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DARRINGTON, Wash. (CBS NEWS) -- Crews searching through the muck and devastation wrought by Washington's deadly mudslide are finding more human remains on the east side of the slide, near the town of Darrington.

Steve Harris, a division supervisor for the search effort, said Monday that search teams are learning more about the force of the March 22 slide, and that is helping them better locate victims in a debris field that is 70 feet deep in places.

"There's a tremendous amount of force and energy behind this," Harris said of the slide. He didn't provide further details.

Harris said search dogs are the primary tool for finding remains in the small, mountainside community about 55 miles northeast of Seattle. He said searchers are finding human remains four to six times per day.

The number of confirmed dead went up from 21 to 24 on Monday, with two dozen more still missing. The death toll is slowly increasing each day, as the medical examiner identifies more fatalities.

"It's very difficult to make identifications in some of the finds," he said.

A makeshift road completed over the weekend links one side of the 300-acre debris field to the other.

Searchers have had to contend with treacherous conditions, including household chemicals, septic tanks, gasoline and propane containers. When rescuers and dogs leave the site, they are hosed off by hazardous materials crews.

Gov. Jay Inslee on Monday asked President Barack Obama for a major disaster declaration in Snohomish County to make programs available to help individuals, households and businesses.

Last week, a federal emergency declaration was approved that provided a federal disaster team and specialized personnel to the slide area.

Also Monday, members of the Seattle Seahawks football team and Seattle Sounders soccer team were scheduled to visit with community members in the evening.

On Sunday, Inslee said rescue workers looking for victims are hoping for a miracle at this point in the rescue process but will continue to look for survivors as long as there is hope.

"Look, we are hoping for a miracle. And more importantly, we are working for a miracle. And we're doing everything humanly possible if that opportunity exists,"Inslee said on CBS' "Face the Nation." "These searchers, both professionals and volunteer, are really performing Herculean tasks right now. They're working beyond the point of exhaustion. And we intend to exhaust every possible avenue to look for that miracle.

© 2014 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.

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