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LAKEWOOD, Colo. -- People who live on Green Mountain should be on the lookout. The Colorado Department of Public Health and Environment wants to make sure you're not sitting on old military ordinance.

Green Mountain was the site for Army artillery practice starting in World War I. After nearly 100 years, a final cleanup will get under way this summer. The health department is alerting everyone that it will be coming around this summer, to make sure the area is clear of those shells.

Green Mountain is a popular cycling and hiking area for recreation in west Lakewood, with housing developments on the north face. But beginning during World War I, it was also used by the Army for artillery target practice.

"We would hear stories about them finding, you know, shell casings and pieces of metal that weren't supposed to be there," Michael O'Rourke said.

O'Rourke grew up on Green Mountain and said he hasn't heard those stories in 20 years.

"I've been hiking it for 23 years since I've lived over there and been all over the north side of Green Mountain, never seen any metal or any indication that it's there," Patrick Smith said.

Smith came to an informational meeting for residents to understand what the health department plans to do this summer.

"To come and take a quick survey of open areas in their property just to determine if there is any munitions debris or even unexploded ordinance," said Warren Smith, from the Colorado Department of Public Health and Environment.

Over the years, these pieces of military ordinance were dug up from the mountain. The health department just wants to make sure it hasn't missed some.

"My feeling is that it's minimal, but if there's a danger, I'd like to see it," Walt Colligan said.

Colligan and his wife Nancy live in the neighborhood and hike the mountain everyday. They say they're not worried about their property values.

"Being next to a place where you hike and bike -- it increases property values," Walt Colligan said.

"And they seem to be taking care of the issue," Nancy Colligan added.

There will be another meeting at Red Rocks Community College. Residents who live on Green Mountain will also be getting notices in the mail about health department surveys.

In the meantime, if you spot something, officials said don't touch it but instead call 911.