The sampleId on a CoCRecord is the label you wrote on the sample bottle and recorded on the paper CoC form — for example, "MW-05-S1" for a first sample from monitoring well 5. The laboratory uses this ID to log your sample into their system and reports results back referencing it. In Piper, sampleId is the cross-reference that lets you confirm a lab result is for the correct well and event. It must match the bottle label exactly to avoid result attribution errors.
Technical section
Data model, API, and internals — visible to developers.