1. Petroleum Vapor Intrusion 2013 Springfield Environmental Summit Valerie Garrett Technical Environmental Specialist Hazardous Waste Program, Tanks Section

2. The Petroleum Vapor Intrusion Pathway Must be Evaluated at All Petroleum Storage Tank Release Sites Typically the Pathway that Drives the Cleanup

3. Source EPA

4. What Changes are in the Works? Federal Level  EPA is developing a PVI Guidance  ITRC is developing a broader PVI Guidance State Level  MDNR has compiled its own stakeholder group

5. In 2002, EPA Drafted a Vapor Intrusion Guidance Developed Mainly for Chlorinated Sites Primary Difference between CVI & PVI  Biodegradation Petroleum Specific VI Guidance needed

6. EPA Approach Developed & Analyzed Empirical Database Established Inclusion Distances  Vertical (6 ft for dissolved, 15 ft for LNAPL)  Lateral/Horizontal (projection/extrapolation) Selected Concentrations Indicating LNAPL  Groundwater 5 ppm Benzene & 30 ppm TPH  Soil 10 ppm Benzene & 250 ppm TPH

7. Source EPA

8. Status of EPA PVI Guidance 1 st Draft Released March 2012 – Limited Circulation for Review 2 nd Draft Released June 2012 – Limited Circulation for Review Final Draft for External Review - April 17,2013 –Comments Due by May 24, 2013 –ASTSWMO LUST Task Force is taking the lead on assembling comments

10. Interstate Technology & Regulatory Council (ITRC) Workgroup Developing Broader PVI Guidance to Include –Other types of sites (ASTs, Refineries, MGP, heating oil) –Investigations & Analyses –Modeling –Remediation/Mitigation

11. What is Missouri Doing? PVI Stakeholder Group, contemplating similar changes 2 of the Members are also on ITRC PVI Team

12. What Changes Might we see in Missouri? Target Levels will Consider Advection & Biodegradation Screening Criteria Based upon Concepts of Inclusion Zones/Exclusion Zones Delineation

13. Thanks