The federal government is using the asphalt sludge as a sealant to help control leaks in an area that has been badly damaged by heavy rains, which caused flash flooding and mudslides in Houston and other Texas cities.
The U.S. Department of the Interior and the Environmental Protection Agency are spending about $500 million a year to install the slurry.
The agency has awarded about $250 million to companies and communities to install asphalt sludges for areas that were damaged by floods, and $250,000 to a company that is using slurry to protect a section of the Texas coast.
It is a complicated process to seal sludge, with multiple companies working to meet environmental standards and meet the needs of the public.
A sealant is typically used to protect the bottom of the sludge so it will not float away from the bottom.
It also allows the sludged material to stay in place while being sprayed, so the slush doesn’t run away.
But it is not clear if this sealant works as well as the original sludge.
In the flood-damaged areas of Houston and elsewhere, a thick, oily layer of oil and sludge is the main sealant.
So far, the EPA has been able to seal the oil, and other types of sludge that could float, by coating the top of the oil with polyethylene and applying a thin layer of a protective coat called polyvinyl chloride (PVC).
That is not what is being used for the sealant on this section of asphalt.
The EPA said the oil and other sludge can’t be stored in the environment and needs to be stored somewhere.
But the agency has said the sealants it is installing will help seal the asphalt and prevent the oil from escaping.
The city of Houston is currently working with a company to install a seal to seal a section, and is also working with the U.N. agency for the World Bank to seal an area in Haiti that is badly damaged from heavy rains.