Final answer:
The minimum level at which the aggregates being tested are expected to comply is referred to as primary standards. Secondary standards are set to prevent environmental and property damage.
Step-by-step explanation:
The minimum level at which the aggregates being tested are expected to comply is referred to as the primary standard. These standards are a set of limits based on human health and are intended to ensure the safety of individuals. For example, in air pollution control, primary standards define the maximum allowable concentration of pollutants in the air to protect public health.
Secondary standards, on the other hand, are limits set to prevent environmental and property damage. These standards are additional measures taken to protect the environment and prevent harm to ecosystems. For instance, secondary standards for air pollution may be set to safeguard vegetation, animals, and buildings.