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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Bruce Tiffany, King County
Beth Schmoyer, City of Seattle
Kris Flint, US EPA/Region 10
October 30, 2009
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
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)
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
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