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Motorola 52 nd Street Superfund Site – Update

Motorola 52 nd Street Superfund Site – Update. U.S. Environmental Protection Agency Region IX April 2014. Outline. EPA staff update: Martin Zeleznik has retired Rachel Loftin (OU1, OU2) & Community Involvement (Amanda) not here tonight Introduction to the project (brief)

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Motorola 52 nd Street Superfund Site – Update

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  1. Motorola 52nd Street Superfund Site – Update U.S. Environmental Protection AgencyRegion IX April 2014 U.S. Environmental Protection Agency

  2. Outline • EPA staff update: • Martin Zeleznik has retired • Rachel Loftin (OU1, OU2) & Community Involvement (Amanda) not here tonight • Introduction to the project (brief) • Update on EPA investigation activities during February • TAGA Truck U.S. Environmental Protection Agency

  3. Motorola 52nd Street Superfund Site – Overview U.S. Environmental Protection AgencyRegion IX April 2014 U.S. Environmental Protection Agency

  4. Groundwater Contamination U.S. Environmental Protection Agency

  5. Responsible Parties Electronics & aeronautical manufacturing: • Motorola – former manufacturing facility at 52nd Street & McDowell • now Freescale • Honeywell – existing facility at 34th Street and Air Lane at northern boundary of airport • Number of smaller facilities • Joray/Kachina U.S. Environmental Protection Agency

  6. Contamination • Solvents used to clean electronic components (circuit boards, etc.) and aircraft parts (“Degreasing”) • Spills, leaks & disposal to ground lead to contamination of soil & groundwater underneath facilities • Groundwater contamination has moved off-site U.S. Environmental Protection Agency

  7. Primary Contaminant - TCE Trichloroethylene (TCE) • Chlorinated solvent used in electronics production and aerospace industry • Formerly present in many commercial products (“Liquid Paper”) & still in a few (e.g., gun-cleaner, WD-40) • Contaminant of Concern at Motorola 52nd Street Superfund site (and at many other Superfund sites) U.S. Environmental Protection Agency

  8. Groundwater TCE Plume U.S. Environmental Protection Agency

  9. Treatment plants OU2 (corner 20th & Washington) pump and treat plant OU1 (on 52nd St. facility) pump and treat plant Both treatment plants send the treated water to beneficial use, such as manufacturing processes or irrigation

  10. Reductions in TCE plume September 2008

  11. Motorola 52nd Street Superfund Site – Vapor Intrusion Investigation Using EPA’s TAGA Truck(Trace Atmospheric Gas Analyzer) U.S. Environmental Protection AgencyRegion IX April 2014 U.S. Environmental Protection Agency

  12. Vapors from soil and/or groundwater contamination can migrate upwards into buildings • Potential indoor air exposures • Chlorinated solvents (TCE) Vapor Intrusion (VI) U.S. Environmental Protection Agency

  13. Multiple Lines of Evidence Vapor Intrusion? • Outdoor air • Indoor air • Sub-slab • Soil gas • Groundwater Indoor Air 5’ Soil Vapor 15’ GW Contam Gradient U.S. Environmental Protection Agency

  14. The TAGA Truck U.S. Environmental Protection Agency

  15. OU1 Subsurface bedrock ridge – promote TCE concentration and vapor intrusion? U.S. Environmental Protection Agency

  16. OU1 Vapor Intrusion Study McDowellNorthside McDowellSouthside Lindon Park Schools U.S. Environmental Protection Agency

  17. TAGA at OU1 - 2014 • 2 Goals: • Confirmation indoor air sampling in a few homes • sub-slab mitigation systems working correctly? • Additional soil gas sampling near some homes with previously elevated indoor air TCE concentrations • Sampling occurred in Lindon Park & both McDowell areas (Northside and Southside) U.S. Environmental Protection Agency

  18. Summary of Findings & Actions from TAGA 2014 TAGA Findings • Indoor air sampled – 6 residences: • Where detected, TCE within protective risk range • Upgraded sub-slab depressurization (SSD) systems are functioning very well • Soil Gas Probes – 5 locations • TAGA data confirms previous data • No evidence of another localized source U.S. Environmental Protection Agency

  19. OU2 – Vapor Intrusion Subsurface bedrock ridge – promote TCE concentration and vapor intrusion? U.S. Environmental Protection Agency

  20. 2 more step-outs OU2 Schools & Homes School Phased Approach • Installed soil gas probes one week prior to TAGA Truck arrival • Saved time and put TAGA truck capabilities immediately to use • Limited probes (blue circles) initially; added step-outs as needed • Established EPA Action Levels prior to going out into field • If soil gas data indicated potential Hazard Index greater than 3, sampled indoor air immediately • EPA with TAGA Truck was able to get soil gas data, obtain access agreement from resident, and tested indoor air in home within a single day (3 homes) School GW well with high TCE concentrations. U.S. Environmental Protection Agency

  21. OU2 Results & Lessons Learned • TCE concentrations in some of the initial soil gas samples above screening level: • all soil gas locations drilled & sampled (step-outs) • TCE concentrations in 3 of 33 soil gas samples above screening level for Hazard Index= 3 • Prompted indoor air testing in 3 homes • Indoor air was non-detect or trace (indoor source?) • Using the TAGA Truck allowed more rapid assessment of soil gas and, where needed, indoor air – allowed decisions in the field U.S. Environmental Protection Agency

  22. OU3 U.S. Environmental Protection Agency

  23. M52 OU3: Overview • The OU3 Working Group (APS and Honeywell) are working on a RI/FS which likely lead to a final ROD • Soil Gas monitoring in three locations is required as part of the RI investigative work • Soil Gas concentrations at one soils gas well was elevated relative to the other two wells prompting two questions: • Is there a vapor intrusion risk at the surface? • Are the soil gas concentrations at SVMW-1 from groundwater or an unknown source? U.S. Environmental Protection Agency

  24. M52 OU3: Locations of Soil Gas Wells SVM-3 SVM-2 SVM-1

  25. OU3: TAGA Soil Gas Data Title Heading: • bullet • bullet U.S. Environmental Protection Agency

  26. OU3 Results and Next Steps • No vapor intrusion risk was found in the area around the SVM-1 • EPA is investigating possible causes of the elevated soil gas concentrations in the vicinity of SVM-1 • Results from the investigation will be used to determine future actions • The area around SVM-1 is the only OU3 soil gas issue discovered. Most work in OU3 is focused on the state of VOCs in groundwater (i.e. RI/FS)

  27. TAGA Truck Field Work Photo Sequence of EPA Doing Field Work

  28. Drilling Soil Gas Probes in Right-of-Way

  29. Installing Soil Gas Probes (15 feet below ground surface)

  30. Retrieving Soil Gas Probe

  31. Collection & Analysis of Soil Gas

  32. If soil gas results showed potential indoor air TCE greater than HI=3, use “sniffer” in TAGA Truck and enter building

  33. TAGA Machine measures real time data

  34. Questions or Comments?

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