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Source Control Coordination Lower Duwamish Case Study. Bruce Tiffany, King County Beth Schmoyer, City of Seattle Kris Flint, US EPA/Region 10 October 30, 2009. General Source Control Process – Lower Duwamish Style. Under 2004 LDW Source Control Strategy Source Control Work Group (SCWG)

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source control coordination lower duwamish case study

Source Control CoordinationLower Duwamish Case Study

Bruce Tiffany, King County

Beth Schmoyer, City of Seattle

Kris Flint, US EPA/Region 10

October 30, 2009

general source control process lower duwamish style
General Source Control Process – Lower Duwamish Style
  • Under 2004 LDW Source Control Strategy
    • Source Control Work Group (SCWG)
    • 4 Priority Tiers
    • Process = identify, characterize, control
    • Documentation & reporting (Ecology:EPA)
case pcb discovery at the old rainier brewery
Case: PCB Discovery at the Old Rainier Brewery
  • Discovery in the Diagonal/Duwamish CSO/SD source area (Tier 1)
    • Seattle source tracing (stormwater)
    • King County Industrial Waste Program (pre-treatment)
    • Information to the SCWG
  • More data needed for Ecology or EPA to proceed with action under statutes
filling data gap
Filling Data Gap
  • EPA conducted inspection under TSCA (Toxic Substances Control Act)
    • Copied to King Co, Seattle, Ecology, departments of health (State & County)
    • PCB concentrations sufficient to require further investigation under TSCA for
      • unauthorized use (historic paint still on building)
      • bulk waste (paint flaking off of buildings)
next for epa
Next … for EPA?
  • EPA working with developer under TSCA
  • Conduct remedial investigation of structures for PCBs still present
    • Cleanup plans in development
      • Near term to manage exposures from track out
      • Long term to remediate old paint source
  • Coordinating with King County & Seattle re levels of concern for LDW sediments and source control (which are not equal to TSCA)
next for seattle king co
Next … for Seattle & King Co?
  • King County:
  • 2008 – Three rounds of aqueous sampling.
  • 2009 – Sediment samples collected. Results pending.
  • Seattle:
  • 2004/2005 – Elevated PCBs in right of way
  • 2008 – Sampling & Cleaning
  • 2009 – Re-sampled.
  • Future actions will be influenced by sediment results
slide9

Former Rainier Brewery

Site drains to Seattle stormwater sub-basin in the Diagonal/Duwamish CSO/SD source area and the King County Hanford No. 2 CSO sub-basin in the East Waterway source area

2004/2005

PCBs 17.5 mg/kg (dry) at RC37, also found in CBs along city street the site

PCBs in on-site CBs ranged 177 to 2,226 mg/kg (dry)

2008

January: PCBs still elevated (8.4 to 189 mg/kg (dry)) in CB solids on north end of site.

Property owner jetted/cleaned system draining to Diagonal Ave S CSO/SD

RCB37 (downstream) still elevated (2.3 mg/kg (dry)) so SPU jetted & cleaned

2009

February: RCB37 downstream re-sampled with PCBs at 0.5 mg/kg (dry)

March: EPA inspects. PCBs up to 10,000 mg/kg (dry) in paint samples. CB sampled between Buildings 3 and 13 was 105 mg/kg PCB

study lessons
Study = Lessons
  • SCWG is good venue to
    • Raise common concerns about potential sources
    • Share data & ideas about sources, next steps
  • SCWG is used to inter-agency coordination, but cross-program coordination internally is sometimes more challenging
    • Need to see other program’s limits/potentials to coordinate effectively
    • Need to overcome “the way things are usually done”
does source control coordination ldw style work
Does Source Control Coordination LDW-style Work?
  • Yes!
  • Fewer surprises about what’s going on within any given sub-basin (we have 24 in 32 sq miles)
  • Many minds & hands make lighter work (though more conference calls, meetings and longer lists of cc’s on letters!)
  • We’ll keep coordinating because it does work
contact information
Contact Information
  • Bruce Tiffany
    • 206/263-3011
    • bruce.tiffany@kingcounty.gov
  • Beth Schmoyer
    • 206/386-1199
    • beth.schmoyer@seattle.gov
  • Kris Flint, USEPA/R10
    • 206/553-8155
    • Flint.Kris@epa.gov
  • LDW Source Control Web-Page
    • http://www.ecy.wa.gov/programs/tcp/sites/lower_duwamish/lower_duwamish_hp.html