelopment Division 1 A new Paradigm! www.flickr.com *MPCA, 2016 2 2017
SLIDE 2
SLIDE 3
2017 Public Information Meetings
“Comprehensive Package”
DATE TIME LOCATION October 11, 2017 6:00 pm - 8:00 pm Holiday Inn Ann Arbor 3600 Plymouth Road Ann Arbor, MI 48105 October 18, 2017 10:00 am - 12:00 pm Grand Traverse Resort 100 Grand Traverse Village BLVD Acme, MI 49610 October 26, 2017 10:00 am - 12:00 pm L.V. Eberhard Center Grand Valley State University 301 West Fulton Street Grand Rapids, MI 49504-6495
3
- 2017 PUBLIC COMMENT PERIOD
To be announced
- 2017 PUBLIC HEARING
To be announced
SLIDE 4
Proposed Rule 27
- Volatilization to the indoor air pathway (VIAP)
– Shallow groundwater
- Situations where groundwater may be close or in
contact with a building
- Direct volatilization to the indoor air is likely to occur
– Groundwater
- Situations where groundwater is deeper than a typically
constructed building
- Vapor Intrusion (VI) is likely to occur
– Vapor – Soil
4
SLIDE 5
Tiered Approach For the VIAP
VI Tier 3B
Site-Specific
VI Tier 1
Generic Screening Levels
VI Tier 2
Unrestricted Residential Criteria
VI Tier 3A
Generic Criteria
Available Data Conceptual Site Model
(CSM)
- Common in modern
risk-based guidance
- Intended to promote:
– Efficiency – Better characterization
- Other key features:
– Self implemented
- Through VI Tier 3A
– Flexible
5
SLIDE 6
VI Tiered Process
6
VI Tier 1 VI Tier 2 VI Tier 3A
Facility-specific inputs to establish Unrestricted Generic Residential Criteria Facility-specific inputs to establish Restricted Generic Criteria Screening Value
*University of Wisconsin
*images from vastree.com
SLIDE 7
Facility-specific vs Site-specific
7
Facility-specific
VI Tier 2 and 3A Department pre-approved values Align to site conditions Implement
Site-specific
VI Tier 3B Proposed values to the Department Implement Approach that better reflect site conditions Department Approval
SLIDE 8
Tiered Approach For the VIAP
- VI Tier 2 establishes a
facility
- RBCA Tier 1 is NOT
the same as VI Tier 1
– RBCA Tier 1 is the VI Tier 2
- VI Tier 3A aids in
identifying land/use restrictions
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SLIDE 9
www.michigan.gov/deqrrd
Remediation and Redevelopment Division
- Leaders in environmental stewardship
- Partners in economic development
- Providers of excellent customer service
SLIDE 10
Tier 1 Screening Levels
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SLIDE 11
Depth to Groundwater
Single Parameter Sensitivity Analysis
11
Hazardous Substance
Benzene Tetrachloroethylene Trichloroethylene
CAS #
71432 127184 79016
Depth to GW
µg/L µg/L µg/L
<3m
1 1.5 0.073
Just >3.0m
14 96 6.1
5m
18 130 7.8
10m
27 200 12
Deeper the groundwater is, the more a hazardous substance is likely to diffuse before a structure
SLIDE 12
Soil Type
Single Parameter Sensitivity Analysis
12
Hazardous Substance
Benzene Tetrachloroethylene Trichloroethylene
CAS #
71432 127184 79016
UNITS
µg/kg µg/kg µg/kg
Sand
1.7 6.2 0.33
Loamy Sand
11 41 2.3
Sandy Loam
33 120 7.0
Loam
120 450 27 Larger particles (e.g., sand) means more pore space and easier migration of soil vapors