what congress did in terms of diesel fuels was that congress was focused on benefit zin toluene and xylene or b-tex come pounds, associated with all six of those cas numbers, so we're doing our best to interpret what congress was concerned about in sources of drinking water, potential risks there. and that's our proposed description of diesel fuels. and, again, it is out for public comment. >> will this be retroactive to permitting when the new definition is done? >> the permitting requirements of the statute and the regulations apply now, but the diesel fuel definitions and proposed interpretation of those would, of course, not be. >> so if a state doesn't abide by the guidelines, will they lose primacy in this? >> we don't intend to take away primacies from our state partners. we are working with them in a complimentary way and don't intend to do that. the draft guidance applies only to those states where epa is the permitting authority under the uic program. >> would this be in the blm area? >> it doesn't apply -- it doesn't differentiate between private lands and federal land, but it d