1. Department of the Environment Chemical Metals Industries, Inc. (CMI) Vapor Intrusion Issues at the First Removal Action Site Site #2 Site #1

2. Agenda Background Environmental Issues –Soil and Groundwater Contamination –Vapor Intrusion Current Activities –MDE Actions Site #2 (2103 Annapolis Road) 2000 Block of Annapolis Road Homes) –EPA Actions at Site #1 (2001 Annapolis Road)

3. Background 1981 - First Removal Action in US 1997 to Present – Post Removal Investigations –Soil Investigations / Removal –Groundwater Investigations –Vapor Intrusion investigations

4. Site #2 – 2103 Annapolis Road Assessment Activities –Monitoring wells installed to determine extent of subsurface contamination.

5. Remediation Activities Site #2 - 2103 Annapolis Road Injections of Chemical OxidationSoil Vapor Extraction System

6. Remediation Activities (Contd)

7. Indoor Air Sampling

8. Vapor Intrusion Issues 200920112013 2015 2017 20192021 2023 20252027 2029 203120332035 2037 2039 2041 2043 20452047 Owner Occupied Owner Occupied Owner Occupied CMI Site #1 Plume CMI Site #2 Plume 34 PCE 3.7 TCE 0.089J VC Soil Gas: 350,000 PCE 20,000 TCE 800 VC 19 PCE 1.7 TCE 31/30 PCE Soil Gas: 410 PCE 71 TCE Soil Gas: 1000 PCE 540 TCE Soil Gas: 4800 PCE 4900 TCE 1.4 PCE 0.38 TCE 3.0 PCE 1.6 TCE 2.1 PCE 3.6 TCE 2.2 PCE 0.55TCE 9.0 PCE 10.0 TCE 0.068 VC 3.1 PCE 2.8 TCE CMI Site #1 3.4 PCE 0.38 TCE 0.11 VC 21 PCE 1.8 TCE 16 PCE CMI Site #2

9. Design Challenges for Vapor Intrusion Mitigation Systems 1920s Row Houses –Stacked Stone Foundation –Dirt Floors And/Or Broken Concrete Floors –Adequate Electrical Supply Site #2 Site #1

10. Summary Site #1 –MDE To Provide Assistance As Needed By EPA Site #2 –MDE To Monitor Effectiveness Of Remedy –Inspect Operation Of Vapor Mitigation Systems

11. For Further Information: http://www.mde.state.md.us/Programs/LandPrograms/ERRP_Brownfields/ERRP_Superfund/index.asp Controlled Hazardous Substance (CHS) Enforcement Division Land Restoration Program Land Management Administration Maryland Department of the Environment 1800 Washington Boulevard, Suite 625 Baltimore MD 21230 (410) 537-3437