During a site assessment, what kind of evidence should be looked for to indicate a release?

The correct choice highlights the importance of visual and olfactory indicators during a site assessment for potential releases of heating oil or other hazardous materials. Visual indicators might include signs of staining on soil or pavement, pooling liquids, or damages to nearby vegetation, all of which can suggest that a release has occurred. Olfactory indicators are just as critical; unusual smells, especially petroleum odors, can indicate the presence of a leak. These sensory observations provide immediate and tangible evidence of potential contamination and can guide further investigative actions.

While other options could provide information about a site, they do not directly serve as evidence of a release. Documentation of previous permits, for example, may convey regulatory compliance or historical use of the property but does not indicate actual environmental conditions. Soil samples, although necessary for confirming the presence of contaminants, would be a step taken after initial indicators are observed. The presence of construction equipment may suggest recent activity but does not inherently indicate a release has occurred. Therefore, focusing on visual and olfactory indicators is crucial for the timely identification of potential environmental hazards during site assessments.