I saw this weekend the fire service also fixed the coal road in bass river. They also have mounds of dirt left over.
I'm pretty sure that was the State Park Service maintenance people at Bass River SF, not fire service. They did several roads around Bass River SF: "Dump Rd", Dan's Bridge Rd, and the latest was Coal Rd. Whatever is left over will be used somewhere else.
When I was on Batona recently and came to Coal Rd, there was a tall, soft dirt pile right across the trail. I took a picture and asked if this was intentional - to block motor vehicles, or a joke, or just careless. Apparently they weren't done yet and maybe didn't realize that was the trail. I hope it's gone now. If it's still there next time I'm using my shovel and cutting a path through it.