The volunteers are expected to work along Appletree Ridge on Commission Road in the Wollemi National Park between the California and the old Bulga trails.

This means residents will witness an increase in smoke.

Water-bombing aircraft is working on the Spring Gully blaze, east of Martindale, too.

Meanwhile, the NSW RFS has provided an update on bushfires near Bulga, Martindale and Baerami.

"The planned back-burning operation behind properties on The Inlet Road and Wambo Road was postponed at the weekend until further notice," a spokesperson said.

"The recent rainfall has extinguished the majority of the ridge top back burn that was conducted earlier in the week.

"However, there are still some hot spots in the area.

"The Kerrys Ridge bushfire is travelling in a northerly direction in the Wollemi National Park.

"Crews are attacking the fire as is comes down from the ridge top into the open valley system.

"Three new ignitions were detected from the storms that passed through the area on Wednesday.

"As for Bareami Creek Road, on the ridge to the east of Baerami Creek, remote area firefighters are working on this.

"Containment options for Spring Gully are being explored as well."

The NSW RFS - Hunter Valley team would also like to thank residents for their continued generosity to local brigades over recent weeks.

Goods have been donated to crews throughout the region, while a number of fundraisers are being planned.