USGS: PAHs and Coal-Tar-Based Pavement Sealcoat

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Here is an excerpt from the article: 

Coal-tar-based sealcoat products typically are 20 to 35 percent coal-tar pitch. Product analyses indicate that coal-tar-based sealcoat products contain about 50,000 mg/kg PAH - about 100 times more PAHs than in used motor oil and about 1,000 times more PAHs than sealcoat products with an asphalt base.

The rest of the article can be found at: 

http://tx.usgs.gov/sealcoat.html

Posted on January 13, 2014 .