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Tests Show Food Additive Was in Lake

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The National Park Service has lifted the swimming advisory for all beach areas at Indiana Dunes National Lakeshore that was in place following an oily looking substance that was sticking to swimmers Monday afternoon at Porter Beach. Officials say water samples ruled out an oil spill and further laboratory analysis indicated the presence of a food additive, tricalcium orthophosphate, an anti-caking agent. The Indiana Dunes National Lakeshore also says an increased amount of natural products, including algae and mica particles, were also found to be in the water. Lab tests conducted by both the U-S Geological Survey and Indiana Department of Environmental Management determined that the substances found in the water did not pose a health threat to swimmers. The United States Coast Guard used a helicopter and estimated it to be approximately 1/8 of a mile in length and being moved by lake currents to the east from Porter Beach towards the Indiana Dunes State Park and the eastern portions of the National Lakeshore.
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