ALEXANDRIA TOWNSHIP, N.J. - New Jersey police say a woman fell off a catwalk and plunged to her death at a Superfund site.

MyCentralJersey.com reports authorities responded to the Crown Vantage Landfill Superfund site in Alexandria Township on Friday night.

State police say the 20-year-old woman was with several of her friends when she fell off the catwalk near a smokestack. She was declared dead at the scene.

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The landfill is located near the Delaware River. It had been used by a paper mill to dump hazardous waste from the 1930s to the 1970s.

On its website, the Environmental Protection Agency, which is cleaning up the site, warns against trespassers at the site.

“The risks posed by the site are addressed through a forested cover that prevents humans and ecological receptors from being exposed to landfill materials,” according to the website. “In addition, to keep trespassers from entering the site, the landfill is fenced with and posted warning signs, and there is security surveillance.”