Human remains have been discovered in various spots around Lower Manhattan New York (CNN) -- New York City officials will begin sifting through soil for human remains Tuesday at a site where a part believed to be from one of the 9/11 airliners was found. A Boeing Company technician confirmed that the piece, discovered last week, is a support structure from a trailing edge flap found on the wing of a Boeing 767 like the ones that were flown into the World Trade Center on September 11, 2001. 9/11 victims remembered 9-11 memorial 16 9-11 memorial 13 9-11 memorial 14 9-11 memorial 15 The plane part is about 5 feet long, 4 feet wide and 17 inches deep, police Commissioner Ray Kelly said. Family members upset Waiting for a match In the past few weeks, the Office of the Chief Medical Examiner has been sifting through 590 cubic yards of construction debris from around the World Trade Center collected as recently as 2011. Close to 100 pieces of potential human remains have been found since the new sifting operation began. The medical examiner will now try to identify these remains using DNA. About 60% of the more than 2,700 victims have had remains identified. Some victim's family members are hopeful that this new pile of construction debris will contain the match they still wait for. It'll be difficult. All the emotions, all the thoughts come rushing back to you. It would be a relief to know that these sacred remains are no longer sitting in a landfill somewhere," said Michael Burke who lost his brother, Fire Department Captain William Burke Jr. Yet not all family members are anxiously waiting for the phone to ring. "I really didn't want to find anything out, anything after a certain point in time because it would only be rehashing things all over again," said Paulette Hasson, who lost her son Joseph, an employee of the firm Cantor Fitzgerald. He's in a good place I'm sure and some day I'll see him, and I just feel like this is not something that I want to deal with right now. I don't feel that it will do anything for me if they find a bone fragment. The total number of victims whose remains have been identified stands at 1,635, according to the Medical Examiner's office. CNN's Chelsea J. Carter, Rob Frehse, Chris Kokenes, Mary Snow and Steve Kastenbaum contributed to this report.