Update on Revision of MoDNR s MRBCA Guidance

Transcription

1 Update on Revision of MoDNR s MRBCA Guidance Chris Cady, Ph.D Missouri Department of Natural Resources Brownfields/Voluntary Cleanup Program REGFORM MO Hazardous Waste Seminar November 15, 2017

2 Moving Parts Moving Parts Guidance Revision RBTL Update

3 input is Essential 20+ Members: MRBCA Users Consulting, Industry, REGFORM Present problems, ideas, proposed approaches and revisions Listen to comments, experiences, suggestions Use results to create revised draft for review

4 MRBCA Revision Status Guidance Revision Major Topics List Input Drafting Internal Review & Revision Public Finalize Tier 1 Risk-Based Target Level Tables Review Methods & Models Input Draft Tables (DHSS) Internal Review Public Finalize Rulemaking Review 2009 Rule [Guidance Review/Drafti ng] Draft Revised Rule Internal Review File Rulemaking

5 Guidance Revision Major Topics List Input Drafting Internal Review & Revision Public Finalize Group has reviewed MoDNR s major topics list Provided input Initial draft of most sections complete Under internal review and revision Next: SHG review/comment Vapor intrusion sub-group

6 VI Assessment - Not Linear Process VOC Spill/Release VOCs Detected in Soil/Groundwater Uh-oh, no soil target levels Screening VI DTLs Indoor Air>RBTL Soil Gas>RBTL Vertical/Horizontal Exclusion Distance Triggers Spill/Release Soil Gas Sampling Plume Stability Site Characterization Indoor Air Sampling Conceptual Site Model Interferences # Sampling Events? Tier 2 VISL? Tier 1 Risk Assessment Tier 3??? Occupied Building Preferential Pathways Free Product Wet Basement Interim/ Emergency Actions Source Removal/ Remediation Mitigation Systems Mitigation & Remediation Verification? Performance Monitoring O&M/Long Term Stewardship Future Buildings?

7 Vapor Intrusion Guidance Development The first draft of anything is meadow-muffins! - Ernest Hemingway Photo: LOC/Public Domain

8 Tier 1 Risk-Based Target Levels Review Methods & Models Input Draft Tables (DHSS) Internal Review Public Finalize Provider: DHSS Harmonizing methods and models with RSLs Expanded contaminant list Special Bits: total petroleum hydrocarbons, Pb, subsurface VOCs/excavation verification Draft tables produced DHSS writing Apx. E detailing models and methods

9 Rulemaking RBTLs/models/inputs incorporated by reference into 2009 Rule [10 CSR ] Rule allows guidance update, limited RBTL modification Guidance and RBTL changes necessitate rule changes Significance and scope of proposed changes exceed rule intent Rulemaking necessary

10 Rulemaking Review 2009 Rule [Guidance Review/Drafti ng] Draft Revised Rule Internal Review File Rulemaking Rulemaking of some kind required even if only to update RBTLs Guidance revisions rule revisions Programs other than BVCP? Rulemaking to update RBTLs is time consuming

11 Upcoming Events/Schedule review of draft guidance Expect early 2018 Public comment on draft guidance Rulemaking Begin when guidance essentially final

12 Getting Involved MRBCA Web Page Download documents Sign up for info about upcoming meetings and activities MoDNR welcomes and encourages your participation. Tim Chibnall Chris Cady, Ph.D HWP HWP-BVCP