Which of the following is an unacceptable operating practice at a sanitary landfill?

Designating a specific time and place for the dumping of sewage sludge, agricultural wastes, and toxic substances at a sanitary landfill is considered unacceptable as it may lead to environmental and public health risks. Proper landfill operations require careful management of waste types to prevent contamination of the surrounding environment and to ensure compliance with regulations. The random or unregulated disposal of harmful substances can contaminate soil and groundwater, pose hazards to workers and nearby communities, and violate environmental protection laws.

In contrast, covering exposed refuse daily with a layer of soil helps to control odors, pests, and the potential for blowing litter, which is a standard practice to maintain sanitary conditions. Compacting refuse as it is brought in maximizes the use of space, prevents settlement, and diminishes the risk of fires or pest infestations. Having sufficient stand-by equipment ensures operational continuity and allows for prompt responses to equipment failures, which is crucial for effective landfill management and safety. These practices contribute to the overall safety and efficiency of landfill operations, making them acceptable within the industry standards.