Land disposal by hazardous waste regulation includes:

Land disposal by hazardous waste regulations specifically encompasses methods that involve the physical placement of waste materials within the land, whether in landfills or other types of containment systems. Waste piles, as indicated in the correct choice, refer to the accumulation of hazardous waste that is stored on the surface of the land. These piles can ultimately lead to leaching and contamination if not managed properly, thus they are regulated under hazardous waste laws.

To elaborate on why waste piles are included under land disposal: they often need to be managed in a way that controls the potential for hazardous materials to migrate into the surrounding environment, which is a key concern in hazardous waste management. Regulations are in place to ensure that waste piles are monitored and maintained to minimize risks to health and the ecosystem.

In contrast, incineration is a thermal treatment method that involves burning waste at high temperatures, thereby not falling under the category of land disposal. Sewer disposal typically refers to the discharge of waste into sewage systems, which also does not align with land disposal as it is aimed at treatment rather than containment on land. Fuel blending involves mixing hazardous waste with other materials for energy recovery, which again is a process distinct from land disposal methods as it deals with converting waste into fuel rather than disposing of it on