Contaminated audit samples (percent)
Provisional. Usable pending approval; a project-proposed concept only by the project that proposed it.
Definition
Bags or containers opened in contamination audits in the reporting period in which material of any stream other than the audited stream was found, divided by all bags or containers of that stream opened, as a percentage. A sample with no other stream found is clean. The share of audits in which every sample is clean, and the number of samples, are reported alongside. Kind rate.
purpose
To measure how clean each separated stream arrives, which offtakers’ specifications and the applicability of recycling methodologies depend on.
rationale
A container rating at the household is a visual judgement; opening sampled bags at the facility and recording the streams found gives an independent, repeatable contamination measure for the same streams.
Classification
- Result level: Outcome
- Outcome domains: Resource recovery, Separation behaviour
- Unit of observation: Audit sample
- Activity types: Contamination audit
- Approval status: Provisional
- Unit of measure:
PERCENT
Collections
- Separation and containers module