Rardin Brothers Coal Company operation, unplantable area. The material between 5 and 5-a coal is very toxic--full of sulfuric acid. Basin type of grading to keep surface water from polluting streams below. Where areas are unplantable, it is the policy of the Reclamation Division to spend more effort on obtaining a good grading job. Scale: P.H. Struthers. Photo by O.D. Diller. Item #5636