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Here is a link on tar sand crude issues that mentions the thinning compound, and says it contains large amounts of benzene.  Generally, from what I have found on the web, there is considerable environmental objection to the use of this thinning compound because it is more toxic than the crude, and in the case of a spill, it sinks deeply into the ground along with the crude oil.  Also, the thinning compound alone is shipped to the tar sands origin by rail, and because of its ability to quickly percolate into the ground a long distance, there is worry about derailments spilling the thinning compound.  <o:p></o:p> <a href="http://www.onearth.org/article/tar-sands-oil-plagues-a-michigan-community">http://www.onearth.org/article/tar-sands-oil-plagues-a-michigan-community</a>
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