Region 10 of the U.S. Environmental Protection Agency has an online album of images of Portland Harbor's Superfund site, from where I got the images in this post (except the two Google Maps images).
In this post I've inserted some images to provide a clear idea of the location of the site. The EPA's site has additional images of petroleum sheen on the water and core strata showing petroleum tar deposits. Pretty nasty stuff.
The image above is a view of the tar body along the beach, looking generally North.
The three map images below are a USGS map of the Superfund site -- the former GASCO petroleum processing facility -- compared to ca. 2006 images from Google Maps:
The two images below are aerial photos taken in the 1950s some time of the GASCO facility in operation:
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