HAMMOND, Ind. (AP) — Officials in a northwestern Indiana city plan more testing in and around a lake where at least 30 swans have been found dead since late September.

The (Northwest Indiana) Times reports officials plan more tests around a former Federated Metals facility and will collect water and sediment samples from nearby George Lake.

The Hammond Department of Environmental Management released a second round of soil sample results Tuesday during a public meeting showing lead contamination levels trending upward along a bike path near the lake. The results, however, are around or below a federal cleanup threshold.

Whiting Metals currently operates at the site of the former Federated Metals, which did smelting and recycling there. Officials including representatives from Whiting Metals suspect a cap on a Federated Metals landfill is likely failing.