IEPA notified 74 quarries permitted to state clean C&D debris out of 92 of violations, the report says. The report says the sites are reclaimed quarries that accept concrete, brick, asphalt and uncontaminated soil.
Environmentalists and officials are using the results to seek a requirement for groundwater monitoring around the sites. The report says rock quarries often sit on top of groundwater supplies, and advocates for the requirement say that any toxic materials in the quarries could affect an aquifer.
IEPA spokeswoman Kim Biggs says in the report that IEPA regulators are meeting with representatives from each impacted site to mitigate the issue. She says in the report that what will happen will vary site by site, but could include more sampling, confirmation testing or soil removal.
IEPA tested deposits from the 92 sites in April and May for 190 heavy metals, volatile and semi-volatile organic compounds. The samples showed levels exceeding regulation for aluminum, iron, selenium, chromium and manganese. The report says high levels or arsenic were found in six cases and mercury in three. Several cases had one or more of seven semi-volatile organic compounds, all but one a known or suspected carcinogen.