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Deputy Commissioner Rogers said local crews would focus on"tying the fire"into some areas that had previously undergone hazard reduction.
"We have good confidence that will help us contain that fire,"he said.
Deputy Commissioner Rogers said crews had a lot more work to do since the Ruined Castle fire joined the Green Wattle Creek fire,where the Premier visited on Sunday.
"There is a lot of fire in the area,and a lot more work to do ... I think it is fair to say the next few days are going to be very important to get those burns in place,"he said."There won't be so much of a risk as we go into that next batch of weather."
Deputy Commissioner Rogers said it was estimated about 100 homes had been lost over the weekend.
"More than 3 million hectares have burnt. It is an enormous amount of the landscape and the forested areas,"he said."You will see bigger fire seasons in the'70s but that was when there was a lot of grassland out in the west of the state."
He said the scale of the damage to forested areas would be felt"for years to come".
"We shouldn't underestimate how much of the natural environment has been burnt and that has got serious ecological impacts as well as the fire impact as well,"he said.
Ms Berejiklian said she had been reminded about the importance of hazard reduction,recalling when Greater Sydney was shrouded in smoke six months ago because of hazard reduction operations.
"I remember many of us complaining about the smoke ... but thank goodness that occurred because it really protected[property]."
Asked how the government was responding to reports of RFS volunteers in financial stress due to long periods spent away from employment on the fireground,she said it was in constant liaison with the RFS and Commissioner Shane Fitzsimmons to ensure adequate support was provided.
She added that crews across the state were also being supported by Australian Defence Force personnel,both on the firegrounds and at RFS headquarters in Sydney.
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"We provide the RFS with all the resources they need,"she said."We have always said to the Commissioner and Deputy Commissioner if there is more we need to do,we will."
Deputy Commissioner Rogers added that firefighters had to prioritise what they are doing.
"Each individual person has their own story to tell,it is very hard to say firefighters in general because everybody is in a different situation,"he said.
"We try and rotate the firefighters so they can keep balancing their work,their home."
There are 150 to 200 defence force personnel assisting with the fire effort,in addition to support from overseas and interstate firefighting counterparts.
On Monday,NSW entered its fifth day in a week-long state of emergency,declared by the Premier last week.
Monday's fire danger rating is high in 10 regions,including the Far West,New England,the Illawarra/Shoalhaven and the far South Coast.
Fire danger is considered very high in the ACT,Monaro Alpine,Southern Slopes,Northern Slopes and Southern Ranges regions.