What additional equipment might be optional during core sampling?

The option referring to an ice chest is relevant in the context of core sampling because it can be used to preserve the integrity of the core samples after they are extracted. Core samples can be affected by temperature changes, and maintaining a controlled environment helps prevent degradation or alteration of the material before testing. Utilizing an ice chest ensures that the samples remain at a stable temperature, which is crucial for accurate analysis in subsequent laboratory testing.

The other choices are helpful for the sampling process but are generally regarded as fundamental equipment or tools that one would typically have on hand. A hammer is used for driving the sampling tool into the pavement, a measuring tape is essential for ensuring that samples are taken to the correct depth, and a scraper may be used to prepare the sample site or clean the equipment. However, the use of an ice chest specifically addresses the critical consideration of sample preservation, thereby making it a particularly significant optional piece of equipment in this context.