SOMERSET COUNTY, Pennsylvania (CNN) -- A chain link fence now stands between Tim Lambert's land and the impact site of United Airlines Flight 93, which crashed here on September 11, 2001. The property has been in Lambert's family for almost 80 years.



A temporary memorial has been set up to honor the victims of the United Airlines Flight 93 crash.



"My grandfather purchased about 200 acres in the 1930s, and he would cut timber and sell the timber off, and he would build cabins as well," Lambert says. "That's how he got the family through the Depression."



Lambert says he had no plans for the land, he just knew he wanted to hold on to it. "There's a lot of natural resources in this area -- natural gas, coal," he says.



That all changed the day 40 passengers and crew died trying to take control of a Boeing 757 that had been hijacked by four terrorists as it took off from Newark, New Jersey, bound for San Francisco, California. It is believed the hijackers had intended crash the plane into the White House or the U.S. Capitol.



Plans for a permanent memorial have been in the works for years. Congress passed a law in 2002 instructing the National Park Service to establish a national memorial where the crash occurred. Part of it would be on Lambert's land.



In the seven years since, some of the most important land needed for the massive project has remained in limbo, producing an emotional debate among landowners, family members and the National Park Service. See plans for the proposed Flight 93 Memorial



At the center of the dispute is the government's plan to take the remaining land needed by using its power of eminent domain. The government can seize privately owned property to convert it to public use after paying the owner fair market value.



Lambert's land is key to the project. He owns 6 acres that are just feet from the crash site. He has yet to reach an agreement with the government to buy his land.



"Eminent domain was sort of dropped on us at the last second here," he says, "and it feels like we never even had a chance to talk about some of the issues that we needed to address during the negotiations."



Lambert still finds debris from the plane on his land.



"Red and blue wire all over the place," he says as he bends over to pick up a piece. "Here it is almost eight years later."



The National Park Service says time is running out if the memorial is to be ready by September 11, 2011, the 10-year anniversary of the terrorist attacks. It says it has to use eminent domain for 166 essential acres that it has been unable to purchase.



"We've held off using it until we've got here, really at the very last stage of this where we have no other choice," says National Park Service associate director Steve Whitesell.



The amount of land needed for the memorial is just over 2,200 acres, about 1,400 of which  is near the crash site, where there will be a visitor center. The other 800 acres would create a buffer around the site to protect the rural setting.



That is where Randy and Linda Musser live -- on more than 100 acres of land, 62 of  them within the memorial park boundaries. The Mussers enjoy hunting, fishing and horseback riding on their land, which is about three-quarters-of-a-mile from the crash site.



"This eminent domain cloud hangs over this whole piece of property now," Randy Musser says, standing by a pond where he likes to fish. He was a member of a committee formed with Flight 93 family members to establish the boundaries of the park.



"If I knew the National Park Service was going to be able to use eminent domain to acquire property within the park boundary, I would had fought that at the time the park boundary was established to keep as much property out of the park as possible," Musser says.
Where the Hijacked United Flight 93 crashed? Where did Flight 93 crash? What type of debate is expected? What needs to start construction soon? When did the crash take place?
Pennsylvania Pennsylvania emotional a national memorial where the crash occurred. September 11, 2001.
question: Where the Hijacked United Flight 93 crashed?, answer: Pennsylvania | question: Where did Flight 93 crash?, answer: Pennsylvania | question: What type of debate is expected?, answer: emotional | question: What needs to start construction soon?, answer: a national memorial where the crash occurred. | question: When did the crash take place?, answer: September 11, 2001.