Even though polychlorinated biphenyls (PCBs) have not been manufactured in the U.S. for over forty years, they continue to be present in building materials, including in caulk and joint materials, ...
This combination of images from April 28, 2014, and July 15, 2016, respectively, and provided by teacher Cynthia Yost, shows black residue from a failed fluorescent light ballast, left, and a carpet ...
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