The University of Minnesota has quickly, if quietly, begun to address threats posed by a toxic waste dump it discovered under student family housing in Southeast Minneapolis. The university found the toxins under three buildings on a four-city-block residential complex last year.

On Sept. 18, 2008, workers digging a trench at the Como Student Community Cooperative found ash and debris in the ground at its complex. Samples tested that day showed high levels of several toxins, including arsenic and lead. More tests revealed more hazards, so within days, on an emergency basis, the university hauled away 558 tons of contaminated dirt to a landfill in Rosemount.

The university last week finished the first phase of cleanup work, bringing the total amount of soil removed so far to 10,000 tons.

For generations, children have lived and played on the land along East Hennepin Avenue between 27th and 29th avenues SE. And for generations, it seems, the soil around the houses has held rich deposits of lead and arsenic - so much so that a handful of dirt ingested by a child, "if it was from a hot spot, could potentially cause brain damage," according to Lynne Grigor, project coordinator at the Minnesota Pollution Control Agency. . .