Families whose children were among those diagnosed with brain tumors, leukemia, lymphoma and other forms of cancer said they were troubled by the report.
"Obviously it is upsetting to learn that such significant amounts of poison sludge are dumped anywhere, but to either dump it in proximity or cover it over with a children's park and a swimming pool filled with water coming from the very spot where the dumping occurred, is an outrage," said Alan Mortensen, an attorney working with some of the families.
Investigators over the past years have been focusing on a 12-mile-wide circle of mostly farmland just south of Lake Erie.
Many of the diagnoses came between 2002 and 2006, leading state health authorities to declare it a cancer cluster because the number and type of diagnoses exceeded what would be expected.
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