The debris field is about a square mile and 30 to 40 feet deep in places, with a surface that includes quicksand-like muck, rain-slickened mud and ice. The terrain is difficult to navigate on foot and makes it treacherous or impossible to bring in heavy equipment.
To make matters worse, the pile is laced with other hazards that include fallen trees, propane and septic tanks, twisted vehicles and countless shards of shattered homes.
The knowledge that some victims could be abandoned to the earth is difficult to accept.
"We have to get on with our lives at some point," Bach said.
Bach spoke via phone about a wedding the family had planned for summer at the rural home that was destroyed. And how, she wondered, do you plan a funeral without a body? "We'll probably just have a memorial, and if they find the bodies eventually, then we'll deal with that then."
A death certificate, issued by the state, is legal proof that someone has died. Families often need them to settle their affairs. The authority to issue them starts with a county medical examiner or coroner, said Donn Moyer, spokesman for the Washington State Department of Health. If and when it appears there is no chance of finding someone, people can ask the county to start that process.
Two Washington National Guard Blackhawk helicopters arrived at the site Wednesday to relieve sheriff's helicopter crews that had been working since Saturday.
The Blackhawks' sole mission is body removal, said Bill Quistorf, chief pilot for the Snohomish County Sheriff's Office.
Other survivors began to grow impatient Wednesday that they weren't allowed to return to the sites of their homes to search for their valuables and keepsakes.
"This isn't right. All of us who are still alive need to have access and find what we can of our lives," said Robin Youngblood, who said her son-in-law was turned away from the slide site.
Baumann reported from Seattle. Associated Press writers Phuong Le and Matt Volz in Seattle; P. Solomon Banda in Darrington, Wash.; and photographer Elaine Thompson in Oso, Wash.; and researcher Rhonda Shafner contributed to this report.