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Assessing Vapor Intrusion The Revised Astm Standard


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Assessing Vapor Intrusion The Revised Astm Standard

  1. 1. Assessing Vapor Intrusion – the Revised ASTM Standard Cynthia J. Bishop Gardere Wynne Sewell, LLP Dallas, Texas
  2. 2. Why Assess Vapor Intrusion? <ul><li>Part of Due Diligence in Property Purchase </li></ul><ul><li>May be Required for Insurance Coverage </li></ul><ul><li>Minimize Future Claims by Tenants & Employees </li></ul>
  3. 3. The Due Diligence Standard <ul><li>Why do due diligence? </li></ul><ul><ul><li>Innocent Purchaser Protection </li></ul></ul><ul><ul><li>Bona Fide Purchaser Protection </li></ul></ul><ul><ul><li>Adjacent Landowner Protection </li></ul></ul><ul><ul><li>Required by Lenders </li></ul></ul><ul><li>Due Diligence Must Include “All Appropriate Inquiries” </li></ul><ul><li>(40 CFR chapter 312 ) </li></ul><ul><li>ASTM E 1527-05 Satisfies AAI </li></ul>
  4. 4. The Due Diligence Standard <ul><li>ASTM E 1527-05 </li></ul><ul><ul><li>Phase I Environmental Site Assessment </li></ul></ul><ul><ul><li>Identifies the presence or likely presence of a hazardous substances or petroleum </li></ul></ul><ul><ul><li>No samples collected </li></ul></ul><ul><ul><li>“ Recognized Environmental Condition” (REC) </li></ul></ul><ul><ul><li>EPA approved to satisfy AAI (40 CFR 312.11) </li></ul></ul>
  5. 5. ASTM Vapor Intrusion Standard <ul><li>ASTM E2600-08 (original version approved March 1, 2008) </li></ul><ul><ul><li>“ Standard Practice” for assessing vapor intrusion in structures </li></ul></ul><ul><ul><li>4-Tiered analysis that included a risk determination and mitigation discussion </li></ul></ul><ul><ul><li>“ Supplement” to a Phase I </li></ul></ul><ul><ul><li>Presumption of vapor intrusion condition if insufficient information exists about upgradient contamination </li></ul></ul>
  6. 6. ASTM E2600-08 Problems <ul><ul><li>Is this required in order to meet AAI? </li></ul></ul><ul><ul><ul><li>E2600-08 not approved by EPA </li></ul></ul></ul><ul><ul><li>“ Good commercial and customary practice” </li></ul></ul><ul><ul><li>Complicated and confusing procedure </li></ul></ul><ul><ul><li>Presumption of problem </li></ul></ul><ul><ul><li>Assesses risk of vapor within buildings </li></ul></ul>
  7. 7. Revised ASTM Standard <ul><li>ASTM E2600-10 (new version approved June 1, 2010) </li></ul><ul><ul><li>A “guide” rather than “good commercial and customary practice” </li></ul></ul><ul><ul><li>A tool to assist in determining a REC for vapors during a Phase I </li></ul></ul><ul><ul><ul><li>Not a supplement to a Phase I </li></ul></ul></ul><ul><ul><li>Vapor “ Encroachment Screening” rather than “Assessment of Vapor Intrusion ” </li></ul></ul><ul><ul><ul><li>Outside versus Inside </li></ul></ul></ul><ul><ul><li>No presumption if insufficient data </li></ul></ul>
  8. 8. Revised ASTM Standard - continued <ul><ul><li>2-Tiered analysis rather than 4 Tiers </li></ul></ul><ul><ul><ul><li>Tier 1 – known or suspected contaminated properties on or near the target property? </li></ul></ul></ul><ul><ul><ul><ul><li>Simplified Tier 1 procedure </li></ul></ul></ul></ul><ul><ul><ul><li>Tier 2 – if yes on Tier 1, does the degree of contamination create a vapor encroachment issue? i.e., Is there a REC? </li></ul></ul></ul><ul><ul><ul><ul><li>May include sampling </li></ul></ul></ul></ul><ul><ul><ul><li>Risk and mitigation “tiers” moved to appendix </li></ul></ul></ul>
  9. 9. Benefits of Revised ASTM <ul><li>Clarifies AAI Process </li></ul><ul><li>Eliminates Risk Assessment Element </li></ul><ul><li>Conforms to Historical Vapor Assessment Practices </li></ul><ul><li>Reduces Confusion and Cost of Vapor Screening </li></ul>