In bookmarking a few pages relating to the 5th and Hill toxic site, I came across this image of the plant when it was still up and running.
It's hosted over at http://temporarytraveloffice.net/mMigration/mMigration.html, a page with a number of details about the site. Since benzene, toluene, ethylbenzene and xylene were present during refining, the "site" is not really as bounded as the fence around the property suggests. Several houses nearby are undoubtedly positioned on top of toxic land (and water).
A quick Google search for "5th and hill" reveals another contested zone of the same address ... this one in Los Angeles. Somewhere there is a piece waiting to be written about this cargtographic coincidence and the socio-environmental impacts felt in both places.
5th and Hill in Los Angeles:
5th and Hill here in Champaign-Urbana: