Debris cleanup was underway for properties in the burned areas of the Palisades and Eaton fires, and officials were preparing for potential mudslides and debris flows with incoming rain set to hit Los Angeles County over the weekend, authorities said Wednesday.

K-rails and sandbags were being deployed in both areas to divert those potential debris flows during rainfall, which was anticipated from Saturday to Monday, said Mark Pastrella, director of Los Angeles County Public Works.

National Weather Service meteorologists forecast light rainfall that probably won’t cause debris flows or mudslides.

The county has partnered with the Federal Emergency Management Agency to begin debris removal. The first phase, which is underway, focuses on household hazardous items, while in the second the U.S. Army Corps of Engineers will handle any other fire-related hazardous materials.

Private property owners would need to opt in to have the Army Corps of Engineers conduct debris removal from their properties, said Kathryn Barger, chairwoman of the Los Angeles County Board of Supervisors.

“It is incredibly important that we get widespread participation,” Barger said. “We need private property owners to sign up for this program to maximize the benefits offered so they can move through the process swiftly and efficiently.”

The supervisor also said a portal was set up for people who want to help those affected by the fires: lacounty.gov/relief.

Crews are also clearing sediment and debris from flood-control dams and debris basins, the cost of which Public Works spokeswoman Lisette Guzman said is expected to exceed $100 million for the county agency.

There are 21 county debris basins in the Eaton fire burn area and two debris basins in the Palisades fire burn area that will intercept mud and debris flows from mountain watersheds, Guzman said. There are similar basins throughout the Palisades fire area that are maintained by the city of Los Angeles or are privately owned.

Firefighters continued pushing toward extinguishing the Eaton fire, which has caused destruction in Altadena, Pasadena and Sierra Madre, and the Palisades fire, which slammed Pacific Palisades, Malibu and Topanga and Mandeville canyons. Firefighters have had to deal with winds and low humidity.

The Eaton fire was 95% contained as of Wednesday, up from 89% on Tuesday. Crews upped containment of the Palisades fire to 70%, up from 65%. Containment is the percentage of the blaze’s perimeter blocked off by firefighters’ work or natural barriers such as the ocean or rocks.

A red flag warning, meaning weather conditions are such as to help fires, is in place for much of Los Angeles County until 10 a.m. on Friday.

The fires have combined to claim 28 lives and damaged or destroyed more than 17,000 structures, according to estimates from Cal Fire and the Angeles National Forest. The causes of the fires were under investigation.

Mandatory evacuations were affecting thousands of residents who still have homes, and a curfew from 6 p.m. to 6 a.m. remained in effect for those swaths, Los Angeles County Sheriff Robert Luna said.

The sheriff said 59 arrests have been made for looting, burglary, curfew violations, impersonating first responders and drone violations since the fires broke out. The department was also investigating 22 active missing- persons cases.

President Donald Trump is scheduled to visit Southern California on Friday, The Associated Press has reported.