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Early Action Area-6 (EAA-6) is located along the eastern side of the LDW
Superfund Site between 3.7 and 3.9 miles from the southern tip of Harbor Island.
The map shows two properties next to EAA-6, the Boeing Isaacson site and the
Boeing Thompson site. In addition, stormwater from the central portion of
King County International Airport drains to EAA-6 through a 48-inch public storm
drain outfall.
EAA-6 is located near a former tidal marsh area which was reclaimed when the
Duwamish River was straightened and channelized to form the current Duwamish
Waterway in the late 1800s and early 1900s. After dredging, the area was
used as farmland.
In the 1920’s and 1930’s Bissel Lumber Company occupied the Boeing Thompson site
to the south of former Slip 5. Around 1941, the United States Navy used the
property just north of Boeing Isaacson and constructed steel melting, forging,
and fabricating facilities that were known as Isaacson Iron Works Plant No. 2.
The Isaacson Steel Company purchased the plant in the 1950s and expanded the
steel fabrication facility to what is now the Boeing Isaacson property during
the 1950s and 1960s.
From the 1930’s to the mid-1960’s portions of Slip 5 were filled. By about 1966,
Slip 5 was completely filled as part of site development at Boeing Thompson. The
Boeing Company purchased the Thompson property in 1957 and the Isaacson property
in 1984.
|
Surface Sediment |
Subsurface Sediment |
|||
|
> SQS* |
> CSL** |
> SQS |
> CSL |
|
|
* Sediment Quality Standard **Cleanup Screening Level |
||||
|
Metals |
||||
|
Arsenic |
l |
l |
l |
l |
|
Acenaphthene |
l |
|
l |
|
|
Benzo(a)anthracene |
l |
|
|
|
|
Benzo(a)pyrene |
l |
l |
|
|
|
Benzo(b)fluoranthene |
l |
|
|
|
|
Benzo(g,h,i)perylene |
l |
l |
l |
|
|
Benzo(k)fluoranthene |
l |
|
|
|
|
Benzofluoranthenes (total) |
l |
l |
|
|
|
Chrysene |
l |
|
l |
|
|
Dibenzo(a,h)anthracene |
l |
l |
|
|
|
Fluoranthene |
l |
|
l |
|
|
Fluorene |
l |
|
|
|
|
Indeno(1,2,3-cd)pyrene |
l |
l |
l |
|
|
Phenanthrene |
l |
|
l |
|
|
Total HPAH |
l |
|
|
|
|
Total LPAH |
l |
|
|
|
|
Phthalates |
||||
|
Bis(2-ethylhexyl)phthalate |
l |
l |
l |
l |
|
Butyl benzyl phthalate |
l |
|
|
|
|
Other
SVOCs |
||||
|
Benzoic acid |
l |
l |
|
|
|
Benzyl alcohol |
|
|
l |
l |
|
Dibenzofuran |
l |
|
l |
|
|
PCBs |
||||
|
PCBs (total) |
l |
|
l |
l |
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
