1 / 12

Source Control Coordination Lower Duwamish Case Study

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)

jamuna
Download Presentation

Source Control Coordination Lower Duwamish Case Study

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Source Control CoordinationLower Duwamish Case Study Bruce Tiffany, King County Beth Schmoyer, City of Seattle Kris Flint, US EPA/Region 10 October 30, 2009

  2. 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)

  3. 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

  4. 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)

  5. 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)

  6. 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

  7. 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

  8. 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”

  9. 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

  10. 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

More Related