Smokestacks from a Canadian smelter deposited high levels of lead and arsenic into the Upper Columbia River valley, new soil testing has confirmed. To protect children from lead exposure, the U.S. Environmental Protection Agency will begin cleaning up rural properties near Northport, Washington, where young children and pregnant women live, said Laura Buelow, an EPA project manager. The goal is to get the properties cleaned up quickly, though it’s still unclear how many will need soil removal, she said.