PORTAGE — The National Park Service has closed a third beach area — Cowles Bog Beach — at the Indiana Dunes National Lakeshore until further notice due to the recent discovery of a toxic spill from U.S. Steel into the Burns Waterway, the park service announced Wednesday afternoon.
"This additional beach closure is based on a recommendation that all beaches within three miles of the discharge be closed as a precaution to protect the health of park visitors," NPS said in the release.
U.S. Steel said an equipment failure Tuesday at its Midwest Plant resulted in a chemical leak into the waterway that forced the shutdown of a drinking water intake along Lake Michigan and several nearby beaches.
The U.S. Environmental Protection Agency is leading the investigation into the spill of hexavalent chromium, a toxic byproduct of industrial processes, into the waterway, which is within 100 yards of Lake Michigan, officials said.
The spill forced the closure Tuesday of Indiana American Water's intake in Ogden Dunes and several beaches, including West Beach and Portage Lakefront and Riverwalk at Indiana Dunes National Lakeshore and Ogden Dunes' town beach. On Wednesday, NPS announced the closure of Cowles Bog Beach.
Ogden Dunes officials said the town's drinking water is currently coming from Indiana American's plant in Gary. EPA said the water intake at Ogden Dunes was shut down "out of an abundance of caution."
U.S. Steel reported the release of wastewater Tuesday from the Tin and Tin Free electroplating process, the company said.
"The wastewater is from the process used to treat the steel strip after electroplating, and the rinse water from this process is conveyed via pipe to a dedicated treatment plant," U.S. Steel said in a statement. "The preliminary investigation revealed that an expansion joint in the rinse water pipe failed and resulted in the water being released to a different wastewater treatment plant and ultimately Burns Waterway through an outfall."
U.S. Steel said it notified several other agencies and shut down all of its production processes.
"Additional steps to mitigate the impact are being taken," U.S. Steel said. "These steps include the isolation and repair of the damaged pipe, recovery of material, and the addition of a water treatment compound, sodium trithiocarbonate (CNa2S3), to the waste water treatment plant to convert and aid in the removal of hexavalent chromium."
The company said it would continue to work with local, state and federal agencies to resolve the problem.
Ogden Dunes Town Council President Tim Nelson said town officials are monitoring the situation and awaiting additional information.
"We are gathering information right now. It is too early to tell if there is an impact on the town," Nelson said.
Save the Dunes warned "people and pets should avoid direct contact with Lake Michigan" until further notice. A fish killed is expected to be the result, the nonprofit environmental group said.
Hexavalent chromium is the same "carcinogenic chemical that appeared in the 2000 biographical film, 'Erin Brockovich,'" Save the Dunes said. It can cause reversible and irreversible skin lesions on direct contact, the group said.
According to the Occupational Safety and Health Administration, direct skin contact with hexavalent chromium can cause a nonallergic skin irritation. Contact with non-intact skin also can lead to chrome ulcers. These are small crusted skin sores with a rounded border. They heal slowly and leave scars.
Save the Dunes said Lake Michigan is a primary source of drinking water for many residents of Lake, Porter and LaPorte counties.
The Indiana Department of Environmental Management was notified of the wastewater discharge, but EPA is the lead agency, an IDEM spokesman said.
EPA said Tuesday night it was monitoring Burns Waterway and Lake Michigan and that sampling showed the chemical was not detected in the lake. EPA said it would continue to monitor and provide updates "as needed." The agency had not provided any further updates as of 1 p.m. Wednesday. No activity related to a cleanup could be observed along the waterway Wednesday morning.
Check back at nwi.com for updates to this story.
Times staff writer Joyce Russell contributed to this report.
UPDATE: EPA: Chemical spill originated at U.S. Steel, residents should steer clear of beaches