Core Samples

Spotted this on the way in to work. They’re working on fixing up the street near our house, and this section appears to be… core samples? Tests? Not really sure, but it looked like some kind of test or QA thing.

If these are testing sample, why are they so close to one another? And why are they marked in pairs? So many questions.

Related:
32 Needles: Allergy Tests at Northwestern
Roadwork Begins

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