Vapor Intrusion Guidance Comments & Database USEPA’s (OSWER) 11/03 Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils Presentations of Comments by: Henry Schuver, US EPA Michael Sowinski, DPRA Robert Truesdale, RTI For: 2003 RCRA National Meeting, Wash.DC - Aug. 12, 2003
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Vapor Intrusion Guidance Comments & Database USEPA’s (OSWER) 11/03 Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater.
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Vapor Intrusion Guidance Comments & Database
USEPA’s (OSWER) 11/03 Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
Presentations of Comments by:
Henry Schuver, US EPA Michael Sowinski, DPRA Robert Truesdale, RTI
For: 2003 RCRA National Meeting, Wash.DC - Aug. 12, 2003
Background on Henry Schuver
MS Geology, ASU 17 yrs. Experience: State of NJ, Consultant,
EPA Region 2, EPA-HQ OSW since 1997 EI Guidance (2/99) Human & Groundwater Vapor Summit (1/00), Issue kick-off mtg. EIForum2000 Mtg (8/00) w/ 2-days of Vapor experts RCRA EI Vapor Intrusion Guidance (10/01) EIVapor2002 Mtg (1/02) w/ 3-days of Vapor experts Participant OSWER Vapor Intrusion Guidance(11/02) Identified as lead to OSWER Response to Comments
Epidemiology- DrPH candidate
This presentation is about the Comments Received
It is NOT presenting Responses to Comments
Quick Review of VI Guidance, H. Schuver, 10 min
Overview of Comments, Michael Sowinski, 20 min
Comments on Comments, Henry Schuver 20 min
Vapor Intrusion Database, Robert Truesdale, 20 min
Panel for Q&A and Comments, 20 min
Status of OSWER’s draft-Subsurface Vapor Intrusion Guidance
Signed Nov. 22, 2002 (for use) By OSWER Assist. Admin. (AA) Marianne Horinko
Published in Federal Register Nov. 29, 2002 90-day Comment Period (Nov. 29 - Feb. 27)
Guidance, Comments, & Training available at: http://www.epa.gov/correctiveaction/eis/vapor.htm http://www.epa.gov/edocket RCRA-2002-033 http://www.clu-in.org/conf/tio/vapor_021203/ www.iavi.rti.org (should have these slides + audio)
Response to Comments on-going (latest is here)
VI Guidance Workgroup [& contributors]
OSWER’s draft-Vapor Intrusion Guidance
Paul Johnson, ASU Todd McAlary, GeoSyn Ian Hers, UBC/Golder
Andrew Fan, R3 David Bennett, OERR Dave Mickunas, ERTDebbie Newberry, OSWER Diane Groth, NJDEP Dom. Digiulio, ORDCraig Dukes, SC Edgar Ethington, CO Frank Kover, ORDHelen Dawson, R8 Henry Schuver, CAPB Jeff Crum, MIJohn Boyer, NJDEP Jim Weaver, ATH Matt Hale, OSWMatt Straus, OSWER Paul Locke, MADEP Ray Cody, R1Richard Mattick, OUST Ronald Mosley, RTP Sheila Gaston, CO
Stiven Foster, ORD Tom Aalto, R8
Robbie Ettinger, Shell Leslie Hay-Wilson, SageR David Folkes, Env-GrpBlayne Hartman, HP Labs Marcia Bailey, R10 Pat Vanleeuwen, R5A. Guiseppi-Elie, Dupont Elsie Patton, CTDEP Vic Kremsec, BPTom McHugh, API Bill Wertz, NYDEC Craig Mann, EQM
Subsurface contributions only Single pathway (single chemical) – not cumulative at all
For screening in (or out) For further consideration (or not) (I.e., potential) Whole facilities/sites (Not for delineating extent) Use changes = reevaluation
Not regulation Only guidance – based on current understanding Not requirements or obligations
- Shallow sources (< 5ft below bldg foundation) - Crawlspace homes (w/o liners*) - Very permeable geology - Significant preferential pathways - Sources in unsaturated zone (above the water table fringe?)- Mobile gas plumes (Landfill gas, ‘vapor clouds’) - Very low air exchange rates or v. high (neg.) pressure
differentials
If there:
Proceed to Tier 3 (Q6 Site-Specific Pathway)
Calculation of Soil Gas and Groundwater Target Screening Levels
Select indoor air target screening level.
AF = 0.1
AF = 0.001
AF = 0.01
Shallow soil gas screening level (SGSLshallow ) is 10 times indoor air target screening level.
SVSLshallow = IASL * 10
Deep soil gas screening level (SGSLdeep ) is 100 times indoor air target level.
SVSLdeep = IASL * 100
Groundwater screening level (GWSL) is the aqueous concentration corresponding to a soil gas concentration 1000 times greater than the indoor air target level.
Modeling (site-specific) Only to identify ‘most-likely-to-be-impacted’ buildings
Combining complex factors, e.g., soil, depth, & building factors If no problem predicted there – (by approp. site-specific model)
Interim (EI) determinations don’t need samples to confirm that
Direct measurement (confirmation, even if no problem expected) Building-specific foundation and/or indoor air from Subset of potentially affected buildings Before a final decision for vapor intrusion If using indoor air – need more than one + “background”
Next: Overview of Comments By: Michael Sowinski of DPRA MS-Environ. Eng. (UM), J.D. (Vermont) 12 yrs. Environmental Consulting Manages DPRA San Diego Office
For OSW Manager of Comment Review Manager Indoor Air Vapor Intrusion db