By Brianna M. Lane Thanks to a spongy M&M-like technology, contaminated soil in the Detroit River downstream of the MacArthur Bridge has been contained. Powdered activated carbon was used to absorb the contaminated soil in the $3.6 million Detroit RiverWalk project that finished in December. “Activated carbon is a pure form [of carbon] that’s used to absorb contaminants,” said John Collins, the general manager for AquaBlok, the Ohio contamination remediation company that created the carbon under the brand name of AquaGate +PAC. The project was a partnership between the EPA and the Detro...