What Snake eyes said,
lots of lumber up in the northern part of california. Also, marijauana growers in that area.
There is also the Sierra Military Depot on the north east end of the state. If I recall, they dispose of chemical weapons?
I wasn't aware of an active nuclear power plant up in that part of the state. There was the Humboldt Bay nuclear power plant, but that was closed in the 70's I beleive.
There's a geothermal plant a little south of the area you're describing called Geysers Geothermal plant.
also up that aways is Mt. Shasta, a dormant volcano.
not that I want to sound like a shill, but you can also check out this order of battle:
http://www.reocities.com/orrin_ladd/cali1.htm