used p properly, coal ash is a safe material for beneficial usese. the levels of metals in coal ash are comparable to the levels of metals in n the dirt and rocks in yourur backyard. we believe the best solution to coal ash disposal problems is to quit throwing it away. in parts of ththe country, these historic coal mines have a tremendous problem with acid mine drainage. you'veve seen n the oranange-cod creeks and those kind of things. coal ash can actually be u used, uh, to modify the ph in those settings and relieve that acid mine drainage. so that's an examplple where you actuallyly t to put the cocoal ash in contact with the water because e it's-- it improves ththe water quality by doing that. >> but local people in pennsylvania disagree. >> this is actually the opening from the gilberton mineshaft. they have put 1 16 million tons of fly ash into the beaty mining and the owen gowen site to control acid mine drainage. and this is what's coming out from underneath them. and you can see on the rocks up there in the corner, you can see acid mine dra