Mop-up work is underway on a fire that burned 95 acres outside of Tygh Valley late Thursday afternoon.  David Jacobs of the Oregon Department of Forestry The Dalles Unit says crews got a line around the fire late last night, assisted by air drops, and it is 100 percent contained.  Much of the fire burned in grass, but about 20 to 30 acres was in scrub oak and brush, and Jacobs says that is where the mop-up work is taking place.  There were eight engines with a 20-person crew on the scene to do the mop-up work.  Jacobs says the fire was human-caused, but did not elaborate further.  ODF, Bureau of Land Management, U.S. Forest Service, Wamic, Tygh Valley, and Juniper Flat crews took part in the firefighting effort.