FICTIONAL H2S RECORD-REVIEW EXAMPLE

This data pack accompanies the W03 guide. All instruments, timestamps and values are fictional. It contains no real worker information and is not a manufacturer export.

Start with these four case files:
1. metadata.json defines the units, timestamps, measurement intervals and missing values.
2. measurements.csv lists twenty one-minute intervals. Two have no measurement value.
3. events.csv records one alarm event, its peak and its alarm duration.
4. summary.json reports a TWA of 0.030 ppm with deliberately unspecified calculation details. This value was selected for the exercise; it was not calculated from measurements.csv.

Timestamps use Coordinated Universal Time (UTC). A numeric measurement is the mean for the entire interval from its start up to, but not including, its end. An empty numeric cell marked missing has no supplied measurement. Do not replace it with zero.

The eighteen valid one-minute means sum to 1.500 ppm.min. Dividing by 18 minutes gives a covered-interval mean of 0.083333... ppm. This does not establish the complete 20-minute average or a reference-period exposure result. The files do not establish compliance or permission to work. Do not invent missing concentrations or draw a continuous curve across the gap.

Supporting files:
- findings.json separates what is known, unknown and needed next.
- calculation.json records the covered-interval arithmetic and leaves unsupported results empty.
- review-worksheet.csv provides fields for reviewing your own records.
- complete-arithmetic-example.csv is a SEPARATE example: 480 valid one-minute means, one at 12 ppm and 479 at zero. Its eight-hour mean is 0.025 ppm. It does not fill gaps in the 20-minute case or define an instrument algorithm.

Use the actual model, firmware and software documentation when reviewing real records.
